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Wants to be the SLIME of Forth
Branch: master
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Programming language mode for Forth.

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Features in progress:

  • Recognises definitions and moves by balanced expressions.
  • Interact with a Forth session: enter commands, load files, evalutate expressions.
  • Display stack comment when moving the cursor over a word.
  • Edit block files.
  • Tab completion.
  • Query a running Forth about words, search order, etc.



M-x package-install forth-mode


git clone DIR

# Add to .emacs
(add-to-list 'load-path "DIR")
(require 'forth-mode)
(require 'forth-block-mode)
(require 'forth-interaction-mode)


To enable Forth major mode, type M-x forth-mode. The file extensions .f, .fs, .fth, and .4th are recognised automatically.

To start an interactive Forth session, type M-x run-forth.

Key bindings:

  • C-M-a, C-M-e - beginning / end of colon definition.
  • C-M-f, C-M-b - forward / backward expression (not very useful yet).
  • C-M-h - mark colon definition.
  • C-c C-l - load file.
  • C-c C-r - evaluate region.
  • C-c C-k - kill interactive Forth.
  • M-TAB, C-M-i - complete-symbol.
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