GNU LilyPond – アプリケーション使用方法: 2.5 手動変換

## 2.5 手動変換

理論的には、`convert-ly` のようなプログラムはすべての構文変更を処理できます。 After all, a computer program interprets the old version and the new version, so another computer program can translate one file into another1.

しかしながら、LilyPond プロジェクトの資源には限りがあり、すべての変換を自動化することはできません。以下は既知の問題のリストです。

    1.6->2.0:
     Doesn't always convert figured bass correctly, specifically things like {<
    >}.  Mats' comment on working around this:
       To be able to run convert-ly
       on it, I first replaced all occurrences of '{<' to some dummy like '{#'
       and similarly I replaced '>}' with '&}'.  After the conversion, I could
       then change back from '{ #' to '{ <' and from '& }' to '> }'.
     Doesn't convert all text markup correctly.  In the old markup syntax,
     it was possible to group a number of markup commands together within
    parentheses, e.g.
       -#'((bold italic) "string")
       This will incorrectly be converted into
       -\markup{{\bold italic} "string"}
       instead of the correct
       -\markup{\bold \italic "string"}
    2.0->2.2:
     Doesn't handle \partcombine
     Doesn't do \addlyrics => \lyricsto, this breaks some scores with multiple
    stanzas.
    2.0->2.4:
     \magnify isn't changed to \fontsize.
        - \magnify #m => \fontsize #f, where f = 6ln(m)/ln(2)
     remove-tag isn't changed.
        - \applyMusic #(remove-tag '. . .) => \keepWithTag #'. . .
     first-page-number isn't changed.
        - first-page-number no => print-first-page-number = ##f
     Line breaks in header strings aren't converted.
        - \\\\  as line break in \header strings => \markup \center-align <
          "First Line" "Second Line" >
     Crescendo and decrescendo terminators aren't converted.
        - \rced => \!
        - \rc => \!
    2.2->2.4:
     \turnOff (used in \set Staff.VoltaBracket = \turnOff) is not properly
    converted.
    2.4.2->2.5.9
     \markup{ \center-align <{ ... }> } should be converted to:
     \markup{ \center-align {\line { ... }} }
     but now, \line is missing.
    2.4->2.6
     Special LaTeX characters such as $~$ in text are not converted to UTF8.
    2.8
     \score{} must now begin with a music expression.  Anything else
     (particularly \header{}) must come after the music.

### 脚注

[1] At least, this is possible in any LilyPond file which does not contain scheme. If there is scheme in the file, then the LilyPond file contains a Turing-complete language, and we run into problems with the famous “Halting Problem” in computer science.

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#### LilyPond — 使用方法