new latex package silence (24feb09)

git-svn-id: svn://tug.org/texlive/trunk@12234 c570f23f-e606-0410-a88d-b1316a301751

7 files changed, 2555 insertions, 1 deletions

diff --git a/Master/texmf-dist/doc/latex/silence/README b/Master/texmf-dist/doc/latex/silence/README
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+This is the file README for silence.sty.  You'll find complete documentation in silence-doc.pdf.
+
+This package allows you to filter out error messages and warnings sent by LaTeX,
+packages and classes.
+
+
+To produce the documentation: run LaTeX on silence-doc.dtx.
+To produce the .sty file: run LaTeX on silence.ins.
+
+
+Licensing of this package is covered by LPPL.
+
+Any reaction is welcome: zappathustra@free.fr
+
+Paul Isambert
diff --git a/Master/texmf-dist/doc/latex/silence/silence-doc.pdf b/Master/texmf-dist/doc/latex/silence/silence-doc.pdf
new file mode 100644
index 00000000000..98bc5163c99
--- /dev/null
+++ b/Master/texmf-dist/doc/latex/silence/silence-doc.pdf
diff --git a/Master/texmf-dist/source/latex/silence/silence-doc.dtx b/Master/texmf-dist/source/latex/silence/silence-doc.dtx
new file mode 100644
index 00000000000..2d8dcaa5cb6
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+++ b/Master/texmf-dist/source/latex/silence/silence-doc.dtx
@@ -0,0 +1,1854 @@
+% \iffalse meta-comment
+% ******************************************************************************
+% ******************************************************************************
+% **                                                                          **
+% ** silence v.1.1 by Paul Isambert                                           **
+% ** See the documentation for a comment on the implementation.               **
+% **                                                                          **
+% ** This set of macros is published under the LaTeX Project Public License:  **
+% **                                                                          **
+% ** Do whatever you want to that software,                                   **
+% ** but if you modify it, change its name to avoid confusion,                **
+% ** and if you copy part of the code please mention where it comes from.     **
+% **                                                                          **
+% ** Comments, suggestions and bugs:                                          **
+% **                                                                          **
+% ** zappathustra@free.fr                                                     **
+% **                                                                          **
+% ** http://paulisambert.free.fr/                                             **
+% **                                                                          **
+% ** Enjoy!                                                                   **
+% **                                                                          **
+% ******************************************************************************
+% ******************************************************************************
+% \fi
+
+% \iffalse
+%<package>\NeedsTeXFormat{LaTeX2e}
+%<package>\ProvidesPackage{silence}[2009/02/20 v1.1 Selective filtering of warnings and error messages]
+%<*driver>
+\documentclass[a4paper]{ltxdoc}
+\usepackage[T1]{fontenc}
+\usepackage{silence}
+\usepackage[left=5cm,textwidth=14cm,textheight=23cm]{geometry}
+\RecordChanges
+\begin{document}
+\DocInput{silence-doc.dtx}
+\end{document}
+%</driver>
+% \fi
+% 
+% \def\vbskip{\vskip.5em\noindent}
+% \WarningFilter{latex}{Marginpar on page}
+% \MakeShortVerb{"}
+% \def\vbopt#1{\noindent\llap{\textbf{#1}\enspace}\ignorespaces} 
+% \GetFileInfo{silence.sty}
+% \title{Filtering messages with "silence"\\\Large\fileversion}
+% \date{\filedate}
+% \author{Paul Isambert\\"zappathustra@free.fr"}
+%
+% \maketitle
+% \vskip1em
+% \bgroup
+% \raggedleft
+% \small
+% \textit{`Errare humanum est, perseverare diabolicum'}\\ Proverb (attributed to Seneca)
+%
+% \textit{`Marginpar on page 3 moved.'}\\\LaTeX
+%
+% \egroup
+% \vskip3em
+%
+%\begin{abstract}
+%This package is designed to filter out unwanted warnings
+%and error messages. Entire packages (including \LaTeX)
+%can be censored, but very specific messages can be
+%targeted too. \TeX's messages are left untouched.
+%\end{abstract}
+%
+% \tableofcontents
+% 
+%\section{Introduction}
+%When working with \LaTeX, messages are utterly important.
+%
+%Ok, this was the well-behaved \LaTeX\ user's offering to
+%the gods. Now, the fact is, when processing long
+%documents, repeated messages can really get boring,
+%especially when there's nothing you can do about them.
+%For instance, everybody knows the following:
+%\vbskip
+%\hfil\emph{Marginpar on page \emph{x} moved.}
+%\vbskip
+%When you encounter that message, it means that you
+%have to keep in mind for the next compilations that
+%`there is a warning that I can ignore,' which sounds
+%pretty paradoxical. When your
+%document is 5 pages long, it doesn't matter, but when
+%you're typesetting a book-length text, it's different, because
+%you can have tens of such messages. And if you're
+%hacking around, error messages might also appear
+%that you don't want to consider. This package is
+%meant to filter out those unwanted messages.
+%
+%You probably know all there is to know about
+%warnings and errors, in which case you may want
+%to skip this paragraph. If you don't, here's some
+%information. When \LaTeX\ processes your document,
+%it produces error messages and warnings, and packages
+%and the class you're using do too. Errors generally
+%refer to wrong operations such that the desired result
+%won't be attained, while warnings usually inform you
+%that there might be unexpected but benign modifications.
+%Those messages are sent to the "log" file along with
+%other bits of information. You're probably using
+%a \LaTeX-oriented text editor to create your document
+%and at the end of a compilation, it certainly gives you
+%the number of errors and warnings encountered. 
+%Hopefully, your editor also has a facility to browse
+%errors and warnings. With "silence", unwanted messages
+%won't appear anymore.
+%
+%Those messages always have one of the following structures:
+%
+%\vbskip
+%"Package" \meta{Name of the package} "Error:" \meta{message text}
+%\vbskip
+%or
+%\vbskip
+%"Class" \meta{Name of the class} "Error:" \meta{message text}
+%\vbskip
+%or
+%\vbskip
+%"LaTeX Error:" \meta{message text}
+%\vbskip
+%Replace \emph{Error} with \emph{Warning} and you have
+%warnings. The important part for "silence" is \meta{Name of the
+%package} or \meta{Name of the class}, because the information
+%is needed when filtering messages. In case of a \LaTeX\ message,
+%\meta{Name of the package} is supposed to be "latex". For filters,
+%\meta{message text} will be crucial too.
+%
+%If a message doesn't begin as above, but displays its text
+%immediately, then it has been sent by \TeX; "silence" cannot
+%filter it out, and anyway it would probably be a very bad
+%idea. For instance, there's nothing you can do about
+%something like:
+%
+%\vbskip
+%"Missing number, treated as zero."
+%\vbskip
+%and the only thing you want to do is correct your mistake.
+%
+%Another very bad idea is to forget the following:
+%\emph{"silence" does not fix anything}.
+%
+%
+%
+%\section{Usage}
+%\subsection{Calling the package}
+%
+%The package may be called as any other
+%package with:
+%
+%\vbskip
+%"\usepackage"\oarg{options}"{silence}"
+%\vbskip
+%and as any other package it will be effective only
+%after it has been called, which means that messages
+%issued before will not be filtered. So put it at the
+%very beginning of your preamble. However, if you also
+%want to catch a message issued by the class when it
+%is specified with "\documentclass", you can't say
+%
+%\vbskip
+%"\usepackage"\oarg{options}"{silence}"\\
+%\meta{filters}\\
+%"\documentclass{article}"
+%\vbskip
+%but instead
+%
+%\vbskip
+%"\RequirePackage"\oarg{options}"{silence}"\\
+%\meta{filters}\\
+%"\documentclass{article}"
+%\vbskip
+%because "\usepackage" is not allowed before
+%"\documentclass". This way, you can filter for
+%instance a warning issued by the "memoir" class
+%according to which you don't have "ifxetex", although
+%you have it...
+%
+%
+%
+%
+%\subsection{The brutal way}
+%
+%\DescribeMacro{\WarningsOff\oarg{list}}\DescribeMacro{\WarningsOff*}
+%\DescribeMacro{\ErrorsOff\oarg{list}}\DescribeMacro{\ErrorsOff*}
+%There is one very simple and very effective way to
+%get rid of messages: "\WarningsOff" and "\ErrorsOff". In their
+%starred versions, no warning or error will make it to your log
+%file. Without a star, and without argument either, they filter
+%out all messages except \LaTeX's. Finally, you can specify
+%a list of comma-separated packages whose messages you don't want.
+% For that purpose, \LaTeX\ is considered a package whose name is "latex".
+%For instance "\WarningsOff[superpack,packex]" will remove all
+%warnings issued by the "superpack" and "packex" packages. Messages
+%issued by classes are also accessible in the same way, so to
+%avoid the warning mentioned above, you can say:
+%
+%\vbskip
+%"\RequirePackage"\oarg{options}"{silence}"\\
+%"\WarningsOff[memoir]"\\
+%"\documentclass{memoir}"
+%\vbskip%
+%If you want to filter out \LaTeX's warnings only, you can
+%say "\WarningsOff[latex]". Note that issuing "\WarningsOff[mypack]"
+%after "\WarningsOff", for instance, is useless, because all
+%warnings are already filtered out. But this won't be mentioned to you.
+%And "silence" won't check either whether a censored package exists
+%or not. So if you say "\WarningsOff[mypak]" and mean "\WarningsOff[mypack]",
+%this will go unnoticed.
+%
+%\DescribeMacro{\WarningsOn\oarg{list}}\DescribeMacro{\ErrorsOn\oarg{list}}
+%These commands allow messages to be output again. If there is no \meta{list},
+%all packages are affected, otherwise only specified packages are affected.
+%So, for instance
+%
+%\vbskip
+%"\WarningsOff"\\
+%"Blah blah blah..."\\
+%"\WarningsOn[superpack,packex]"\\
+%"Blah blah blah..."
+%\vbskip
+%will have all warnings turned off, except those issued by \LaTeX\ (because
+%"\WarningsOff" has no star) and by "superpack" and "packex" in the second
+%part of the document.
+%
+%Note that the command described in this section are independant of the
+%filters described in the following one, and vice-versa. That is, 
+%"\WarningsOn" has no effect on the filters, and if you design a filter
+%to avoid a specific message issued by, say, "superpack", "\WarningsOn[superpack]"
+%will not deactivate that filter and that one message will still be
+%filtered out.
+%
+%
+%
+%
+%
+%
+%\subsection{The exquisite way}
+%
+%Turning off all messages might be enough in many cases, especially if
+%you turn them on again rapidly, but it is a blunt approach and it can lead
+%to unwanted results. So "silence" allows you to create filters to target
+%specific messages.
+%
+%\DescribeMacro{\WarningFilter\oarg{family}\\\marg{package}\marg{message}}
+%\DescribeMacro{\ErrorFilter\oarg{family}\\\marg{package}\marg{message}}
+%These commands will filter out messages issued by \meta{package} and beginning with \meta{message}.
+%The optional \meta{family} specification is used to create groups of filters
+%that will be (de)activated together. If there is no family, the filter will be immediately
