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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"
)
// GetLanguageStats calculates language stats for git repository at specified commit
func (repo *Repository) GetLanguageStats(commitID string) (map[string]int64, error) {
// FIXME: We can be more efficient here...
//
// We're expecting that we will be reading a lot of blobs and the trees
// Thus we should use a shared `cat-file --batch` to get all of this data
// And keep the buffers around with resets as necessary.
//
// It's more complicated so...
commit, err := repo.GetCommit(commitID)
if err != nil {
log("Unable to get commit for: %s", commitID)
return nil, err
}
tree := commit.Tree
entries, err := tree.ListEntriesRecursive()
if err != nil {
return nil, err
}
sizes := make(map[string]int64)
for _, f := range entries {
if f.Size() == 0 || enry.IsVendor(f.Name()) || enry.IsDotFile(f.Name()) ||
enry.IsDocumentation(f.Name()) || enry.IsConfiguration(f.Name()) {
continue
}
// 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) {
continue
}
// TODO: Use .gitattributes file for linguist overrides
// FIXME: Why can't we split this and the IsGenerated tests to avoid reading the blob unless absolutely necessary?
// - eg. do the all the detection tests using filename first before reading content.
language := analyze.GetCodeLanguage(f.Name(), content)
if language == enry.OtherLanguage || language == "" {
continue
}
// group languages, such as Pug -> HTML; SCSS -> CSS
group := enry.GetLanguageGroup(language)
if group != "" {
language = group
}
sizes[language] += f.Size()
continue
}
// 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(entry *TreeEntry, limit int64) ([]byte, error) {
// FIXME: We can probably be a little more efficient here... see above
r, err := entry.Blob().DataAsync()
if err != nil {
return nil, err
}
defer r.Close()
if limit <= 0 {
return ioutil.ReadAll(r)
}
size := entry.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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