pull

#!/bin/rc -e
rfork en
. /sys/lib/git/common.rc

usage='
	git/pull [-u upstream] [-b branch]
		-b       work with branch "branch"
		-f       fetch updates without checking out
		-i       display incoming commits
		-u       pull from "upstream" (default "origin")
'

fn update{
	branch=$1
	upstream=$2
	url=$3
	dir=$4
	bflag=()
	if(! ~ $branch '')
		bflag=(-b $branch)
	{git/fetch $bflag -u $upstream $url >[2=3] || die $status} | awk '
	/^remote/{
		if($2=="HEAD")
			next
		ref=$2
		hash=$3
		gsub("^refs/heads", "refs/remotes/'$upstream'", ref)
		outfile = ".git/"ref
		system("mkdir -p `{basename -d "outfile"}");
		print hash > outfile;
		close(outfile);
	}
	' |[3] tr '\x0d' '\x0a'
}

gitup

branch=refs/`{git/branch}
remote=()
incoming=true
checkout='true'
upstream=origin

while(~ $1 -*){
	switch($1){
	case -u
		upstream=$2
		remote=`{git/conf 'remote "'$upstream'".url'}
		if(~ $#remote 0){
			upstream=SOMEONE
			remote=$2
		}
		shift
	case -b
		branch=$2
		shift
	case -a
		branch=''
	case -f
		checkout=()
	case -q
		incoming=()
	case *
		usage
	}
	shift
}
if(! ~ $#* 0)
	usage

if(~ $#remote 0)
	remote=`{git/conf 'remote "'$upstream'".url'}
if(~ $#remote 0)
	die 'no remote to pull from'

update $branch $upstream $remote
if (~ $#checkout 0)
	exit

local=`{git/branch}
remote=`{git/branch | subst '^(refs/)?heads' 'remotes/'$upstream}

# we have local commits, but the remote hasn't changed.
# in this case, we want to keep the local commits untouched.
if(~ `{git/query HEAD $remote @} `{git/query $remote}){
	echo 'up to date' >[1=2]
	exit
}
# The remote repository and our HEAD have diverged: we
# need to merge.
if(! ~ `{git/query HEAD $remote @} `{git/query HEAD}){
	>[1=2]{
		echo ours:	`{git/query HEAD}
		echo theirs:	`{git/query $remote}
		echo common:	`{git/query HEAD $remote @}
		echo git/merge $remote
	}
	exit diverged
}
# The remote is directly ahead of the local, and we have
# no local commits that need merging.
if(! ~ $#incoming 0)
	git/log -s -e $local'..'$remote >[1=2]
echo
echo $remote':' `{git/query $local} '=>' `{git/query $remote}  >[1=2]
git/branch -n -b $remote $local
exit ''