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Flycheck has a symbol that tells in which line an error or warning have been encountered. I have seen spacemacs has its flycheck symbol changed. Default symbol is a double arrow; while spacemacs's symbol is a dot. I can't find a function to change it. How did spacemacs do that?

Spacemacs flycheck symbol looks like this (red dot)

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After reading flycheck source code..

  1. You must define a fringe bitmap (the "symbol") with 'define-fringe-bitmap' function.

  2. Use 'flycheck-define-error-level' function to load the new bitman

  3. Enable Flycheck mode

Example:

(define-fringe-bitmap 'flycheck-fringe-bitmap-ball
    (vector #b00000000
            #b00000000
            #b00000000
            #b00000000
            #b00000000
            #b00111000
            #b01111100
            #b11111110
            #b11111110
            #b01111100
            #b00111000
            #b00000000
            #b00000000
            #b00000000
            #b00000000
            #b00000000
            #b00000000))

(flycheck-define-error-level 'error
  :severity 100
  :compilation-level 2
  :overlay-category 'flycheck-error-overlay
  :fringe-bitmap 'flycheck-fringe-bitmap-ball
  :fringe-face 'flycheck-fringe-error
  :error-list-face 'flycheck-error-list-error)

Edit: removed extra ')'

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  • It worked, thanks. For those interested, for warnings and info just replace all "error" words with "warning" and "info" of flycheck-define-error-level. – Michael Oct 23 '17 at 22:26
  • Also, I used 2, 1 and 0 for severity of errors, warnings and info respectively. – Michael Oct 23 '17 at 22:36

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