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%D \module
%D   [       file=t-correspondence,
%D        version=2009.04.27,
%D          title=\CONTEXT\ User Module,
%D       subtitle=Correspondence,
%D         author=Wolfgang Schuster,
%D           date=\currentdate,
%D      copyright=Wolfgang Schuster,
%D          email=schuster.wolfgang@googlemail.com,
%D        license=Public Domain]

\unprotect

% For MkII users only

\startconstants            all
                     head: head
                     foot: foot
                  topmark: topmark
                  botmark: botmark
                  cutmark: cutmark
                  endmark: endmark
                 usermark: usermark
                 foldmark: foldmark
                extension: extension
                interface: interface
          backgroundimage: backgroundimage
               whitespace: whitespace
                 nexthead: nexthead
                 lefthead: lefthead
                righthead: righthead
                 nextfoot: nextfoot
                 leftfoot: leftfoot
                rightfoot: rightfoot
                  content: content
              backaddress: backaddress
                 optimize: optimize
                  opening: opening
                  closing: closing
                signature: signature
                 dispatch: dispatch
               appendices: appendices
              fromaddress: fromaddress
                 frombank: frombank
                 frommail: frommail
                  fromfax: fromfax
                 fromlogo: fromlogo
                 fromname: fromname
                fromphone: fromphone
                  fromurl: fromurl
                   toname: toname
                toaddress: toaddress
                enclosure: enclosure
                     copy: copy
                       ps: ps
               postscript: postscript
                attention: attention
             distribution: distribution
               salutation: salutation
                addressee: addressee
                   prefix: prefix
                   suffix: suffix
                 initials: initials
               formalname: formalname
             informalname: informalname
                  yourref: yourref
                 yourmail: yourmail
                    myref: myref
                   mymail: mymail
                 customer: customer
                  invoice: invoice
                  subject: subject
                       cc: cc
                enclosure: enclosure
                     encl: encl
                    phone: phone
                      fax: fax
                    email: email
                      url: url
                     bank: bank
                     name: name
                     room: room
                yourorder: yourorder
               ourinvoice: ourinvoice
                rulewidth: rulewidth
                fromalign: fromalign
                 fromrule: fromrule
\stopconstants

\startvariables            all
               secondpage: secondpage
                     foot: foot
                  topmark: topmark
                  botmark: botmark
                  cutmark: cutmark
                  endmark: endmark
                   option: option
                 foldmark: foldmark
                 usermark: usermark
                    layer: layer
                firsthead: firsthead
                 nexthead: nexthead
                 lefthead: lefthead
                righthead: righthead
                firstfoot: firstfoot
                 nextfoot: nextfoot
                 leftfoot: leftfoot
                rightfoot: rightfoot
                   layout: layout
                    place: place
               initialize: initialize
                   finish: finish
                 sequence: sequence
                    style: style
                extension: extension
                interface: interface
                   resume: resume
                   letter: letter
              backaddress: backaddress
                reference: reference
                 location: location
                  address: address
                  opening: opening
                  closing: closing
               letternext: letternext
               lettermain: lettermain
                  special: special
                 notation: notation
                   inside: inside
                 optimize: optimize
                     file: file
                        e: e
                     data: data
                   sender: sender
                 dispatch: dispatch
                enclosure: enclosure
                     copy: copy
                  nobreak: nobreak
                  endgraf: endgraf
                     memo: memo
                addressee: addressee
                   french: french
               simplified: simplified
                fullblock: fullblock
                  hanging: hanging
                 modified: modified
                semiblock: semiblock
                  contact: contact
                   handle: handle
                   casual: casual
                  classic: classic
                    knuth: knuth
                firstname: firstname
               familyname: familyname
                   street: street
                     town: town
                   mobile: mobile
                    phone: phone
                      fax: fax
                    email: email
                     info: info
           correspondence: correspondence
\stopvariables

\startelements             all
                      set: set
                    value: value
                  complex: complex
                   simple: simple
                      use: use
                   define: define
                    flush: flush
\stopelements

% Placeholders for the messages:
%
% 1: letter|resume / interface|style|extension / filename
% 2: letter|resume / interface|style|extension / filename
% 3: ‹number› / ‹number›
% 4: ‹file› / ‹version›

