A fast, cross-platform media renamer — a ground-up rewrite of FileBot (via its FB-Mod fork), built from scratch as its own project: new stack, new architecture, new branding.

Status: early scaffold, but the core loop works end to end. The naming-expression engine is ported and tested, the faithfully-recreated two-pane UI is wired to real native file/folder loading and drag-and-drop, local filename-based season/episode and movie title/year detection ("Match") is working, real online metadata lookups against TMDB ("Fetch Data") are working for both TV episodes and movies — including fuzzy title disambiguation, so a search that returns several similarly-named results doesn't just take TMDB's top-ranked hit — and the actual on-disk operation is wired up (with a confirmation step showing the full old-path/new-path plan before anything touches disk, a per-row ✕ to drop an individual file from that plan at the last step, a Move/Copy/ Symlink selector for what to actually do at each target, and — independently — a Skip/ Auto-number/Override selector for what happens when the computed name already exists: leave it alone (the original, and still default, behavior), save alongside it as "Name (1).ext", or replace it outright). It can also organize files into subfolders — including ones that don't exist yet — when the naming scheme includes a /. Every completed batch is logged to a history panel that can undo it (moving files back for Move, or just removing what was created for Copy/Symlink — undoing always uses its own skip-on-conflict policy regardless of what the original rename used, so an undo can never overwrite something else as a side effect). A single loaded batch can freely mix TV episodes and movies — each file only fills in the fields that apply to it. "Match" also parses release-tag text straight out of the filename — resolution, source (BluRay/HDTV/WEB-DL/…), video/audio codec, release group — so naming schemes can reference {resolution}/{source}/{video codec}/{audio codec}/{release group} (or FileBot's own {vf}/{source}/{vc}/{ac}/{group}) without a media prober; the rest of FileBot's full media-metadata bindings (real probed video/audio stream info) are not yet ported. The Align Up/Down buttons reorder the (shared) file list — the two panes always stay positionally paired — and up to 9 naming schemes can be saved as presets, recalled with a click or a 1-9 keypress (persisted locally, same pattern as Settings/History). See "Porting roadmap" below.

The naming scheme is fully user-editable from the app (the "Naming Scheme" button next to the New Names list) — the default is {show name} - {season number}x{episode number} - {episode name}, but it's just a starting point, not a fixed template. Plain, human-readable, multi-word field names like {show name} work directly (no Rhai knowledge needed), FileBot's own short field names ({n}, {s00e00}, {t}) still work side by side with them, and real Rhai script is available for anyone who wants it (e.g. {show name.to_upper()}). See "Naming scheme syntax" below for how that's implemented.

Why a rewrite, and why this stack

The original is a ~20k+ line Java/Swing app built with Ant. The goals were: faster startup and UI, faster matching/renaming, a codebase that's actually pleasant to work in, and a genuine rebrand — not a coat of paint.

Aurora Curator is Tauri: a Rust core (crates/aurora-curator-core, src-tauri) plus a TypeScript/React frontend (src), compiled to a small native binary per platform (Windows/macOS/Linux) with a system webview instead of shipping a bundled browser engine. That's the concrete "faster" win over both the original JVM/Swing app and an Electron-style rewrite: quick cold start, small binary, real OS-native windowing.

An earlier attempt used Kotlin + Compose Multiplatform to stay on the JVM and reuse FileBot's Java logic directly. That was abandoned (nothing was salvaged into this repo) after discovering the sandbox this was originally built in blocks Maven Central and the Gradle Plugin Portal, making it impossible to compile or test. Tauri was chosen as the replacement because both halves — Cargo via crates.io, npm via the public npm registry — are reachable, so every piece described as "done" below is actually compiled/tested, not just written and hoped for.

Compatibility notes

Goal: keep CLI flags, config file locations, and the outer { } naming-scheme template syntax compatible with FileBot conventions, so existing automation mostly keeps working.

