Show HN: Twain, a diff viewer like Meld, but for the age of AI

A diff viewer for people who love Meld, but wanted it to be slightly different.

Things that are like Meld:

• intuitive and nice view of what changed to what, what was removed from where and added where;
• scrolling minimaps of changes;
• git support;
• fast.

Things we have that Meld doesn't:

• all files from a Git diff shown in the same view, sequentially;
• a file tree on the side, super fast;
• show either the full files or only the parts that changed, with granular revealing of the unchanged parts;
• tree-sitter-based syntax highlighting;
• the ability to comment on sets of changes and lines, and AIs can read these comments and add more from a CLI, like Hunk;
• the ability to search through the entire set of modified files.

Thins Meld has that we don't:

• merge;
• three-way comparisons;
• support for other version control systems;
• ability to edit the files directly.

Run twain in your project's directory. It can also compare other Git revisions, but that doesn't matter much for now.

Select lines and press C or right-click the mouse to leave a comment on them.

Tell your AI agent to look into twain comment --help so it can participate.

Download a binary or a Flatpak bundle from the latest release or build from source (needs GTK 4, GtkSourceView 5 and libadwaita):

cargo install --git https://github.com/andunieee/twain