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Hi-Angel authored and ankurdave committed 75a8375 Jun 1, 2020
color-identifiers-mode.el: python, highlight typed function arguments
E.g. args in code like

    def func(a: int, b: str = None)

Signed-off-by: Konstantin Kharlamov <>


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Color Identifiers Mode

Color Identifiers is a minor mode for Emacs that highlights each source code identifier uniquely based on its name. It is inspired by a post by Evan Brooks.

Currently it supports Scala (scala-mode2), JavaScript (js-mode and js2-mode), Ruby, Python, Emacs Lisp, Clojure, C, C++, Rust, Java, and Go. You can add support for your favorite mode by modifying color-identifiers:modes-alist and optionally calling color-identifiers:set-declaration-scan-fn.

Check out the demo.

Screenshot of Color Identifiers Mode on Scala

It picks colors adaptively to fit the theme:

Different Themes

Use M-x color-identifiers:regenerate-colors after a theme change.


Color Identifiers is in MELPA. First set up MELPA:

(add-to-list 'package-archives
             '("melpa" . "") t)

Then install it:

(package-install 'color-identifiers-mode)

Finally, visit a supported file and type M-x color-identifiers-mode.

If you like it, enable it for all supported files by adding the following to your init file:

(add-hook 'after-init-hook 'global-color-identifiers-mode)


To make the variables stand out, you can turn off highlighting for all other keywords in supported modes using a code like:

(defun myfunc-color-identifiers-mode-hook ()
  (let ((faces '(font-lock-comment-face font-lock-comment-delimiter-face font-lock-constant-face font-lock-type-face font-lock-function-name-face font-lock-variable-name-face font-lock-keyword-face font-lock-string-face font-lock-builtin-face font-lock-preprocessor-face font-lock-warning-face font-lock-doc-face font-lock-negation-char-face font-lock-regexp-grouping-construct font-lock-regexp-grouping-backslash)))
    (dolist (face faces)
      (face-remap-add-relative face '((:foreground "" :weight normal :slant normal)))))
  (face-remap-add-relative 'font-lock-keyword-face '((:weight bold)))
  (face-remap-add-relative 'font-lock-comment-face '((:slant italic)))
  (face-remap-add-relative 'font-lock-builtin-face '((:weight bold)))
  (face-remap-add-relative 'font-lock-preprocessor-face '((:weight bold)))
  (face-remap-add-relative 'font-lock-function-name-face '((:slant italic)))
  (face-remap-add-relative 'font-lock-string-face '((:slant italic)))
  (face-remap-add-relative 'font-lock-constant-face '((:weight bold))))
(add-hook 'color-identifiers-mode-hook 'myfunc-color-identifiers-mode-hook)

Other Keywords Dimmed


Emacs minor mode to highlight each source code identifier uniquely based on its name


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