Since this package makes use of built-in treesitter mode this package requires GNU Emacs 29.1+.


dwim-coder-mode is a Rube Goldberg machine (but simpler and one that works) mode for GNU Emacs. Currently good support for C, Python, and Rust programming are included.

dwim-coder-mode hacks around the characters as you type in the buffer to do various stuff often reducing the effort to accomplish something.

Say for example, in c-ts-mode, pressing space bar often inserts _ or sometimes real spaces depending on the context. It also inserts - when inside #include header names.

If you find this useful, you may:

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Figure 1: dwim-coder-mode demo

Source: GitLab SourceHut


It's known that GNU Emacs is extremely extensible, and when I was first introduced to GNU Emacs, I decided to do something weird. I liked the idea of dwim which is very popular in the Emacs world, and I wanted to reduce as much keystrokes to write my code. I wrote some elisp hacks to do so, which worked really great.

Since I has been using this in my personal config for quite some time, I decided to write a mode for that which is more maintainable.


dwim-coder-mode requires GNU Emacs 29.1+ with treesitter support. dwim-coder-mode requires electric-pair-mode to work properly.

The following modes are also recommended for proper working of the mode: electric-operator (for autospace around operators), ws-butler (to trim whitespace in modified lines).

Install using use-package

You can installl dwim-coder-mode from melpa unstable.

(use-package dwim-coder-mode
  :ensure t
  :hook ((c-ts-mode python-ts-mode rust-ts-mode) . dwim-coder-mode))

Install from git

emacs --batch --eval='(package-vc-install "https://gitlab.com/sadiq/dwim-coder-mode")'


| in the examples is the cursor point. You can always do C-q key when do you wan't dwim-coder-mode to act crazy for the given key.

Utmost care has been taken to avoid tracking CPU heat when spacebar is pressed, so as to avoid possible break of your workflow on future software updates.

See tests in ./tests/*/*-tests to see the complete list of available hacks.

c-ts-mode, python-ts-mode, rust-ts-mode

  • S-SPC (shift + space)
    • insert real space (may not work without a GUI)
  • . key
    • .. => (|)
  • pressing space bar
    • gtk| => gtk_|
  • ' key
    • gtk_window| => GTK_WINDOW|
    • GTK_WINDOW| => GtkWindow|
  • , key
    • power, | => power = |
      • comma twice inserts '='
  • ; key - move to the end of current statement
    • power = pow(3, 4|) => power = pow(3, 4)|


  • , key
    • #include, => #include <|>
    • #include <,> => #include "|"
    • func(|) => func(&|)
    • func(&|) => func(*|)
  • " key
    • gtk_window| => GtkWindow *|
  • pressing space bar
    • foo_| => foo->| (ie, pressing space bar twice gives ->)
    • foo->| => foo__|
    • #include <example|> => #include <example-|>
    • func(|) => func(_|)


  • pressing space bar
    • foo_| => foo::| (ie, pressing space bar twice gives ::)
    • foo::| => foo__|
    • func(|) => func(_|)
  • , key
    • func(|) => func(&|)
    • func(&|) => func(*|)


electric-pair-mode or similar should be enabled for dwim-coder-mode to work You shall have to type using keyboard or so. Copy paste won't work



// , and ; shall be intercepted

// .. and { shall be intercepted
int main..{
// Here, 'double-quote', ,', and ';' shall be intercepted
const char"str,,"Hello, World;;;"
// .. and ';' shall be intercepted


#include <stdio.h>

main (void)
  const char *str = "Hello, World";
  puts (str);



# ',' shall change to # in the following line
,Show Hello World

# Here, SPC means pressing space bar, also .. shall change to ()
# The ; shall move the cursor to the end of the line
# The space around SPC is put for better visibility, not one you would type
def show SPC hello..;:;
    # .. in the following line shall change to ()
    print.."Hello, World"

# SPC and .. are interecepted again
show SPC hello..


#Show Hello World

def show_hello():
    print("Hello, World")


Other files

You can enable dwim-coder-mode in any mode derived from prog-mode or conf-mode. Also, it's possible to use file local variables to set config.

Input: weston.ini file

# -*- dwim-coder-auto-space: nil; dwim-coder-space-char: ?- -*-

# ; moves cursor to the end of line
# SPC means pressing space bar, which will result in -
# ,, will change to =
# space around SPC is given only for visibility
enable SPC tap,,true


# -*- dwim-coder-auto-space: nil; dwim-coder-space-char: ?- -*-


See also


Written in 2022-2023 by Mohammed Sadiq <sadiq@sadiqpk.org>

To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide. This software is distributed without any warranty.

You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see the license online.