# Using GIT and VI together


A long while back I used `vi` together with `rcs` to manage files
in `/etc`. This worked, but I found `rcs` to be clunky. So welcome
to the 21st century and my `git` + `vi` script.

It is a wrapper around `git`, which will create a new
git repository, add the file and commit it when changed.

The script will also expand `$Hash$` to  

    $Hash: basename-of-file short-commit-hash epoch committer`

a typical example is

    $Hash: motd.tail 2ebb8e9 1230404370 miekg $

This is somewhat the same as the `$Id$` tag from `svn/CVS`, but with a
different tag. I always found this tagging from subversion useful, esp.
when you -- as a human -- needs to tell if a file is under version
control.

To avoid accidental edits the file is set to read-only.

I think I'm gonna dump `cfengine` and just use this script, `cfengine` is
great, but somewhat of a overkill for my home setup.

# Sourcecode of the script

The script uses `zsh`, but can be easily converted to `bash` or any
other shell.

    #!/bin/zsh
    # a wrapper around git and vi
    # expands $Hash$ to $Hash: file short_hash epoch committer $
    # git checkout HEAD $file? when would I need this

    [[ ! -x =git ]] && exit 1

    who=$SUDO_USER
    who=${who:-$LOGNAME}

    for file in "$@"; do

	dir=$(dirname $file); cd $dir

	chmod +w $file 2> /dev/null

	if [[ ! -d .git ]]; then
	    git init || exit 1
	fi

	if vi $file; then
	    [[ ! -e $file ]] && exit 0
	    git add $file
	    # collapse $Hash: id $ line
	    sed -i -e 's/\$Hash:.*\$/$Hash$/' $file
	    git commit $file
	fi

	id=$(git-show -s --pretty=format:$(basename $file)\ %h\ %ct\ $who%n -- $file) 
	[[ -z $id ]] && exit 1

	# re-add $Hash: sha1hash$ line
	sed -i -e 's/\$Hash\$'/\$Hash:\ $id\ \$/ $file

	chmod a-w $file 2> /dev/null
    done

# update
I just thought of something, what if there already *is* a git repository
in a higher directory....Hmmm. This means the script should look for a
`git` repository higher up and work from there....