package main

import (
	"fmt"
	"path/filepath"
	"io/ioutil"

	git "github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing/object"
)

func main() {
	dir, _ := ioutil.TempDir("", "repo")

	repo, _ := git.PlainInit(dir, false)
	w, err := repo.Worktree()
	if err != nil {
		panic(err)
	}
	// If uncommented, the log result for file a.txt will be non-empty.
	/*
	ioutil.WriteFile(filepath.Join(dir, "b.txt"), []byte("abcd"), 0644)
	w.Add("b.txt")
	w.Commit("pre-initial commit", &git.CommitOptions{})
	*/
	ioutil.WriteFile(filepath.Join(dir, "a.txt"), []byte("abcd"), 0644)
	w.Add("a.txt")
	w.Commit("initial commit", &git.CommitOptions{})

	pth := "a.txt"
	commits, err := repo.Log(&git.LogOptions{FileName: &pth, All: true})
	if err != nil {
		panic(err)
	}
	err = commits.ForEach(func(c *object.Commit) error {
		fmt.Println(c.Hash.String()) // This will not be called.
		return nil
	})
	if err != nil {
		panic(err)
	}
}