Add support for long options in syntax (#192)

* Add support for long options in syntax

Tweak the regex which matches command options to correctly detect GNU-style long options.

* Add support for '+' options

These options are used in programs like ImageMagick.

Author: matteocoder

PowerShell.sublime-syntax

@@ -186,7 +186,7 @@ contexts:
       captures:
         1: punctuation.definition.keyword.powershell
     # Flags/Options/Parameters
-    - match: \B([-/])\p{L}(?:[\w-]*\w)?
+    - match: \B(--?|[/+])\p{L}(?:[\w-]*\w)?
       scope: variable.parameter.option.powershell
       captures:
         1: punctuation.definition.parameter.powershell

Tests/syntax_test_PowerShell.ps1

@@ -92,6 +92,17 @@ throw "Do not run this file!"
 #                                     ^^^ keyword.control
 #                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ string.unquoted - constant - variable - comment
 
+& gnutool.exe -s 'short option' --long-option --very_long_option value +plus-option
+#<- keyword.operator.other
+# ^^^^^^^^^^^ variable.function
+#             ^ variable.parameter.option punctuation.definition.parameter
+#              ^ variable.parameter.option
+#                               ^^ variable.parameter.option punctuation.definition.parameter
+#                                             ^^ variable.parameter.option punctuation.definition.parameter
+#                                               ^^^^^^^^^^^^^^^^ variable.parameter.option
+#                                                                      ^ variable.parameter.option punctuation.definition.parameter
+#                                                                       ^^^^^^^^^^^ variable.parameter.option 
+
 # Automatic variables
 $_, $$, $^, $?
 # <- punctuation.definition.variable