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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.
package git
import (
"bytes"
"io"
"io/ioutil"
"math"
"path/filepath"
"github.com/src-d/enry/v2"
"gopkg.in/src-d/go-git.v4"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/object"
)
const fileSizeLimit int64 = 16 * 1024 * 1024
// GetLanguageStats calculates language stats for git repository at specified commit
func (repo *Repository) GetLanguageStats(commitID string) (map[string]float32, 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)
var total int64
err = tree.Files().ForEach(func(f *object.File) error {
if enry.IsVendor(f.Name) || enry.IsDotFile(f.Name) ||
enry.IsDocumentation(f.Name) || enry.IsConfiguration(f.Name) {
return nil
}
// TODO: Use .gitattributes file for linguist overrides
language, ok := enry.GetLanguageByExtension(f.Name)
if !ok {
if language, ok = enry.GetLanguageByFilename(f.Name); !ok {
content, err := readFile(f, fileSizeLimit)
if err != nil {
return nil
}
language = enry.GetLanguage(filepath.Base(f.Name), content)
if language == enry.OtherLanguage {
return nil
}
}
}
if language != "" {
sizes[language] += f.Size
total += f.Size
}
return nil
})
if err != nil {
return nil, err
}
stats := make(map[string]float32)
var otherPerc float32 = 100
for language, size := range sizes {
perc := float32(math.Round(float64(size)/float64(total)*1000) / 10)
if perc <= 0.1 {
continue
}
otherPerc -= perc
stats[language] = perc
}
otherPerc = float32(math.Round(float64(otherPerc)*10) / 10)
if otherPerc > 0 {
stats["other"] = otherPerc
}
return stats, 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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