\definemessageconstant {correspondence}

\startmessages all library: correspondence
        title: correspondence
            1: loading -- -- --
            2: -- -- -- not found
            3: correspage set -- processed (size --)
            4: --: --
\stopmessages

%D Page numbering

\def\????cn{@@@@cn}

\definesystemconstant {correspage}

\definetwopasslist\s!correspage

\definenumber[\s!correspage]

\newcount\correspageno
\newif\ifresettingcorrespagenumber

\def\newnofcorrespages{0}
\def\nofcorrespages   {0}

\def\savenofcorrespages
  {\showmessage\m!correspondence{3}{\newnofcorrespages,\the\correspageno}%
   \immediatesavetwopassdata{\s!correspage}{\newnofcorrespages}{\the\correspageno}}

\def\numberofcorrespages
  {\nofcorrespages}

\def\correspagenumber
  {\the\correspageno}

\appendtoks\savenofcorrespages\to\everybye

\def\setupcorrespagenumber
  {\dosingleargument\dosetupcorrespagenumber}

\def\dosetupcorrespagenumber[#1]%
  {\doifelse{#1}\v!reset
     {\resetcorrespagenumber}
     {\getparameters[\????cn][#1]}}

\def\resetcorrespagenumber
  {\global\resettingcorrespagenumbertrue}

\def\setcorrespagenumbers
  {\iftwopassdatafound
     \xdef\nofcorrespages{\twopassdata}%
   \else
     \xdef\nofcorrespages{0}%
   \fi}

\def\gotonextcorrespage
  {\ifresettingcorrespagenumber
     \resetnumber[\s!correspage]%
     \global\resettingcorrespagenumberfalse
   \fi
   \xdef\oldcorrespage{\the\correspageno}%
   \incrementnumber[\s!correspage]%
   \global\correspageno\rawnumber[\s!correspage]\relax
   \ifnum\correspageno=\plusone
     \gettwopassdata\s!correspage
     \setcorrespagenumbers
     \ifnum\oldcorrespage>\zerocount
       \showmessage\m!correspondence{3}{\newnofcorrespages,\oldcorrespage}%
       \immediatesavetwopassdata{\s!correspage}{\newnofcorrespages}{\oldcorrespage}%
     \fi
     \doglobal\increment\newnofcorrespages\relax
   \fi}

\appendtoks\gotonextcorrespage\to\beforeeverypage

%D Setup command for the styles

\def\definecorrespondencesetup[#1][#2][#3]%
  {\setvalue{\e!setup#1\e!endsetup}{\doquintupleempty\dosetupcorrespondencestyle[#2][#3]}}

\def\dosetupcorrespondencestyle[#1][#2][#3][#4][#5]%
  {\iffifthargument
     \dodosetupcorrespondencelayer[#1][#2][#3][#4][#5]%
   \else\iffourthargument
     \dodosetupcorrespondencestyle[#1][#2][#3][#4]%
   \else
     \dosetupcorrespondenceoption[][#2][\v!option][#3]%
   \fi\fi}

\def\dodosetupcorrespondencestyle[#1][#2][#3][#4]%
  {\def\dododosetupcorrespondencestyle##1%
     {\csname dosetupcorrespondence\ifcsname#1:#2:##1\endcsname
        \csname#1:#2:##1\endcsname
      \else
        \v!option
      \fi\endcsname[#1][#2][##1][#4]}%
   \processcommalist[#3]\dododosetupcorrespondencestyle}

\def\dosetupcorrespondenceoption[#1][#2][#3][#4]%
  {\getparameters[#2#3][#4]}

\def\dosetupcorrespondencelayout[#1][#2][#3][#4]%
  {\definelayout[#1#3][#4]}

\def\dosetupcorrespondencesection[#1][#2][#3][#4]%
  {\getparameters[#2#3][#4]}

\def\dosetupcorrespondencedescription[#1][#2][#3][#4]%
  {\getparameters[#2#3][#4]}

\def\dosetupcorrespondencelayer[#1][#2][#3][#4]%
  {\dodosetupcorrespondencelayer[#1][#2][#3][\v!layer,\v!frame,\v!option][#4]}