One deliberate gap: FileBot's { } expressions ran arbitrary Groovy code (JVM-only). Aurora Curator's Rust core has no Groovy engine, so expressions are evaluated with Rhai instead. Simple bindings ({n}, {s00e00}, {t}) are identical. More complex chained-method expressions will need small syntax tweaks (e.g. Groovy's .toUpperCase() → Rhai's .to_upper()) — Rhai already ships most of the common string/array methods FileBot's expression helpers wrapped, so most patterns translate directly.

Naming scheme syntax

Every { } token in an expression is resolved in this order (crates/aurora-curator-core/src/format/expression.rs::compile_scriptlet):

A single bare identifier ({n}, {season}) is a direct binding lookup — the fast path, and how FileBot's own short field names keep working unmodified.
Otherwise it's compiled as Rhai script ({n.to_upper()}, {n + " " + t}) — real code, with every current binding available as a script variable.
If it's neither a valid identifier nor valid Rhai, but it still only contains letters, digits, underscores and spaces (e.g. {show name}, {episode number}), it falls back to a literal multi-word binding key instead of raising a syntax error — this is what lets a human-typed field name with spaces work as a plain lookup without anyone needing to know Rhai. Anything that isn't a plausible field name (stray punctuation, unmatched brackets, etc.) still surfaces as a real syntax error at that point, exactly as before.

An undefined binding contributes an empty string rather than failing outright (so {n}{missing} still renders); the overall expression only errors if the total rendered output would be empty.

/ between two { } scriptlets (or anywhere in the literal text) needs no special handling in the expression engine at all — it's just ordinary literal text, the same as a space or a dash. It only becomes meaningful one layer up, at rename time (see "Organizing into subfolders" below): a scheme like {show name}/{episode name} renders to a name containing a real /, and the rename engine treats that as "put this file in a subfolder" rather than rejecting it.

Organizing into subfolders

A naming scheme that includes / (e.g. {show name}/Season {season number}/{episode number} - {episode name}) moves the file into that subfolder as part of renaming, creating any missing intermediate folders automatically (crates/aurora-curator-core/src/rename/mod.rs::rename_one → fs::create_dir_all). This is still always scoped to the file's own directory tree — the target is resolved relative to the source file's parent directory, never as an absolute path, and every path component is validated (validate_relative_target) to reject empty segments (a leading, trailing, or doubled / — which also catches an absolute-looking /etc/passwd-style path), ./.. segments, and backslashes (Aurora Curator always uses / for the naming scheme's folder separator regardless of OS). If the resolved target already exists and isn't the same underlying file, what happens next is up to the chosen conflict policy — Skip (default), Auto-number, or Override; see item 6 of the porting roadmap below for the full behavior of each.

Project layout

crates/aurora-curator-core/   Pure Rust core: naming-expression engine (ported), local
                       filename-based season/episode *and movie title/year* matching
                       (ported, `matching/`), plus filename-based release-tag parsing in
                       the same module (`guess_release_info` — resolution, source, video/
                       audio codec, release group), text-similarity scoring for
                       disambiguating search results (`similarity/`, partial
                       `EpisodeMetrics` port), a TMDB metadata client (`web/tmdb.rs` — TV
                       search + episode lookup
                       and movie search + lookup, both disambiguated via `similarity/`,
                       tested against a mocked HTTP server via `mockito`), the on-disk
                       rename engine (`rename/` — Move/Copy/Symlink actions,
                       Skip/Auto-number/Override conflict policies, can also organize
                       into (auto-created) subfolders when
                       the naming scheme includes `/`) — and a rename history/undo log
                       (`history/`, a partial `HistoryDialog` port, undo-aware of which
                       action produced each batch). Not yet ported: full media metadata
                       bindings, other web datasource clients (TVDB/AniDB/etc).
                       No Tauri dependency, so it builds and unit-tests standalone.
src-tauri/             Tauri app shell: exposes aurora-curator-core as commands to the frontend
                       (naming-scheme rendering, filename matching for both TV and
                       movies, TMDB metadata fetch — `metadata.rs` for TV episodes,
                       plus a movie-fetch command alongside it — executing a rename
                       plan, native file/folder dialogs, drag-and-drop expansion), plus
                       `settings.rs` (TMDB token), `history.rs` (rename history/undo
                       log), and `presets.rs` (up to 9 saved naming schemes) — all three
                       stored as JSON in the OS app-config directory — app
                       metadata/icons/window config (tauri.conf.json).
src/                   React + TypeScript UI (Vite). Faithful recreation of the original
                       two-pane rename screen (Aurora theme) wired to real file loading,
                       drag-and-drop, live naming-scheme preview, local TV/movie
                       matching, TMDB fetch for both (behind a Settings modal for the
                       API token), a confirm-before-touching-disk modal for the actual
                       rename, a History panel that can undo a past rename, Align Up/Down
                       list reordering, and a Presets panel (plus `1`-`9` hotkeys) for
                       saved naming schemes.
scripts/gen_icons.py   Regenerates src-tauri/icons/ (placeholder branding — swap the
                       colors/glyph in the script, or replace the icons directly, to
                       change the look).

