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+\LeadsheetsExplLibrary{chords}{2014/08/10 printing chords}
+
+\msg_new:nnn {leadsheets} {no-chords}
+ { No~ more~ chords~ left~ for~ verse~ type~ `#1'~ \msg_line_context: }
+
+\tl_new:N \l__leadsheets_current_chord_tl
+\tl_new:N \l__leadsheets_chord_stack_alignment_tl
+\tl_set:Nn \l__leadsheets_chord_stack_alignment_tl {c}
+
+\bool_new:N \l__leadsheets_smash_chords_bool
+\bool_new:N \g__leadsheets_smash_next_chord_bool
+\bool_new:N \l__leadsheets_chord_gobble_after_bool
+\bool_new:N \l__leadsheets_record_chords_bool
+\bool_new:N \l__leadsheets_chord_print_bool
+\bool_set_true:N \l__leadsheets_chord_print_bool
+
+\prop_new:N \g__leadsheets_chords_sequences_prop
+
+\seq_new:N \l__leadsheets_chords_sequences_seq
+
+\dim_new:N \l__leadsheets_empty_chord_dim
+\dim_set:Nn \l__leadsheets_empty_chord_dim {1em}
+
+\cs_new:Npn \leadsheets_chord_print:n #1 {#1}
+\cs_generate_variant:Nn \leadsheets_chord_print:n {V}
+
+\cs_new_protected:Npn \leadsheets_chord:nnn #1#2#3
+ {
+ \leadsheets_if_record_chords:T
+ { \seq_put_right:Nn \l__leadsheets_chords_sequences_seq { {#3} } }
+ \leadsheets_set_chord:nnn
+ {#1}
+ {#2}
+ { \leadsheets_chord_write:n {#3} }
+ }
+
+\cs_new_protected:Npn \leadsheets_set_chord:nnn #1#2#3
+ {
+ \bool_if:NTF #1
+ { \bool_set_true:N \l__leadsheets_chord_gobble_after_bool }
+ { \bool_set_false:N \l__leadsheets_chord_gobble_after_bool }
+ \bool_if:NT #2
+ { \bool_set_true:N \g__leadsheets_smash_next_chord_bool }
+ \__leadsheets_set_chord:nwn {#3}
+ }
+
+\cs_new_protected:Npn \__leadsheets_set_chord:nwn #1#2~#3
+ {
+ \leadsheets_place_above:Vnn
+ \l__leadsheets_chord_stack_alignment_tl
+ {#1}
+ {
+ \tl_if_blank:nTF {#2}
+ {\skip_horizontal:N \l__leadsheets_empty_chord_dim}
+ {#2}
+ }
+ \tl_if_blank:nF {#3}
+ { \bool_if:NF \l__leadsheets_chord_gobble_after_bool {\c_space_tl} }
+ #3
+ }
+
+\cs_new_protected:Npn \leadsheets_chord_write:n #1
+ {
+% \bool_if:NT \l__leadsheets_chord_print_bool
+% {
+ \tl_set:Nn \l__leadsheets_current_chord_tl {#1}
+ \bool_if:nT
+ {
+ \leadsheets_if_property_p:Vn \l_leadsheets_current_song_id_tl {key}
+ &&
+ ( \l__leadsheets_transpose_bool || \l__leadsheets_transpose_capo_bool )
+ }
+ {
+ \leadsheets_transpose:xVN
+ { \leadsheets_get_property:Vn \l_leadsheets_current_song_id_tl {key} }
+ \l__leadsheets_transpose_steps_int
+ \l__leadsheets_current_chord_tl
+ }
+ \bool_if:nTF
+ {
+ ! \leadsheets_if_property_p:Vn \l_leadsheets_current_song_id_tl {key}
+ &&
+ ( \l__leadsheets_transpose_bool || \l__leadsheets_transpose_capo_bool )
+ }
+ {
+ \msg_warning:nnV {leadsheets}
+ {transpose-key}
+ \l_leadsheets_current_song_id_tl
+ }
+ \leadsheets_chord_print:V \l__leadsheets_current_chord_tl
