sascha-andres/git-commit

package subcommands

import (
    "os"

    "flag"

    "github.com/pkg/errors"
)

// Install activates hook for project
func Install(gitFolderPath string) error {
    var forceOverwrite bool
    flagSet := flag.NewFlagSet("git-hook-commit install", flag.ContinueOnError)
    flagSet.BoolVar(&forceOverwrite, "f", false, `force file creation by overwriting`)
    err := flagSet.Parse(os.Args[2:])
    if err != nil {
        return errors.New("unable to parse arguments")
    }

    exeFile, err := os.Executable()
    if err != nil {
        return err
    }

    commitHookFilePath := createCommitHookFilePath(gitFolderPath)

    if checkFileExists(commitHookFilePath) {
        if !forceOverwrite {
            return errors.New("file already exists, use -f to force overwriting")
        }

        err = os.Remove(commitHookFilePath)
        if err != nil {
            return err
        }
    }

    return os.Symlink(exeFile, commitHookFilePath)
}

func checkFileExists(filePath string) bool {
    _, err := os.Stat(filePath)
    return err == nil
}