Building

Prerequisites: Rust (stable) + Cargo, Node.js 18+, and Tauri's platform prerequisites (see https://v2.tauri.app/start/prerequisites/ — on Linux this means libwebkit2gtk-4.1-dev libgtk-3-dev libayatana-appindicator3-dev librsvg2-dev and a C toolchain; macOS/Windows need Xcode / the VS Build Tools + WebView2 respectively).

# Rust core (no UI deps needed):
cargo test -p aurora-curator-core

# Full app in dev mode (opens a native window):
npm install
npm run tauri dev

# Production build (installer/bundle for your current OS):
npm run tauri build

Verified in the environment this was built in: cargo test -p aurora-curator-core (all passing, including the TMDB client tests — those run against a local mock HTTP server via mockito, no live network or API key needed to build/test), cargo check -p aurora-curator (compiles clean against real Tauri + GTK/WebKit system libraries), and npm run build (TypeScript type-checks, Vite bundles). The actual GUI window has not been visually verified anywhere yet — that sandbox has no display. Run npm run tauri dev on your machine to see and click through it for the first time.

Setting up TMDB (for "Fetch Data")

Everything else in the app works fully offline; "Fetch Data" is the one feature that needs a (free) TMDB account:

Create a TMDB account, then go to Settings → API in your account and generate an API Read Access Token (not the older numeric "API Key" — Aurora Curator uses the Bearer token method TMDB documents as the default).
In the app, click the key icon ("TMDB Settings") next to Fetch Data and paste the token in. It's saved locally in the OS app-config directory and only ever sent to api.themoviedb.org.

Porting roadmap (not yet done)

Roughly in priority order — each references the original FileBot source file it's ported from, for anyone picking this up:

Full naming-scheme bindings — net.filebot.format.MediaBindingBean (1354 lines): all the {n}, {s00e00}, {airdate}, {vf} (video format), etc. binding properties. A filename-tag-based subset is now ported and wired to "Match" (guess_release_info in crates/aurora-curator-core/src/matching): {vf}/{resolution}, {source}, {vc}/{video codec}, {ac}/{audio codec}, {group}/{release group}. What's still missing is everything MediaBindingBean derives from actually probing the media file (real video/audio stream resolution, duration, bitrate, frame rate, file size/hash, etc.) — Aurora Curator ships no ffprobe/MediaInfo dependency, so those bindings only work when a release name happens to carry the info as text.
String/expression helper methods — net.filebot.format.ExpressionFormatMethods (636 lines): FileBot-specific Groovy string extensions like .pad(), .sortName(). Only a small subset (any, all_of, concat) is ported so far (crates/aurora-curator-core/src/format/functions.rs); Rhai's built-ins cover some of the rest already.
Matching/similarity engine — net.filebot.similarity.*. Local filename-based season/episode detection is done (crates/aurora-curator-core/src/matching, ported from the pattern-matching half of SeasonEpisodeMatcher.java, adapted to Rust's regex crate which lacks lookahead/lookbehind — wired to the "Match" button), and so is a local movie title/year heuristic (guess_movie in the same module) used as a fallback whenever a filename carries no season/episode marker — a release name is either a TV episode or a movie, never both. Title disambiguation is also done (crates/aurora-curator-core/src/similarity, a partial port of the scoring idea behind EpisodeMetrics.java's fuzzy title-matching cascade — Sorensen-Dice similarity over normalized-title character bigrams), shared by both the TV and movie TMDB lookups: "Fetch Data" picks whichever TMDB search result is textually closest to the local guess rather than just trusting TMDB's relevance/popularity-ranked first hit, and reports "not found" instead of guessing when nothing in the results is a plausible match at all. DateMatcher (numbering/air-date-based identification, the other half of the original EpisodeMetrics) is not ported — Aurora Curator doesn't do date-based episode identification.
Media detection — net.filebot.media.MediaDetection (1356 lines): ties file-name parsing + matching together to auto-identify what a file is.
Web datasource clients — net.filebot.web.* (~40 files): TheMovieDB, TheTVDB, AniDB, OMDb, TVmaze, OpenSubtitles, etc. TMDB is done for both TV and movies (crates/aurora-curator-core/src/web/tmdb.rs, reqwest + serde_json, Bearer-token auth) — search-by-name plus per-season episode lookup for TV, search-by-title (optionally narrowed by release year via TMDB's own primary_release_year filter) for movies — both wired to "Fetch Data", disambiguating multi-result searches via the similarity-scoring pass described in item 3 above rather than blindly trusting TMDB's top-ranked hit. All other sources (TheTVDB, AniDB, OMDb, TVmaze, OpenSubtitles) are not yet started.
Rename engine + CLI — net.filebot.cli.CmdlineOperations (1235 lines) and ArgumentBean (415 lines, the full flag surface: -rename, --db, --format, --action, --conflict, -get-subtitles, -script, etc.). The rename operation is done (crates/aurora-curator-core/src/rename, wired to the UI's Rename button behind a confirmation step) including the move-into-subfolder --action variant — a naming scheme like {n}/{s00e00} organizes files into subfolders, creating any missing folders automatically, always scoped to the file's own directory tree. The copy/symlink --action variants are done too — an action selector in the confirmation modal picks Move/Copy/Symlink for the whole batch; Copy and Symlink both leave the source file untouched and produce a new file/link at the computed target, and both are undoable from the History panel the same as Move (undo for Copy/Symlink just removes what was created, since there's nothing to move back). The --conflict variants are done too — a second selector in the same modal picks Skip (default, leaves the conflicting file alone), Auto-number ("Name (1).ext", counting up to the first free slot), or Override (replaces the conflicting file outright — the one irreversible option, called out with red styling in the UI; undoing that batch later restores the source, never what got overwritten, since undo always uses its own fixed skip-on-conflict policy no matter which policy the original rename used). Not yet done: the CLI flag surface itself.
The rest of the UI — the Rename panel (file loading, drag-drop, live preview, local TV/movie matching, confirmed rename with per-item exclude, rename history/undo, Align Up/Down reordering, naming-scheme Presets with 1-9 hotkeys) is built; the other five sidebar panels (Episodes/Subtitles/SFV/Filter/List) are still stub screens. Align Up/Down is button-based (swaps the selected file with its neighbor), not the original's drag-and-drop-within-a-list interaction.
Undo/history for renames — done, as a flat JSON-backed undo stack rather than a full port of net.filebot.HistoryDialog's session/element log (crates/aurora-curator-core/src/history, src-tauri/src/history.rs). Every successful rename is recorded to a history.json in the OS app-config directory (same location as settings.json); the History panel lists past batches and can revert one back to its original paths, skipping (never overwriting) any file whose original path now has something else at it. Capped at the 50 most recent batches.
Packaging — code signing, auto-update, installers per platform via npm run tauri build.