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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...

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3 Answers 3

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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
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This i great, I've added Tag: %d to the vc script linked to above, and copied a line in the awk script that extracts the information to a TeX macro. This gives me a macro that does: (HEAD, tag: v1.01, master) I just need to cut this down to the v1.01 part only... –  Seamus Jan 11 '11 at 16:30
    
/^GITTag:/ {print $4}' prints v1.01, Now I just need to delete that comma! –  Seamus Jan 11 '11 at 20:14
    
print substr($4,1,length($4)-1) works –  Seamus Jan 11 '11 at 22:22

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.

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That's the opposite of what I want: I want to know how to know what tag is attached to a given commit... –  Seamus Dec 21 '10 at 15:31
    
I don't think the reverse is possible in other way then going through all tags and checking what commits they point to. –  Maciej Piechotka Dec 21 '10 at 15:52

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}' 
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