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go-git-log.go

package main

import (
	"fmt"
	"path/filepath"
	"strings"

	"gopkg.in/src-d/go-billy.v4/osfs"
	"gopkg.in/src-d/go-git.v4"
	"gopkg.in/src-d/go-git.v4/plumbing/cache"
	"gopkg.in/src-d/go-git.v4/plumbing/object"
	"gopkg.in/src-d/go-git.v4/storage/filesystem"
)

func main() {
	targetCount := 20
	workingDirectory := "."
	gitDotFS := osfs.New(filepath.Join(workingDirectory, ".git"))
	gitWorkingDirFS := osfs.New(workingDirectory)
	objectCache := cache.NewObjectLRUDefault()
	gitStorage := filesystem.NewStorage(gitDotFS, objectCache)
	gitRepo, err := git.Open(gitStorage, gitWorkingDirFS)
	if err != nil {
		panic(err)
	}
	commitIter, err := gitRepo.Log(&git.LogOptions{
		Order: git.LogOrderBSF,
	})
	if err != nil {
		panic(err)
	}
	var commits []object.Commit
	for i := 0; i < targetCount; {
		commit, err := commitIter.Next()
		if err != nil {
			panic(err)
		}
		if commit == nil {
			break
		}
		if len(commit.ParentHashes) > 1 {
			continue
		}
		commits = append(commits, *commit)
		i++
	}
	for i := 0; i < targetCount; i++ {
		commit := commits[i]
		msg := strings.SplitN(commit.Message, "\n", 2)[0]
		fmt.Printf("- %v\n", msg)
	}
}