+%active and you won't be able to turn if off. So, for instance:
+%
+%\vbskip
+%"\WarningFilter{latex}{Marginpar on page}"
+%\vbskip
+%will filter out all \LaTeX\ warnings beginning with `"Marginpar on page"'. On the other
+%hand,
+%
+%\vbskip
+%"\WarningFilter[myfam]{latex}{Marginpar on page}"
+%\vbskip
+%will filter out those same warnings if and only if "myfam" filters are active (but
+%see the "immediate" package option below).
+%
+%You can be quite specific with the text of the message. For instance, 
+%
+%\vbskip
+%"\WarningFilter{latex}{Marginpar on page 2 moved}"
+%\vbskip
+%will filter out marginpar warnings issued on page 2.
+%
+%In this version (contrary to the starred version below), \meta{message} should
+%reproduce the (beginning of) the displayed message. For instance, suppose
+%that you have the following error message:
+%
+%\vbskip
+%"Package superpack Error: The command \foo should not be used here."
+%\vbskip
+%To filter it out, you can simply say:
+%\vbskip
+%"\ErrorFilter"\oarg{family}"{superpack}{The command \foo should not}"
+%\vbskip
+%although you might know that "superpack" didn't produce it so easily,
+%but instead must have said something like:
+%\vbskip
+%"\PackageError{superpack}{The command \string\foo\space should not be used here}{}"
+%\vbskip
+%Here, you don't have to know how the message was produced, but simply what
+%it looks like. The starred versions of those commands below work differently.
+%
+%\DescribeMacro{\ActivateWarningFilters\\\oarg{list}}
+%\DescribeMacro{\ActivateErrorFilters\\\oarg{list}}
+%These macros activate the filters which belong to the families specified
+%in \meta{list}. If there is no such list, all filters are activated. Indeed,
+%unless the "immediate" option is turned on (see below), filters are not active
+%when created, except those that don't belong to a family. Note that \meta{list}
+%contains the name of the family specified in "\WarningFilter"\oarg{family}\marg{package}\marg{message}
+%(and similarly for "\ErrorFilter") and not the name of the package (i.e. \meta{package}), 
+%although you can freely use the same name for both. So for instance:
+%
+%\vbskip
+%"\WarningFilter[myfam]{packex}{You can't do that}"\\
+%"\ActivateWarningFilters[packex]"
+%\vbskip
+%will not activate the desired filter, but instead will try to activate the filters
+%belonging to the "packex" family. If this family doesn't exist, you won't be warned.\footnote{You
+%won't be warned either that the \texttt{packex} family will really be active, which
+%means that if you create (warning) filters with that family name afterwards, they will
+%take effect immediately, even if you're not in \texttt{immediate} mode.}
+%So the proper way instead is:
+%\vbskip
+%"\WarningFilter[myfam]{packex}{You can't do that}"\\
+%"\ActivateWarningFilters[myfam]"
+%\vbskip
+%Finally, if a filter is created while its family is active, it will be active itself
+%from its creation.
+%
+%\DescribeMacro{\DeactivateWarningFilters\\\oarg{list}}
+%\DescribeMacro{\DeactivateErrorFilters\\\oarg{list}}
+%These are self-explanatory. Once again, if there is no list, all filters are
+%deactivated. Note that the "immediate" option implicitly turns on families 
+%associated with the filters that are created, so:
+%
+%\vbskip
+%"\WarningFilter[myfam]{packex}{You can't do that}"\\
+%"\DeactivateWarningFilters[myfam]"\\
+%"\WarningFilter[myfam]{superpack}{This is very bad}"
+%\vbskip
+%will make all filters belonging to "myfam" active if "immediate" is on. 
+%In this example, both filters will be active, although one might have 
+%intended only the second one to be.
+%
+%\DescribeMacro{\ActivateFilters\oarg{list}}
+%\DescribeMacro{\DeactivateFilters\oarg{list}}
+%I bet you know what I'm going to say. These two macros activate
+%or deactivate all filters, or all filters belonging
+%to the specified families in case there's an argument. So
+%you can create error filters and warning filters with the
+%same family name and control them all at once. Isn't it
+%amazing? Note that, just like above, "\ActivateFilters[myfam]"
+%won't complain if there's no "myfam" family, or if there's
+%just a warning family and no error family, and so on and
+%so forth.
+%
+%\DescribeMacro{\WarningFilter*\oarg{family}\\\marg{name}\marg{message}}
+%\DescribeMacro{\ErrorFilter*\oarg{family}\\\marg{name}\marg{message}}
+%These are the same as the starless versions above, except that they
+%target the message not as it appears in the log file but as it was produced.
+%For instance, suppose you have an undefined citation, that is you
+%wrote "\cite{Spinoza1677}" and \LaTeX\ complains as follows:
+%
+%
+%\vbskip
+%\bgroup
+%\hfuzz=1cm
+%"LaTeX Warning: Citation `Spinoza1677' on page 4 undefined on input line 320."
+%
+%\egroup
+%\vbskip
+%You know you have to bring your bibliography up to date, but right now you're
+%working on a terrific idea and you don't have time to waste. So you say:
+%
+%\vbskip
+%"\WarningFilter{latex}{Citation `Spinoza1677'}"
+%\vbskip
+%and everything's ok (since you've turned on the "save" option---see below---you
+%will not forget to fix that reference). So you go on but then, as you're
+%trying to link string theory with german philology, you stumble on that
+%paper with bold new ideas and tens of fascinating references that you can't
+%read but definitely have to cite. As expected, \LaTeX\ will start whining, 
+%because it doesn't like undefined citations. How are you going to shut it up?
+%You might try
+%
+%\vbskip
+%"\WarningFilter{latex}{Citation}"
+%\vbskip
+%but that's dangerous because all warnings beginning with "Citation" will
+%be filtered out, and maybe there are other types of messages which begin with 
+%"Citation" and that you don't want to avoid. So the solution is "\WarningFilter*".
+%Indeed, you can say:
+%
+%\vbskip
+%"\WarningFilter*{latex}{Citation `\@citeb' on page \thepage \space undefined}"
+%\vbskip
+%That is, you target the way the message was produced instead of the way it appears.
+%Of course, you have to know how the message was produced, but that's easy to figure
+%out. In case of a \LaTeX\ message, just check the source (available on the web). In
+%case the message was issued by a package or a class, just give a look at the
+%corresponding files.
+%
+%As a rule of thumb, remember that a command that appears verbatim in the message
+%was probably prefixed with "\protect", "\noexpand" or "\string", and you can try
+%them all. Commands that are expanded are likely to be followed by "\space", to avoid unwanted gobbling.
+%So if a message says `"You can't use \foo here"', it is likely to be produced
+%with `"You can't use \protect\foo here"'. 
+%
+%Here's a comparison of starred and starless filters:
+%
+%\vbskip
+%"\WarningFilter{latex}{Marginpar on page 3 moved}" will filter off marginpar
+%warnings concerning page 3.
+%\vbskip
+%"\WarningFilter{latex}{Marginpar on page \thepage\space moved}" will be inefficient
+%because it will search messages that actually look like the specified text.
+%\vbskip
+%"\WarningFilter*{latex}{Marginpar on page \thepage\space moved}" will filter off 
+%all marginpar warnings.
+%\vbskip
+%"\WarningFilter*{latex}{Marginpar on page 3 moved}" will miss everything because when
+%the the warning is produced the page number is not specified.
+%
+%\DescribeMacro{\SafeMode}\DescribeMacro{\BoldMode}
+%As you might have guessed, evaluating messages as they appear means expanding them.
+%Normally, this should be harmless, but one never knows. So these two commands allow
+%you to turn that process on and off. When you say "\SafeMode", messages are not
+%expanded. In that case, starless filters might miss their goal if the message
+%contains expanded material. Starred filters are unaffected. So if you encounter
+%an avalanche of unexplained error messages, just try some "\SafeMode". "\BoldMode"
+%is used to switch back to the default mode. 
+%
+%This expansion process concerns messages, not filters. That is, there is no need
+%to protect your filter definitions with "\SafeMode". Instead, use this command when
+%you suspect that a message is being sent and "silence" gets everything wrong. Use
+%"\BoldMode" to switch back to normal when messages are not troublesome anymore.
+%Here's an example:
+%
+%\vbskip
+%"\WarningFilter{latex}{Marginpar on page 3 moved}"\\
+%"\WarningFilter*{latex}{Citation `\@citeb' undefined}"\\
+%"..."\\
+%"\SafeMode"\\
+%"..."
+%\bgroup\ttfamily\itshape\obeylines\parindent0pt%
+%Here a strange message is being sent by the \emph{strangex} package.
+%If \upshape"\SafeMode"\itshape\ was not active, we would be in big trouble.
+%The \emph{Marginpar} warnings all go through, because our starless filter
+%is too specific. Fortunately, the \emph{Citation} warnings are correctly
+%avoided.
+%"..."
+%\egroup
+%\noindent"\BoldMode"\\
+%"..."\\
+%\texttt{\emph{Everything is back to normal.}}
+%\vbskip
+%
+%
+%\section{Package options}
+%Here are the options that may be loaded with the package:
+%
+%\vbskip
+%\vbopt{debrief} At the end of the document, "silence" will output a
+%warning saying how many messages were issued during the compilation
+%and how many were filtered out. This warning will not appear if
+%no message was output or if none were filtered out.
+%
+%\vbopt{immediate} Makes filters active as soon as they are created.
+%This does not affect filters created without a family, since they
+%always behave so. If a filter is created with family "myfam", and
+%if that family has been previously deactivated, it will be reactivated.
+%
+%\vbopt{safe} Makes safe mode the default mode. "\BoldMode" and "\SafeMode"
+%are still available.
+%
+%\vbopt{save} Messages that were filtered out are written to an 
+%external file called "jobname.sil".
+%
+%\vbopt{saveall} All messages, including those that were left untouched,
+%are written to "jobname.sil".
+%
+%\vbopt{showwarnings} Warnings are left untouched. That is, "silence"'s
+%commands become harmless. Note that warnings are not written to
+%"jobname.sil", even if the "saveall" option is loaded. This command
+%is useful if you want to recompile your document as usual.
+%
+%\vbopt{showerrors} Same as "showwarnings" for errors.
+%
+%
+%
+%\section{It doesn't work!}
+%Messages can be tricky. This package was originally designed to take
+%care of marginpar warnings, and I wanted to do something like:
+%
+%\vbskip
+%"\WarningsOff*"\\
+%"\marginpar{A marginpar that will move}"\\
+%"\WarningsOn"
+%\vbskip
+%Unfortunately, this doesn't work. Indeed, marginpar warnings are not
+%issued when the "\marginpar" command is used but at the output routine,
+%that is when \LaTeX\ builds the page, which happens at some interesting
+%breakpoint that you're not supposed to know. That's the reason why
+%those messages must be filtered out with warnings that are always
+%active. Of course, this means that you can't filter out just one
+%particular marginpar warning, unless it's the only one on its page.
+%
+%
+%Now, messages aren't always what they seem to be. More precisely,
+%two attributes do not really belong to them: the final full stop
+%and the line number (only for some warnings). For instance, the following
+%message \emph{does not} containt a full stop:
+%\vbskip
+%"Package packex Error: You can't do that."
+%\vbskip
+%The full stop is added by \LaTeX. So
+%\vbskip
+%"\ErrorFilter{packex}{You can't do that.}"
+%\vbskip
+%won't do. You have to remove the stop. This goes the same with the