\def\dodosetupcorrespondencelayer[#1][#2][#3][#4][#5]%
  {\def\dododosetupcorrespondencelayer##1%
     {\def\dodododosetupcorrespondencelayer####1%
        {\ifcsname dosetupcorrespondencelayer####1\endcsname
           \@EA\@EA\csname dosetupcorrespondencelayer####1\endcsname
         \else
           \@EA\dosetupcorrespondencelayeroption
         \fi[#1][#2][##1][#5]}%
      \processcommalist[#4]\dodododosetupcorrespondencelayer}%
   \processcommalist[#3]\dododosetupcorrespondencelayer}

\def\dosetupcorrespondencelayerlayer[#1][#2][#3][#4]%
  {\setuplayer[#1:#3][#4]%
   \getparameters[#2#3\v!layer][#4]}

\def\dosetupcorrespondencelayerframe[#1][#2][#3][#4]%
  {\setuplocalframed[#2#3\v!frame][#4]}

\def\dosetupcorrespondencelayeroption[#1][#2][#3][#4]%
  {\getparameters[#2#3][#4]}

%D Setup command for the values

\def\definecorrespondencevalue
  {\dodoubleargument\dodefinecorrespondencevalue}

\def\dodefinecorrespondencevalue[#1][#2]%
  {\setvalue{\e!setup#1\e!endsetup}{\dotripleempty\docorrespondencesetup[#2]}%
   \@EA\definecomplexorsimple\csname\e!set#1\e!value\endcsname
   \setvalue{\e!complex\e!set#1\e!value}[##1]##2{\setvalue{#2##1}{##2}}%
   \setvalue{\e!simple \e!set#1\e!value}##1##2{\setvalue{#2##1}{##2}}}

\def\docorrespondencesetup[#1][#2][#3]%
  {\doifelsenothing{#3}
     {\getparameters[#1][#2]}
     {\def\dodocorrespondencesetup##1%
        {\getparameters[#1##1][#3]}%
      \processcommalist[#2]\dodocorrespondencesetup}}

%D Tests

\long\def\doifcorrespondencevalue#1#2%
  {\ifcsname#1#2\endcsname
     \edef\!!stringa{\csname#1#2\endcsname}%
     \ifx\!!stringa\empty
       \@EAEAEA\gobbleoneargument
     \else
       \@EAEAEA\firstofoneargument
     \fi
   \else
     \@EA\gobbleoneargument
   \fi}

\long\def\doifelsecorrespondencevalue#1#2%
  {\ifcsname#1#2\endcsname
     \edef\!!stringa{\csname#1#2\endcsname}%
     \ifx\!!stringa\empty
       \@EAEAEA\secondoftwoarguments
     \else
       \@EAEAEA\firstoftwoarguments
     \fi
   \else
     \@EA\secondoftwoarguments
   \fi}

\long\def\doifcorrespondencestylevalue#1#2#3%
  {\ifcsname#1#2#3\endcsname
     \edef\!!stringa{\csname#1#2#3\endcsname}%
     \ifx\!!stringa\empty
       \@EAEAEA\gobbleoneargument
     \else
       \@EAEAEA\firstofoneargument
     \fi
   \else
     \@EA\firstofoneargument
   \fi}

\long\def\doifelsecorrespondencestylevalue#1#2#3%
  {\ifcsname#1#2#3\endcsname
     \edef\!!stringa{\csname#1#2#3\endcsname}%
     \ifx\!!stringa\empty
       \@EAEAEA\secondoftwoarguments
     \else
       \@EAEAEA\firstoftwoarguments
     \fi
   \else
     \@EA\secondoftwoarguments
   \fi}

\def\correspondencestylevalue#1#2#3%
  {\csname#1#2#3\endcsname}

%D External files

\def\definecorrespondencefile[#1][#2][#3]%
  {\setvalue{\e!use#1#2}[##1]{\usecorrespondencefile[#1][#2][#3][##1]}}

\def\usecorrespondencefile[#1][#2][#3][#4]%
  {\def\dousecorrespondencefile##1%
     {\readfile{##1.#3}
        {\showmessage\m!correspondence{1}{#1,#2,##1.#3}}
        {\showmessage\m!correspondence{2}{#1,#2,##1.#3}}}%
   \processcommacommand[#4]\dousecorrespondencefile}

%D Layers

\def\definecorrespondencelayer[#1][#2]%
  {\setvalue{\s!do\e!define#1\v!layer}{\dodefinecorrespondencelayer[#1][#2]}%
   \setvalue{\s!do\e!set   #1\v!layer}{\dosetcorrespondencelayer   [#1][#2]}}

