slim.lang, a language_spec for syntax highlighting in gedit

slim.lang

<?xml version="1.0" encoding="UTF-8"?>
<!--
 Author: Miguel San Miguel contact at miguelsanmiguel dotcom
 Based on 'haml.lang' by Ivan Kerin
-->
<language id="slim" _name="Slim" version="1.0" _section="Rails">
  <metadata>
    <property name="mimetypes">text/x-slim</property>
    <property name="globs">*.slim</property>
    <property name="line-comment-start">/ </property>
  </metadata>
  <styles>
    <style id="comment"                 _name="Comment"                 map-to="def:comment"/>
    <style id="directive"               _name="Directive"               map-to="def:shebang"/>
    <style id="tag"                     _name="Tag"                     map-to="def:keyword"/>
    <style id="class-tag"               _name="Class Tag"               map-to="def:function"/>
    <style id="id-tag"                  _name="Id Tag"                  map-to="def:identifier"/>
    <style id="string"                  _name="String"                  map-to="def:string"/>
    <style id="error"                   _name="Error"                   map-to="def:error"/>
  </styles>
  <definitions>
    <context id="line-comment" style-ref="comment">
      <match>^(  )*\/ .*$</match>
    </context>
    
    <context id="html-comment" style-ref="comment">
      <match>^(  )*\/! .*$</match>
    </context>
    
    <context id="directive" style-ref="directive">
      <match>^(  )*! .*$</match>
    </context>
    
    <context id="identation-error">
      <match>^( (  )*)[^\s].*$</match>
      <include>
        <context sub-pattern="1" style-ref="error"/>
      </include>
    </context>
    
    <context id="string" style-ref="string">
      <match>^(  )*\|.*$</match>
    </context>
    
    
    <context id="tags">
      <start>^(  )*</start>
      <end>$</end>
      
      <include>

        <context id="erb-block" end-parent="true">
          <start>=|-|~</start>
          <end>$</end>
          <include>
            <context ref="ruby:ruby:*"/>
          </include>
        </context>
        
        <context id="tag" style-ref="tag" once-only="true">
          <match>%[a-zA-Z0-9\-\_]+</match>
        </context>
        
        <context id="id-tag" style-ref="id-tag">
          <match>#[a-zA-Z0-9\-\_]+</match>
        </context>
        
        <context id="class-tag" style-ref="class-tag">
          <match>\.[a-zA-Z0-9\-\_]+</match>
        </context>
        
        <context id="unclosed-brecket" style-ref="error">
          <match>\}(?!{)</match>
        </context>
        
        <context id="erb-hash">
          <start>{</start>
          <end>}</end>
          <include>
            <context ref="ruby:ruby:*"/>
          </include>
        </context>
        
      </include>
    </context>
    
    
    <context id="slim">
      <include>
        <context ref="line-comment"/> 
        <context ref="html-comment"/> 
        <context ref="directive"/> 
        <context ref="identation-error"/> 
        <context ref="string"/> 
        <context ref="tags"/> 
      </include>
    </context>        
  </definitions>
</language>

I added this file to /usr/share/gtksourceview-2.0/language-specs/, selected slim highlighting in GEdit, but it didn't actually highlight for me. What else is required to get this to work?

got this to work. I just installed the gmate: https://github.com/gmate/gmate