+%phrase `\texttt{on input line} \meta{number}.' (including the stop once
+%again). That is, the message
+%\vbskip
+%"Package superpack Warning: Something is wrong on input line 352."
+%\vbskip
+%was actually produced with
+%\vbskip
+%"\PackageWarning{superpack}{Something is wrong}"
+%\vbskip
+%The end of it was added by \LaTeX. You know what you have to do.
+%Unfortunately, this means that warnings can't be filtered according
+%to the line they refer to.
+%
+%Another difficulty concerns line breaking in messages. If a new line
+%begins in a message, it was either explicitely created or it's a single
+%line wrapped by your text editor. When properly written, messages use
+%\LaTeX's "\MessageBreak" command to create new lines, which \LaTeX\
+%formats as a nicely indented line with the name of the package at the
+%beginning, between parentheses. So if you encounter such a display,
+%you know that there's something more behind the scene. You have two
+%solutions: either you make the text of your filter shorter than
+%the first line, which in most cases will be accurate enough, or
+%you use a starred filter and explicitely write "\MessageBreak".
+%Unfortunately, you can't use "\MessageBreak" in a starless filter.
+%Note that some stupid people (including the author of this package)
+%sometimes use "^^J" instead of "\MessageBreak", which is a \TeX\
+%construct to create a new line. In that case, the line break
+%will be indistinguishable from a single line wrapped by your text
+%editor (although no wrapping occur in the log file).
+%
+%The most efficient filters are the starred ones (unless
+%you're aiming at a specific value for a variable) whose text has simply
+%been pasted from the source. E.g., if "superpack" tells you:
+%
+%\vbskip
+%"Package superpack Error: You can't use \@terrific@command in"\\
+%"(superpack)              a \@fantastic@environment, because"\\
+%"(superpack)              unbelievable@parameter is off".
+%\vbskip
+%this was probably produced with:
+%\vbskip
+%"\PackageError{superpack}{"\\
+%"  You can't use \protect\@terrific@command in\MessageBreak"\\
+%"  a \protect\@fantastic@environment, because\MessageBreak"\\
+%"  \superparameter\space is off}"\\
+%"  {}"
+%\vbskip
+%with "\superparameter" "\def"ined to "unbelievable@parameter"
+%beforehand. So the simplest way to filter out such a message
+%is to open "superpack.sty", look for it, and copy it as is
+%in a starred filter.
+%
+%
+%There remains one problematic case, if a primitive
+%control sequence appears in the message to be avoided.
+%Imagine for instance that a package sends the warning
+%`"You can't use \def here"'. It will not be reachable
+%with a starless filter, because the package may have
+%said "\def" without any prefix, since primitive commands
+%can be used as such in messages, where they appear verbatim.
+%On the other hand, when you create a starless filter with
+%a command in it, "silence" considers this command simply as a string
+%of characters beginning with a backslash devoid of its
+%usual `escapeness'---as are control sequences prefixed
+%with "\protect", "\string" and "\noexpand" in messages. So
+%"\def" won't be reached. A starred filter might do, but
+%in this case you shouldn't prefix "\def" with any of the
+%three commands just mentioned. Now if "\def" is the result
+%of an expansion, you'll be forced to rely on the previous
+%techniques. Fortunately, this is very rare.
+%
+%Now, in case there's a message you really can't reach, although
+%you pasted it in your filter, just let me know: it's an opportunity
+%to refine "silence".
+%
+%
+%
+%
+%
+%
+% \section{Implementation}
+% \subsection{Basic definitions}
+% \MacrocodeTopsep.5em
+% \def\macskip{\par\vskip-17.7pt\vskip0cm}
+% \let\sldescribemacro\DescribeMacro
+% \def\DescribeMacro{\noindent\sldescribemacro}
+% The options only turn on some conditionals, except "save" and
+% "saveall", which set the count "\sl@save", to be used
+% in a "\ifcase" statement.
+%    \begin{macrocode}
+\makeatletter
+
+\newcount\sl@Save
+\newif\ifsl@Debrief
+\newif\ifsl@ShowWarnings
+\newif\ifsl@ShowErrors
+\newif\ifsl@Immediate
+\newif\ifsl@SafeMode
+
+\DeclareOption{debrief}{\sl@Debrieftrue}
+\DeclareOption{immediate}{\sl@Immediatetrue}
+\DeclareOption{safe}{\sl@SafeModetrue}
+\DeclareOption{save}{\sl@Save1%
+\newwrite\sl@Write%
+\immediate\openout\sl@Write=\jobname.sil}
+\DeclareOption{saveall}{\sl@Save2%
+\newwrite\sl@Write%
+\immediate\openout\sl@Write=\jobname.sil}
+\DeclareOption{showwarnings}{\sl@ShowWarningstrue}
+\DeclareOption{showerrors}{\sl@ShowErrorstrue}
+\ProcessOptions\relax
+%    \end{macrocode}
+
+% Here are the counts, token lists and conditionals, that
+% will be used by warnings and errors.
+%    \begin{macrocode}
+\newcount\sl@StateNumber
+\newcount\sl@MessageCount
+\newcount\sl@Casualties
+
+\newtoks\sl@Filter
+\newtoks\sl@Message
+\newtoks\sl@UnexpandedMessage
+\newtoks\sl@Mess@ge
+
+\newif\ifsl@Check
+\newif\ifsl@Belong
+\newif\ifsl@KillMessage
+\newif\ifsl@SafeTest
+%    \end{macrocode}
+
+% And here are some keywords and further definitions.
+% "\sl@PackageName" is used to identify the name of the
+% package, but in case "\GenericError" or "\GenericWarning"
+% were directly used, it would be undefined (or defined
+% with the name of the last package that issued a message),
+% which would lead to some trouble, hence its definition here.
+%    \begin{macrocode}
+\def\sl@end{sl@end}
+\def\sl@latex{latex}
+\def\sl@Terminator{£}
+\gdef\sl@active{active}
+\gdef\sl@safe{safe}
+\gdef\sl@PackageName{NoPackage}
+\def\SafeMode{\global\sl@SafeModetrue}
+\def\BoldMode{\global\sl@SafeModefalse}
+\def\sl@Gobble#1sl@end,{}
+%    \end{macrocode}
+
+% \subsection{Warnings}
+% Now these are the counts, token lists, conditionals and
+% keywords specific to warnings. "sl@family" is
+% actually the family of those familyless filters. It
+% is made active as wanted.
+%    \begin{macrocode}
+\newcount\sl@WarningCount
+\newcount\sl@WarningNumber
+\newcount\sl@WarningCasualties
+
+\newtoks\sl@TempBOW
+\newtoks\sl@BankOfWarnings
+
+\newif\ifsl@WarningsOff
+\newif\ifsl@NoLine
+
+\expandafter\gdef\csname sl@family:WarningState\endcsname{active}
+\def\sl@WarningNames{}
+\def\sl@UnwantedWarnings{}
+\def\sl@ProtectedWarnings{}
+%    \end{macrocode}
+
+% \subsubsection{Brutal commands}
+% \DescribeMacro{\WarningsOn}
+% The basic mechanism behind "\WarningsOn" and "\WarningsOff"
+% is a conditional, namely "\ifsl@WarningsOff". When a warning is sent,
+% "silence" checks the value of this conditional and acts
+% accordingly: if it is set to "true", then the warning is
+% filtered out unless it belongs to the "\sl@ProtectedWarnings"
+% list; if it is set to "false", the warning is output unless
+% it belongs to the "\sl@UnwantedWarnings" list.
+% 
+% Without argument, "\WarningsOn" empties both lists and sets
+% this conditional to "false". (Emptying "\sl@ProtectedWarnings"
+% is useless but it keeps the list clean.) If it has an argument,
+% its behavior depends on the conditional; if it is set to
+% "true", the argument is added to "\sl@ProtectedWarnings";
+% otherwise, it is removed from "\sl@UnwantedWarnings".
+%
+%    \begin{macrocode}
+\def\WarningsOn{%
+  \@ifnextchar[%
+  {\ifsl@WarningsOff%
+      \def\sl@next{\sl@Add\sl@ProtectedWarnings}%
+    \else%
+      \def\sl@next{\sl@Remove\sl@UnwantedWarnings}%
+    \fi\sl@next}%
+  {\global\sl@WarningsOfffalse%
+  \gdef\sl@ProtectedWarnings{}%
+  \gdef\sl@UnwantedWarnings{}}}
+%    \end{macrocode}
+
+% \DescribeMacro{\WarningsOff}
+% "\WarningsOff" does the same as "\WarningsOn", but in
+% the other way. If it has no star and no argument,
+% "\sl@ProtectedWarnings" is overwritten with only
+% "latex" in it.
+%
+%    \begin{macrocode}
+\def\WarningsOff{%
+  \@ifstar%
+  {\global\sl@WarningsOfftrue
+    \gdef\sl@UnwantedWarnings{}%
+    \gdef\sl@ProtectedWarnings{}}%
+  {\@ifnextchar[{%
+    \ifsl@WarningsOff%
+      \def\sl@next{\sl@Remove\sl@ProtectedWarnings}%
+    \else%
+      \def\sl@next{\sl@Add\sl@UnwantedWarnings}%
+    \fi\sl@next}%
+    {\global\sl@WarningsOfftrue%
+    \gdef\sl@UnwantedWarnings{}%
+    \gdef\sl@ProtectedWarnings{latex,}}}}
+%    \end{macrocode}
+%
+% Note that the "\WarningsOn" and "\WarningsOff"
+% don't really take any argument. If an opening bracket is
+% present, they launch "\sl@Add" or "\sl@Remove" on the
+% adequate list.
+
+% \DescribeMacro{\sl@Add}
+% "\sl@Add" is no more than an "\xdef" of the list
+% on itself, plus the new item.
+%
+%    \begin{macrocode}
+\def\sl@Add#1[#2]{%
+  \xdef#1{#1#2,}}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@Remove}
+% "\sl@Remove" is slightly more complicated. It stores
+% the items to be removed and then
+% launches the recursive "\sl@@Remove" on the expanded list,
+% with a terminator to stop it.
+% When "\sl@@Remove" has done its job, the list will
+% be "\let" to the new one.
+%
+%    \begin{macrocode}
+\def\sl@Remove#1[#2]{%
+  \def\sl@Items{#2}
+  \def\sl@TempNewList{}%
+  \expandafter\sl@@Remove#1sl@end,%
+  \let#1\sl@TempNewList}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@@Remove}
+% This macro takes each element of the list to
+% be updated, checks it against the items to be
+% removed, and builds a new list containing the element
+% currently tested if and only if it has not been
+% matched with items to be removed.
+%
+% First, we check the current element of the list,
+% and if it's the terminator we end recursion.
+%
+%    \begin{macrocode}
+\def\sl@@Remove#1,{%
+  \def\sl@Tempa{#1}%
+  \ifx\sl@Tempa\sl@end%
+    \let\sl@next\relax%
+%    \end{macrocode}
+%
+% \noindent Otherwise, we launch "\sl@ListCheck" on the element.
+%
+%    \begin{macrocode}
+  \else%
+    \sl@Checkfalse%
+    \expandafter\sl@ListCheck\sl@Items,sl@end,%
+%    \end{macrocode}
+%
+% \noindent If the check is positive, we do nothing. If not,
+% we add the element to "\sl@TempNewList", which is
+% itself repeated to keep the former elements.
+%
+%    \begin{macrocode}
+    \ifsl@Check%
+    \else%
+      \xdef\sl@TempNewList{\sl@TempNewList#1,}%
+    \fi%
+    \let\sl@next\sl@@Remove%
+  \fi\sl@next}%
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@ListCheck}
+% Here's the internal checking mechanism. It takes an argument
+% (from the expansion of "\sl@Items" above) and compares
+% it to the element under scrutiny. In case they match,
+% the proper conditional is turned to "true", and we
+% launch "\sl@Gobble" to discard remaining items. Otherwise,
+% we proceed to the next item.
+%
+% First we check for the terminator, as usual, and
+% the recursion is ended in case we find it. 
+%
+%    \begin{macrocode}
+\def\sl@ListCheck#1,{%
+  \def\sl@Tempb{#1}%
+  \ifx\sl@Tempb\sl@end%
+    \let\sl@next\relax%
+%    \end{macrocode}
+%
+% \noindent If the item is not the terminator,
+% we compare it to the current element. If they
+% match, we confirm the test and gobble.
+%
+%    \begin{macrocode}
+  \else%
+    \ifx\sl@Tempa\sl@Tempb%
+      \sl@Checktrue
+      \let\sl@next\sl@Gobble%
+%    \end{macrocode}
+%
+% \noindent Otherwise we repeat.
+%
+%    \begin{macrocode}
+    \else%
+      \let\sl@next\sl@ListCheck%
+    \fi%
+  \fi\sl@next}
+%    \end{macrocode}
+
+% \subsubsection{Filters}
+% \DescribeMacro{\WarningFilter}
+% Let's now turn to filters.
+% When created, each warning filter is associated
+% with a "\sl@WarningNumber" to retrieve it and to specify its
+% status. In case of "\WarningFilter*", this status, referred to
