Indexing (LilyPond Contributor’s Guide)

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Indexing

Use the following two commands.

@cindex … — for the general index
@funindex … — for commands and properties like \bar or left-margin

Here are some rules how index entries should look like.

Only capitalize the first word of a @cindex entry if you would do so in the middle of an English sentence. Examples:
```
@cindex ancient clef
@cindex Kievan clef
```
@funindex entries are written as-is; don’t omit the leading backslash if there is one.
Use singular forms as much as possible. After a comma, use whatever looks better. Examples:
```
@cindex clef
@cindex fingering instruction, for chords
```

Permute index entries if it makes sense. Example:

@cindex ancient note head
@cindex note head, ancient

Try to make entries fit into groups so that the printed index looks like this:

…
text, framing
text, horizontal alignment
text, in columns
text, in volta bracket
text, justified
…

Don’t insert @funindex{\foo} and @cindex{\foo} simultaneously.
If both foo and \foo need to be indexed with @funindex you have to use the @funindexpre or @funindexpost command: @funindexpre foo gets sorted before @funindex \foo, and @funindexpost \foo gets sorted after @funindex foo. Example:
```
@funindex [
@funindexpost \[
```
If you mention entities in a @cindex entry that would normally be entered with @funindex, use @code to mark them. Example:
```
@cindex @code{\context}, in @code{\layout} block
```
To get a literal ‘{’ or ‘}’ in an index, write @{ and @}, respectively.
As of November 2022, if an index entry starts with an accented character, use a Texinfo accent macro instead of the real character. For example, an index entry for ‘Äolisch’ should be entered as
```
@cindex @"Aolisch
```
to circumvent a problem with texindex (used by Texinfo to sort and unify index entries in PDF output): This program currently has no support for locale-specific collation. In the above example, the entry is now sorted as ‘Aolisch’.

In case this is not sufficient it is always possible to explicitly specify a sorting key using the @sortas command: Assuming that entries starting with letter ‘ä’ must be sorted after all entries starting with letter ‘a’, writing
```
@cindex @sortas{azzzAolisch} Äolisch
```
would make this work. Unfortunately, this trick doesn’t create an initial letter in the printed index for entries starting with ‘Ä’.

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Indexing

LilyPond Contributor’s Guide v2.25.15 (development-branch).