#!/bin/sh
##
## find-sim finds the similarity of one file with the files in the
##           selected commits
##
## The arguments are:
##      $1     - file to compare
##      $n n>2 - arguments for git-rev-list to select the commits
##
. git-sh-setup || die "Not a git archive."

[ ! -e $1 ] && exit 1
file=$1
shift

case $GIT_DIR in
    /*)
	GIT_DIR_ORIG=$GIT_DIR;;
    *)
	GIT_DIR_ORIG=$PWD/$GIT_DIR
esac

tmp=`mktemp -t -d git-find-sim.XXXXXXX`
GIT_DIR_TEMP=$tmp
mkdir -p $GIT_DIR_TEMP/objects/info
[ -e $GIT_DIR_ORIG/objects/info/alternates ] &&
cp $GIT_DIR_ORIG/objects/info/alternates $GIT_DIR_TEMP/objects/info/alternates
echo $GIT_DIR_ORIG/objects >> $GIT_DIR_TEMP/objects/info/alternates
export GIT_DIR=$GIT_DIR_TEMP

trap "rm -rf $tmp" 0 1 2 3 15

git update-index --add $file || exit 1
tree=`git-write-tree`

rev_arg=`GIT_DIR=$GIT_DIR_ORIG git-rev-parse --default HEAD --revs-only "$@"`
revs=`GIT_DIR=$GIT_DIR_ORIG git-rev-list $rev_arg`
for i in $revs; do
    git diff-tree --name-status $i -C $tree | grep $file |
    sed "s/^/$i:/"
done