forgejo/modules/git/repo_language_stats_gogit.go
zeripath 248b96d8a3
Use git attributes to determine generated and vendored status for language stats and diffs (#16773)
Replaces #16262
Replaces #16250
Replaces #14833

This PR first implements a `git check-attr` pipe reader - using `git check-attr --stdin -z --cached` - taking account of the change in the output format in git 1.8.5 and creates a helper function to read a tree into a temporary index file for that pipe reader.

It then wires this in to the language stats helper and into the git diff generation.

Files which are marked generated will be folded by default.

Fixes #14786
Fixes #12653
2021-09-09 21:13:36 +01:00

181 lines
4.1 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
//go:build gogit
// +build gogit
package git
import (
"bytes"
"context"
"io"
"io/ioutil"
"code.gitea.io/gitea/modules/analyze"
"code.gitea.io/gitea/modules/log"
"github.com/go-enry/go-enry/v2"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
)
// GetLanguageStats calculates language stats for git repository at specified commit
func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, error) {
r, err := git.PlainOpen(repo.Path)
if err != nil {
return nil, err
}
rev, err := r.ResolveRevision(plumbing.Revision(commitID))
if err != nil {
return nil, err
}
commit, err := r.CommitObject(*rev)
if err != nil {
return nil, err
}
tree, err := commit.Tree()
if err != nil {
return nil, err
}
var checker *CheckAttributeReader
if CheckGitVersionAtLeast("1.7.8") == nil {
indexFilename, deleteTemporaryFile, err := repo.ReadTreeToTemporaryIndex(commitID)
if err == nil {
defer deleteTemporaryFile()
checker = &CheckAttributeReader{
Attributes: []string{"linguist-vendored", "linguist-generated", "linguist-language"},
Repo: repo,
IndexFile: indexFilename,
}
ctx, cancel := context.WithCancel(DefaultContext)
if err := checker.Init(ctx); err != nil {
log.Error("Unable to open checker for %s. Error: %v", commitID, err)
} else {
go func() {
err = checker.Run()
if err != nil {
log.Error("Unable to open checker for %s. Error: %v", commitID, err)
cancel()
}
}()
}
defer cancel()
}
}
sizes := make(map[string]int64)
err = tree.Files().ForEach(func(f *object.File) error {
if f.Size == 0 {
return nil
}
notVendored := false
notGenerated := false
if checker != nil {
attrs, err := checker.CheckPath(f.Name)
if err == nil {
if vendored, has := attrs["linguist-vendored"]; has {
if vendored == "set" || vendored == "true" {
return nil
}
notVendored = vendored == "false"
}
if generated, has := attrs["linguist-generated"]; has {
if generated == "set" || generated == "true" {
return nil
}
notGenerated = generated == "false"
}
if language, has := attrs["linguist-language"]; has && language != "unspecified" && language != "" {
// group languages, such as Pug -> HTML; SCSS -> CSS
group := enry.GetLanguageGroup(language)
if len(group) == 0 {
language = group
}
sizes[language] += f.Size
return nil
}
}
}
if (!notVendored && analyze.IsVendor(f.Name)) || enry.IsDotFile(f.Name) ||
enry.IsDocumentation(f.Name) || enry.IsConfiguration(f.Name) {
return nil
}
// If content can not be read or file is too big just do detection by filename
var content []byte
if f.Size <= bigFileSize {
content, _ = readFile(f, fileSizeLimit)
}
if !notGenerated && enry.IsGenerated(f.Name, content) {
return nil
}
// TODO: Use .gitattributes file for linguist overrides
language := analyze.GetCodeLanguage(f.Name, content)
if language == enry.OtherLanguage || language == "" {
return nil
}
// group languages, such as Pug -> HTML; SCSS -> CSS
group := enry.GetLanguageGroup(language)
if group != "" {
language = group
}
sizes[language] += f.Size
return nil
})
if err != nil {
return nil, err
}
// filter special languages unless they are the only language
if len(sizes) > 1 {
for language := range sizes {
langtype := enry.GetLanguageType(language)
if langtype != enry.Programming && langtype != enry.Markup {
delete(sizes, language)
}
}
}
return sizes, nil
}
func readFile(f *object.File, limit int64) ([]byte, error) {
r, err := f.Reader()
if err != nil {
return nil, err
}
defer r.Close()
if limit <= 0 {
return ioutil.ReadAll(r)
}
size := f.Size
if limit > 0 && size > limit {
size = limit
}
buf := bytes.NewBuffer(nil)
buf.Grow(int(size))
_, err = io.Copy(buf, io.LimitReader(r, limit))
return buf.Bytes(), err
}