vihead

#!/bin/sh
## In a git tree, list files from the last commit (HEAD), offer a selection and
## open in vim with the diff against HEAD^ (i.e. the last changes to the file).
#
# requires: fugitive-vim plugin

diff="$(git show)"
fn=

if [ $? = 0 ]; then
	select fn in $(git show HEAD | lsdiff --strip 1); do
		break;
	done
	# can be run anywhere in the directory tree, diff prints path relative
	# to the toplevel
	fn=$(realpath -e --relative-to=`pwd` ./`git rev-parse --show-cdup`/"$fn")
	echo "FN: $fn"
	if ! [ -f "$fn" ]; then
		echo "File not found"
		exit
	fi
else
	echo "not in git?"
fi

if [ -z "$fn" ]; then
	if [ -z "$1" ]; then
		echo "gimmea file"
		exit 1
	fi
	vi -c ":Gvdiffsplit HEAD^" "$@"
else
	vi -c ":Gvdiffsplit HEAD^" "$fn"
fi