GOPATH 内の git リポジトリで全部 git gc するやつ

main.go

package main

import (
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

func main() {
	b, err := exec.Command("ghq", "list").CombinedOutput()
	if err != nil {
		log.Fatal(err)
	}
	for _, line := range strings.Split(string(b), "\n") {
		for _, p := range filepath.SplitList(os.Getenv("GOPATH")) {
			repo := filepath.FromSlash(filepath.Join(p, "src", line))
			if _, err = os.Stat(filepath.Join(repo, ".git")); err != nil {
				continue
			}
			log.Print(repo)
			cmd := exec.Command("git", "gc")
			cmd.Stdout = os.Stdout
			cmd.Stderr = os.Stderr
			cmd.Dir = repo
			if err = cmd.Run(); err != nil {
				log.Print(err)
			}
		}
	}
}