diff options
Diffstat (limited to 'Master/texmf-dist/doc/latex/base/ltnews22.tex')
-rw-r--r-- | Master/texmf-dist/doc/latex/base/ltnews22.tex | 50 |
1 files changed, 28 insertions, 22 deletions
diff --git a/Master/texmf-dist/doc/latex/base/ltnews22.tex b/Master/texmf-dist/doc/latex/base/ltnews22.tex index e73fb4b7c46..7551616154d 100644 --- a/Master/texmf-dist/doc/latex/base/ltnews22.tex +++ b/Master/texmf-dist/doc/latex/base/ltnews22.tex @@ -40,6 +40,12 @@ \publicationissue{22} +\providecommand\pkg[1]{\texttt{#1}} +\providecommand\cls[1]{\texttt{#1}} +\providecommand\option[1]{\texttt{#1}} +\providecommand\env[1]{\texttt{#1}} +\providecommand\file[1]{\texttt{#1}} + \begin{document} \maketitle @@ -49,29 +55,29 @@ \subsection{Introduction} For some years we have supplied bug fixes to the \LaTeXe\ kernel via the -\textsf{fixltx2e} package. This +\pkg{fixltx2e} package. This kept the kernel stable, but at the expense of meaning that most users did not benefit from bug fixes, and that some compromises which were made to save space in the machines of the time are still affecting most users today. In this release we have started a new update policy. All the fixes previously -available via \textsf{fixltx2e} are now enabled \emph{by default} in the +available via \pkg{fixltx2e} are now enabled \emph{by default} in the format, as are some further extensions for extended \TeX\ engines, \eTeX, \hologo{XeTeX} and \hologo{LuaTeX}. Compatibility and stability are still important considerations, and while most users will not notice these -improvements, or will want to benefit from them, a new \textsf{latexrelease} +improvements, or will want to benefit from them, a new \pkg{latexrelease} package is provided that will revert all the changes and re-instate the definitions from earlier releases. The package can also be used with older releases to effectively \emph{update} the kernel to be equivalent to this 2015 release. -A new document, \textsf{latexchanges}, is distributed with the release +A new document, \file{latexchanges}, is distributed with the release that documents all the changes to documented commands since the 2014 \LaTeX\ release, and will be updated in future releases if further changes have been made. -\subsection{The \textsf{latexrelease} package} +\subsection{The \pkg{latexrelease} package} As noted above a new package is available to manage differences between \LaTeX\ releases. If you wish to revert all changes back to the definitions as they @@ -86,21 +92,21 @@ against possible future changes, you may start your document \RequirePackage[2015/01/01]{latexrelease} \documentclass{article} \end{verbatim} -Then the version of \textsf{latexrelease} distributed with any future \LaTeX\ +Then the version of \pkg{latexrelease} distributed with any future \LaTeX\ release will revert any changes made in that format, and revert to the definitions as they where at the beginning of 2015. If you wish to share a document using the latest features with a user restricted to using an older -format, you may use the form above and make the \textsf{latexrelease} package +format, you may use the form above and make the \pkg{latexrelease} package available on the older installation. The package will then update the format definitions as needed to enable the older format to work as if dated on the date specified in the package option. \subsection{The \cs{IncludeInRelease} command} -The mechanism used in the \textsf{latexrelease} package is available for use in -package code. If in your \textsf{zzz} package you have +The mechanism used in the \pkg{latexrelease} package is available for use in +package code. If in your \pkg{zzz} package you have \begin{verbatim} \RequirePackage{latexrelease} \IncludeInRelease{2015/06/01} @@ -116,7 +122,7 @@ then in a document using a format dated 2015/06/01 or later, the ``new code'' will be used, and for documents being processed with an older format, the ``original'' code will be used. Note the format date here may be the original format date as shown at the start of every \LaTeX\ run, or a format date -specified as a package option to the \textsf{latexrelease} package. +specified as a package option to the \pkg{latexrelease} package. So if the document has \begin{verbatim} @@ -132,7 +138,7 @@ processed with the current format, as the format acts as if dated 2014/05/01. The new concept provides full backward and forward compatibility for the \LaTeX{} format, i.e., with the help of a current -\textsf{latexrelease} package the kernel can emulate all released +\pkg{latexrelease} package the kernel can emulate all released formats (starting with 2014/06/01\footnote{Patching an older format most likely works too, given that the changes in the past have been minimal, though this isn't guaranteed and hasn't been tested.