+% with "\csname\the\sl@WarningNumber:WarningMode\endcsname" (i.e.
+% "\"\meta{number}":WarningMode", where \meta{number} is the unique
+% number associated with the filter), is
+% set to ``"safe"''. Otherwise, we don't bother to define it,
+% because when evaluated the above command will then be
+% equal to "\relax" (as are all undefined commands called with
+% "\csname... \endcsname").
+% This will be checked in due time to know whether
+% the expanded or the unexpanded version of the target message
+% must be tested.
+%
+%    \begin{macrocode}
+\def\WarningFilter{%
+  \global\advance\sl@WarningNumber1%
+  \@ifstar%
+    {\expandafter\gdef\csname\the\sl@WarningNumber:WarningMode\endcsname{safe}%
+    \sl@WarningFilter}%
+    {\sl@WarningFilter}}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@WarningFilter}
+% Once the star has been checked, we look for an optional argument.
+% In case there is none, we assign the "sl@family" to the filter.
+%
+%    \begin{macrocode}
+\def\sl@WarningFilter{%
+  \@ifnextchar[%
+  {\sl@@WarningFilter}%
+  {\sl@@WarningFilter[sl@family]}}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@@WarningFilter}
+% Here comes the big part. First, we update the list of
+% filters associated with a package, stored in "\"\meta{package}"@WarningFilter".
+% The list itself is a concatenation of comma-separated pairs of
+% the form \meta{number}":sl@"\meta{family} referring to filters. 
+% When \meta{package} issues a warning, "silence" checks the filters
+% contained in the associated list. \meta{number} is
+% used to determine the "WarningMode" ("safe" or undefined, as noted above), so
+% that the right test will be run, while \meta{family} is used
+% to ensure that this family is active.
+% 
+% First we update the list:
+%
+%    \begin{macrocode}
+\def\sl@@WarningFilter[#1]#2{%
+  \expandafter\ifx\csname #2@WarningFilter\endcsname\relax%
+    \expandafter\xdef\csname #2@WarningFilter\endcsname{\the\sl@WarningNumber:sl@#1}%
+  \else%
+    \expandafter\xdef\csname #2@WarningFilter\endcsname{%
+      \csname #2@WarningFilter\endcsname,\the\sl@WarningNumber:sl@#1}%
+  \fi%
+%    \end{macrocode}
+%
+% \noindent Now, if "\"\meta{family}":WarningState" is undefined, this means
+% that this is the first time we encounter that family. So we store
+% its name, which  will be useful for "\ActivateWarningFilters" and
+% its deactivating counterpart.
+%
+%    \begin{macrocode}
+  \expandafter\ifx\csname #1:WarningState\endcsname\relax%
+    \sl@Add\sl@WarningNames[#1]%
+  \fi%
+%    \end{macrocode}
+%
+% \noindent Next, we check "WarningState" again; if it's not active, we change it,
+% depending on whether we're in "immediate" mode or not.
+%    \begin{macrocode}
+  \expandafter\ifx\csname #1:WarningState\endcsname\sl@active%
+  \else%
+    \ifsl@Immediate%
+      \expandafter\gdef\csname #1:WarningState\endcsname{active}%
+    \else%
+      \expandafter\gdef\csname #1:WarningState\endcsname{inactive}%
+    \fi%
+  \fi%
+%    \end{macrocode}
+%
+% \noindent Finally, we prepare the storage of the filter's message.
+% We open a group, and if the filter is starred, we turn "@" into
+% a letter, so that it will be able to form macro names.
+% If the filter has no star, we turn the escape character into
+% a normal one, so that control sequences won't be formed. Messages
+% will then be tested token by token, and if a message contains e.g. "\foo",
+% then it has (most likely) been "\string"'ed, so it's really a sequence of characters
+% with "\catcode" 12 (including the escape character) that the starless
+% filter will match.
+%    \begin{macrocode}
+  \begingroup%
+  \expandafter\ifx\csname\the\sl@WarningNumber:WarningMode\endcsname\sl@safe%
+    \makeatletter%
+  \else%
+    \catcode`\\12\relax%
+  \fi%
+  \sl@AddToBankOfWarnings}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@AddToBankOfWarnings}
+% Now we add the filter to the "\sl@BankOfWarnings" token list,
+% delimited by "(:sl@"\meta{number}":)", where \meta{number}
+% is the number assigned to it above. Thus, it might be easily
+% retrieved. Following a technique explained by Victor Eijkhout
+% in \emph{\TeX\ by Topic}, we make use of "\edef" to add an item
+% to a token list. First, we store it in the temporary "\sl@TempBOW"
+% token list. Then we "\edef" "\sl@act" such that its definition
+% will be:
+%
+% \vbskip
+% "\sl@BankOfWarnings{"\meta{previous content}"(:sl@"\meta{number}":)"\meta{filter}"(:sl@"\meta{number}":)}"
+% \vbskip
+% Thus, the "\sl@BankOfWarnings" token list will add the new filter
+% to itself. This works because token lists prefixed with "\the" in an "\edef"
+% expand to their content unexpanded, unlike normal macros. The macro
+% is made "\long" just in case.
+%
+%    \begin{macrocode}
+\long\def\sl@AddToBankOfWarnings#1{%
+  \sl@TempBOW{#1}%
+  \edef\sl@act{%
+  \global\noexpand\sl@BankOfWarnings{%
+    \the\sl@BankOfWarnings%
+    (:sl@\the\sl@WarningNumber:)\the\sl@TempBOW(:sl@\the\sl@WarningNumber:)}}%
+  \sl@act%
+  \endgroup}
+%    \end{macrocode}
+
+% \DescribeMacro{\ActivateWarningFilters}
+% \DescribeMacro{\DeactivateWarningFilters}
+% This macro launches a recursive redefinition
+% of its expanded argument, which is either a list
+% defined by the user or the list containing
+% all warning families (updated in "\WarningFilter"
+% above). We set "\sl@StateNumber" to register
+% what the redefinition should be: activate or deactivate "WarningState",
+% or activate or deactivate "ErrorState".
+%
+%    \begin{macrocode}
+\def\ActivateWarningFilters{%
+  \sl@StateNumber0\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@WarningNames]}}
+
+\def\DeactivateWarningFilters{%
+  \sl@StateNumber1\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@WarningNames]}}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@ChangeState}
+% \DescribeMacro{\sl@@ChangeState}
+% "\sl@ChangeState" only calls "\sl@@ChangeState" on
+% the expanded argument, adding a terminator.
+% "\sl@@ChangeState" checks whether its argument
+% is the terminator, in which case it stops, or else
+% it sets its state to the appropriate value, depending
+% on "\sl@StateNumber"
+%
+%    \begin{macrocode}
+\def\sl@ChangeState[#1]{%
+  \expandafter\sl@@ChangeState#1,sl@end,}
+
+\def\sl@@ChangeState#1,{%
+  \def\sl@Tempa{#1}%
+  \ifx\sl@Tempa\sl@end%
+    \let\sl@next\relax%
+  \else%
+    \ifcase\sl@StateNumber%
+      \expandafter\gdef\csname #1:WarningState\endcsname{active}%
+    \or%
+      \expandafter\gdef\csname #1:WarningState\endcsname{inactive}%
+    \or%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{active}%
+    \or%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{inactive}%
+    \fi%
+    \let\sl@next\sl@@ChangeState%
+  \fi\sl@next}
+%    \end{macrocode}
+
+% \DescribeMacro{\ActivateFilters}
+% \DescribeMacro{\DeactivateFilters}
+% This aren't just shorthands, something more
+% is needed in case there's an argument (because we
+% have to retrieve it to pass it to two macros).
+% However, it's rather straightforward, we're just
+% using "\sl@StateNumber" to keep track of what
+% is needed.
+%
+% \DescribeMacro{\sl@RetrieveArgument}
+% Here we just rely on the value required for
+% "WarningState", i.e. 0 or 1, and the value
+% for "ErrorState" follows suit.
+%
+%    \begin{macrocode}
+\def\ActivateFilters{%
+  \@ifnextchar[%
+  {\sl@StateNumber0%
+  \sl@RetrieveArgument}%
+  {\sl@StateNumber0\relax%
+  \sl@ChangeState[\sl@WarningNames]%
+  \sl@StateNumber2\relax%
+  \sl@ChangeState[\sl@ErrorNames]}}
+
+\def\DeactivateFilters{%
+  \@ifnextchar[%
+  {\sl@StateNumber1%
+  \sl@RetrieveArgument}%
+  {\sl@StateNumber1\relax%
+  \sl@ChangeState[\sl@WarningNames]%
+  \sl@StateNumber3\relax%
+  \sl@ChangeState[\sl@ErrorNames]}}
+
+\def\sl@RetrieveArgument[#1]{%
+  \def\sl@Argument{#1}
+  \ifcase\sl@StateNumber%
+    \sl@ChangeState[\sl@Argument]%
+    \sl@StateNumber2\relax%
+    \sl@ChangeState[\sl@Argument]%
+  \or%
+    \sl@ChangeState[\sl@Argument]%
+    \sl@StateNumber3\relax%
+    \sl@ChangeState[\sl@Argument]%
+  \fi}
+%    \end{macrocode}
+
+%
+% 
+% \subsubsection{String testing}
+% Now, here comes the crux of the biscuit, as some guitarist from
+% California once said. Here are the macros to test the messages.
+% They will be used in the redefinition of "\GenericWarning".
+%
+% \DescribeMacro{\sl@GetNumber}
+% When packages send a warning, "silence" launches "\sl@GetNumber"
+% on the expanded list of \meta{number}":sl@"\meta{family} pairs associated
+% with this package (created in "\WarningFilter" above). Remember that \meta{number}
+% refers to a filter and \meta{family} to its family.
+%
+% If \meta{number} is not 0 (which is associated with the terminator
+% added when "\sl@GetNumber" is launched),
+% we test whether the family is active. If so, "\sl@GetMessage" is
+% called; otherwise, we proceed to the next pair.
+%
+% The command
+% \vbskip
+% "\csname #2:\ifcase\sl@StateNumber Warning\or Error\fi State\endcsname"
+% \vbskip
+% reduces to "\"\meta{family}":WarningState" or "\"\meta{family}":ErrorState",
+% depending on the value of "\sl@StateNumber", which is turned
+% to 0 if we're testing a warning or to 1 if we're testing an error.
+%
+%    \begin{macrocode}
+\def\sl@GetNumber#1:sl@#2,{%
+  \ifnum#1>0%
+    \expandafter%
+    \ifx\csname #2:\ifcase\sl@StateNumber Warning\or Error\fi State\endcsname\sl@active%
+      \sl@GetMessage{#1}%
+    \else%
+      \let\sl@next\sl@GetNumber%
+    \fi%
+  \else%
+    \let\sl@next\relax%
+  \fi\sl@next}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@GetMessage}
+% \noindent Now we're going to retrieve the filter from the "\sl@BankOfWarnings"
+% token list. This list has the following structure, as you might remember:
+% \vbskip
+% "(:sl@1:)"\meta{first filter}"(:sl@1:)(:sl@2:)"\meta{second filter}"(:sl@2:)...(:sl@n:)"\meta{\emph{n}th filter}"(:sl@n:)"
+% \vbskip
+% To do so, "\sl@GetMessage" defines a new macro on the fly, "\sl@@GetMessage",
+% which takes three arguments, delimited by "(:sl@"\meta{number}":)",
+% where \meta{numbers} depends on the pair we're in. That is, suppose
+% "\sl@GetNumber" is examining the pair "15:sl@myfam" and "myfam"
+% is active. Then we feed "15" to "\sl@GetMessage", which in turn
+% creates "\sl@@GetMessage" with the arguments delimited by "(:sl@15:)".
+% The first and the third arguments are discarded, while the second
+% one, which is the message of the filter, is stored in the "\sl@Filter"
+% token list, along with a terminator.\footnote{This terminator
+% is the \texttt{\pounds} symbol, unfortunately totally unverbatimizable. So
+% it appears as "£".}
+%
+%    \begin{macrocode}
+\def\sl@GetMessage#1{%
+  \def\sl@@GetMessage##1(:sl@#1:)##2(:sl@#1:)##3(:sl@end:){\sl@Filter={##2£}}%
+%    \end{macrocode}
+%
+% \noindent Now we launch this command on the bank of warnings (or errors)
+% expanded one step, thanks to the same "\edef" trick as above.
+%
+%    \begin{macrocode}
+  \ifcase\sl@StateNumber%
+    \edef\sl@act{\noexpand\sl@@GetMessage\the\sl@BankOfWarnings(:sl@end:)}%
+  \or%
+    \edef\sl@act{\noexpand\sl@@GetMessage\the\sl@BankOfErrors(:sl@end:)}%
+  \fi%
+  \sl@act%
+%    \end{macrocode}
+%
+% \noindent When a warning is sent, its message is stored in two forms,
+% expanded and unexpanded. Depending on the mode we're currently in
+% (safe or bold), we retrieve the right form; in safe mode, we take
+% the unexpanded form; in bold mode, we take it too if the "WarningMode"
