Sick of seeing numbers like 123456789?

Want to see numbers like 123,456,789?

Use this.

This package uses the ‘display text property and font-lock to show the number separations. The underlying text remains unchanged.

(require 'number-separator)
(number-separator-mode)

or

(use-package number-separator
  :custom
  (number-separator ",")
  (number-separator-interval 3)
  (number-separator-ignore-threshold 4)
  (number-separator-decimal-char ".")
  :config
  (number-separator-mode))

Or if you are European:

(use-package number-separator
  :custom
  (number-separator ".")
  (number-separator-interval 3)
  (number-separator-ignore-threshold 4)
  (number-separator-decimal-char ",")
  :config
  (number-separator-mode))

You can customize the following variables:

number-separator

character used to separate groups of integer numbers. Default: “,”

number-separator-interval

how many numbers in each group? Default: 3.

number-separator-decimal-char

how do you separate integers from fractionals. Default “.”

number-separator-ignore-threshold

don’t begin separating numbers until they have more than this many digits. Default 4 (i.e., to avoid separating four digit years)