\def\dodefinecorrespondencelayer[#1][#2][#3]%
  {\def\dodododefinecorrespondencelayer##1{\dododefinecorrespondencelayer[#1][#2][##1]}%
   \processaction
     [#3]
     [\v!foldmark=>{\processcommacommand[\csname#1!list!marking\endcsname]\dodododefinecorrespondencelayer},
        \v!header=>{\processcommacommand[\csname#1!list!header\endcsname ]\dodododefinecorrespondencelayer},
        \v!footer=>{\processcommacommand[\csname#1!list!footer\endcsname ]\dodododefinecorrespondencelayer},
       \s!unknown=>{\dododefinecorrespondencelayer[#1][#2][#3]}]}

\def\dododefinecorrespondencelayer[#1][#2][#3]%
  {\letvalue{#2\v!option#3}\v!yes
   \doifundefined{#1:#2:#3}
     {\letvalue{#1:#2:#3}\v!layer
      \addvalue{#1!list!layers}{#3}}%
   \presetlocalframed[#2#3\v!frame]%
   \definelayer
     [#1:#3]
     [\c!width=\paperwidth,
      \c!height=\paperheight]%
   \dodosetupcorrespondencelayer
     [#1][#2][#3][\v!option]%
     [\c!state=\v!stop,
      \c!symbol=,
      \c!list=,
      \c!alternative=\v!a,
      \c!rule=\v!off,
      \c!rulethickness=\linewidth,
      \c!separator=\crlf,
      \c!offset=\zeropoint,
      \c!spacebefore=\zeropoint,
      \c!spaceafter=\zeropoint,
      \c!leftmargin=\zeropoint,
      \c!rightmargin=\zeropoint]%
   \dodosetupcorrespondencelayer
     [#1][#2][#3][\v!frame]%
     [\c!frame=\v!off,
      \c!align=\v!right,
      \c!offset=\zeropoint,
      \c!strut=\v!yes]%
   \dodosetupcorrespondencelayer
     [#1][#2][#3][\v!layer]%
     [\c!state=\v!start,
      \c!offset=\zeropoint,
      \c!preset=\v!left\v!top]}

\def\dosetcorrespondencelayer[#1][#2][#3]%
  {\doifelsecorrespondencestylevalue{#2}{#3}\c!symbol
     {\dodosetcorrespondencelayer[#1][#2][#3][\correspondencestylevalue{#2}{#3}\c!symbol]}
     {\dodosetcorrespondencelayer[#1][#2][#3][\directsetup{#1:#3}]}}

\def\dodosetcorrespondencelayer[#1][#2][#3][#4]%
  {\setlayer[#1:#3]
     {\localframed[#2#3\v!frame]
        {\edef\currentcorrespondenceelement{#3}%
         \doadaptleftskip {\correspondencestylevalue{#2}{#3}\c!leftmargin }%
         \doadaptrightskip{\correspondencestylevalue{#2}{#3}\c!rightmargin}%
         \doattributes{#2#3}\c!style\c!color{#4}}}}

\def\dodosetheaderfooterlayer#1{\csname @@headfoot@@#1\endcsname}

\setvalue{@@headfoot@@\v!start    }{\!!doneatrue            }
\setvalue{@@headfoot@@\v!stop     }{\!!doneafalse           }
\setvalue{@@headfoot@@\v!first    }{\!!doneatrue            }
\setvalue{@@headfoot@@\v!next     }{\!!donebtrue\!!donectrue}
\setvalue{@@headfoot@@\v!left     }{\!!donebtrue            }
\setvalue{@@headfoot@@\v!right    }{\!!donectrue            }
\setvalue{@@headfoot@@\v!leftpage }{\!!donebtrue            }
\setvalue{@@headfoot@@\v!rightpage}{\!!donectrue            }
\setvalue{@@headfoot@@\v!page     }{\!!donedtrue            }
\setvalue{@@headfoot@@\v!subpage  }{\!!donedfalse           }

