package main

import (
	"io/ioutil"
	"os"
	"os/exec"
)

var gitStashName string

func gitStashPush() {
	// create a temporary file that _ensures_ we have something to
	// "git stash push". Without this, if all changes were staged, then
	// "git stash push" would be a no-op, with exit code 0, and the
	// final "git stash pop" would erroneously pop whatever the user had
	// stashed themselves.
	f, err := ioutil.TempFile(".", "git-pre-commit-hook-stash.")
	if err != nil {
		Err("failed to create temporary file: %v", err)
	}
	gitStashName = f.Name()
	f.Close()

	// perform git stash
	cmd := exec.Command("git", "stash", "save",
		"--keep-index", // don't stash staged changes
		"--quiet",
		"--include-untracked", // ignores new unstaged files
	)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err = cmd.Run(); err != nil {
		Err("failed to run git stash: %v", err)
	}
}

func gitStashPop() {
	defer os.Remove(gitStashName)
	cmd := exec.Command("git", "stash", "pop", "--quiet")
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Run(); err != nil {
		Err("failed to run git stash pop: %v", err)
	}
}