c3b7db7114
- comics: reads pages straight out of the archive on demand. No extraction pass, so a 200-page CBZ is not materialised for a reader who views three pages. Pages are read into memory and served via http.ServeContent, which gives Range for free. - natural page ordering: page2 sorts before page10. Lexical ordering shuffles a numbered archive, which is the difference between a readable book and a scrambled one. - skips __MACOSX and dotfiles; rejects archives with no images. - cover is the first page. - media.Item gained ModTime (from the backing file) so page responses carry a Last-Modified and support conditional GETs. - web: ComicReader with a bounded prefetch window (two pages each way), page jump, keyboard nav, and progress stored as a page number. Verified: 3-page CBZ served in natural order, out-of-range 404, cover from page 1, progress round-trip. svelte-check 0/0.
52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package comics
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import (
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"context"
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"database/sql"
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"fmt"
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"os"
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"path"
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"path/filepath"
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"strings"
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"github.com/mithral/vellum/internal/media"
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)
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func init() {
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media.RegisterCoverExtractor(Kind, ExtractCover)
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}
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// ExtractCover writes the first page of the archive into the cache and returns
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// its path. A comic's first page is its cover by convention.
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func ExtractCover(ctx context.Context, db *sql.DB, item media.Item, absPath, cacheDir string) (string, error) {
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pages, err := ListPages(absPath)
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if err != nil {
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return "", err
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}
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dir, err := media.CoverCacheDir(cacheDir, Kind)
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if err != nil {
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return "", err
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}
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ext := strings.ToLower(path.Ext(pages[0].Name))
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if ext == "" {
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ext = ".jpg"
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}
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outPath := filepath.Join(dir, fmt.Sprintf("%d%s", item.ID, ext))
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data, err := ReadPage(absPath, pages[0].Name)
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if err != nil {
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return "", err
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}
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tmp := outPath + ".tmp"
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if err := os.WriteFile(tmp, data, 0o640); err != nil {
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return "", fmt.Errorf("comics: write cover: %w", err)
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}
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if err := os.Rename(tmp, outPath); err != nil {
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_ = os.Remove(tmp)
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return "", err
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}
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return outPath, nil
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}
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