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\LeadsheetsExplLibrary{templates}
{2014/08/10 template mechanism for song titles and verses}
\msg_new:nnn {leadsheets} {unknown-template}
{ Unknown~ #1~ template~ `#2'~ \msg_line_context: }
\tl_new:N \l__leadsheets_songtitle_template_tl
\prop_new:N \l__leadsheets_songtitle_template_prop
\NewDocumentCommand \songtitle {} { \leadsheets_songtitle: }
% the following is shamelessly adapted from the `needspace' package by
% Peter Wilson and Herries Press:
\cs_new:Npn \leadsheets_needspace:n #1
{
\group_begin:
\dim_set:Nn \l__leadsheets_tmpa_dim { #1 }
\skip_vertical:n { \c_zero_dim + \l__leadsheets_tmpa_dim }
\tex_penalty:D -100
\skip_vertical:n { \c_zero_dim - \l__leadsheets_tmpa_dim }
\skip_vertical:N \l__leadsheets_tmpa_dim
\tex_penalty:D 9999
\skip_vertical:n { - \l__leadsheets_tmpa_dim }
\skip_vertical:N \c_zero_dim
\group_end:
}
\cs_new_protected:Npn \leadsheets_songtitle:
{
\leadsheets_use_songtitle_template:V \l__leadsheets_songtitle_template_tl
\leadsheets_needspace:n { 3\baselineskip }
}
\cs_new_protected:Npn \leadsheets_use_songtitle_template:n #1
{
\prop_get:NnNTF \l__leadsheets_songtitle_template_prop
{#1}
\l__leadsheets_tmpa_tl
{ \l__leadsheets_tmpa_tl }
{ \msg_error:nnnn {leadsheets} {unknown-template} {songtitle} {#1} }
}
\cs_generate_variant:Nn \leadsheets_use_songtitle_template:n { V }
\cs_new_protected:Npn \leadsheets_define_songtitle_template:nn #1#2
{ \prop_put:Nnn \l__leadsheets_songtitle_template_prop {#1} {#2} }
\NewDocumentCommand \definesongtitletemplate {m+m}
{ \leadsheets_define_songtitle_template:nn {#1} {#2} }
\NewDocumentCommand \expandcode {+m} { \use:x {#1} }
% verse-type templates
\prop_new:N \l__leadsheets_verse_begin_template_prop
\prop_new:N \l__leadsheets_verse_end_template_prop
% #1: template name
% #2: begin code
% #3: end code
\cs_new_protected:Npn \leadsheets_define_verse_template:nnn #1#2#3
{
\prop_put:Nnn \l__leadsheets_verse_begin_template_prop {#1} {#2}
\prop_put:Nnn \l__leadsheets_verse_end_template_prop {#1} {#3}
}
\cs_new_protected:Npn \leadsheets_use_verse_template:nn #1#2
{
\exp_args:Nnc
\prop_get:cVNTF {l__leadsheets_verse_#1_template_prop}
{l__leadsheets_#2_template_tl}
\l__leadsheets_tmpa_tl
{ \tl_use:N \l__leadsheets_tmpa_tl }
{
\msg_error:nnxx {leadsheets} {unknown-template}
{verse-type}
{\use:c{l__leadsheets_#2_template_tl}}
}
}
\DeclareExpandableDocumentCommand \ifobeylines {}
{ \bool_if:NTF \l__leadsheets_obey_lines_bool }
\NewDocumentCommand \defineversetypetemplate {m+m+m}
{ \leadsheets_define_verse_template:nnn {#1} {#2} {#3} }
\endinput
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