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Gray out ignored variables #296

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Merged
merged 1 commit into from
Nov 26, 2015
Merged

Gray out ignored variables #296

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18 changes: 18 additions & 0 deletions elixir-mode.el
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,16 @@
"For use with atoms & map keys."
:group 'font-lock-faces)

(defvar elixir-ignored-var-face 'elixir-ignored-var-face)
(defface elixir-ignored-var-face
'((((class color) (min-colors 88) (background light))
:foreground "#424242")
(((class color) (background dark))
(:foreground "#616161"))
(t nil))
"For use with ignored variables (starting with underscore)."
:group 'font-lock-faces)

(eval-when-compile
(defconst elixir-rx-constituents
`(
Expand Down Expand Up @@ -405,6 +415,14 @@ is used to limit the scan."
(one-or-more "\n")))
1 font-lock-variable-name-face)

;; Gray out variables starting with "_"
(,(elixir-rx symbol-start
(group (and "_"
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I thought about extracting the contents of this group to a variable like it is done with sigils and identifiers, but I couldn't find a descriptive name, so I've left the definition inlined.

What do you guys think?

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I think it's fine to leave for now.

(any "A-Z" "a-z" "0-9"))
(zero-or-more (any "A-Z" "a-z" "0-9" "_"))
(optional (or "?" "!"))))
1 elixir-ignored-var-face)

;; Map keys
(,(elixir-rx (group (and (one-or-more identifiers) ":")))
1 elixir-atom-face)
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27 changes: 27 additions & 0 deletions test/elixir-mode-font-test.el
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Expand Up @@ -426,6 +426,33 @@ end
"
(should (eq (elixir-test-face-at 33) 'font-lock-string-face))))

(ert-deftest elixir-mode-syntax-table/gray-out-ignored-var ()
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I have little experience writing these kind of tests.

Is this acceptable ?

"https://github.com/elixir-lang/emacs-elixir/issues/292"
:tags '(fontification syntax-table)
(elixir-test-with-temp-buffer
"variable
_var
_x
_x!
_x?
_
__MODULE__
"
(should (eq (elixir-test-face-at 4) nil))
(should (eq (elixir-test-face-at 14) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 15) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 23) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 24) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 30) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 32) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 38) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 40) 'elixir-ignored-var-face))
(should (eq (elixir-test-face-at 46) 'font-lock-constant-face))
(should (eq (elixir-test-face-at 46) 'font-lock-constant-face))
(should (eq (elixir-test-face-at 52) 'font-lock-constant-face))
(should (eq (elixir-test-face-at 53) 'font-lock-constant-face))
(should (eq (elixir-test-face-at 55) 'font-lock-constant-face))))

(provide 'elixir-mode-font-test)

;;; elixir-mode-font-test.el ends here