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package main
import (
"bufio"
"errors"
"flag"
"fmt"
"io"
"io/fs"
"os"
"os/exec"
"path/filepath"
"strings"
)
const codeDir = "/nezuko/code/"
func shellQuote(s string) string {
return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
}
func checkRepoName(name string) (string, error) {
if strings.Contains(name, "/") {
return "", fmt.Errorf("invalid name %q: contains slashes", name)
}
if !strings.HasSuffix(name, ".git") {
name += ".git"
}
return name, nil
}
func create() error {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `Usage: create REPO
Create a new git repo named REPO.
`)
}
d := flag.String("d", "", "description")
flag.Parse()
args := flag.Args()
if len(args) == 0 {
return fmt.Errorf("missing operand\nUse create -help for usage info")
}
if len(args) > 1 {
return fmt.Errorf("too many positional arguments\nUse create -help for usage info")
}
name, err := checkRepoName(args[0])
if err != nil {
return err
}
dir := filepath.Join(codeDir, name)
fmt.Fprintf(os.Stderr, "mkdir %s\n", shellQuote(dir))
if err := os.Mkdir(dir, 0755); err != nil {
return err
}
fmt.Fprintf(os.Stderr, "cd %s && git init --bare\n", shellQuote(dir))
git := exec.Command("git", "init", "--bare")
git.Dir = dir
git.Stdout = os.Stdout
git.Stderr = os.Stderr
if err := git.Run(); err != nil {
return err
}
if *d != "" {
if err := setRepoDescription(name, *d); err != nil {
return err
}
}
return nil
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return !errors.Is(err, fs.ErrNotExist)
}
func delete() error {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `Usage: delete REPO
Delete the git repo named REPO.
`)
}
flag.Parse()
args := flag.Args()
if len(args) == 0 {
return fmt.Errorf("missing operand\nUse delete -help for usage info")
}
if len(args) > 1 {
return fmt.Errorf("too many positional arguments\nUse delete -help for usage info")
}
name, err := checkRepoName(args[0])
if err != nil {
return err
}
dir := filepath.Join(codeDir, name)
shortName := strings.TrimSuffix(name, ".git")
fmt.Fprintf(os.Stderr, "This will irreversibly delete repo %q.\nType %q to confirm: ", name, shortName)
scanner := bufio.NewScanner(os.Stdin)
if !scanner.Scan() || scanner.Text() != shortName {
return fmt.Errorf("name does not match")
}
fmt.Fprintf(os.Stderr, "rm -rf %s\n", shellQuote(dir))
if !fileExists(dir) {
return fmt.Errorf("repo %q does not exist", name)
}
if err := os.RemoveAll(dir); err != nil {
return err
}
return nil
}
func setRepoDescription(repo, description string) error {
descriptionPath := filepath.Join(codeDir, repo, "description")
fmt.Fprintf(os.Stderr, "echo %s > %s\n", shellQuote(description), shellQuote(descriptionPath))
desc, err := os.OpenFile(descriptionPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
defer desc.Close()
if _, err := fmt.Fprintln(desc, description); err != nil {
return err
}
if err := desc.Close(); err != nil {
return err
}
return nil
}
func describe() error {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `Usage: describe -d DESCRIPTION REPO
Set the description for REPO.
`)
}
d := flag.String("d", "", "description")
flag.Parse()
args := flag.Args()
if len(args) == 0 {
return fmt.Errorf("missing operand\nUse describe -help for usage info")
}
if len(args) > 1 {
return fmt.Errorf("too many positional arguments\nUse describe -help for usage info")
}
if *d == "" {
return fmt.Errorf("missing required flag -d\nUse describe -help for usage info")
}
name, err := checkRepoName(args[0])
if err != nil {
return err
}
if err := setRepoDescription(name, *d); err != nil {
return err
}
return nil
}
func installFile(srcPath, dstPath string) error {
fmt.Fprintf(os.Stderr, "cp %s %s && chmod +x %[2]s\n", shellQuote(srcPath), shellQuote(dstPath))
src, err := os.Open(srcPath)
if err != nil {
return err
}
defer src.Close()
dst, err := os.OpenFile(dstPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
if err != nil {
return err
}
defer dst.Close()
if _, err := io.Copy(dst, src); err != nil {
return err
}
if err := dst.Close(); err != nil {
return err
}
return nil
}
func install() error {
const dir = "/nezuko/code/git-shell-commands"
fmt.Fprintf(os.Stderr, "Install to %q? ", dir)
scanner := bufio.NewScanner(os.Stdin)
if !scanner.Scan() {
return fmt.Errorf("exiting")
}
response := strings.TrimSpace(scanner.Text())
if !(response == "" || strings.EqualFold(response, "y") || strings.EqualFold(response, "yes")) {
return fmt.Errorf("exiting")
}
selfPath := os.Args[0]
if !strings.Contains(selfPath, "/") {
var err error
if selfPath, err = exec.LookPath(selfPath); err != nil {
return err
}
}
helpPath := filepath.Join(dir, "help")
if err := installFile(selfPath, helpPath); err != nil {
return err
}
for _, cmd := range []string{"create", "delete", "describe"} {
cmdPath := filepath.Join(dir, cmd)
fmt.Fprintf(os.Stderr, "ln -f %s %s\n", shellQuote(helpPath), shellQuote(cmdPath))
if err := os.Remove(cmdPath); err != nil && !errors.Is(err, os.ErrNotExist) {
return err
}
if err := os.Link(helpPath, cmdPath); err != nil {
return err
}
}
return nil
}
func help() {
fmt.Printf(`Available commands:
create create a new git repo
delete delete a git repo
describe set repo description
help print this message
`)
}
func main() {
var err error
switch filepath.Base(os.Args[0]) {
case "create":
err = create()
case "delete":
err = delete()
case "describe":
err = describe()
case "git-shell-commands":
err = install()
default:
help()
}
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
|
