ZDDC/browse/README.md
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feat(browse): generic directory listing tool — default at folder URLs
A new HTML tool — browse — that lists the contents of any directory.
Designed for ZDDC archives but no ZDDC-specific filtering; just a
straight folder browser with expand/collapse, sort, and name filter.

Modes (auto-detected at page load):
  - Online: when served by zddc-server at a folder URL, queries
    the same URL with Accept: application/json to load the listing
    and renders it. Auto-served as the default at any directory
    under ZDDC_ROOT without an index.html (replacing the previous
    minimal-HTML stub from directory.go).
  - Local: 'Select Directory' button uses FileSystemAccessAPI to
    pick any folder on disk; works in Chromium-based browsers.

Features (Phase 1 — what's in this commit):
  - Tree view with lazy-loaded folders (children fetched on first
    expand).
  - Sort by name / size / extension / date (column header click).
  - Filter by name substring (toolbar input).
  - File click opens in a new tab — for server-backed pages,
    routes through zddc-server's normal handler so .archive
    redirects + apps cascade overrides + ACL all apply.

Phase 2 deferred:
  - ZIP files inline expansion (treat archive entries as virtual
    children).
  - File preview popup (reuse shared/preview-lib.js).
  - Extension multi-select filter.

Wiring:
  - browse/ added to top-level ./build's per-tool list, embed
    block, versions.txt, and the lockstep release commit + tag set.
    All seven tools (archive, transmittal, classifier, mdedit,
    landing, form, browse) advance together on stable cuts.
  - shared/build-lib.sh: browse added to ZDDC_RELEASE_TOOLS and
    verify_channel_links's per-tool loop.
  - zddc/internal/apps/embed.go: //go:embed browse.html +
    EmbeddedBytes("browse") case.
  - zddc/internal/apps/availability.go: browse available at every
    directory (same as archive).
  - zddc/internal/apps/handler.go: MatchAppHTML routes
    /<dir>/browse.html → 'browse'.
  - zddc/internal/handler/directory.go: when a directory request
    arrives with Accept: text/html and no index.html exists,
    serve the embedded browse.html bytes (with a JSON-fallback
    if the embedded slot is empty during bootstrap).
2026-05-03 19:56:51 -05:00

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Markdown

# browse — directory listing tool
Generic file browser for any directory. Designed to work with ZDDC
archives but useful for any folder. Single-file HTML, no install.
## How it's used
Two modes, auto-detected at page load:
1. **Online (zddc-server backed).** When this HTML is served by
zddc-server at a folder URL — which it is by default for any
directory under `ZDDC_ROOT` that doesn't have an `index.html`
the JS queries the same URL with `Accept: application/json` to
load the directory's listing and renders it as a sortable,
filterable table.
2. **Local (FileSystemAccessAPI).** Click "Select Directory" in the
header to pick any folder on your computer. Works in
Chromium-based browsers (Chrome, Edge, Brave, etc.). No server
required; the directory is read directly from disk.
## What it does
- Lists files and folders with name, size, type (extension), and
modified date.
- Click a folder to expand inline. Children load lazily on first
expand.
- Click a column header to sort by that column. Click again to
reverse.
- Type in the filter to narrow to entries whose name contains the
substring.
- Click any file to open it in a new tab — for server-backed pages,
this routes through zddc-server's normal handler (so an `.archive`
redirect, an apps cascade override, etc. all work as expected).
## Design notes
- **No ZDDC-specific filtering.** This tool is intentionally
domain-agnostic. The companion `archive` tool layers ZDDC
parsing (project / status / revision filters, tracking-number
resolution) on top of the same listing API. Use `archive` when
you want ZDDC semantics; use `browse` when you just want to see
what's in a folder.
- **Default at directory URLs.** zddc-server's `directory.go`
serves the embedded browse.html bytes for any directory request
with `Accept: text/html` and no `index.html` present. This
means a user navigating to any folder under `ZDDC_ROOT` gets a
usable browser without anyone having to drop a file into the
archive.
- **Apps cascade override.** Like every other ZDDC tool, the
served `browse.html` can be overridden per-folder via a `.zddc
apps:` entry. The default is the embedded copy from the binary;
operators can pin a specific version or URL if they want.