}). @@ -155,10 +161,10 @@ help identifying what release tree to use to achieve perfect accuracy. \section{Updates to the kernel} -\subsection{Updates incorporated from \textsf{fixltx2e}} +\subsection{Updates incorporated from \pkg{fixltx2e}} -The detailed list of changes incorporated from \textsf{fixltx2e} is -available in the new \textsf{latexchanges} document that is +The detailed list of changes incorporated from \pkg{fixltx2e} is +available in the new \file{latexchanges} document that is distributed with this release. The main changes are that $2$-column floats are kept in sequence with one column floats, corrections are made to the \verb|\mark| system to ensure correct page headings in @@ -170,18 +176,18 @@ $2$-column documents, several additional commands are made robust. that allocated registers in the range $0$--$255$. Almost all distributions have for some years used \eTeX\ based formats (or \hologo{XeTeX} or \hologo{LuaTeX}) which have $2^{15}$ registers of each type ($2^{16}$ in the case of -\hologo{LuaTeX}). The \textsf{etex} package has been available to provided an +\hologo{LuaTeX}). The \pkg{etex} package has been available to provided an allocation mechanism for these extended registers but now the format will by default allocate in a range suitable for the engine being used. The new -allocation mechanism is different than the \textsf{etex} package mechanism, and +allocation mechanism is different than the \pkg{etex} package mechanism, and supports \hologo{LuaTeX}'s full range and an allocation mechanism for \LaTeX\ floats as described below. On \eTeX\ based engines, an additional command, \verb|\newmarks| is available -(as with the \textsf{etex} package) that allocates extended \eTeX\ marks, and +(as with the \pkg{etex} package) that allocates extended \eTeX\ marks, and similarly if \hologo{XeTeX} is detected a new command \verb|\newXeTeXintercharclass| is available, this is similar to the command -previously defined in the \texttt{xelatex.ini} file used to build the +previously defined in the \file{xelatex.ini} file used to build the \texttt{xelatex} format. \subsection{Additional \LaTeX{} float storage} @@ -189,7 +195,7 @@ previously defined in the \texttt{xelatex.ini} file used to build the \LaTeX's float placement algorithm needs to store floats (figures and tables) until it finds a suitable page to output them. It allocates $18$ registers for this storage, but this can often be insufficient. - The contributed \textsf{morefloats} package has + The contributed \pkg{morefloats} package has been available to extend this list; however, it also only allocates from the standard range $0$--$255$ so cannot take advantage of the extended registers. The new allocation mechanism in this release incorporates a new command @@ -203,11 +209,11 @@ make many more boxes available to hold floats. The kernel sources now detect the engine being used and adjust definitions accordingly, this reduces the need for the ``\texttt{.ini}'' files used to make -the formats to patch definitions defined in \texttt{latex.ltx}. +the formats to patch definitions defined in \file{latex.ltx}. As noted above the format now includes extended allocation routines. -The distribution includes a file \textsf{unicode-letters.def} derived from the +The distribution includes a file \file{unicode-letters.def} derived from the Unicode Consortium's Unicode Character Data files that details the upper and lower case transformation data for the full Unicode range. This is used to set the \verb|lccode| and \verb|uccode| values if a Unicode engine is being used, @@ -235,7 +241,7 @@ As well as updating the build system, the team have looked again at exactly what gets released to \textsc{ctan}. Taking inspiration from Heiko Oberdiek's \textsf{latex-tds} bundle, the PDF documentation provided now includes hyperlinks where appropriate. This has been done without modifying the sources -such that users without \textsf{hyperref} available can still typeset the +such that users without \pkg{hyperref} available can still typeset the documentation using only the core distribution. At the same time, the release now includes ready-to-install TDS-style zip files. This will be of principal interest to \TeX\ system maintainers, but end users with older machines who |