Added lyrics to scores

folkugat_web/services/lilypond.py

@@ -1,12 +1,14 @@
 import asyncio
 import dataclasses
+import itertools
 import os
 import re
 from pathlib import Path
 from typing import Literal
 
 import aiofiles
-from folkugat_web.model.lilypond import RenderError
+from folkugat_web.model.lilypond import (LyricsColumn, LyricsParagraph,
+                                         LyricsText, RenderError)
 from folkugat_web.model.temes import Tema
 from folkugat_web.services import files as files_service
 from folkugat_web.templates import templates
@@ -17,10 +19,15 @@ RenderFormat = Literal["png"] | Literal["pdf"]
 
 
 def source_to_single_score(source: str, tema: Tema) -> str:
+    if tema.lyrics:
+        lyrics_text = build_lyrics(tema.lyrics[0].content)
+    else:
+        lyrics_text = None
     return templates.get_template("lilypond/single_score.ly").render(
         score_beginning=SCORE_BEGINNING,
         score_source=source,
         tema=tema,
+        lyrics_text=lyrics_text,
     )
 
 
@@ -68,3 +75,15 @@ async def render(source: str, fmt: RenderFormat, output_filename: Path | None =
         output_filename = output_filename.with_suffix(".pdf")
 
     return output_filename, []
+
+
+def build_lyrics(text: str, max_cols: int = 2, min_pars: int = 2) -> LyricsText:
+    paragraphs = [LyricsParagraph(lines=par_str.splitlines()) for par_str in text.split("\n\n")]
+    n_cols = next(filter(lambda nc: len(paragraphs) // nc >= min_pars, range(max_cols, 0, -1)), 1)
+    n_long_cols = len(paragraphs) % n_cols
+    pars_per_col = [len(paragraphs) // n_cols + 1] * n_long_cols + [len(paragraphs) // n_cols] * (n_cols - n_long_cols)
+    acc_pars_per_col = [0] + list(itertools.accumulate(pars_per_col))
+    return LyricsText(columns=[
+        LyricsColumn(paragraphs=paragraphs[acc_pars_per_col[i]:acc_pars_per_col[i+1]])
+        for i in range(n_cols)
+    ])