patchtree

Render raw .diff/.patch pages as a colored diff with tree-sitter syntax highlighting

patchtree turns a plain .diff or .patch page into the code review interface you would get on a merge or pull request — but on the raw diff itself, on any host. Open a diff URL such as https://gitlab.example.com/group/project/-/merge_requests/104.diff or click the toolbar icon on any MR/PR page and review right there. Local .diff / .patch files opened via file:// work too. REAL SYNTAX HIGHLIGHTING, NOT REGEX COLOURING Most diff viewers paint patches with regular expressions, so a template string, a nested generic or a bash heredoc quietly falls apart. patchtree runs the real grammars instead — the same tree-sitter parsers Neovim, Helix and Zed use — compiled to WebAssembly and executed in the extension's background worker. · A real parse tree per file, so nesting is never guessed: markup embedded in code, generics, macros, shell heredocs and template actions inside config files all keep their structure. · 30 bundled grammars, each pinned to the revision its highlight queries were written for, covering the mainstream compiled and scripting languages plus the config, markup and infrastructure formats a review touches. The current list is in the project README. · Language injection, the way editors do it: a fenced code block inside a document is parsed with that language's own grammar, the prose around it with the document grammar, and template actions layer over the config file beneath them. · Parsing runs off the main thread and grammars load lazily, one per language a diff actually contains, so a 10 000-line diff never blocks scrolling. · Word-level diff sits under the syntax colours: you see what changed and what it means at once. · A language with no bundled grammar still gets highlighted, through highlight.js. Files with no extension are identified by their shebang, then by auto-detection. DIFF RENDERING · Any plain-text .diff / .patch page, whatever served it — git-format or a plain diff -u, GitLab, GitHub, or a local file. · The change explains itself first: a request shows its title and description (rendered markdown, long ones collapsed, switchable in settings), and a git format-patch file shows its commit message with mail headers, diffstat and links highlighted. · Inline and side-by-side views; fully added or deleted files use the full width in split mode. · Expand hidden lines between hunks, or switch a file to its full contents. · Large diffs stay smooth — only visible file sections are rendered. NAVIGATION · Resizable, filterable file tree: the filter matches paths and diff content, with status icons, per-file +N -M and comment-count badges. · Viewed checkboxes with a progress counter, one-click reset, fold/unfold, and auto-collapsed generated files (lock files, *.pb.go, vendor/, minified). The tree carries them per file and per folder — a folder covers everything under it and folds itself once fully read, reload included. · Keyboard, bound to physical keys so any layout works: j/k files, n/p threads, v viewed, x fold, s inline/side-by-side, e file tree, / filter, ? all shortcuts. · Per-commit diff picker: rows show subject, author and date, copy the full sha or open the commit on the host, with a filter field on long branches. · Copy-path, open-at-head, and line permalinks. · Request summary in the toolbar: a state chip (Open / Draft / Merged / Closed) then who is merging which branch into which, and when. · The way back: the state chip links to the request, and the toolbar icon works both ways — request to diff, diff to request, re-using the tab you came from. REVIEW (WITH AN ACCESS TOKEN) · Threads anchored to lines, on the old or new side, with replies, editing and deletion of your own comments. · Markdown editor with a toolbar and Write/Preview tabs, rendered through the platform's own markdown API. · Suggestions: one click prefills a suggestion block; existing ones render as a red/green widget with Apply (GitLab). · Multi-line comments — shift-click or drag over line numbers. · Resolve/unresolve threads and an unresolved badge that lists every open one — location, comment, author, age, reply count — to jump to it or resolve it right there, with a filter on long lists. · Draft reviews and a Submit-review panel: Comment / Approve / Request changes, with the approval state shown as a badge. · Pipeline status that opens up: the toolbar badge lists the jobs behind it (name, stage, state, a click to the log), and the Approve option warns while the pipeline is red — so a broken build is hard to approve by accident. · Merge-conflict indicator in the toolbar. APPEARANCE · Theme gallery with the base24 schemes from tinted-theming, live code previews (including how added and removed lines look), light/dark filter, and paste-your-own scheme YAML. · Bundled fonts (JetBrains Mono, Inter, Nerd Font builds) or any local font by name; separate UI and code font sizes, tab width, italic-comment and ligature toggles. SETUP · Rendering needs no account. To turn on review actions, open the gear menu → Access tokens and add a GitLab host (personal access token, api scope) and/or a GitHub token (classic repo, or fine-grained with Pull requests read/write). · Chrome: keep Site access at "On all sites" (or grant your hosts explicitly), otherwise the content script is not injected. To render local files, allow access to file URLs in the extension's details page. PRIVACY patchtree talks only to the host serving the diff and that host's API (GitLab/GitHub) to render diffs and post your review actions. Access tokens are entered by you, stored locally, and never synced or sent anywhere else. No analytics, no tracking, no third-party servers. Open source, Apache-2.0: https://github.com/danilrwx/patchtree