extracting "tag" information from git with a shell script

Question

The vc bundle is a neat little package that extracts information about a git repo for easy insertion into a LaTeX document. It doesn't currently extract information about whether the current commit is tagged and what the tag name is. How would I edit the vc script to do this?

And then how would I edit the vc-git.awk script to add an extra line to the generated vc.tex file? Presumably I want a line that looks like:

print "\\gdef\\GITTag{" Tag "}%"

but I need an earlier line that tells awk what " Tag " means?

This isn't a question about LaTeX, it is about git, awk and bash...

Answer 1

git log --decorate -1 [commit]

If commit (HEAD if omitted) has tags, the commit hash will be followed by (tag: name) (and possibly multiple other symbolic references too). You can pick this out more specifically with

git log --pretty=%d

Answer 2

You can get what commit tag points to by:

git show -s 'TAG_NAME^{commit}' --format='%H'

Unfortunatly I'm afraid that the only way of checking if commit is tagged it to check all tags.

Answer 3

You can get from a commit to a tag name by using name-rev.

git name-rev <commit> --tags

An example:

$ git name-rev fcfeabe --tags
fcfeabe tags/v2.36-beta2

So to get only the tag:

git name-rev fcfeabe --tags | awk '{sub("tags/", ""); print $2}'