#!/bin/sh
#

USAGE='<tag|commit|blob> | [<ent>|-1|-2|-3] -- <file>'
SUBDIRECTORY_OK='Yes'
. git-sh-setup

rev=$(git-rev-parse --revs-only --no-flags --sq "$@") || exit
flags=$(git-rev-parse --no-revs --flags "$@")
files=$(git-rev-parse --no-revs --no-flags --sq "$@")

case "$rev,$files" in
?*' '?*,*|*,?*' '?*)
	usage
	;;
?*,?*)
	sha1=$(eval "git-ls-tree $rev $files" | cut -f 1 | cut -d " " -f 3)
	;;
?*,)
	sha1=$rev
	;;
,?*)
	# Only one file
	[ $(eval "git-ls-files $files | wc -l") != 1 ] && usage
	stg=0
	flag=${flags#-}
	case $flag in
	    1|2|3) stg=$flag;;
	esac
	sha1=$(eval "git-ls-files -s $files" | while read -r mode sha stage name ; do
		[ $stage -eq $stg ] && echo $sha && break ; done)
	;;
*)
	usage
	;;
esac

[ -z $sha1 ] && echo "$(basename $0): $files: Not found" && exit 1
type=$(eval "git-cat-file -t $sha1")

case $type in
    tree)
	usage
	;;
    tag|blob)
	cmd="git-cat-file $type $sha1"
	;;
    commit)
	cmd="git-rev-list --max-count=1 $sha1 --pretty=fuller"
	;;
esac

eval "$cmd"
exit