git-alias

git-alias

#!/bin/bash

#    git alias [-p] [name[=value] ...]
# (bash) alias [-p] [name[=value] ...]

git_alias__show_help() {
	echo 'Usage: git alias [-p] [name[=value] ... ]'
}

# safe quote (like the alias command do)
# <str> => '<str>' with substitue each ' by '\'' inside <str>
#safequote() {
#	local v="'" ;# simple quote
#	local b='\' ;# simple backslash
#	echo "$v${1//$v/$v$b$v$v}$v"
#}
# found at bash also support : printf -v var %q "$1" ; echo "$var"
safequote() {
	printf %q "$1"
}

git_config() {
	if [ -n "$GIT_ALIAS_FILE" ]; then
		git config --file "$GIT_ALIAS_FILE" "$@"
	else
		git config --global "$@"
	fi
}

git_alias_showall() {
	git_config --get-regexp '^alias\.' \
	| sed -e 's,^alias\.\([^[:space:]]\+\)[[:space:]]\+\(.*\)$,git alias \1=\2,g' \
	| (IFS='='
		while read -r a b; do
			printf '%s=%s\n' "$a" "$(safequote "$b")"
		done
	)
}

git_alias_exists() {
	git_config --get "alias.$1" >/dev/null 2>&1
	local ret=$?
	# catch the special cases of multiple existing aliases with same name
	[ $ret -eq 2 ] && return 0 
	return $ret
}

git_alias_show() {
	local name="$1"
	if ! git_alias_exists "$name"; then
		echo "git alias: $name: not found"
		exit 1
	fi
	echo "git alias $name=$(safequote "$(git_config --get 'alias.'"$name")")"
}

git_alias_add() {
	local name="${1%%=*}"
	local value="${1#*=}"
	if [ -z "$value" ]; then
		echo "ERROR: empty value (for $name)"
		exit 1
	fi
	if git_alias_exists "$name"; then
		echo "Overwrite alias '$name'"
		#git_config --unset-all "alias.$name"
		git_config --replace-all "alias.$name" "$value"
	else
		git_config --add "alias.$name" "$value"
	fi
}

if [ $# -eq 0 ]; then
	git_alias_showall
else
while [ $# -gt 0 ];do
	case "$1" in
		-p)	git_alias_showall ; break ;;
		-*)	git_alias__show_help ; exit 1 ;;
		?*=?*)	git_alias_add "$1" ;;
		?*)	git_alias_show "$1" ;;
		*)
			git_alias__show_help ; exit 1
	esac
	shift
done
fi