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package main
import (
"fmt"
"io/fs"
"os"
"os/exec"
"path"
"strconv"
"strings"
"time"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/martinlehoux/kagamigo/kcore"
)
type RecordExtractorFactory interface {
CreateExtractor(relativePath string) (RecordExtractor, error)
}
type RecordExtractor interface {
Extract(keyword string, line int) (Record, error)
}
var ErrNotTracked = fmt.Errorf("file is not tracked by git")
func CreateRecordExtractorFactory(algo, repoPath string) (RecordExtractorFactory, error) {
switch algo {
case "git":
return NewGitRecordExtractorFactory(repoPath)
case "go-git":
return NewGoGitRecordExtractorFactory(repoPath)
case "stat":
return &StatRecordExtractorFactory{repoPath: repoPath}, nil
default:
return nil, fmt.Errorf("unsupported algorithm: %s", algo)
}
}
type GitRecordExtractorFactory struct {
repoPath string
trackedFiles map[string]bool
}
func NewGitRecordExtractorFactory(repoPath string) (*GitRecordExtractorFactory, error) {
cmd := exec.Command("git", "ls-files")
cmd.Dir = repoPath
output, err := cmd.Output()
if err != nil {
return nil, fmt.Errorf("git ls-files failed: %w", err)
}
tracked := map[string]bool{}
for _, line := range strings.Split(strings.TrimSpace(string(output)), "\n") {
if line != "" {
tracked[line] = true
}
}
return &GitRecordExtractorFactory{repoPath: repoPath, trackedFiles: tracked}, nil
}
func (f *GitRecordExtractorFactory) CreateExtractor(relativePath string) (RecordExtractor, error) {
if !f.trackedFiles[relativePath] {
return nil, ErrNotTracked
}
cmd := exec.Command("git", "blame", "--porcelain", relativePath) // #nosec G204
cmd.Dir = f.repoPath
output, err := cmd.Output()
if err != nil {
return nil, fmt.Errorf("git blame failed: %w", err)
}
lineDates, err := parseBlameOutput(output)
if err != nil {
return nil, err
}
return &GitRecordExtractor{lineDates: lineDates}, nil
}
func parseBlameOutput(output []byte) (map[int]time.Time, error) {
// Porcelain format emits commit metadata only on first occurrence of a SHA.
// Track timestamp per SHA, then map final line number → timestamp.
commitTimes := map[string]time.Time{}
lineCommit := map[int]string{}
var currentSHA string
var currentLine int
for _, blameLine := range strings.Split(string(output), "\n") {
// Commit header: "<40-char-sha> <orig> <final> [<count>]"
if len(blameLine) > 40 && blameLine[40] == ' ' {
parts := strings.Fields(blameLine)
if len(parts) >= 3 {
currentSHA = parts[0]
n, err := strconv.Atoi(parts[2])
if err == nil {
currentLine = n
lineCommit[currentLine] = currentSHA
}
}
} else if after, ok := strings.CutPrefix(blameLine, "author-time "); ok {
timestamp, err := strconv.ParseInt(after, 10, 64)
if err != nil {
return nil, fmt.Errorf("error parsing timestamp: %w", err)
}
commitTimes[currentSHA] = time.Unix(timestamp, 0)
}
}
lineDates := map[int]time.Time{}
for line, sha := range lineCommit {
lineDates[line] = commitTimes[sha]
}
return lineDates, nil
}
type GoGitRecordExtractorFactory struct {
head *object.Commit
}
func NewGoGitRecordExtractorFactory(repoPath string) (*GoGitRecordExtractorFactory, error) {
repo, err := git.PlainOpen(path.Join(repoPath, ".git"))
kcore.Expect(err, "Error opening repository")
ref, err := repo.Head()
kcore.Expect(err, "Error getting HEAD")
head, err := repo.CommitObject(ref.Hash())
kcore.Expect(err, "Error getting commit object")
return &GoGitRecordExtractorFactory{head: head}, nil
}
func (f *GoGitRecordExtractorFactory) CreateExtractor(relativePath string) (RecordExtractor, error) {
blame, err := git.Blame(f.head, relativePath)
if err == object.ErrFileNotFound {
return nil, err
}
return &GoGitRecordExtractor{blame: blame}, nil
}
type StatRecordExtractorFactory struct {
repoPath string
}
func (f *StatRecordExtractorFactory) CreateExtractor(relativePath string) (RecordExtractor, error) {
fileInfo, err := os.Stat(path.Join(f.repoPath, relativePath))
kcore.Expect(err, "Error getting file info")
return &StatRecordExtractor{
fileInfo: fileInfo,
}, nil
}
type StatRecordExtractor struct {
fileInfo fs.FileInfo
}
func (re *StatRecordExtractor) Extract(keyword string, line int) (Record, error) {
return Record{
keyword: keyword,
line: line,
date: re.fileInfo.ModTime(),
}, nil
}
type GoGitRecordExtractor struct {
blame *git.BlameResult
}
func NewGoGitRecordExtractor(head *object.Commit, relativePath string) *GoGitRecordExtractor {
blame, err := git.Blame(head, relativePath)
if err == object.ErrFileNotFound {
return nil
}
return &GoGitRecordExtractor{
blame: blame,
}
}
func (re *GoGitRecordExtractor) Extract(keyword string, line int) (Record, error) {
record := Record{
keyword: keyword,
line: line,
date: re.blame.Lines[line-1].Date,
}
return record, nil
}
type GitRecordExtractor struct {
lineDates map[int]time.Time
}
func (re *GitRecordExtractor) Extract(keyword string, line int) (Record, error) {
date, ok := re.lineDates[line]
if !ok {
return Record{}, fmt.Errorf("no blame data for line %d", line)
}
return Record{keyword: keyword, line: line, date: date}, nil
}
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