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175 Stars 3 Forks MIT License 616 Commits 0 Opened issues


Intuitive S-expressions editing for Clojure(Script).

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Calcit Editor

Intuitive S-expressions editing for Clojure(Script).

  • Auto Layout: expressions in blocks and inline-blocks, styled with CSS
  • Tree Editing: intuitive way of structural editing as nested expressions
  • Call Stack Navigation: more fine-grained functions navigation
  • Collaboration: changes real-time synced among multiple clients via WebSockets

One function/definition in a screen,

Command d
to open called function at next tab,
Command j
Command k
Command i
to switch:

Expression editor

Based on DOM/CSS, easy for another theme:


Command p
to search and jump inspired by Sublime Text :

Search panel

Browse namespaces and functions/variables:

Definitions browser


npm CLI of calcit-editor

Install CLI and start a local WebSocket server, it uses

as a snapshot file:
npm i -g calcit-editor

UI of the editor is a webapp on

You may try with my project templates:

or even clone current repo for trying out.

Don't forget to check out keyboard shortcuts. My old introduction videos can be found on YouTube.


CLI variables for compiling code directly from

op=compile calcit-editor

The web UI takes several query options:
  • port
    , defaults to
  • host
    , defaults to
    , connects via WebSocket

By default, ClojureScript code is emitted in

by pressing
Command s
. When server is stopped with
Control c
is also updated.

There are also several options in

field in
  • port
    , defaults to
  • output
    , defaults to
  • extension
    , defaults to

Editor UI is decoupled with WebSocket server, so it's okay to connect remote server from multiple pages with all expressions synced in real-time.

Also there's a local version of web editor to enable:

ui=local calcit-editor
# serving UI at http://localhost:6101

Compact output

It's now also splitted into .

compact=true caclcit-editor


:compact-output? true
is specified in
, "Compact Mode" is activated. Clojure(Script) will no longer be emitted, instead two files will be emitted:
  • compact.cirru
    contains a compact version of data tree of the program.
  • .compact-inc.cirru
    contains diff information from latest modification of per definition.

It's not useful for Clojure but would can be used for other experiments in calcit-runner.


Based on



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