Commit cce1481

Eric Bower  ·  2026-05-11 23:35:11 -0400 EDT
parent a36f4fa 
feat: only write commit if file is missing

feat: only write tree files if shasum is different
1 files changed,  +58, -4
M main.go
M main.go
+58, -4
......@@ -2,10 +2,12 @@ package main
22
33 import (
44 "bytes"
5+ "crypto/sha256"
56 "embed"
67 "flag"
78 "fmt"
89 "html/template"
10+ "io"
911 "log/slog"
1012 "math"
1113 "os"
......@@ -332,6 +334,47 @@ func (c *Config) writeHtml(writeData *WriteData) {
332334 bail(err)
333335 }
334336
337+// writeHtmlIfChanged renders a template and only writes if content hash differs from existing file
338+func (c *Config) writeHtmlIfChanged(writeData *WriteData) {
339+ ts, err := template.ParseFS(
340+ embedFS,
341+ writeData.Template,
342+ "html/header.partial.tmpl",
343+ "html/footer.partial.tmpl",
344+ "html/base.layout.tmpl",
345+ )
346+ bail(err)
347+
348+ // render to buffer first
349+ var buf bytes.Buffer
350+ err = ts.Execute(&buf, writeData.Data)
351+ bail(err)
352+
353+ dir := filepath.Join(c.Outdir, writeData.Subdir)
354+ err = os.MkdirAll(dir, os.ModePerm)
355+ bail(err)
356+
357+ fp := filepath.Join(dir, writeData.Filename)
358+
359+ // compute hash of new content
360+ newHash := sha256.Sum256(buf.Bytes())
361+
362+ // compare with existing file
363+ if f, err := os.Open(fp); err == nil {
364+ defer f.Close()
365+ h := sha256.New()
366+ if _, err := io.Copy(h, f); err == nil {
367+ if bytes.Equal(h.Sum(nil), newHash[:]) {
368+ return // unchanged, skip
369+ }
370+ }
371+ }
372+
373+ c.Logger.Info("writing", "filepath", fp)
374+ err = os.WriteFile(fp, buf.Bytes(), 0644)
375+ bail(err)
376+}
377+
335378 func (c *Config) copyStatic(dir string) error {
336379 entries, err := staticFS.ReadDir(dir)
337380 bail(err)
......@@ -405,6 +448,7 @@ func (c *Config) writeRefs(data *PageData, refs []*RefInfo) {
405448 }
406449
407450 func (c *Config) writeHTMLTreeFile(pageData *PageData, treeItem *TreeItem) string {
451+ d := filepath.Dir(treeItem.Path)
408452 readme := ""
409453 b, err := treeItem.Entry.Blob().Bytes()
410454 bail(err)
......@@ -419,15 +463,13 @@ func (c *Config) writeHTMLTreeFile(pageData *PageData, treeItem *TreeItem) strin
419463 bail(err)
420464 }
421465
422- d := filepath.Dir(treeItem.Path)
423-
424466 nameLower := strings.ToLower(treeItem.Entry.Name())
425467 summary := readmeFile(pageData.Repo)
426468 if d == "." && nameLower == summary {
427469 readme = contents
428470 }
429471
430- c.writeHtml(&WriteData{
472+ c.writeHtmlIfChanged(&WriteData{
431473 Filename: fmt.Sprintf("%s.html", treeItem.Entry.Name()),
432474 Template: "html/file.page.tmpl",
433475 Data: &FilePageData{
......@@ -450,12 +492,22 @@ func (c *Config) writeLogDiff(repo *git.Repository, pageData *PageData, commit *
450492 if hasCommit {
451493 c.Logger.Info("commit file already generated, skipping", "commitID", getShortID(commitID))
452494 return
453- } else {
495+ }
496+
497+ // skip if output file already exists from a previous run
498+ commitPath := filepath.Join(c.Outdir, "commits", commitID+".html")
499+ if _, err := os.Stat(commitPath); err == nil {
500+ c.Logger.Info("commit file exists, skipping", "commitID", getShortID(commitID))
454501 c.Mutex.Lock()
455502 c.Cache[commitID] = true
456503 c.Mutex.Unlock()
504+ return
457505 }
458506
507+ c.Mutex.Lock()
508+ c.Cache[commitID] = true
509+ c.Mutex.Unlock()
510+
459511 diff, err := repo.Diff(commitID, 0, 0, 0, git.DiffOptions{})
460512 bail(err)
461513
......@@ -1138,3 +1190,5 @@ func main() {
11381190 url := filepath.Join("/", "index.html")
11391191 config.Logger.Info("root url", "url", url)
11401192 }
1193+
1194+// modified