shithub: git9

ref: ec28e68d5f5d72748d4b2d0be2861956b856ef4f
dir: git9/branch

#!/bin/rc -e

rfork en

fn usage{
	echo usage: $argv0 [-b base] [-o origin] new >[2=1]
	echo '	'-b base:	use "base" for branch (default: current branch) >[2=1]
	echo '	'-o origin:	use "origin" for remote branch >[2=1]
	echo '	'new:		name of new branch
	exit usage
}

if(! cd `{git/conf -r}){
	exit 'not in git repository'
	exit notgit
}
git/fs

nl='
'
stay=''
create=''
cur=`{awk '$1=="branch"{print $2}' < /mnt/git/ctl}
while(~ $1 -* && ! ~ $1 --){
	switch($1){
	case -c; create=true
	case -s; stay=true
	case -o; origin=$1
	case *; usage
	}
	shift
}
if(~ $1 --) shift

if(~ $#* 0){
	echo $cur
	exit
}
if(! ~ $#* 1)
	usage
new=$1

if(~ $create ''){
	if(! test -e .git/refs/heads/$new){
		echo branch $new: does not exist >[1=2]
		exit exists
	}
}
if not{
	if(test -e .git/refs/heads/$new){
		echo could not create $new: already exists >[1=2]
		exit exists
	}
	branched=''
	candidates=(.git/refs/$cur .git/refs/heads/$cur .git/refs/remotes/$cur .git/refs/remotes/*/$cur)
	for(br in $candidates){
		if(test -f $br){
			echo 'creating new branch '$new
			cp $br .git/refs/heads/$new
			branched="ok"
		}
	}
	if(~ $branched ''){
		echo 'could not find branch '$cur >[1=2]
		exit notfound
	}
}

if(~ $stay ''){
	rm -f `$nl{git/walk -cfT}
	echo 'ref: refs/heads/'$new > .git/HEAD
	tree=/mnt/git/HEAD/tree
	@{builtin cd $tree && tar cif /fd/1 .} | @{tar xf /fd/0}
	for(f in `$nl{walk -f $tree | sed 's@^'$tree'/*@@'}){
		if(! ~ $#f 0){
			idx=.git/index9/tracked/$f
			mkdir -p `{basename -d $idx}
			walk -eq $f > $idx
		}
	}
}