+% of this particular filter is "safe" (i.e. if it was created with
+% "\WarningFilter*"), otherwise we take the expanded version.
+%
+% "\sl@Message" is the token list containing the expanded version,
+% "\sl@UnexpandedMessage" contains the unexpanded version, and "\sl@Mess@ge"
+% stores the adequate version for the test to come followed by a terminator.
+%
+% At the end of this macro, we call the string tester.
+%
+%    \begin{macrocode}
+  \ifsl@SafeMode%
+    \sl@SafeTesttrue%
+    \edef\sl@act{\noexpand\sl@Mess@ge{\the\sl@UnexpandedMessage£}}%
+  \else%
+    \expandafter%
+    \ifx\csname #1:\ifcase\sl@StateNumber Warning\or Error\fi Mode\endcsname\sl@safe%
+      \sl@SafeTesttrue%
+      \edef\sl@act{\noexpand\sl@Mess@ge{\the\sl@UnexpandedMessage£}}%
+    \else%
+      \sl@SafeTestfalse%
+      \edef\sl@act{\noexpand\sl@Mess@ge{\the\sl@Message£}}%
+    \fi%
+  \fi%
+  \sl@act%
+  \sl@TestStrings}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@TestStrings}
+% This test is a recursive token by token comparison
+% of "\sl@Filter" and "\sl@Message", i.e. it compares 
+% two strings.
+%
+% First we take the first token of each token list
+% thanks, once again, to an "\edef". They are stored
+% in "\sl@FilterToken" and "\sl@MessageToken", which
+% are macros, not token lists, by the way (see below
+% the definition of "\sl@Slice").
+%
+%    \begin{macrocode}
+\def\sl@TestStrings{%
+  \edef\sl@act{%
+  \noexpand\sl@Slice\the\sl@Filter(:sl@mid:)\noexpand\sl@Filter\noexpand\sl@FilterToken%
+  \noexpand\sl@Slice\the\sl@Mess@ge(:sl@mid:)\noexpand\sl@Mess@ge\noexpand\sl@MessageToken}%
+  \sl@act%
+%    \end{macrocode}
+%
+% \noindent Then we simply run some conditional.
+% If we reach the terminator in the filter, this means
+% that it matches the warning (otherwise we wouldn't have
+% gone so far), so we turn a very sad conditional to "true",
+% stop the recursion of "\sl@TestString" (thanks to "\sl@@next")
+% and gobble the remaining \meta{number}":sl@"\meta{family} pairs waiting to be evaluated
+% by "\sl@GetNumber" (thanks to "\sl@next"). Our job is done,
+% and "silence" grins with cruelty.
+%
+%    \begin{macrocode}
+  \ifx\sl@FilterToken\sl@Terminator%
+    \sl@KillMessagetrue%
+    \let\sl@@next\relax%
+    \let\sl@next\sl@Gobble%
+%    \end{macrocode}
+%
+% \noindent On the other hand, if we reach the terminator in the warning text,
+% this means that it is shorter than the filter (unless we also
+% reach the terminator in the filter, but this was taken care of
+% in the previous case), so they don't match. We stop recursion
+% (there's nothing left to test) and make "\sl@GetNumber" consider
+% the following pair.
+%
+%    \begin{macrocode}
+  \else
+    \ifx\sl@MessageToken\sl@Terminator%
+      \let\sl@@next\relax%
+      \let\sl@next\sl@GetNumber%
+%    \end{macrocode}
+%
+% \noindent Now, if none of the tokens is a terminator, then we
+% have to compare them. The test will depend on the value
+% of "\ifsl@SafeTest" which was turned to "true" in case
+% we're in safe mode or the filter is a starred one. In that
+% case we run an "\ifx" test, so that even control sequences
+% can be properly compared. Since the message is not expanded,
+% this is vital. If the tokens match, we proceed to the next
+% ones; otherwise, this means that the filter and the message
+% are different, so we stop recursion (there's no reason to
+% test further), and we call "\sl@GetNumber" on the next pair.
+%
+%    \begin{macrocode}
+    \else%
+      \ifsl@SafeTest%
+        \ifx\sl@FilterToken\sl@MessageToken%
+          \let\sl@@next\sl@TestStrings%
+        \else%
+          \let\sl@@next\relax%
+          \let\sl@next\sl@GetNumber%
+        \fi%
+%    \end{macrocode}
+%
+% \noindent If we're in bold mode and the filter is starless,
+% then we simply compare character codes with "\if". Thus,
+% the letters of, say, "\foo", in the filter, will match
+% their counterpart in the warning (where the command has
+% probably been "\string"'ed), although their category codes
+% are different: it's 11 in the filter (no control sequence
+% was ever created: "\" was turned to a normal character
+% before the filter was stored) and 12 in the message
+% (like all "\string"'ed characters).
+%
+%    \begin{macrocode}
+      \else%
+        \if\sl@FilterToken\sl@MessageToken%
+          \let\sl@@next\sl@TestStrings%
+        \else%
+          \let\sl@@next\relax%
+          \let\sl@next\sl@GetNumber%
+        \fi%
+      \fi%
+    \fi%
+  \fi\sl@@next}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@Slice}
+% And here's the final cog in this testing. To put it quite
+% unintelligibly, "\sl@Slice" defines its fourth argument
+% to expand to the first, while the third, which is a
+% token list, is set to the second, and you should not
+% forget that the first two arguments are just an expansion
+% of the third. Copy that?
+% 
+% Let's get things clear. Remember that "\sl@act" at the 
+% beginning of "\sl@TestStrings" above was "\edef"ined to:
+% \vbskip
+% "\noexpand\sl@Slice\the\sl@Filter(:sl@mid:)\noexpand\sl@Filter\noexpand\sl@FilterToken"
+% \vbskip
+% and similarly for the message. This means that its definition
+% text is:
+% \vbskip
+% "\sl@Slice"\meta{content of $\backslash$\texttt{\emph{sl@Filter}}}"(:sl@mid:)\sl@Filter\sl@FilterToken"
+% \vbskip
+% The first argument of "\sl@Slice" is undelimited.
+% This means that it will be the first token of 
+% \meta{content of $\backslash$\texttt{\emph{sl@Filter}}}.
+% Its second argument will be the rest of this content.
+% Now, as explained, "\sl@Slice" defines its fourth argument,
+% namely "\sl@FilterToken", to expand to its first one, namely
+% the first token in the "\sl@Filter" token list, and
+% sets this token list to the second argument, i.e. the to
+% rest of itself. In short, we're emptying "\sl@Filter" token by
+% token and we compare them along the way, as described above.
+% 
+%    \begin{macrocode}    
+\def\sl@Slice#1#2(:sl@mid:)#3#4{\def#4{#1}#3={#2}}
+%    \end{macrocode}
+
+% \subsubsection{Redefining warnings}
+% \DescribeMacro{\sl@Belong}
+% We have two more macros to create before we can redefine
+% warnings themselves.
+% "\sl@Belong" is used to check whether a package belongs
+% to the "\sl@UnwantedWarnings" list or the "\sl@ProtectedWarnings" list
+% (correspondingly for errors). Its argument is an item of those lists
+% expanded, that is, the name of a package. It is
+% compared to "\sl@PackageName", which is defined
+% to the name of the package sending the message.
+% If they don't match, we relaunch the command on
+% the next item. If they do, we turn "\ifsl@Belong"
+% to "true" and gobble the following items.
+%
+%    \begin{macrocode}  
+\def\sl@Belong#1,{%
+  \def\sl@Tempa{#1}
+  \ifx\sl@Tempa\sl@end%
+    \let\sl@next\relax%
+  \else%
+    \ifx\sl@Tempa\sl@PackageName%
+      \sl@Belongtrue%
+      \let\sl@next\sl@Gobble%
+    \else%
+      \let\sl@next\sl@Belong%
+    \fi%
+  \fi\sl@next}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@StoreMessage}
+% Finally, we need a mechanism to store the message
+% being sent. In safe mode, we store it unexpanded.
+% In bold mode, we also store it unexpanded for
+% starred filters, but we also store an expanded version
+% where "\protect" and "\noexpand" are "\let" to
+% "\string", so that the control sequences they
+% prefix will be turned into sequences of characters
+% (remember that no control sequence is formed in the
+% text of a starless filter, only strings of characters). 
+% We do this in a group because, well, you know,
+% you shouldn't do that...
+%
+%    \begin{macrocode}
+\def\sl@StoreMessage#1{%
+  \ifsl@SafeMode%
+    \sl@UnexpandedMessage{#1}%
+  \else%
+    \sl@UnexpandedMessage{#1}%
+    \bgroup%
+    \let\protect\string%
+    \let\noexpand\string%
+    \edef\sl@Tempa{#1}%
+    \global\expandafter\sl@Message\expandafter{\sl@Tempa}%
+    \egroup%
+  \fi}
+%    \end{macrocode}
+
+% Now we're ready for the big redefinitions.
+% First, if the "showwarnings" option is on, we
+% simply redefine nothing, otherwise we begin by retrieving the current definitions
+% of the commands used to issue warnings, in order
+% to patch them. For instance, we "\let" "\sl@PackageWarning"
+% to "\PackageWarning", and thus we'll be able to
+% write:
+% 
+% \vbskip
+% "\def\PackageWarning#1#2{%"\\
+% "  "\meta{additional code}\\
+% "  \sl@PackageWarning{#1}{#2}}"
+% \vbskip
+% and this will launch "\sl@PackageWarning", i.e. the
+% original definition of "\PackageWarning", which will
+% do the job it was meant to do in the first place.
+% 
+% For "\GenericWarning",
+% this needs some hacking. Indeed "\GenericWarning" is robust,
+% which means that it actually does nothing except
+% calling "\protect\GenericWarning"\meta{space}, where
+% "\GenericWarning"\meta{space} is defined to
+% issue the warning as wanted.
+% Thus, if we simply 
+% "\let" "\sl@GenericWarning" to "\GenericWarning" and
+% write:
+% 
+% \vbskip
+% "\DeclareRobustCommand{\GenericWarning}[2]{%"\\
+% "  "\meta{additional code}\\
+% "  \sl@GenericWarning{#1}{#2}}"
+% \vbskip
+% then, because of the robust declaration, "\GenericWarning" 
+% will be defined to "\protect" "\GenericWarning"\meta{space},
+% whose definition is the additional code followed by 
+% "\sl@GenericWarning" which, because it was "\let" to
+% the older version of "\GenericWarning", expands to
+% "\GenericWarning"\meta{space}---that is, we enter an
+% infinite loop. The solution is to "\let" "\sl@GenericWarning"
+% directly to "\GenericWarning"\meta{space}.
+%
+%    \begin{macrocode}
+\ifsl@ShowWarnings
+\else
+\expandafter\let\expandafter\sl@GenericWarning\csname GenericWarning \endcsname
+\let\sl@PackageWarning\PackageWarning
+\let\sl@ClassWarning\ClassWarning
+\let\sl@latex@warning\@latex@warning
+%    \end{macrocode}
+
+% \DescribeMacro{\PackageWarning}
+% We redefine "\PackageWarning" so that it stores
+% the name of the package calling it, and the message only
+% if a certain conditional is true, that is if it
+% has not been sent with "\PackageWarningNoLine"
+%
+%    \begin{macrocode}
+\def\PackageWarning#1#2{%
+  \def\sl@PackageName{#1}%
+  \ifsl@NoLine%
+    \sl@NoLinefalse%
+  \else%
+    \sl@StoreMessage{#2}%
+  \fi%
+  \sl@PackageWarning{#1}{#2}}
+%    \end{macrocode}
+
+% \DescribeMacro{\PackageWarningNoLine}
+% For "\PackageWarningNoLine", we simply store the message
+% and send it to "\PackageWarning" with an additional "\@gobble"
+% to discard the `"on input line..."' phrase added by \LaTeX.
+% (This "\@gobble" was already in the original definition, there
+% is nothing new here.)
+%
+%    \begin{macrocode}
+\def\PackageWarningNoLine#1#2{%
+  \sl@StoreMessage{#2}%
+  \sl@NoLinetrue%
+  \PackageWarning{#1}{#2\@gobble}}
+%    \end{macrocode}
+
+% \DescribeMacro{\ClassWarning}\DescribeMacro{\ClassWarningNoLine}
+% \DescribeMacro{\@latex@warning}\DescribeMacro{\@latex@warning@no@line}
+% We do exactly the same for class warnings and \LaTeX\ warnings, except
+% that in the latter case we manually set "\sl@PackageName" to "latex".
+%
+%    \begin{macrocode}
+\def\ClassWarning#1#2{%
+  \def\sl@PackageName{#1}%
+  \ifsl@NoLine%
+    \sl@NoLinefalse%
+  \else%
+    \sl@StoreMessage{#2}%
+  \fi%
+  \sl@ClassWarning{#1}{#2}}
+
+\def\ClassWarningNoLine#1#2{%
+  \sl@StoreMessage{#2}%
+  \sl@NoLinetrue%
+  \ClassWarning{#1}{#2\@gobble}}
+
+\def\@latex@warning#1{%
+  \def\sl@PackageName{latex}%
+  \ifsl@NoLine%
