Pi Vim Motions Extension

Vim Motions extension and keybindings for pi

How to install

• pi install git:github.com/fredriksvensson/pi-vim-motions
• add into ~/.pi/keybindings.json:

{
  "tui.editor.cursorLeft": [
    "left",
    "ctrl+h"
  ],
  "tui.editor.cursorDown": [
    "down",
    "ctrl+j"
  ],
  "tui.editor.cursorUp": [
    "up",
    "ctrl+k"
  ],
  "tui.editor.cursorRight": [
    "right",
    "ctrl+l"
  ],
  "tui.select.down": [
    "down",
    "ctrl+n",
    "ctrl+j"
  ],
  "tui.select.up": [
    "up",
    "ctrl+p",
    "ctrl+k"
  ],
  "tui.editor.deleteToLineEnd": [
    "alt+k"
  ],
  "app.model.cycleForward": [
    "alt+p"
  ],
  "app.model.cycleBackward": [
    "shift+alt+p"
  ]
}

app.model.cycleForward, app.model.cycleBackward and tui.editor.deleteToLineEnd conflict with what is usually used by neovim for example as navigating selectors.

Usage

• Default mode: INSERT
• escape in INSERT → NORMAL
• escape in NORMAL keeps base escape/cancel behavior
• i in NORMAL → INSERT
• a in NORMAL → move right one char, then INSERT
• u in NORMAL → undo (supports counts, e.g. 2u)
• Unmapped printable keys in NORMAL are ignored (no text inserted)

Implemented commands (current)

Motions

• h / j / k / l: left/down/up/right
• w / b / e: word motions
• W / B / E: same as lowercase in current implementation
• 0 / ^: line start
• $: line end
• f<char>: find next matching char on line
• F<char>: find previous matching char on line
• gg: first line
• G: last line
• Counts in normal mode (3w, 5l, etc.)

Delete

• x: delete char under cursor (stores deleted char in register)
• d enters pending operator state
• Supported completions:
  • dd (delete current line, stores linewise)
  • dh / dl
  • dw / db / de / dW / dB / dE
  • d0 / d^ / d$
  • df<char> / dF<char>
• D: delete to end of line
• If second key is unsupported, delete is canceled with no text change
• escape cancels pending delete
• Counts supported (2x, 2dd, d2w)
• Mode stays NORMAL after delete commands

Change / Substitute

• C: change to end of line (delete to EOL and enter INSERT)
• S: substitute current line (clear line and enter INSERT)

Yank / Paste

• y enters pending operator state
• Supported completions:
  • yy (yank current line, linewise)
  • yw / yb / ye / yW / yB / yE
  • y0 / y^ / y$
  • yf<char> / yF<char>
• Y: yank to end of line
• p: paste after cursor (or below for linewise register)
• P: paste before cursor (or above for linewise register)
• If second key is unsupported, yank is canceled with no text change
• escape cancels pending yank
• Counts supported (y3w etc.)

Regression expectations

• INSERT mode keeps normal typing behavior
• enter submits
• shift+enter inserts newline
• Control/system shortcuts (like ctrl+c, ctrl+d) continue to work

Out of scope (v1)

In order of when its likely to be implemented:

• Visual mode
• redo: not implemented in pi itself
• Text objects (diw, ci(, etc.)
• Repeat (.), macros, named registers
• Search motions/repeats (/, ?, n, N, ;, ,)
• Full WORD/edge-accurate Vim parity
• ;/, repeat-find

Development

This is its own package with its own tooling so that its not depending on pi's environment for development. Just run pnpm install to pull necessary dependencies and pnpm test to run the test suite.

I added some basic agent related things and fallow. You can of course make a pull request if you have something you want to extend but please don't just let the coding agent go ham on it.

Otherwise raise an issue and I can have a look at it.

Next step in this is probably to tidy up the commands.ts and introduce a bit more extendable structure to it. I will see how I can extend pi. For now its more so I can edit text properly inside pi.