[gtksourceview: 1/2] sh.lang: Fix function syntax highlighting

[Christian Hergert <chergert src gnome org>]

commit 6a9d996453ef0bd304fab36c23c684b0ac72daec
Author: Johannes Wolf <mail johannes-wolf com>
Date:   Fri Jan 31 21:56:58 2020 +0100

    sh.lang: Fix function syntax highlighting
    
    * Allow space inside parentheses
    * Make parentheses for declarations using the `function` keyword
      optional

 data/language-specs/sh.lang | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/data/language-specs/sh.lang b/data/language-specs/sh.lang
index d3c63002..88adc473 100644
--- a/data/language-specs/sh.lang
+++ b/data/language-specs/sh.lang
@@ -264,7 +264,17 @@
     </context>
 
     <context id="function" style-ref="function">
-      <match>\%{lb}\%{command-name}\s*\(\)</match>
+      <!-- Function declaration with or without function keyword.
+           For the later one, parentheses are mandatory -->
+      <match extended="true">
+        \%{lb}(?:
+          (function)\s+\%{command-name}\s*(\(\s*\))? |
+          \%{command-name}\s*\(\s*\)
+        )
+      </match>
+      <include>
+        <context sub-pattern="1" style-ref="keyword"/>
+      </include>
     </context>
 
     <context id="redirection" style-ref="others">
@@ -529,7 +539,6 @@
       <keyword>elif</keyword>
       <keyword>else</keyword>
       <keyword>fi</keyword>
-      <keyword>function</keyword>
       <keyword>if</keyword>
       <keyword>in</keyword>
       <keyword>select</keyword>