+    \sl@NoLinefalse%
+  \else%
+    \sl@StoreMessage{#1}%
+  \fi%
+  \sl@latex@warning{#1}}
+
+\def\@latex@warning@no@line#1{%
+  \sl@StoreMessage{#1}%
+  \sl@NoLinetrue%
+  \@latex@warning{#1\@gobble}}
+%    \end{macrocode}
+
+% \DescribeMacro{\GenericWarning}
+% Now we can redefine "\GenericWarning". Originally, a message
+% sent with, for instance, "\PackageWarning", is edited, and sent to
+% "\GenericWarning", which edits it further and sends it to
+% the log file. None of this is modified here, although
+% some names have changed. Indeed, "\PackageWarning"
+% now stores the name of the package and the message
+% but then calls "\sl@PackageWarning" on them, which has
+% been "\let" to the previous value of "\PackageWarning".
+% So the message is formatted as usual and sent to
+% "\GenericWarning" which, if the message is not filtered out,
+% will launch "\sl@GenericWarning" on the same arguments
+% and thus \LaTeX's original mechanism will pass unaffected---albeit
+% somewhat spied upon... The original command is robust, so
+% we make it robust too.
+%
+% First, we increment "\sl@WarningCount", which will be used
+% if the "debrief" option is on. We also restore some conditional
+% to their default values.
+%
+%    \begin{macrocode}
+\DeclareRobustCommand{\GenericWarning}[2]{%
+  \advance\sl@WarningCount1\relax%
+  \sl@KillMessagefalse%
+  \sl@Belongfalse%
+%    \end{macrocode}
+%
+% \noindent Next, we launch "\sl@Belong" on the expanded
+% list of protected warnings if warnings are off, or on
+% the expanded list of unwanted warnings if they're on. Depending
+% on the result (see the comment on "\WarningsOn" and "\WarningsOff"
+% above), we might sentence the message to death. (Turn on
+% the "save" option, please, so it may live a happy afterlife
+% in "jobname.sil".)
+%
+%    \begin{macrocode}
+  \ifsl@WarningsOff%
+    \expandafter\sl@Belong\sl@ProtectedWarnings sl@end,%
+    \ifsl@Belong%
+    \else%
+      \sl@KillMessagetrue%
+    \fi%
+  \else%
+    \expandafter\sl@Belong\sl@UnwantedWarnings sl@end,%
+    \ifsl@Belong%
+      \sl@KillMessagetrue%
+    \fi%
+  \fi%
+%    \end{macrocode}
+%
+% \noindent If the preceding operation is not enough,
+% we check whether some filters are associated with the
+% package sending the message (in which case "\"\meta{package}"@WarningFilter"
+% is defined and contains \meta{number}":sl@"\meta{family} pairs).
+% If there are some, we test them with "\sl@GetNumber" as defined above.
+%
+%    \begin{macrocode}
+  \ifsl@KillMessage%
+  \else%
+    \expandafter\ifx\csname\sl@PackageName @WarningFilter\endcsname\relax%
+    \else%
+      \sl@StateNumber0\relax%
+      \expandafter\expandafter\expandafter%
+      \sl@GetNumber\csname\sl@PackageName @WarningFilter\endcsname,0:sl@sl@end,%
+    \fi%
+  \fi%
+%    \end{macrocode}
+%
+% \noindent Now the message's fate is sealed. If it has
+% been doomed to filtering, we grimly step a sad sad counter.
+% Otherwise, we happily sends everything to "\sl@GenericWarning"
+% to enlighten the user's log file.
+%
+%    \begin{macrocode}
+  \ifsl@KillMessage%
+    \advance\sl@WarningCasualties1%
+  \else%
+    \sl@GenericWarning{#1}{#2}%
+  \fi%
+%    \end{macrocode}
+%
+% \noindent Finally, we consider saving it. "\sl@Save" is 0
+% by default, 1 if the "save" option is on, and 2 if "saveall"
+% is on. We act accordingly: case 0 does nothing, case 1 sends
+% the message to "jobname.sil" if it has been filtered out,
+% and case 2 sends all messages. Instead of writing
+% everything out properly, we simply `re-route' "\sl@GenericWarning"
+% by "\let"ting "\@unused", \LaTeX's output stream, to "\sl@Write",
+% "silence"'s output stream directed to "jobname.sil". We do this
+% locally, of course.
+%
+%    \begin{macrocode}
+  \ifcase\sl@Save%
+  \or%
+    \ifsl@KillMessage%
+      \bgroup%
+      \let\@unused\sl@Write%
+      \sl@GenericWarning{#1}{#2}%
+      \egroup%
+    \fi%
+  \or%
+    \bgroup%
+    \let\@unused\sl@Write%
+    \sl@GenericWarning{#1}{#2}%
+    \egroup%
+  \fi%
+%    \end{macrocode}
+%
+% \noindent Before closing, we set "\sl@PackageName" to
+% "NoPackage", just in case (very unlikely, to be sure)
+% a package uses "\GenericWarning" directly. Thus, the
+% former value of "\sl@PackageName" won't interfere. The final
+% "\fi" matches "\ifsl@ShowWarnings" some hundred lines
+% above.
+%
+%    \begin{macrocode}
+  \gdef\sl@PackageName{NoPackage}}%
+\fi
+%    \end{macrocode}
+
+
+% \subsection{Errors}
+% Errors are implemented just like warnings, so I don't
+% command the code. See you at the end of the package
+% for the last macro.
+%
+%    \begin{macrocode}
+\newcount\sl@ErrorCount
+\newcount\sl@ErrorNumber
+\newcount\sl@ErrorCasualties
+
+\newtoks\sl@TempBOE
+\newtoks\sl@BankOfErrors
+
+\newif\ifsl@ErrorsOff
+
+\expandafter\gdef\csname sl@family:ErrorState\endcsname{active}
+\expandafter\gdef\csname sl@end:ErrorState\endcsname{active}
+\def\sl@ErrorNames{}
+\def\sl@UnwantedErrors{}
+\def\sl@ProtectedErrors{}
+%    \end{macrocode}
+
+% \DescribeMacro{\ErrorsOn}
+% \macskip
+%    \begin{macrocode}
+\def\ErrorsOn{%
+  \@ifnextchar[%
+  {\ifsl@ErrorsOff%
+      \def\sl@next{\sl@Add\sl@ProtectedErrors}%
+    \else%
+      \def\sl@next{\sl@Remove\sl@UnwantedErrors}%
+    \fi\sl@next}%
+  {\global\sl@ErrorsOfffalse%
+  \gdef\sl@ProtectedErrors{}%
+  \gdef\sl@UnwantedErrors{}}}
+%    \end{macrocode}
+
+% \DescribeMacro{\ErrorsOff}
+% \macskip
+%    \begin{macrocode}
+\def\ErrorsOff{%
+  \@ifstar%
+  {\global\sl@ErrorsOfftrue
+    \gdef\sl@UnwantedErrors{}%
+    \gdef\sl@ProtectedErrors{}}%
+  {\@ifnextchar[{%
+    \ifsl@ErrorsOff%
+      \def\sl@next{\sl@Remove\sl@ProtectedErrors}%
+    \else%
+      \def\sl@next{\sl@Add\sl@UnwantedErrors}%
+    \fi\sl@next}%
+    {\global\sl@ErrorsOfftrue%
+    \gdef\sl@UnwantedErrors{}%
+    \gdef\sl@ProtectedErrors{latex,}}}}
+%    \end{macrocode}
+
+% \DescribeMacro{\ErrorFilter}
+% \DescribeMacro{\sl@ErrorFilter}
+% \DescribeMacro{\sl@@ErrorFilter}
+% \macskip
+%    \begin{macrocode}
+\def\ErrorFilter{%
+  \global\advance\sl@ErrorNumber1%
+  \@ifstar%
+    {\expandafter\gdef\csname\the\sl@ErrorNumber:ErrorMode\endcsname{safe}\sl@ErrorFilter}%
+    {\sl@ErrorFilter}}
+
+\def\sl@ErrorFilter{%
+  \@ifnextchar[%
+  {\sl@@ErrorFilter}%
+  {\sl@@ErrorFilter[sl@family]}}
+
+\def\sl@@ErrorFilter[#1]#2{%
+  \expandafter\ifx\csname #2@ErrorFilter\endcsname\relax%
+    \expandafter\xdef\csname #2@ErrorFilter\endcsname{\the\sl@ErrorNumber:sl@#1}%
+  \else%
+    \expandafter\xdef\csname #2@ErrorFilter\endcsname{%
+      \csname #2@ErrorFilter\endcsname,\the\sl@ErrorNumber:sl@#1}%
+  \fi%
+  \expandafter\ifx\csname #1:ErrorState\endcsname\relax%
+    \sl@Add\sl@ErrorNames[#1]%
+  \fi%
+  \expandafter\ifx\csname #1:ErrorState\endcsname\sl@active%
+  \else%
+    \ifsl@Immediate%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{active}%
+    \else%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{inactive}%
+    \fi%
+  \fi%
+  \begingroup%
+  \expandafter\ifx\csname\the\sl@ErrorNumber:ErrorMode\endcsname\sl@safe%
+    \makeatletter%
+  \else%
+     \catcode`\\12\relax%
+  \fi%
+  \sl@AddToBankOfErrors}
+%    \end{macrocode}
+
+% \DescribeMacro{\sl@AddToBankOfErrors}
+% \macskip
+%    \begin{macrocode}
+\long\def\sl@AddToBankOfErrors#1{%
+  \sl@TempBOE{#1}%
+  \edef\sl@act{%
+    \global\noexpand\sl@BankOfErrors{%
+    \the\sl@BankOfErrors%
+    (:sl@\the\sl@ErrorNumber:)\the\sl@TempBOE(:sl@\the\sl@ErrorNumber:)}}%
+  \sl@act%
+  \endgroup}
+%    \end{macrocode}
+
+% \DescribeMacro{\ActivateErrorFilters}
+% \macskip
+%    \begin{macrocode}
+\def\ActivateErrorFilters{%
+  \sl@StateNumber2\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@ErrorNames]}}
+%    \end{macrocode}
+
+% \DescribeMacro{\DeactivateErrorFilters}
+% \macskip
+%    \begin{macrocode}
+\def\DeactivateErrorFilters{%
+  \sl@StateNumber3\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@ErrorNames]}}
+
+\ifsl@ShowErrors
+\else
+\expandafter\let\expandafter\sl@GenericError\csname GenericError \endcsname
+\let\sl@PackageError\PackageError
+\let\sl@ClassError\ClassError
+\let\sl@latex@error\@latex@error
+%    \end{macrocode}
+
+% \DescribeMacro{\PackageError}
+% \DescribeMacro{\ClassError}
+% \DescribeMacro{\@latex@error}
+% \macskip
+%    \begin{macrocode}
+\def\PackageError#1#2#3{%
+  \def\sl@PackageName{#1}%
+  \sl@StoreMessage{#2}%
+  \sl@PackageError{#1}{#2}{#3}}
+
+\def\ClassError#1#2#3{%
+  \def\sl@PackageName{#1}%
+  \sl@StoreMessage{#2}%
+  \sl@ClassError{#1}{#2}{#3}}
+
+\def\@latex@error#1#2{%
+  \def\sl@PackageName{latex}%
+  \sl@StoreMessage{#1}%
+  \sl@latex@error{#1}{#2}}
+%    \end{macrocode}
+
+% \DescribeMacro{\GenericError}
+% \macskip
+%    \begin{macrocode}
+\DeclareRobustCommand{\GenericError}[4]{%
+  \advance\sl@ErrorCount1\relax%
+  \sl@KillMessagefalse%
+  \sl@Belongfalse%
+  \ifsl@ErrorsOff%
+    \expandafter\sl@Belong\sl@ProtectedErrors,sl@end,%
+    \ifsl@Belong%
+    \else%
+      \sl@KillMessagetrue%
+    \fi%
+  \else%
+    \expandafter\sl@Belong\sl@UnwantedErrors,sl@end,%
+    \ifsl@Belong%
+      \sl@KillMessagetrue%
+    \fi%
+  \fi%
+  \ifsl@KillMessage%
+  \else%
+    \expandafter\ifx\csname\sl@PackageName @ErrorFilter\endcsname\relax%
+    \else%
+      \sl@StateNumber1\relax%
+      \expandafter\expandafter\expandafter%
+      \sl@GetNumber\csname\sl@PackageName @ErrorFilter\endcsname,0:sl@sl@end,%
+    \fi%
+  \fi%
+  \ifsl@KillMessage%
+    \advance\sl@ErrorCasualties1%
+  \else%
+    \sl@GenericError{#1}{#2}{#3}{#4}%
+  \fi%
+  \ifcase\sl@Save%
+  \or%
+    \ifsl@KillMessage%
+      \bgroup%
+      \let\@unused\sl@Write%
+      \sl@GenericError{#1}{#2}{#3}{#4}%
+      \egroup%
+    \fi%
+  \or%
+    \bgroup%
+    \let\@unused\sl@Write%
+    \sl@GenericError{#1}{#2}{#3}{#4}%
+    \egroup%
+  \fi%
+  \gdef\sl@PackageName{NoPackage}}%
+  \fi
+%    \end{macrocode}
+%
+% \subsection{Debrief}
+% Finally, at the end of the document, we
+% issue a debrief if the user requested it.
+%
+% A "\clearpage" is needed because we want
+% the final output routine to be processed so
+% we don't miss the last messages if there are
+% some.
+% 
+%    \begin{macrocode}
+\AtEndDocument{%
+  \ifsl@Debrief%
+    \clearpage%
+%    \end{macrocode}
+%
+% \noindent Then we do some arithmetics and if messages
+% appeared and some of them were filtered out,
+% we output the warning.
+%
+% And we say goodbye.
+%
+%    \begin{macrocode}
+    \sl@MessageCount\sl@WarningCount%
+    \advance\sl@MessageCount\sl@ErrorCount%
+    \sl@Casualties\sl@WarningCasualties%
+    \advance\sl@Casualties\sl@ErrorCasualties%
+    \ifnum\sl@MessageCount>0%
+      \ifnum\sl@Casualties>0%
+        \advance\sl@WarningCount-1%
+        \PackageWarningNoLine{silence}{%
+        There were \the\sl@WarningCount\space warning(s)
+        and \the\sl@ErrorCount\space error(s).\MessageBreak%
+        \ifnum\sl@Casualties=\sl@MessageCount%
+          None survived. This is a violent world%
+        \else%
+          I've killed \the\sl@WarningCasualties\space warning(s)
+          and \the\sl@ErrorCasualties\space error(s)%
+        \fi}%
+      \fi%
+    \fi%
+  \fi}
+
+\makeatother
+%    \end{macrocode}
\ No newline at end of file
diff --git a/Master/texmf-dist/source/latex/silence/silence.ins b/Master/texmf-dist/source/latex/silence/silence.ins
new file mode 100644
index 00000000000..17564a3eb0e
--- /dev/null
+++ b/Master/texmf-dist/source/latex/silence/silence.ins
@@ -0,0 +1,31 @@
+\input docstrip.tex

