Here is how I get the \gitCommitish in the tagline. First, include the "gitDefinitions.ily" file. I use something like this:
\include "/home/workspace/include/gitDefinitions.ily"
Then in the header declaration, add the \gitCommitish and any other items desired to the tagline entry:
\header {
title = "Title"
composer = ""
arranger = ""
meter = ""
tagline = \markup { \filename " " \source " " git Version: \gitCommitish Committed: \gitDateTime
Engraved:
\simple #(strftime "%d - %b - %Y - %H%M " (localtime (current-time)))
}
}
An example tagline from a score I am editing presently looks like this:
Here \source is just a note to remind me where I got the information i used. This could be person's name or whatever. For the tagline above, \source is "null", so that value is missing from the tagline. I hope that the above is helpful to others.
Regarding your comment about adding an _expression_ to \bookOutputSuffix -- that is what I am trying to do. That said,
\bookOutputSuffix "\gitCommitish" or \bookOutputSuffix = \gitCommitish does not work as expected.
What I seek is a way to append whatever the current git version is to the pdf filename that is generated so I don't have to open the pdf and check the tagline to see what version it is when searching for a specific version. Appending the git version to the filename would make it easier to know which version is represented by the pdf when searching through the directory.
The Guile information I have seen so far online has not been too helpful for this particular question. If anyone has any ideas, I would enjoy seeing those.
Cheers,
Ben