I tend to write a good amount of documentation so the MediaWiki format to me is easy for me to understand plus it saves me a lot of time than having to write traditional HTML.
The best would be to use MediaWiki parser. The good news is that MediaWiki 1.19 will provide a command line tool just for that!
Disclaimer: I wrote that tool.
The script is maintenance/parse.php
some usage examples straight from the source code:
Entering text yourself, ending it with Control + D:
$ php maintenance/parse.php --title foo
''[[foo]]''^D
foo
$
The usual file input method:
$ echo "'''bold'''" > /tmp/foo.txt
$ php maintenance/parse.php /tmp/foo.txt
bold
$
And of course piping to stdin:
$ cat /tmp/foo | php maintenance/parse.php
bold
$
as of today you can get the script from http://svn.wikimedia.org/svnroot/mediawiki/trunk/phase3/maintenance/parse.php and place it in your maintenance directory. It should work with MediaWiki 1.18
The script will be made available with MediaWiki 1.19.0.