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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} }
+
+% ----------------------------------------------------------------------------