Added with/1 to the highlighted keywords

  - Added `with/1` to the keyword list
  - Added a test
  - Sorted the list of keywords alphabetically

Author: gausby

elixir-mode.el

@@ -142,9 +142,9 @@
                      (and "\"" (one-or-more (not (any "\""))) "\"")
                      (and "'" (one-or-more (not (any "'"))) "'"))))
       (builtin . ,(rx symbol-start
-                      (or "case" "cond" "for" "if" "unless" "try" "receive"
-                          "raise" "quote" "unquote" "unquote_splicing" "throw"
-                          "super" "send")
+                      (or "case" "cond" "for" "if" "quote" "raise" "receive" "send"
+                          "super" "throw" "try" "unless" "unquote" "unquote_splicing"
+                          "with")
                       symbol-end))
       (builtin-declaration . ,(rx symbol-start
                                   (or "def" "defp" "defmodule" "defprotocol"

test/elixir-mode-font-test.el

@@ -321,6 +321,21 @@ when"
 end"
    (should (eq (elixir-test-face-at 40) 'font-lock-keyword-face))))
 
+(ert-deftest elixir-mode-syntax-table/highlight-with ()
+  "Highlight with as a keyword"
+  :tags '(fontification syntax-table)
+  (elixir-test-with-temp-buffer
+   "defmodule Foo do
+  def bar(opts) do
+    with(
+      {:ok, width} <- Map.fetch(opts, :width),
+      {:ok, height} <- Map.fetch(opts, :height),
+      do: {:ok, width * height}
+    )
+  end
+end"
+   (should (eq (elixir-test-face-at 41) 'font-lock-keyword-face))))
+
 (ert-deftest elixir-mode-syntax-table/string-interpolation-in-words-list ()
   "https://github.com/elixir-lang/emacs-elixir/issues/263"
   :tags '(fontification syntax-table)