Hat

Hat is a hackable modal text editor for modern terminals.

Features

Core functionality

• Modal text editing
  • Normal, select, select line, and insert modes
  • Basic motions (vim's e y o p a d D f c C b ^ $ 0 = J gJ * # etc.)
  • Unlimited undo/redo
  • System clipboard copy & paste (using xclip)
  • Find in buffer
• Text automation
  • Run external command on selection
  • Dot repeat last change
  • Multi repeat
  • Macros
• Tree-sitter syntax awareness
  • Syntax highlighting (24 bit color)
  • Indent alignment
• LSP support
  • Go to definition
  • Find references
  • Diagnostics
  • Completions w/ documentation
  • Hover
  • Rename
• Multi buffer
  • Buffer management
  • Find file
  • Find in files
• Scratch buffers
• Unicode support
• --printer mode

Functionality available in patches

Done	Name	Link
✔️	LSP highlight	patch/lsp-highlight
✔️	LSP code action	patch/lsp-code-action
✔️	LSP formatting	patch/lsp-formatting
✔️	Git hunk markers	patch/git-signs
✔️	Tree-sitter symbol picker	patch/ts-symbol-picker
✔️	Buffer centering	patch/buffer-centering
✔️	Autosave	patch/autosave
✔️	Relative line numbers	patch/relative-number
✔️	Auto-indent	patch/auto-indent
🚧	Windows support
🚧	MacOS support
🚧	Wayland support
🚧	Persistent undo
🚧	Persistent macros
🚧	Surround actions
🚧	Case actions
🚧	Marks
🚧	Comments
🚧	List mode (fill chars)

Philosophy

Software is:

• doing not more and not less than what the user needs
  • Every feature is implemented in the most simple and straightforward form: keep it simple, fast, and clear
• made for users capable of reading and customizing its source code
  • Source code can be read by users in one evening
  • External configuration is not necessary and discouraged
  • User manual documentation is not necessary, hacking documentation is encouraged (via HACKING.md)
• distributed as source code, compiled by the user
• not meant to be developed forever and its final state should be described by its feature set from the beginning
• extended either by the user directly, or by applying source code patches distributed as diff files
  • It is encouraged to share your extensions with others who can find it useful

See Hackable software for details.

Build, install, usage, configuration

See HACKING.md.

Contributing

See CONTRIBUTING.md.