Created
April 6, 2016 00:40
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package main | |
import ( | |
"bufio" | |
"fmt" | |
"log" | |
"os" | |
"os/exec" | |
"runtime/pprof" | |
"strings" | |
"time" | |
"gopkg.in/libgit2/git2go.v24" | |
) | |
func ago(t time.Time) string { | |
hours := time.Since(t).Hours() | |
var ago string | |
if hours > 24 { | |
ago = fmt.Sprintf("%d days ago", int(hours/24)) | |
} else { | |
ago = fmt.Sprintf("%d hours ago", int(hours)) | |
} | |
return ago | |
} | |
func short(s string) string { | |
scanner := bufio.NewScanner(strings.NewReader(s)) | |
scanner.Scan() | |
title := fmt.Sprintf("%.50s", scanner.Text()) | |
return title | |
} | |
func hasParent(child *git.Commit, father *git.Oid) bool { | |
for parent := uint(0); parent < child.ParentCount(); parent++ { | |
if *child.ParentId(parent) == *father { | |
return true | |
} | |
} | |
return false | |
} | |
func info1(r *git.Repository) map[string]*git.Commit { | |
walker, err := r.Walk() | |
if err != nil { | |
panic(err) | |
} | |
walker.Sorting(git.SortTime | git.SortTopological) | |
walker.PushHead() | |
head, err := r.Head() | |
if err != nil { | |
panic(err) | |
} | |
curId := head.Target() | |
commit, _ := r.LookupCommit(curId) | |
tree, _ := commit.Tree() | |
n := tree.EntryCount() | |
ids := make(map[string]git.Oid, n) | |
commits := make(map[string]*git.Commit, n) | |
times := make(map[string]time.Time, n) | |
for i := uint64(0); i < n; i++ { | |
entry := tree.EntryByIndex(i) | |
ids[entry.Name] = *entry.Id | |
commits[entry.Name] = commit | |
times[entry.Name] = commit.Author().When | |
} | |
for { | |
err := walker.Next(curId) | |
if err != nil { | |
break | |
} | |
commit, _ := r.LookupCommit(curId) | |
commitTime := commit.Author().When | |
tree, _ := commit.Tree() | |
for name, id := range ids { | |
entry := tree.EntryByName(name) | |
if entry != nil && *entry.Id == id { | |
commits[name] = commit | |
times[name] = commitTime | |
} else if commitTime.Before(times[name]) && | |
hasParent(commits[name], curId) { | |
delete(ids, name) | |
n-- | |
} | |
} | |
if commit.ParentCount() > 1 { | |
for j := uint(0); j < commit.ParentCount(); j++ { | |
parent := commit.Parent(j) | |
parentTime := parent.Author().When | |
tree, _ := parent.Tree() | |
for name, id := range ids { | |
entry := tree.EntryByName(name) | |
if entry != nil && *entry.Id == id { | |
if parentTime.Before(times[name]) { | |
commits[name] = parent | |
times[name] = parentTime | |
} | |
} | |
} | |
} | |
} | |
if n == 0 { | |
break | |
} | |
} | |
return commits | |
} | |
func info2(r *git.Repository) map[string]*git.Commit { | |
head, err := r.Head() | |
if err != nil { | |
panic(err) | |
} | |
commit, _ := r.LookupCommit(head.Target()) | |
tree, _ := commit.Tree() | |
n := tree.EntryCount() | |
commits := make(map[string]*git.Commit, n) | |
for i := uint64(0); i < n; i++ { | |
entry := tree.EntryByIndex(i) | |
out, _ := exec.Command("git", "log", "-1", "--pretty=format:%H", "--", entry.Name).Output() | |
id, _ := git.NewOid(string(out)) | |
commit, _ := r.LookupCommit(id) | |
commits[entry.Name] = commit | |
} | |
return commits | |
} | |
func main() { | |
f, err := os.Create("test.prof") | |
if err != nil { | |
log.Fatal(err) | |
} | |
pprof.StartCPUProfile(f) | |
defer pprof.StopCPUProfile() | |
r, err := git.OpenRepositoryExtended(os.Args[1], git.RepositoryOpenBare, "") | |
if err != nil { | |
panic(err) | |
} | |
os.Chdir(os.Args[1]) | |
t1 := time.Now() | |
commits := info2(r) | |
fmt.Println(time.Since(t1).Seconds()) | |
for key, commit := range commits { | |
fmt.Println(key, ago(commit.Author().When), short(commit.Message()), | |
commit.Id().String()) | |
} | |
t1 = time.Now() | |
commits = info1(r) | |
fmt.Println(time.Since(t1).Seconds()) | |
for key, commit := range commits { | |
fmt.Println(key, ago(commit.Author().When), short(commit.Message()), | |
commit.Id().String()) | |
} | |
} |
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