# This is a shell library to calculate the remote repository and
# upstream branch that should be pulled by "git pull" from the current
# branch.

# git-ls-remote could be called from outside a git managed repository;
# this would fail in that case and would issue an error message.
setvar GIT_DIR = $(git rev-parse -q --git-dir) || :;

proc get_default_remote {
	setvar curr_branch = $(git symbolic-ref -q HEAD)
	setvar curr_branch = "${curr_branch#refs/heads/}"
	setvar origin = $(git config --get "branch.$curr_branch.remote")
	echo ${origin:-origin}
}

proc get_remote_merge_branch {
	case (#) {
	0|1 {
	    setvar origin = "$1"
	    setvar default = $(get_default_remote)
	    test -z $origin && setvar origin = "$default"
	    setvar curr_branch = $(git symbolic-ref -q HEAD) &&
	    test $origin = $default &&
	    echo $(git for-each-ref --format='%(upstream)' $curr_branch)
	    }
	* {
	    setvar repo = "$1"
	    shift
	    setvar ref = "$1"
	    # FIXME: It should return the tracking branch
	    #        Currently only works with the default mapping
	    case (ref) {
	    +* {
		setvar ref = $(expr "z$ref" : 'z+\(.*\)')
		}
	    }
	    expr "z$ref" : 'z.*:' >/dev/null || setvar ref = ""${ref}:""
	    setvar remote = $(expr "z$ref" : 'z\([^:]*\):')
	    case (remote) {
	    '' | HEAD  { setvar remote = 'HEAD' }
	    heads/* { setvar remote = ${remote#heads/} }
	    refs/heads/* { setvar remote = ${remote#refs/heads/} }
	    refs/* | tags/* | remotes/*  { setvar remote = ''
	    }
}
	    test -n $remote && case (repo) {
		. {
		    echo "refs/heads/$remote"
		    }
		* {
		    echo "refs/remotes/$repo/$remote"
		    }
	    }
	}
}
}

proc error_on_missing_default_upstream {
	setvar cmd = "$1"
	setvar op_type = "$2"
	setvar op_prep = "$3" # FIXME: op_prep is no longer used
	setvar example = "$4"
	setvar branch_name = $(git symbolic-ref -q HEAD)
	setvar display_branch_name = "${branch_name#refs/heads/}"
	# If there's only one remote, use that in the suggestion
	setvar remote = "$(gettext "<remote>")"
	setvar branch = "$(gettext "<branch>")"
	if test $(git remote | wc -l) = 1
	{
		setvar remote = $(git remote)
	}

	if test -z $branch_name
	{
		gettextln "You are not currently on a branch."
	} else {
		gettextln "There is no tracking information for the current branch."
	}
	case (op_type) {
	rebase {
		gettextln "Please specify which branch you want to rebase against."
		}
	merge {
		gettextln "Please specify which branch you want to merge with."
		}
	* {
		echo >&2 "BUG: unknown operation type: $op_type>&2 "BUG: unknown operation type: $op_type"
		exit 1
		}
	}
	eval_gettextln "See git-\${cmd}(1) for details."
	echo
	echo "    $example"
	echo
	if test -n $branch_name
	{
		gettextln "If you wish to set tracking information for this branch you can do so with:"
		echo
		echo "    git branch --set-upstream-to=$remote/$branch $display_branch_name"
		echo
	}
	exit 1
}