+\askforoverwritefalse

+\keepsilent

+\preamble

+

+******************************************************************************

+******************************************************************************

+**                                                                          **

+** silence v.1.1 by Paul Isambert                                           **

+** See the documentation for a comment on the implementation.               **

+**                                                                          **

+** This set of macros is published under the LaTeX Project Public License:  **

+**                                                                          **

+** Do whatever you want to that software,                                   **

+** but if you modify it, change its name to avoid confusion,                **

+** and if you copy part of the code please mention where it comes from.     **

+**                                                                          **

+** Comments, suggestions and bugs:                                          **

+**                                                                          **

+** zappathustra@free.fr                                                     **

+**                                                                          **

+** http://paulisambert.free.fr/                                             **

+**                                                                          **

+** Enjoy!                                                                   **

+**                                                                          **

+******************************************************************************

+******************************************************************************

+

+\endpreamble

+\generate{\file{silence.sty}{\from{silence-doc.dtx}{package}}}

+\endbatchfile

diff --git a/Master/texmf-dist/tex/latex/silence/silence.sty b/Master/texmf-dist/tex/latex/silence/silence.sty
new file mode 100644
index 00000000000..521e15907a7
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/silence/silence.sty
@@ -0,0 +1,652 @@
+%%
+%% This is file `silence.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% silence-doc.dtx  (with options: `package')
+%% 
+%% ******************************************************************************
+%% ******************************************************************************
+%% **                                                                          **
+%% ** silence v.1.1 by Paul Isambert                                           **
+%% ** See the documentation for a comment on the implementation.               **
+%% **                                                                          **
+%% ** This set of macros is published under the LaTeX Project Public License:  **
+%% **                                                                          **
+%% ** Do whatever you want to that software,                                   **
+%% ** but if you modify it, change its name to avoid confusion,                **
+%% ** and if you copy part of the code please mention where it comes from.     **
+%% **                                                                          **
+%% ** Comments, suggestions and bugs:                                          **
+%% **                                                                          **
+%% ** zappathustra@free.fr                                                     **
+%% **                                                                          **
+%% ** http://paulisambert.free.fr/                                             **
+%% **                                                                          **
+%% ** Enjoy!                                                                   **
+%% **                                                                          **
+%% ******************************************************************************
+%% ******************************************************************************
+%% 
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{silence}[2009/02/20 v1.1 Selective filtering of warnings and error messages]
+\makeatletter
+
+\newcount\sl@Save
+\newif\ifsl@Debrief
+\newif\ifsl@ShowWarnings
+\newif\ifsl@ShowErrors
+\newif\ifsl@Immediate
+\newif\ifsl@SafeMode
+
+\DeclareOption{debrief}{\sl@Debrieftrue}
+\DeclareOption{immediate}{\sl@Immediatetrue}
+\DeclareOption{safe}{\sl@SafeModetrue}
+\DeclareOption{save}{\sl@Save1%
+\newwrite\sl@Write%
+\immediate\openout\sl@Write=\jobname.sil}
+\DeclareOption{saveall}{\sl@Save2%
+\newwrite\sl@Write%
+\immediate\openout\sl@Write=\jobname.sil}
+\DeclareOption{showwarnings}{\sl@ShowWarningstrue}
+\DeclareOption{showerrors}{\sl@ShowErrorstrue}
+\ProcessOptions\relax
+
+\newcount\sl@StateNumber
+\newcount\sl@MessageCount
+\newcount\sl@Casualties
+
+\newtoks\sl@Filter
+\newtoks\sl@Message
+\newtoks\sl@UnexpandedMessage
+\newtoks\sl@Mess@ge
+
+\newif\ifsl@Check
+\newif\ifsl@Belong
+\newif\ifsl@KillMessage
+\newif\ifsl@SafeTest
+
+\def\sl@end{sl@end}
+\def\sl@latex{latex}
+\def\sl@Terminator{£}
+\gdef\sl@active{active}
+\gdef\sl@safe{safe}
+\gdef\sl@PackageName{NoPackage}
+\def\SafeMode{\global\sl@SafeModetrue}
+\def\BoldMode{\global\sl@SafeModefalse}
+\def\sl@Gobble#1sl@end,{}
+
+\newcount\sl@WarningCount
+\newcount\sl@WarningNumber
+\newcount\sl@WarningCasualties
+
+\newtoks\sl@TempBOW
+\newtoks\sl@BankOfWarnings
+
+\newif\ifsl@WarningsOff
+\newif\ifsl@NoLine
+
+\expandafter\gdef\csname sl@family:WarningState\endcsname{active}
+\def\sl@WarningNames{}
+\def\sl@UnwantedWarnings{}
+\def\sl@ProtectedWarnings{}
+
+\def\WarningsOn{%
+  \@ifnextchar[%
+  {\ifsl@WarningsOff%
+      \def\sl@next{\sl@Add\sl@ProtectedWarnings}%
+    \else%
+      \def\sl@next{\sl@Remove\sl@UnwantedWarnings}%
+    \fi\sl@next}%
+  {\global\sl@WarningsOfffalse%
+  \gdef\sl@ProtectedWarnings{}%
+  \gdef\sl@UnwantedWarnings{}}}
+
+\def\WarningsOff{%
+  \@ifstar%
+  {\global\sl@WarningsOfftrue
+    \gdef\sl@UnwantedWarnings{}%
+    \gdef\sl@ProtectedWarnings{}}%
+  {\@ifnextchar[{%
+    \ifsl@WarningsOff%
+      \def\sl@next{\sl@Remove\sl@ProtectedWarnings}%
+    \else%
+      \def\sl@next{\sl@Add\sl@UnwantedWarnings}%
+    \fi\sl@next}%
+    {\global\sl@WarningsOfftrue%
+    \gdef\sl@UnwantedWarnings{}%
+    \gdef\sl@ProtectedWarnings{latex,}}}}
+
+\def\sl@Add#1[#2]{%
+  \xdef#1{#1#2,}}
+
+\def\sl@Remove#1[#2]{%
+  \def\sl@Items{#2}
+  \def\sl@TempNewList{}%
+  \expandafter\sl@@Remove#1sl@end,%
+  \let#1\sl@TempNewList}
+
+\def\sl@@Remove#1,{%
+  \def\sl@Tempa{#1}%
+  \ifx\sl@Tempa\sl@end%
+    \let\sl@next\relax%
+  \else%
+    \sl@Checkfalse%
+    \expandafter\sl@ListCheck\sl@Items,sl@end,%
+    \ifsl@Check%
+    \else%
+      \xdef\sl@TempNewList{\sl@TempNewList#1,}%
+    \fi%
+    \let\sl@next\sl@@Remove%
+  \fi\sl@next}%
+
+\def\sl@ListCheck#1,{%
+  \def\sl@Tempb{#1}%
+  \ifx\sl@Tempb\sl@end%
+    \let\sl@next\relax%
+  \else%
+    \ifx\sl@Tempa\sl@Tempb%
+      \sl@Checktrue
+      \let\sl@next\sl@Gobble%
+    \else%
+      \let\sl@next\sl@ListCheck%
+    \fi%
+  \fi\sl@next}
+
+\def\WarningFilter{%
+  \global\advance\sl@WarningNumber1%
+  \@ifstar%
+    {\expandafter\gdef\csname\the\sl@WarningNumber:WarningMode\endcsname{safe}%
+    \sl@WarningFilter}%
+    {\sl@WarningFilter}}
+
+\def\sl@WarningFilter{%
+  \@ifnextchar[%
+  {\sl@@WarningFilter}%
+  {\sl@@WarningFilter[sl@family]}}
+
+\def\sl@@WarningFilter[#1]#2{%
+  \expandafter\ifx\csname #2@WarningFilter\endcsname\relax%
+    \expandafter\xdef\csname #2@WarningFilter\endcsname{\the\sl@WarningNumber:sl@#1}%
+  \else%
+    \expandafter\xdef\csname #2@WarningFilter\endcsname{%
+      \csname #2@WarningFilter\endcsname,\the\sl@WarningNumber:sl@#1}%
+  \fi%
+  \expandafter\ifx\csname #1:WarningState\endcsname\relax%
+    \sl@Add\sl@WarningNames[#1]%
+  \fi%
+  \expandafter\ifx\csname #1:WarningState\endcsname\sl@active%
+  \else%
+    \ifsl@Immediate%
+      \expandafter\gdef\csname #1:WarningState\endcsname{active}%
+    \else%
+      \expandafter\gdef\csname #1:WarningState\endcsname{inactive}%
+    \fi%
+  \fi%
+  \begingroup%
+  \expandafter\ifx\csname\the\sl@WarningNumber:WarningMode\endcsname\sl@safe%
+    \makeatletter%
+  \else%
+    \catcode`\\12\relax%
+  \fi%
+  \sl@AddToBankOfWarnings}
+
+\long\def\sl@AddToBankOfWarnings#1{%
+  \sl@TempBOW{#1}%
+  \edef\sl@act{%
+  \global\noexpand\sl@BankOfWarnings{%
+    \the\sl@BankOfWarnings%
+    (:sl@\the\sl@WarningNumber:)\the\sl@TempBOW(:sl@\the\sl@WarningNumber:)}}%
+  \sl@act%
+  \endgroup}
+
+\def\ActivateWarningFilters{%
+  \sl@StateNumber0\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@WarningNames]}}
+
+\def\DeactivateWarningFilters{%
+  \sl@StateNumber1\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@WarningNames]}}
+
+\def\sl@ChangeState[#1]{%
+  \expandafter\sl@@ChangeState#1,sl@end,}
+
+\def\sl@@ChangeState#1,{%
+  \def\sl@Tempa{#1}%
+  \ifx\sl@Tempa\sl@end%
+    \let\sl@next\relax%
+  \else%
+    \ifcase\sl@StateNumber%
+      \expandafter\gdef\csname #1:WarningState\endcsname{active}%
+    \or%
+      \expandafter\gdef\csname #1:WarningState\endcsname{inactive}%
+    \or%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{active}%
+    \or%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{inactive}%
+    \fi%
+    \let\sl@next\sl@@ChangeState%
+  \fi\sl@next}
+
+\def\ActivateFilters{%
+  \@ifnextchar[%
+  {\sl@StateNumber0%
+  \sl@RetrieveArgument}%
+  {\sl@StateNumber0\relax%
+  \sl@ChangeState[\sl@WarningNames]%
+  \sl@StateNumber2\relax%
+  \sl@ChangeState[\sl@ErrorNames]}}
+
+\def\DeactivateFilters{%
+  \@ifnextchar[%
+  {\sl@StateNumber1%
+  \sl@RetrieveArgument}%
+  {\sl@StateNumber1\relax%
+  \sl@ChangeState[\sl@WarningNames]%
+  \sl@StateNumber3\relax%
+  \sl@ChangeState[\sl@ErrorNames]}}
+
+\def\sl@RetrieveArgument[#1]{%
+  \def\sl@Argument{#1}
+  \ifcase\sl@StateNumber%
+    \sl@ChangeState[\sl@Argument]%
+    \sl@StateNumber2\relax%
+    \sl@ChangeState[\sl@Argument]%
+  \or%
+    \sl@ChangeState[\sl@Argument]%
+    \sl@StateNumber3\relax%
+    \sl@ChangeState[\sl@Argument]%
+  \fi}
+
+\def\sl@GetNumber#1:sl@#2,{%
+  \ifnum#1>0%
+    \expandafter%
+    \ifx\csname #2:\ifcase\sl@StateNumber Warning\or Error\fi State\endcsname\sl@active%
+      \sl@GetMessage{#1}%
+    \else%
+      \let\sl@next\sl@GetNumber%
+    \fi%
+  \else%
+    \let\sl@next\relax%
+  \fi\sl@next}
+
+\def\sl@GetMessage#1{%
+  \def\sl@@GetMessage##1(:sl@#1:)##2(:sl@#1:)##3(:sl@end:){\sl@Filter={##2£}}%
