Re: Small improvements to ruby-mode

[Dmitry Gutov <dgutov@yandex.ru>]

On 02.07.2013 22:38, Dmitry Gutov wrote:
> Putting the cursor on one of the 4 lines after "elsif" in the second
> example and pressing `C-M-p' moves it to the "add_offence" line.
>
> And pressing `C-M-n' after that moves it to the "end" closing the
> "operands.each" block.
>
> Pressing `C-M-p' or `C-M-n' on the `elsif' line misbehaves similarly.

I've fixed the last one and left the other two in. For the most part, 
they're intentional, since we're not supposed to stop at "elsif" (it's 
not beginning or end of a block, after all).

As far as the keywords go, I've checked in the following patch:

=== modified file 'lisp/ChangeLog'
--- lisp/ChangeLog	2013-07-03 03:20:04 +0000
+++ lisp/ChangeLog	2013-07-03 15:45:17 +0000
@@ -1,3 +1,8 @@
+2013-07-03  Dmitry Gutov  <dgutov@yandex.ru>
+
+	* progmodes/ruby-mode.el (ruby-font-lock-keywords): Highlight more
+	keywords and built-ins.
+
  2013-07-03  Glenn Morris  <rgm@gnu.org>

  	* subr.el (y-or-n-p): Handle empty prompts.  (Bug#14770)

=== modified file 'lisp/progmodes/ruby-mode.el'
--- lisp/progmodes/ruby-mode.el	2013-07-03 01:02:18 +0000
+++ lisp/progmodes/ruby-mode.el	2013-07-03 15:36:27 +0000
@@ -1762,31 +1762,67 @@
               "yield")
             'symbols)
            "\\|"
-          ;; keyword-like methods on Kernel and Module
            (regexp-opt
-           '("alias_method"
+           ;; built-in methods on Kernel
+           '("__callee__"
+             "__dir__"
+             "__method__"
+             "abort"
+             "at_exit"
+             "autoload"
+             "autoload?"
+             "binding"
+             "block_given?"
+             "caller"
+             "catch"
+             "eval"
+             "exec"
+             "exit"
+             "exit!"
+             "fail"
+             "fork"
+             "format"
+             "lambda"
+             "load"
+             "loop"
+             "open"
+             "p"
+             "print"
+             "printf"
+             "proc"
+             "putc"
+             "puts"
+             "raise"
+             "rand"
+             "readline"
+             "readlines"
+             "require"
+             "require_relative"
+             "sleep"
+             "spawn"
+             "sprintf"
+             "srand"
+             "syscall"
+             "system"
+             "throw"
+             "trap"
+             "warn"
+             ;; keyword-like private methods on Module
+             "alias_method"
               "autoload"
               "attr"
               "attr_accessor"
               "attr_reader"
               "attr_writer"
-             "catch"
               "define_method"
               "extend"
-             "fail"
               "include"
-             "lambda"
-             "loop"
               "module_function"
+             "prepend"
               "private"
-             "proc"
               "protected"
               "public"
-             "raise"
               "refine"
-             "require"
-             "require_relative"
-             "throw"
               "using")
             'symbols)
            "\\)")
@@ -1794,12 +1830,16 @@
           '(if (match-beginning 4)
                font-lock-builtin-face
              font-lock-keyword-face))
+   ;; Perl-ish keywords
+   "\\_<\\(?:BEGIN\\|END\\)\\_>\\|^__END__$"
     ;; here-doc beginnings
     `(,ruby-here-doc-beg-re 0 (unless (ruby-singleton-class-p 
(match-beginning 0))
                                 'font-lock-string-face))
     ;; variables
     '("\\(^\\|[^.@$]\\|\\.\\.\\)\\_<\\(nil\\|self\\|true\\|false\\)\\>"
       2 font-lock-variable-name-face)
+   ;; keywords that evaluate to certain values
+   '("\\_<__\\(?:LINE\\|ENCODING\\|FILE\\)__\\_>" 0 
font-lock-variable-name-face)
     ;; symbols
 
'("\\(^\\|[^:]\\)\\(:\\([-+~]@?\\|[/%&|^`]\\|\\*\\*?\\|<\\(<\\|=>?\\)?\\|>[>=]?\\|===?\\|=~\\|![~=]?\\|\\[\\]=?\\|@?\\(\\w\\|_\\)+\\([!?=]\\|\\b_*\\)\\|#{[^}\n\\\\]*\\(\\\\.[^}\n\\\\]*\\)*}\\)\\)"
       2 font-lock-constant-face)