nl='
'

fn die{
	>[1=2] echo $0: $*
	exit $"*
}

fn usage{
	>[1=2] echo -n 'usage:' $usage
	exit 'usage'
}

fn subst {
	awk '
	BEGIN{ARGC=0}
	{sub(ARGV[1], ARGV[2]); print}
	' $*
}

fn drop {
	awk '
	BEGIN{ARGC=0}
	{
		if(index($0, ARGV[1]) == 1)
			$0=substr($0, length(ARGV[1])+1)
		print
	}
	' $*
}

fn mergeperm {
	if(~ $1 /dev/null && cmp $2 $3>/dev/null)
		status=gone
	if not if (~ $3 /dev/null && cmp $1 $2>/dev/null)
		status=gone
	if not {
		mergedperms='-x'
		if(test -x $2){
			if(test -x $1 -a -x $3)
				mergedperms='+x'
		}
		if not{
			if(test -x $1 -o -x $3)
				mergedperms='+x'
		}
		status=()
	}
}

fn whoami{
	ifs=$nl {name=`{git/conf user.name}}
	ifs=$nl {email=`{git/conf user.email}}
	if(test -f /adm/keys.who){
		if(~ $name '')
			ifs=$nl {name=`{awk -F'|' '$1=="'$user'" {x=$3} END{print x}' </adm/keys.who}}
		if(~ $email '')
			ifs=$nl {email=`{awk -F'|' '$1=="'$user'" {x=$5} END{print x}' </adm/keys.who}}
	}
	if(~ $name '')
		name=$user
	if(~ $email '')
		email=$user@$sysname
}

# merge1 out ours base theirs
fn merge1 {@{
	rfork e
	n=$pid
	out=$1
	ours=$2
	base=$3
	theirs=$4
	tmp=$out.tmp
	while(test -f $tmp){
		tmp=$tmp.$n
		n=`{echo $n + 1 | hoc}
	}

	if(! test -f $ours)
		ours=/dev/null
	if(! test -f $base)
		base=/dev/null
	if(! test -f $theirs)
		theirs=/dev/null
	if(! ape/diff3 -3 -m $ours $base $theirs > $tmp)
		echo merge needed: $out >[1=2]

	if(mergeperm $ours $base $theirs){
		mv $tmp $out
		git/add $out
		chmod $mergedperms $out
	}
	if not {
		rm -f $tmp $out
		git/rm $out
	}
}}

fn gitup{
	gitroot=`{git/conf -r >[2]/dev/null}
	if(~ $#gitroot 0)
		die 'not a git repository'
	gitfs=$gitroot/.git/fs
	gitrel=`{pwd | drop $gitroot | sed 's@^/@@'}
	if(~ $#gitrel 0)
		gitrel='.'
	if(! cd $gitroot)
		die cd $gitroot: no repo there
	startfs=()
	mkdir -p $gitfs
	if(! test -e $gitfs/ctl)
		startfs=true
	if(! grep -s '^repo '$gitroot'$' $gitfs/ctl >[2]/dev/null)
		startfs=true
	if(~ $#startfs 1)
		git/fs
	if not
		status=''
}