git-lava-common

#!/bin/bash

# shell output
warn() { echo "$@" >&2; }
die() { warn "$@"; exit 1; }

escape() {
	echo "$1" | sed 's/\([\.\$\*]\)/\\\1/g'
}

# set logic
has() {
	local item=$1; shift
	echo " $@ " | grep -q " $(escape $item) "
}

# git functionality

git_local_branches() { git branch --no-color | sed 's/^[* ] //'; }
git_remote_branches() { git branch -r --no-color | sed 's/^[* ] //'; }

git_local_branch_exists() {
	has $1 $(git_local_branches)
}

git_remote_branch_exists() {
	has $1 $(git_remote_branches)
}

git_branch_exists() {
	has $1 $(git_all_branches)
}

current_branch() {
	git for-each-ref --format='%(refname:short)' `git symbolic-ref HEAD`
}

local_merge_target() {
	if [ -z $2 ]; then
		# get
		git config branch.$1.localmerge
	else
		# set
		git config branch.$1.localmerge $2
	fi
}

branch_origin() {
	git config branch.$1.remote
}

# Assertions

require_local_branch() {
	if ! git_local_branch_exists $1; then
		die "fatal: Local branch '$1' does not exist and is required."
	fi
}

require_remote_branch() {
	if ! has $1 $(git_remote_branches); then
		die "Remote branch '$1' does not exist and is required."
	fi
}

require_branch() {
	if ! has $1 $(git_all_branches); then
		die "Branch '$1' does not exist and is required."
	fi
}

require_branch_absent() {
	if has $1 $(git_all_branches); then
		die "Branch '$1' already exists. Pick another name."
	fi
}

#misc

run_hook() {
	local DOT_GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)

	if [ -x "$DOT_GIT_DIR/hooks/$1" ]; then
		. "$DOT_GIT_DIR/hooks/$1"
	fi
}