+% }
+ }
+\cs_generate_variant:Nn \leadsheets_chord_write:n { V }
+
+\cs_new_protected:Npn \leadsheets_place_above:nnn #1#2#3
+ {
+ \bool_if:NTF \l__leadsheets_chord_print_bool
+ {
+ \group_begin:
+ \leadsheets_ignore_lines:
+ \bool_if:NT \g__leadsheets_smash_next_chord_bool
+ {
+ \bool_set_true:N \l__leadsheets_smash_chords_bool
+ \bool_gset_false:N \g__leadsheets_smash_next_chord_bool
+ }
+ \linespread{1} \selectfont
+ \begin{tabular} [b] {@{}#1@{}}
+ \bool_if:NTF \l__leadsheets_smash_chords_bool
+ {\makebox[0pt][c]{#2}}
+ {#2} \\
+ #3
+ \end{tabular}
+ \group_end:
+ }
+ {#3}
+ }
+\cs_generate_variant:Nn \leadsheets_place_above:nnn { V }
+
+\keys_define:nn {leadsheets}
+ {
+ smash-chords .bool_set:N = \l__leadsheets_smash_chords_bool ,
+ smash-next-chord .bool_set:N = \g__leadsheets_smash_next_chord_bool ,
+ empty-chord-dim .dim_set:N = \l__leadsheets_empty_chord_dim ,
+ remember-chords .bool_set:N = \l__leadsheets_record_chords_bool ,
+ align-chords .tl_set:N = \l__leadsheets_chord_stack_alignment_tl ,
+ chord-cs .code:n =
+ \cs_set_protected:Npn \leadsheets_chord_print:n {#1} ,
+ chord-cs .initial:n = \chordname ,
+ print-chords .bool_set:N = \l__leadsheets_chord_print_bool
+ }
+
+\NewDocumentCommand \chord {st-m} { \leadsheets_chord:nnn {#1} {#2} {#3} }
+
+\NewDocumentCommand \writechord {m}
+ { \leadsheets_chord_write:n {#1} }
+
+% --------------------------------------------------------------------------
+% record changes for a verse and automatically print them in the next:
+\prg_new_conditional:Npnn \leadsheets_if_record_chords: {T,F,TF}
+ {
+ \bool_if:nTF
+ {
+ \l__leadsheets_record_chords_bool &&
+ ! \prop_if_in_p:NV
+ \g__leadsheets_chords_sequences_prop
+ \l_leadsheets_verse_type_tl &&
+ !\l__leadsheets_measuring_bool
+ }
+ { \prg_return_true: }
+ { \prg_return_false: }
+ }
+
+\prg_new_conditional:Npnn \leadsheets_if_recall_chords: {T,F,TF}
+ {
+ \bool_if:nTF
+ {
+ \l__leadsheets_record_chords_bool &&
+ \prop_if_in_p:NV
+ \g__leadsheets_chords_sequences_prop
+ \l_leadsheets_verse_type_tl
+ &&
+ !\l__leadsheets_measuring_bool
+ }
+ { \prg_return_true: }
+ { \prg_return_false: }
+ }
+
+\cs_new:Npn \leadsheets_remember_or_recall_chords:w
+ {
+ \leadsheets_if_recall_chords:TF
+ { \__leadsheets_recall_chord:w }
+ { \chord }
+ }
+
+\cs_new_protected:Npn \leadsheets_recall_chord:nn #1#2
+ {
+ \seq_pop_left:NNF \l__leadsheets_chords_sequences_seq
+ \l__leadsheets_tmpa_tl
+ { \msg_error:nnV {leadsheets} {no-chords} \l_leadsheets_verse_type_tl }
+ \leadsheets_set_chord:nnn
+ {#1}
+ {#2}
+ { \leadsheets_chord_write:V \l__leadsheets_tmpa_tl }
+ }
+
+\NewDocumentCommand \__leadsheets_recall_chord:w {st-}
+ { \leadsheets_recall_chord:nn {#1} {#2} }
+
+\endinput