roslaunch syntax highlight for qt creator

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The solution that worked for me was:

1. Find out, where your Syntax Highlight Definition Files are located by navigating to: Tools->Options->Text Editor->Generic Highlighter and note the given paths.
2. Find the syntax file for xml: xml.xml in one of the paths noted above.
3. You can either edit this file directly or make a copy and name it launch.xml (You might need sudo to do this). Then edit the line that starts with <language name="XML" by adding *.launch to the extensions="... argument. Mine looks like this now:

<language name="XML" version="2.03" kateversion="2.4" section="Markup" extensions="*.launch;*.docbook;*.xml;*.rc;*.daml;*.rdf;*.rss;*.xspf;*.xsd;*.svg;*.ui;*.kcfg;*.qrc;*.wsdl" mimetype="text/xml;text/book;text/daml;text/rdf;application/rss+xml;application/xspf+xml;image/svg+xml;application/x-designer;application/xml" casesensitive="1" author="Wilbert Berendsen (wilbert@kde.nl)" license="LGPL">

The way to get syntax highlighting is actually pretty simple. Open QtCreator and go to Tools->Options->Generic Highlighter. Then navigate to whatever directory is listed. Lastly,

cp xml.xml launch.xml

You may need to sudo that command, depending on where it is installed. After that, you should be good.