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% ----------------------------------------------------------------------------
% the XSIM package - verbwrite module
%
% eXercise Sheets IMproved
%
% ----------------------------------------------------------------------------
% Clemens Niederberger
% Web: https://github.com/cgnieder/xsim
% E-Mail: contact@mychemistry.eu
% ----------------------------------------------------------------------------
% Copyright 2017 Clemens Niederberger
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is Clemens Niederberger.
% ----------------------------------------------------------------------------
% If you have any ideas, questions, suggestions or bugs to report, please
% feel free to contact me.
% ----------------------------------------------------------------------------
\XSIMmodule{verbwrite}{write contents of environments verbatim to files}
\xsim_load_modules:n {base}
\iow_new:N \l__file_contents_iow
\tl_new:N \l_xsim_file_begin_tl
\tl_new:N \l_xsim_file_end_tl
\int_new:N \l_xsim_line_gobble_int
\int_zero:N \l_xsim_line_gobble_int
\tl_const:Nx \c__xsim_backslash_char_tl { \cs_to_str:N \\ }
\group_begin:
\char_set_catcode_other:n {37}
\tl_const:Nn \c__xsim_percent_char_tl {%}
\group_end:
% ----------------------------------------------------------------------------
% the `final' option will prevent writing to files:
% #1: write stream
% #2: file name
\cs_new_protected:Npn \__xsim_open_stream:Nn #1#2
{
\file_if_exist:nTF {#2}
{ \xsim_if_final:F { \iow_open:Nn #1 {#2} } }
{
% \g_xsim_final_bool is a global variable; however, if it is true and
% the exercise file doesn't exist, yet, we need to set it locally to
% false in order to ensure that the file is correctly written and the
% stream closed afterwards
\bool_set_false:N \g_xsim_final_bool
\iow_open:Nn #1 {#2}
}
}
% #1: write stream
\cs_new_protected:Npn \__xsim_close_stream:N #1
{ \xsim_if_final:F { \iow_close:N #1 } }
% #1: write stream
% #1: contents
\cs_new_protected:Npn \__xsim_write_to_stream:Nn #1#2
{
\xsim_if_final:F
{
% remove the /one/ space token with catcode 10 that is inserted if
% no options are given to the surrounding environment:
\tl_set:Nn \l__xsim_tmpa_tl {#2}
\tl_remove_once:Nn \l__xsim_tmpa_tl {~}
\int_zero:N \l__xsim_tmpa_int
\int_while_do:nn { \l__xsim_tmpa_int < \l_xsim_line_gobble_int }
{
\int_incr:N \l__xsim_tmpa_int
\tl_set:Nx \l__xsim_tmpa_tl { \tl_tail:N \l__xsim_tmpa_tl }
}
\iow_now:NV #1 \l__xsim_tmpa_tl
}
}
\cs_generate_variant:Nn \__xsim_write_to_stream:Nn {Nx}
\cs_new:Npn \__xsim_tab: { \c_space_tl \c_space_tl }
\cs_new:Npn \__xsim_par: { ^^J ^^J }
% the following is inspired by the definition of the `filecontents'
% environment:
% #1: boolean - if true an active eol needs to be inserted before
% starting to write
% #2: file name
\cs_new_protected:Npn \xsim_file_write_start:nn #1#2
{
% we need to insert an active ^^M if no options are given
% see http://tex.stackexchange.com/q/9035/5049 reasons
\use:nx
{ \__xsim_file_write_start:n {#2} }
{ \bool_if:nF {#1} { \c__xsim_active_eol_tl } }
}
\cs_generate_variant:Nn \xsim_file_write_start:nn {nV}
\group_begin:
\char_set_catcode_active:n {13} % ^^M (carriage return, endlinechar)
\char_set_catcode_active:n {12} % ^^L (form feed)
\char_set_catcode_active:n {9} % ^^I (horizontal tab)
%
\tl_const:Nn \c__xsim_active_eol_tl {^^M} %
%
% #1: file name
\cs_new_protected:Npn \__xsim_file_write_start:n #1 %
{ %
\group_begin: %
\xsim_if_final:TF %
{ \xsim_verbose:x { Not~ (re-)writing~ file~ `#1'. } } %
{ \xsim_verbose:x { (Re-)writing~ file~ `#1'. } } %
\__xsim_open_stream:Nn \l__file_contents_iow {#1} %
\tl_if_blank:VF \l_xsim_file_begin_tl %
{ %
\xsim_if_final:F %
{ %
\iow_now:Nx \l__file_contents_iow %
{ \l_xsim_file_begin_tl } %
} %
} %
\seq_map_inline:Nn \l_char_special_seq %
{ \char_set_catcode_other:N ##1 } %
\int_step_inline:nnnn {128} {1} {255} %
{ \char_set_catcode_letter:n {##1} } %
\tl_set:Nx \l__xsim_tmpa_tl %
{ \c__xsim_backslash_char_tl end \cs_to_str:N \{ \@currenvir \cs_to_str:N \} } %
\use:x %
{ %
\cs_set:cpn {__xsim_tmpa:www} %
####1 \l__xsim_tmpa_tl %
####2 \l__xsim_tmpa_tl %
####3 \exp_not:N \q_stop: %
} %
{ %
\tl_if_blank:nTF {##3} %
{ \__xsim_write_to_stream:Nn \l__file_contents_iow {##1} } %
{ %
\cs_set:Npx \__xsim_M:w { \exp_not:N \end {\@currenvir} } %
\char_set_active_eq:nN {13} \__xsim_M:w %
% the last line is `##1 \end{\@currenvir} ##2':
% \tl_if_blank:nF {##1} %
% { \__xsim_write_to_stream:Nn \l__file_contents_iow {##1} }%
% \tl_if_blank:nF {##2} %
% {}%
} %
^^M %
} %
\char_set_catcode_active:n {13} %
\char_set_catcode_active:n {12} %
\char_set_catcode_active:n {9} %
\cs_set:Npx \__xsim_M:w ##1 ^^M %
{ %
\exp_not:N \__xsim_tmpa:www ##1 %
\l__xsim_tmpa_tl %
\l__xsim_tmpa_tl %
\exp_not:N \q_stop: %
} %
\char_set_active_eq:nN {13} \__xsim_M:w %
\char_set_active_eq:nN {12} \__xsim_par: %
\char_set_active_eq:nN {9} \__xsim_tab: %
} %
\group_end:
\cs_new_protected:Npn \xsim_file_write_stop:
{
\tl_if_blank:VF \l_xsim_file_end_tl
{
\xsim_if_final:F
{
\iow_now:Nx \l__file_contents_iow
{ \l_xsim_file_end_tl }
}
}
\__xsim_close_stream:N \l__file_contents_iow
\group_end:
}
% ----------------------------------------------------------------------------
\NewDocumentCommand \XSIMfilewritestart {sm}
{
\IfBooleanTF {#1}
{ \xsim_file_write_start:nn { \c_false_bool } {#2} }
{ \xsim_file_write_start:nn { \c_true_bool } {#2} }
}
\NewDocumentCommand \XSIMfilewritestop {}
{ \xsim_file_write_stop: }
\NewDocumentCommand \XSIMsetfilebegin {+m}
{ \tl_set:Nn \l_xsim_file_begin_tl {#1} }
\NewDocumentCommand \XSIMsetfileend {+m}
{ \tl_set:Nn \l_xsim_file_end_tl {#1} }
\NewDocumentCommand \XSIMgobblechars {m}
{ \int_set:Nn \l_xsim_line_gobble_int {#1} }
% ----------------------------------------------------------------------------
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