+  \ifcase\sl@StateNumber%
+    \edef\sl@act{\noexpand\sl@@GetMessage\the\sl@BankOfWarnings(:sl@end:)}%
+  \or%
+    \edef\sl@act{\noexpand\sl@@GetMessage\the\sl@BankOfErrors(:sl@end:)}%
+  \fi%
+  \sl@act%
+  \ifsl@SafeMode%
+    \sl@SafeTesttrue%
+    \edef\sl@act{\noexpand\sl@Mess@ge{\the\sl@UnexpandedMessage£}}%
+  \else%
+    \expandafter%
+    \ifx\csname #1:\ifcase\sl@StateNumber Warning\or Error\fi Mode\endcsname\sl@safe%
+      \sl@SafeTesttrue%
+      \edef\sl@act{\noexpand\sl@Mess@ge{\the\sl@UnexpandedMessage£}}%
+    \else%
+      \sl@SafeTestfalse%
+      \edef\sl@act{\noexpand\sl@Mess@ge{\the\sl@Message£}}%
+    \fi%
+  \fi%
+  \sl@act%
+  \sl@TestStrings}
+
+\def\sl@TestStrings{%
+  \edef\sl@act{%
+  \noexpand\sl@Slice\the\sl@Filter(:sl@mid:)\noexpand\sl@Filter\noexpand\sl@FilterToken%
+  \noexpand\sl@Slice\the\sl@Mess@ge(:sl@mid:)\noexpand\sl@Mess@ge\noexpand\sl@MessageToken}%
+  \sl@act%
+  \ifx\sl@FilterToken\sl@Terminator%
+    \sl@KillMessagetrue%
+    \let\sl@@next\relax%
+    \let\sl@next\sl@Gobble%
+  \else
+    \ifx\sl@MessageToken\sl@Terminator%
+      \let\sl@@next\relax%
+      \let\sl@next\sl@GetNumber%
+    \else%
+      \ifsl@SafeTest%
+        \ifx\sl@FilterToken\sl@MessageToken%
+          \let\sl@@next\sl@TestStrings%
+        \else%
+          \let\sl@@next\relax%
+          \let\sl@next\sl@GetNumber%
+        \fi%
+      \else%
+        \if\sl@FilterToken\sl@MessageToken%
+          \let\sl@@next\sl@TestStrings%
+        \else%
+          \let\sl@@next\relax%
+          \let\sl@next\sl@GetNumber%
+        \fi%
+      \fi%
+    \fi%
+  \fi\sl@@next}
+
+\def\sl@Slice#1#2(:sl@mid:)#3#4{\def#4{#1}#3={#2}}
+
+\def\sl@Belong#1,{%
+  \def\sl@Tempa{#1}
+  \ifx\sl@Tempa\sl@end%
+    \let\sl@next\relax%
+  \else%
+    \ifx\sl@Tempa\sl@PackageName%
+      \sl@Belongtrue%
+      \let\sl@next\sl@Gobble%
+    \else%
+      \let\sl@next\sl@Belong%
+    \fi%
+  \fi\sl@next}
+
+\def\sl@StoreMessage#1{%
+  \ifsl@SafeMode%
+    \sl@UnexpandedMessage{#1}%
+  \else%
+    \sl@UnexpandedMessage{#1}%
+    \bgroup%
+    \let\protect\string%
+    \let\noexpand\string%
+    \edef\sl@Tempa{#1}%
+    \global\expandafter\sl@Message\expandafter{\sl@Tempa}%
+    \egroup%
+  \fi}
+
+\ifsl@ShowWarnings
+\else
+\expandafter\let\expandafter\sl@GenericWarning\csname GenericWarning \endcsname
+\let\sl@PackageWarning\PackageWarning
+\let\sl@ClassWarning\ClassWarning
+\let\sl@latex@warning\@latex@warning
+
+\def\PackageWarning#1#2{%
+  \def\sl@PackageName{#1}%
+  \ifsl@NoLine%
+    \sl@NoLinefalse%
+  \else%
+    \sl@StoreMessage{#2}%
+  \fi%
+  \sl@PackageWarning{#1}{#2}}
+
+\def\PackageWarningNoLine#1#2{%
+  \sl@StoreMessage{#2}%
+  \sl@NoLinetrue%
+  \PackageWarning{#1}{#2\@gobble}}
+
+\def\ClassWarning#1#2{%
+  \def\sl@PackageName{#1}%
+  \ifsl@NoLine%
+    \sl@NoLinefalse%
+  \else%
+    \sl@StoreMessage{#2}%
+  \fi%
+  \sl@ClassWarning{#1}{#2}}
+
+\def\ClassWarningNoLine#1#2{%
+  \sl@StoreMessage{#2}%
+  \sl@NoLinetrue%
+  \ClassWarning{#1}{#2\@gobble}}
+
+\def\@latex@warning#1{%
+  \def\sl@PackageName{latex}%
+  \ifsl@NoLine%
+    \sl@NoLinefalse%
+  \else%
+    \sl@StoreMessage{#1}%
+  \fi%
+  \sl@latex@warning{#1}}
+
+\def\@latex@warning@no@line#1{%
+  \sl@StoreMessage{#1}%
+  \sl@NoLinetrue%
+  \@latex@warning{#1\@gobble}}
+
+\DeclareRobustCommand{\GenericWarning}[2]{%
+  \advance\sl@WarningCount1\relax%
+  \sl@KillMessagefalse%
+  \sl@Belongfalse%
+  \ifsl@WarningsOff%
+    \expandafter\sl@Belong\sl@ProtectedWarnings sl@end,%
+    \ifsl@Belong%
+    \else%
+      \sl@KillMessagetrue%
+    \fi%
+  \else%
+    \expandafter\sl@Belong\sl@UnwantedWarnings sl@end,%
+    \ifsl@Belong%
+      \sl@KillMessagetrue%
+    \fi%
+  \fi%
+  \ifsl@KillMessage%
+  \else%
+    \expandafter\ifx\csname\sl@PackageName @WarningFilter\endcsname\relax%
+    \else%
+      \sl@StateNumber0\relax%
+      \expandafter\expandafter\expandafter%
+      \sl@GetNumber\csname\sl@PackageName @WarningFilter\endcsname,0:sl@sl@end,%
+    \fi%
+  \fi%
+  \ifsl@KillMessage%
+    \advance\sl@WarningCasualties1%
+  \else%
+    \sl@GenericWarning{#1}{#2}%
+  \fi%
+  \ifcase\sl@Save%
+  \or%
+    \ifsl@KillMessage%
+      \bgroup%
+      \let\@unused\sl@Write%
+      \sl@GenericWarning{#1}{#2}%
+      \egroup%
+    \fi%
+  \or%
+    \bgroup%
+    \let\@unused\sl@Write%
+    \sl@GenericWarning{#1}{#2}%
+    \egroup%
+  \fi%
+  \gdef\sl@PackageName{NoPackage}}%
+\fi
+
+\newcount\sl@ErrorCount
+\newcount\sl@ErrorNumber
+\newcount\sl@ErrorCasualties
+
+\newtoks\sl@TempBOE
+\newtoks\sl@BankOfErrors
+
+\newif\ifsl@ErrorsOff
+
+\expandafter\gdef\csname sl@family:ErrorState\endcsname{active}
+\expandafter\gdef\csname sl@end:ErrorState\endcsname{active}
+\def\sl@ErrorNames{}
+\def\sl@UnwantedErrors{}
+\def\sl@ProtectedErrors{}
+
+\def\ErrorsOn{%
+  \@ifnextchar[%
+  {\ifsl@ErrorsOff%
+      \def\sl@next{\sl@Add\sl@ProtectedErrors}%
+    \else%
+      \def\sl@next{\sl@Remove\sl@UnwantedErrors}%
+    \fi\sl@next}%
+  {\global\sl@ErrorsOfffalse%
+  \gdef\sl@ProtectedErrors{}%
+  \gdef\sl@UnwantedErrors{}}}
+
+\def\ErrorsOff{%
+  \@ifstar%
+  {\global\sl@ErrorsOfftrue
+    \gdef\sl@UnwantedErrors{}%
+    \gdef\sl@ProtectedErrors{}}%
+  {\@ifnextchar[{%
+    \ifsl@ErrorsOff%
+      \def\sl@next{\sl@Remove\sl@ProtectedErrors}%
+    \else%
+      \def\sl@next{\sl@Add\sl@UnwantedErrors}%
+    \fi\sl@next}%
+    {\global\sl@ErrorsOfftrue%
+    \gdef\sl@UnwantedErrors{}%
+    \gdef\sl@ProtectedErrors{latex,}}}}
+
+\def\ErrorFilter{%
+  \global\advance\sl@ErrorNumber1%
+  \@ifstar%
+    {\expandafter\gdef\csname\the\sl@ErrorNumber:ErrorMode\endcsname{safe}\sl@ErrorFilter}%
+    {\sl@ErrorFilter}}
+
+\def\sl@ErrorFilter{%
+  \@ifnextchar[%
+  {\sl@@ErrorFilter}%
+  {\sl@@ErrorFilter[sl@family]}}
+
+\def\sl@@ErrorFilter[#1]#2{%
+  \expandafter\ifx\csname #2@ErrorFilter\endcsname\relax%
+    \expandafter\xdef\csname #2@ErrorFilter\endcsname{\the\sl@ErrorNumber:sl@#1}%
+  \else%
+    \expandafter\xdef\csname #2@ErrorFilter\endcsname{%
+      \csname #2@ErrorFilter\endcsname,\the\sl@ErrorNumber:sl@#1}%
+  \fi%
+  \expandafter\ifx\csname #1:ErrorState\endcsname\relax%
+    \sl@Add\sl@ErrorNames[#1]%
+  \fi%
+  \expandafter\ifx\csname #1:ErrorState\endcsname\sl@active%
+  \else%
+    \ifsl@Immediate%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{active}%
+    \else%
+      \expandafter\gdef\csname #1:ErrorState\endcsname{inactive}%
+    \fi%
+  \fi%
+  \begingroup%
+  \expandafter\ifx\csname\the\sl@ErrorNumber:ErrorMode\endcsname\sl@safe%
+    \makeatletter%
+  \else%
+     \catcode`\\12\relax%
+  \fi%
+  \sl@AddToBankOfErrors}
+
+\long\def\sl@AddToBankOfErrors#1{%
+  \sl@TempBOE{#1}%
+  \edef\sl@act{%
+    \global\noexpand\sl@BankOfErrors{%
+    \the\sl@BankOfErrors%
+    (:sl@\the\sl@ErrorNumber:)\the\sl@TempBOE(:sl@\the\sl@ErrorNumber:)}}%
+  \sl@act%
+  \endgroup}
+
+\def\ActivateErrorFilters{%
+  \sl@StateNumber2\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@ErrorNames]}}
+
+\def\DeactivateErrorFilters{%
+  \sl@StateNumber3\relax%
+  \@ifnextchar[%
+  {\sl@ChangeState}%
+  {\sl@ChangeState[\sl@ErrorNames]}}
+
+\ifsl@ShowErrors
+\else
+\expandafter\let\expandafter\sl@GenericError\csname GenericError \endcsname
+\let\sl@PackageError\PackageError
+\let\sl@ClassError\ClassError
+\let\sl@latex@error\@latex@error
+
+\def\PackageError#1#2#3{%
+  \def\sl@PackageName{#1}%
+  \sl@StoreMessage{#2}%
+  \sl@PackageError{#1}{#2}{#3}}
+
+\def\ClassError#1#2#3{%
+  \def\sl@PackageName{#1}%
+  \sl@StoreMessage{#2}%
+  \sl@ClassError{#1}{#2}{#3}}
+
+\def\@latex@error#1#2{%
+  \def\sl@PackageName{latex}%
+  \sl@StoreMessage{#1}%
+  \sl@latex@error{#1}{#2}}
+
+\DeclareRobustCommand{\GenericError}[4]{%
+  \advance\sl@ErrorCount1\relax%
+  \sl@KillMessagefalse%
+  \sl@Belongfalse%
+  \ifsl@ErrorsOff%
+    \expandafter\sl@Belong\sl@ProtectedErrors,sl@end,%
+    \ifsl@Belong%
+    \else%
+      \sl@KillMessagetrue%
+    \fi%
+  \else%
+    \expandafter\sl@Belong\sl@UnwantedErrors,sl@end,%
+    \ifsl@Belong%
+      \sl@KillMessagetrue%
+    \fi%
+  \fi%
+  \ifsl@KillMessage%
+  \else%
+    \expandafter\ifx\csname\sl@PackageName @ErrorFilter\endcsname\relax%
+    \else%
+      \sl@StateNumber1\relax%
+      \expandafter\expandafter\expandafter%
+      \sl@GetNumber\csname\sl@PackageName @ErrorFilter\endcsname,0:sl@sl@end,%
+    \fi%
+  \fi%
+  \ifsl@KillMessage%
+    \advance\sl@ErrorCasualties1%
+  \else%
+    \sl@GenericError{#1}{#2}{#3}{#4}%
+  \fi%
+  \ifcase\sl@Save%
+  \or%
+    \ifsl@KillMessage%
+      \bgroup%
+      \let\@unused\sl@Write%
+      \sl@GenericError{#1}{#2}{#3}{#4}%
+      \egroup%
+    \fi%
+  \or%
+    \bgroup%
+    \let\@unused\sl@Write%
+    \sl@GenericError{#1}{#2}{#3}{#4}%
+    \egroup%
+  \fi%
+  \gdef\sl@PackageName{NoPackage}}%
+  \fi
+\AtEndDocument{%
+  \ifsl@Debrief%
+    \clearpage%
+    \sl@MessageCount\sl@WarningCount%
+    \advance\sl@MessageCount\sl@ErrorCount%
+    \sl@Casualties\sl@WarningCasualties%
+    \advance\sl@Casualties\sl@ErrorCasualties%
+    \ifnum\sl@MessageCount>0%
+      \ifnum\sl@Casualties>0%
+        \advance\sl@WarningCount-1%
+        \PackageWarningNoLine{silence}{%
+        There were \the\sl@WarningCount\space warning(s)
+        and \the\sl@ErrorCount\space error(s).\MessageBreak%
+        \ifnum\sl@Casualties=\sl@MessageCount%
+          None survived. This is a violent world%
+        \else%
+          I've killed \the\sl@WarningCasualties\space warning(s)
+          and \the\sl@ErrorCasualties\space error(s)%
+        \fi}%
+      \fi%
+    \fi%
+  \fi}
+
+\makeatother
+\endinput
+%%
+%% End of file `silence.sty'.
diff --git a/Master/tlpkg/bin/tlpkg-ctan-check b/Master/tlpkg/bin/tlpkg-ctan-check
index 81609aa7107..f48d9ee7991 100755
--- a/Master/tlpkg/bin/tlpkg-ctan-check
+++ b/Master/tlpkg/bin/tlpkg-ctan-check
@@ -201,7 +201,7 @@ my @WorkingTLP = qw(
           sfmath sgame shadbox shapepar
           shipunov shorttoc show2e showdim showexpl showlabels shuffle
           SIstyle SIunits
-          sidecap sides siggraph simplecv simplewick siunitx
+          sidecap sides siggraph silence simplecv simplewick siunitx
           skak skaknew slantsc slideshow smalltableof smartref smflatex
           snapshot songbook sort-by-letters soul spanish-mx sparklines spie
           splines splitbib splitindex spotcolor sprite srcltx sseq
diff --git a/Master/tlpkg/tlpsrc/silence.tlpsrc b/Master/tlpkg/tlpsrc/silence.tlpsrc
new file mode 100644
index 00000000000..9314dc3a02e
--- /dev/null
+++ b/Master/tlpkg/tlpsrc/silence.tlpsrc
@@ -0,0 +1,2 @@
+name silence
+category Package