forgejo/modules/git/repo_language_stats_nogogit.go
zeripath 523efa433b
Move Bleve and Elastic code indexers to use a common cat-file --batch (#14781)
* Extract out the common cat-file batch calls

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Move bleve and elastic indexers to use a common cat-file --batch when indexing

Signed-off-by: Andrew Thornton <art27@cantab.net>

* move catfilebatch to batch_reader and rename to batch_reader.go

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
2021-03-03 21:57:01 -05:00

157 lines
3.8 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.
// +build !gogit
package git
import (
"bufio"
"bytes"
"io"
"math"
"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) {
// We will feed the commit IDs in order into cat-file --batch, followed by blobs as necessary.
// so let's create a batch stdin and stdout
batchStdinWriter, batchReader, cancel := CatFileBatch(repo.Path)
defer cancel()
writeID := func(id string) error {
_, err := batchStdinWriter.Write([]byte(id))
if err != nil {
return err
}
_, err = batchStdinWriter.Write([]byte{'\n'})
return err
}
if err := writeID(commitID); err != nil {
return nil, err
}
shaBytes, typ, size, err := ReadBatchLine(batchReader)
if typ != "commit" {
log("Unable to get commit for: %s. Err: %v", commitID, err)
return nil, ErrNotExist{commitID, ""}
}
sha, err := NewIDFromString(string(shaBytes))
if err != nil {
log("Unable to get commit for: %s. Err: %v", commitID, err)
return nil, ErrNotExist{commitID, ""}
}
commit, err := CommitFromReader(repo, sha, io.LimitReader(batchReader, size))
if err != nil {
log("Unable to get commit for: %s. Err: %v", commitID, err)
return nil, err
}
tree := commit.Tree
entries, err := tree.ListEntriesRecursive()
if err != nil {
return nil, err
}
contentBuf := bytes.Buffer{}
var content []byte
sizes := make(map[string]int64)
for _, f := range entries {
contentBuf.Reset()
content = contentBuf.Bytes()
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
if f.Size() <= bigFileSize {
if err := writeID(f.ID.String()); err != nil {
return nil, err
}
_, _, size, err := ReadBatchLine(batchReader)
if err != nil {
log("Error reading blob: %s Err: %v", f.ID.String(), err)
return nil, err
}
sizeToRead := size
discard := int64(0)
if size > fileSizeLimit {
sizeToRead = fileSizeLimit
discard = size - fileSizeLimit
}
_, err = contentBuf.ReadFrom(io.LimitReader(batchReader, sizeToRead))
if err != nil {
return nil, err
}
content = contentBuf.Bytes()
err = discardFull(batchReader, discard)
if err != nil {
return nil, err
}
}
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 discardFull(rd *bufio.Reader, discard int64) error {
if discard > math.MaxInt32 {
n, err := rd.Discard(math.MaxInt32)
discard -= int64(n)
if err != nil {
return err
}
}
for discard > 0 {
n, err := rd.Discard(int(discard))
discard -= int64(n)
if err != nil {
return err
}
}
return nil
}