#!/bin/bash
#
# Make a log of changes in a GIT branch.
#
# This script was originally written by (c) Ross Vandegrift.
# Adapted to his scripts set by (c) Petr Baudis, 2005.
# Major optimizations by (c) Phillip Lougher.
# Rendered trivial by Linus Torvalds.
# Added -L|-R option by James Bottomley
#
# Takes an id resolving to a commit to start from (HEAD by default).

tmpfile=/tmp/git_changes.$$

diffsearch=-
remote="$1"
shift;

if [ -z "$base" ]; then
	base=$(cat .git/HEAD) || exit 1
fi

git-rev-tree $base | sort -rn  > ${tmpfile}.base
if [ -n "$remote" ]; then
	[ -d $remote/.git ] || exit 1
	pushd $remote > /dev/null
	git-rev-tree $(cat .git/HEAD) | sort -rn > ${tmpfile}.remote
	diff -u ${tmpfile}.base ${tmpfile}.remote | grep "^${diffsearch}[^${diffsearch}]" | cut -c 1- > ${tmpfile}.diff
	rm -f ${tmpfile}.base ${tmpfile}.remote
	mv ${tmpfile}.diff ${tmpfile}.base
	if [ $diffsearch = "-" ]; then
		popd > /dev/null
	fi
fi

[ -s "${tmpfile}.base" ] || exit 0

### gregkh
#echo "${tmpfile}.base"
patch_num=999
cat ${tmpfile}.base | while read time commit parents; do
	git-rev-list --pretty ${commit%:*} ${parents%:*}

	file=/tmp/git-$patch_num.patch
	# write the original author out as first line of the file:
#	git-rev-list --pretty ${commit%:*} ${parents%:*} | grep "^Author" | cut -f 2 -d "<" | cut -f 1 -d ">" > $file
	git-cat-file commit ${commit%:*} | grep "^author" | cut -f 2 -d "<" | cut -f 1 -d ">" >> $file
	# write out the subject of the file:
#	git-rev-list --header ${commit%:*} ${parents%:*} | head -n 7 | tail -n 1 >> $file
	git-cat-file commit ${commit%:*} | head -n 6 | tail -n 1 >> $file
	# write out the whole patch
#	git-diff-tree -p -v ${commit%:*} ${parents%:*} >> $file
	cg-mkpatch -r ${commit%:*} >> $file
	let patch_num--
done
rm -f ${tmpfile}.base