chore(install): 🧹 add installer

Signed-off-by: Eric Villard <[email protected]>

install.sh

@@ -0,0 +1,167 @@
+#! /usr/bin/env bash
+main_dir()
+{
+	dirname "$(readlink -f ${BASH_SOURCE})"
+}
+
+backup_dir()
+{
+	echo "$(main_dir)/.backup"
+}
+
+templates_dir()
+{
+	echo "$(main_dir)/templates"
+}
+
+usage()
+{
+	cat <<USAGE
+./install.sh [OPTIONS]
+
+Options:
+	-h			display this help
+	-t			globally configure git to use all templates
+	-u			uninstall
+
+By default, if the -t flag is not used, globally configure git to use ./templates/hooks
+USAGE
+}
+
+GIT_BACKUP_FILE="$(backup_dir)/gitconfig"
+INSTALL_TEMPLATES=1
+INSTALLED_FILE="$(main_dir)/.installed"
+
+declare -A GIT_CURRENT_CONFIGS=(
+	["core.hooksPath"]="$(git config --global --get core.hooksPath)"
+	["init.templateDir"]="$(git config --global --get init.templateDir)"
+)
+
+declare -A GIT_CONFIG_VALUES=(
+	["core.hooksPath"]="$(templates_dir)/hooks"
+	["init.templateDir"]="$(templates_dir)"
+)
+
+backup()
+{
+	mkdir -p "$(backup_dir)"
+
+	backup_git_config
+}
+
+backup_git_config()
+{
+	[ -e "${GIT_BACKUP_FILE}" ] || touch "${GIT_BACKUP_FILE}"
+
+	for key in "${!GIT_CURRENT_CONFIGS[@]}"; do
+		local value="${GIT_CURRENT_CONFIGS["${key}"]}"
+		if [ -n "${value}" ] && [[ "${value}" != "${GIT_CONFIG_VALUES["${key}"]}" ]]; then		
+			if grep "${key}" "${GIT_BACKUP_FILE}" &>/dev/null; then
+				sed -i -re "s/^${key/./\\.}[^\n]+/${key} ${value//\//\\\/}/" "${GIT_BACKUP_FILE}"
+			else
+				echo "${key} ${value}" >> "${GIT_BACKUP_FILE}"
+			fi
+		fi
+	done
+}
+
+link_hooks()
+{
+	for hook in "$(main_dir)"/src/git/hooks/*; do
+		ln -sf "${hook}" "$(templates_dir)"/hooks
+	done
+}
+
+check_git_config()
+{
+	[ "$(git config --global "$1")" == "$2" ]
+}
+
+set_git_config()
+{
+	git config --global "$1" "$2"
+}
+
+unset_git_config()
+{
+	git config --global --unset "$1"
+}
+
+restore()
+{
+	restore_git_config 	
+}
+
+restore_git_config()
+{
+	if [ -f "${GIT_BACKUP_FILE}" ]; then
+		cat "${GIT_BACKUP_FILE}" | while read -r conf; do
+			[ -n "${conf}" ] && set_git_config "${conf% *}" "${conf#* }"
+		done
+
+		echo > "${GIT_BACKUP_FILE}"
+	fi
+}
+
+is_installed()
+{
+	[ -f "${INSTALLED_FILE}" ]
+}
+
+install()
+{
+	is_installed && uninstall
+
+	backup
+	link_hooks
+	install_git
+	touch "${INSTALLED_FILE}"
+}
+
+install_git()
+{
+	if [[ "${INSTALL_TEMPLATES}" -eq 0 ]]; then
+		check_git_config "core.hooksPath" "${GIT_CONFIG_VALUES[core.hooksPath]}" && unset_git_config "core.hooksPath"
+	 	set_git_config "init.templateDir" "$(templates_dir)"
+	else
+		check_git_config "init.templateDir" "${GIT_CONFIG_VALUES[init.templateDir]}" && unset_git_config "init.templateDir"
+		set_git_config "core.hooksPath" "$(templates_dir)/hooks"
+	fi
+}
+
+uninstall()
+{
+	uninstall_git
+
+	restore
+	unlink "${INSTALLED_FILE}"
+}
+
+uninstall_git()
+{
+	for key in "${!GIT_CURRENT_CONFIGS[@]}"; do
+		unset_git_config "${key}"
+	done
+}
+
+while getopts ":htu" option
+do
+	case $option in
+		t)
+			INSTALL_TEMPLATES=0
+			;;
+		u)
+			is_installed && uninstall
+			exit $?
+			;;
+		h) 
+			usage
+			exit 0
+			;;
+		\?) usage
+			exit 1
+			;;
+	esac
+done
+
+install