package ssh

import (
	"errors"
	"regexp"
)

type GitCommand struct {
	Command string
	Args    string
}

var ErrInvalidCommand = errors.New("Not a Git command.")

// git-upload-pack 'user_loves_bananas/website'
var gitCommandRx = regexp.MustCompile(`^(git-upload-pack|git-receive-pack|git-upload-archive) '~([A-Za-z0-9_][A-Za-z0-9_.-]*/[A-Za-z0-9_][A-Za-z0-9_.-]*)'$`)

func parseGitCommand(raw string) (GitCommand, error) {
	matches := gitCommandRx.FindStringSubmatch(raw)
	if matches == nil {
		return GitCommand{}, ErrInvalidCommand
	}
	return GitCommand{
		Command: matches[1],
		Args:    matches[2], // guaranteed to be in "user/repo" form
	}, nil
}