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// 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.
// +build gogit
package git
import (
"bytes"
"io"
"io/ioutil"
"code.gitea.io/gitea/modules/analyze"
"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
}
sizes := make(map[string]int64)
err = tree.Files().ForEach(func(f *object.File) error {
if f.Size == 0 || enry.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 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
}
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