Add some support for JavaScript

It adds new syntax groups for JavaScript and it relinks some existing
ones to have a better color scheme.

after/syntax/javascript.vim

@@ -0,0 +1,32 @@
+"               _                                         _         __
+"              (_)____ _ _   __ ____ _ _____ _____ _____ (_)____   / /_
+"             / // __ `/| | / // __ `// ___// ___// ___// // __ \ / __/
+"            / // /_/ / | |/ // /_/ /(__  )/ /__ / /   / // /_/ // /_
+"         __/ / \__,_/  |___/ \__,_//____/ \___//_/   /_// .___/ \__/
+"        /___/                        ____              /_/
+"                                    / __/____   _____
+"                                   / /_ / __ \ / ___/
+"                                  / __// /_/ // /
+"                             __  /_/   \____//_/
+"                 ____   ____/ /__  __ _____ _____ ___   __  __
+"                / __ \ / __  // / / // ___// ___// _ \ / / / /
+"               / /_/ // /_/ // /_/ /(__  )(__  )/  __// /_/ /
+"               \____/ \__,_/ \__, //____//____/ \___/ \__, /
+"                            /____/                   /____/
+"
+" Note: This script defines syntax groups that deal with function calls and
+" lambda definitions.
+"
+" Maintainer: Ludovic Koenig <ludovic.koenig@gmail.com>
+" Version: 0.7.0
+" Since: 0.7.0
+" License: MIT
+"
+" JavaScript Syntax {{{
+
+syntax keyword javaScriptOdysseyKeyword  of yield async await
+syntax match   javaScriptOdysseyFatArrow "=>"
+syntax match   javaScriptOdysseyFunction "\<\l\w*\>("me=e-1
+
+" }}}
+" vim: foldmethod=marker textwidth=79 colorcolumn=+1

colors/odyssey.vim

@@ -299,6 +299,16 @@ else
   let g:java_ignore_javadoc = 1
 endif
 
+" }}}
+" JavaScript Highlights {{{
+
+call s:l(       'javaScriptFunction', 'Statement')
+call s:l(         'javaScriptBraces',    'Normal')
+call s:l(     'javaScriptIdentifier', 'Statement')
+call s:l( 'javaScriptOdysseyKeyword',   'Keyword')
+call s:l('javaScriptOdysseyFunction',  'Function')
+call s:l('javaScriptOdysseyFatArrow', 'Statement')
+
 " }}}
 " Python Highlights {{{