% \def\dosetheaderfooterlayer[#1][#2][#3]%
%   {\!!doneafalse % first page
%    \!!donebfalse % even numbered pages
%    \!!donecfalse % odd numbered pages
%    \!!donedfalse % real pagenumber
%    \processcommacommand[\csname#2#3\c!state\endcsname]\dodosetheaderfooterlayer
%    \doifnotvalue{#2#3\v!layer\c!state}\v!stop{\setuplayer[#1:#3][\c!state=\v!start]}%
%    \ifnum\if!!doned\pagenumber\else\subpagenumber\fi=\plusone
%      \if!!donea\dosetcorrespondencelayer[#1][#2][#3]\fi
%    \else
%      \ifodd\if!!doned\pagenumber\else\subpagenumber\fi
%        \if!!donec\dosetcorrespondencelayer[#1][#2][#3]\fi
%      \else
%        \if!!doneb\dosetcorrespondencelayer[#1][#2][#3]\fi
%    \fi\fi}

% Alternative version of the macro above for the experimental
% interface because \subpagenumber can't be used in \ifnum.

\def\dosetheaderfooterlayer[#1][#2][#3]%
  {\!!doneafalse % first page
   \!!donebfalse % even numbered pages
   \!!donecfalse % odd numbered pages
   \!!donedfalse % real pagenumber
   \processcommacommand[\csname#2#3\c!state\endcsname]\dodosetheaderfooterlayer
   \doifnotvalue{#2#3\v!layer\c!state}\v!stop{\setuplayer[#1:#3][\c!state=\v!start]}%
   \ifnum\if!!doned\pagenumber\else\correspagenumber\fi=\plusone
     \if!!donea\dosetcorrespondencelayer[#1][#2][#3]\fi
   \else
     \ifodd\if!!doned\pagenumber\else\correspagenumber\fi
       \if!!donec\dosetcorrespondencelayer[#1][#2][#3]\fi
     \else
       \if!!doneb\dosetcorrespondencelayer[#1][#2][#3]\fi
   \fi\fi}

%D Sections

\def\definecorrespondencesection[#1][#2]%
  {\setvalue{\s!do\e!define#1\v!section}{\dodefinecorrespondencesection[#1][#2]}%
   \setvalue{\s!do\e!set   #1\v!section}{\dosetcorrespondencesection   [#1][#2]}}

\def\dodefinecorrespondencesection[#1][#2][#3]%
  {\letvalue{#2\v!option#3}\v!yes
   \doifundefined{#1:#2:#3}
     {\letvalue{#1:#2:#3}\v!section
      \addvalue{#1!list!sections}{#3}}%
   \getparameters
     [#2#3]
     [\c!before=,
      \c!after=,
      \c!inbetween=,
      \c!align=,
      \c!leftmargin=\zeropoint,
      \c!rightmargin=\zeropoint,
      \c!alternative=\v!a,
      \c!separator=\crlf,
      \c!optimize=\v!no,
      \c!command=,
      \c!style=,
      \c!color=]}

\def\dosetcorrespondencesection[#1][#2][#3]%
  {\begingroup
   \doifelsecorrespondencestylevalue{#2}{#3}\c!before
     {\correspondencestylevalue{#2}{#3}\c!before}
      \endgraf
   \doadaptleftskip {\correspondencestylevalue{#2}{#3}\c!leftmargin}%
   \doadaptrightskip{\correspondencestylevalue{#2}{#3}\c!rightmargin}%
   \doifcorrespondencestylevalue{#2}{#3}\c!align
     {\setupalign[\correspondencestylevalue{#2}{#3}\c!align]}%
   \dostartattributes{#2#3}\c!style\c!color\empty
     \correspondencestylevalue{#2}{#3}\c!command{\directsetup{#1:#3}}%
   \dostopattributes
   \doifcorrespondencestylevalue{#2}{#3}\c!after
     {\endgraf\correspondencestylevalue{#2}{#3}\c!after}
      \endgraf
   \endgroup}

%D Descriptions

\def\definecorrespondencedescription[#1][#2]%
  {\setvalue{\s!do\e!define#1\v!description}{\dodefinecorrespondencedescription[#1][#2]}%
   \setvalue{\s!do\e!set   #1\v!description}{\dosetcorrespondencedescription   [#1][#2]}%
   \setvalue{\s!do\e!flush #1\v!description}{\doflushcorrespondencedescription [#1][#2]}}

