From d174bb92ed033ac4235c5e7b30bf617575779fb9 Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Fri, 4 Oct 2024 10:25:53 +0200
Subject: refactor(kdev): Support several record extractors

---
 cmd/kdev/record_extractor.go | 95 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 cmd/kdev/record_extractor.go

(limited to 'cmd/kdev/record_extractor.go')

diff --git a/cmd/kdev/record_extractor.go b/cmd/kdev/record_extractor.go
new file mode 100644
index 0000000..2dc079e
--- /dev/null
+++ b/cmd/kdev/record_extractor.go
@@ -0,0 +1,95 @@
+package main
+
+import (
+	"fmt"
+	"io/fs"
+	"os"
+	"os/exec"
+	"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 RecordExtractor interface {
+	Extract(keyword string, path string, line int) Record
+}
+
+type StatRecordExtractor struct {
+	fileInfo fs.FileInfo
+}
+
+func NewStatRecordExtractor(absolutePath string) *StatRecordExtractor {
+	fileInfo, err := os.Stat(absolutePath)
+	kcore.Expect(err, "Error getting file info")
+
+	return &StatRecordExtractor{
+		fileInfo: fileInfo,
+	}
+}
+
+func (re *StatRecordExtractor) Extract(keyword string, path string, line int) Record {
+	return Record{
+		keyword: keyword,
+		path:    path,
+		line:    line,
+		date:    re.fileInfo.ModTime(),
+	}
+}
+
+type GoGitRecordExtractor struct {
+	blame *git.BlameResult
+}
+
+func NewGoGitRecordExtractor(head *object.Commit, path string) *GoGitRecordExtractor {
+	blame, err := git.Blame(head, path)
+	if err == object.ErrFileNotFound {
+		return nil
+	}
+	return &GoGitRecordExtractor{
+		blame: blame,
+	}
+}
+
+func (re *GoGitRecordExtractor) Extract(keyword string, path string, line int) Record {
+	return Record{
+		keyword: keyword,
+		path:    path,
+		line:    line,
+		date:    re.blame.Lines[line-1].Date,
+	}
+}
+
+type GitRecordExtractor struct {
+	repoPath string
+}
+
+func (re *GitRecordExtractor) Extract(keyword string, path string, line int) Record {
+	record := Record{
+		keyword: keyword,
+		path:    path,
+		line:    line,
+	}
+	gitArgs := []string{"blame", "-L", fmt.Sprintf("%d,%d", line, line), "--porcelain", path}
+	cmd := exec.Command("git", gitArgs...) // #nosec G204
+	cmd.Dir = re.repoPath
+	output, err := cmd.Output()
+
+	if err != nil {
+		panic(kcore.Wrap(err, fmt.Sprintf("Error running: git %s", strings.Join(gitArgs, " "))))
+	}
+
+	for _, blameLine := range strings.Split(string(output), "\n") {
+		if strings.HasPrefix(blameLine, "author-time ") {
+			timestamp, err := strconv.ParseInt(strings.TrimPrefix(blameLine, "author-time "), 10, 64)
+			kcore.Expect(err, "Error parsing timestamp")
+			record.date = time.Unix(timestamp, 0)
+			return record
+		}
+	}
+	kcore.Assert(false, "No date found in git blame output")
+	return Record{}
+}
-- 
cgit v1.3