\def\dodefinecorrespondencedescription[#1][#2][#3]%
  {\letvalue{#2\v!option#3}\v!yes
   \doifundefined{#1:#2:#3}{\letvalue{#1:#2:#3}\v!description}%
   \getparameters
     [#2#3]
     [\c!location=\v!left,
      \c!inbetween=\nowhitespace,
      \c!before=\blank,
      \c!after=\blank,
      \c!width=\v!broad,
      \c!headstyle=,
      \c!headcolor=,
      \c!distance=\zeropoint]}

\def\dosetcorrespondencedescription[#1][#2][#3]%
  {\bgroup
   \doifelsecorrespondencestylevalue{#2}{#3}\c!before
     {\correspondencestylevalue{#2}{#3}\c!before}
      \endgraf
   \scratchdimen\zeropoint
   \setbox\scratchbox\hbox{\doattributes{#2#3}\c!headstyle\c!headcolor{\labeltext{#1:#3}}}%
   \doifelse{\correspondencestylevalue{#2}{#3}\c!width}\v!broad
     {\ifdim\wd\scratchbox>\zeropoint
        \scratchdimen\dimexpr\wd\scratchbox+1em\relax
      \fi}
     {\doifelse{\correspondencestylevalue{#2}{#3}\c!width}\v!fit
        {\if\wd\scratchbox>\zeropoint
           \scratchdimen\dimexpr\wd\scratchbox+\correspondencestylevalue{#2}{#3}\c!distance\relax
         \fi}
        {\scratchdimen\dimexpr\correspondencestylevalue{#2}{#3}\c!width+\correspondencestylevalue{#2}{#3}\c!distance\relax}}%
   \executeifdefined{@@description@@\correspondencestylevalue{#2}{#3}\c!location}\gobblethreearguments{#1}{#2}{#3}%
   \doifelsecorrespondencestylevalue{#2}{#3}\c!after
     {\endgraf\correspondencestylevalue{#2}{#3}\c!after}
      \endgraf
   \egroup}

\setvalue{@@description@@\v!left}#1#2#3%
  {\EveryPar{\hangindent\scratchdimen\hangafter\zerocount}%
   \setbox\scratchbox\hbox\!!to\scratchdimen{\box\scratchbox\hss}%
   \noindent\llap{\box\scratchbox}\directsetup{#1:#3}}

\setvalue{@@description@@\v!right}#1#2#3%
  {\EveryPar{\hangindent-\scratchdimen\hangafter\zerocount}%
   \setbox\scratchbox\hbox\!!to\scratchdimen{\hss\box\scratchbox}%
   \setbox\scratchbox\hbox\!!to\!!zeropoint {\hskip\dimexpr\hsize-\scratchdimen\relax\box\scratchbox\hss}%
   \noindent\rlap{\box\scratchbox}\directsetup{#1:#3}}

\setvalue{@@description@@\v!top}#1#2#3%
  {\box\scratchbox\par
   \nobreak
   \doifcorrespondencestylevalue{#2}{#3}\c!inbetween{\correspondencestylevalue{#2}{#3}\c!inbetween}%
   \nobreak
   \directsetup{#1:#3}}

\setvalue{@@description@@\v!text}#1#2#3%
  {\noindent\box\scratchbox\directsetup{#1:#3}}

\def\doflushcorrespondencedescription[#1][#2]%
  {\def\dodoflushcorrespondencedescription##1%
     {\doif{\correspondencestylevalue{#2}\v!option{##1}}\v!yes{\dosetcorrespondencedescription[#1][#2][##1]}}%
   \processcommacommand[\csname#1!list!descriptions\endcsname]\dodoflushcorrespondencedescription}

%D Commands to define named elements for header, footer etc. and use them,
%D clone them or delete their content.

\def\definecorrespondenceelement  [#1]#2[#3]#4[#5]#6{\setvalue{#1:#3:#5}{#6}}
\def\resetcorrespondenceelement     [#1]#2[#3]#4[#5]{\resetvalue{#1:#3:#5}}
\def\copycorrespondenceelement[#1]#2[#3]#4[#5]#6[#7]{\copycsname#1:#3:#5\endcsname\csname#1:#3:#7\endcsname}
\def\correspondenceelement          [#1]#2[#3]#4[#5]{\csname#1:#3:#5\endcsname}

\protect \endinput