[TxMt] Re: Tree structure bundle?

[Rob Shearer]

> Michael Gregoire <mgee at ...> writes:
>> Hi everyone... I catalog my external media using the 'tree' command
>> and this generates a file such as the one attached.
>> Does anyone know of a bundle developed to allow folding for this?
>>
>> .
>> |-- a
>> |   |-- AC_DC
>> |   |   |-- AC_DC - Highway to Hell.mp3
>> |   |   `-- AC_DC - You Shook Me All Night Long.mp3
>> |   |-- Alan Parsons Project - Games People Play.mp3
>> |   |-- Alt & The Lost Civilisation - Tequila.mp3
>> |   `-- Archies - Sugar Sugar.mp3
>
> Hmm, I don't think this is possible given the current folding  
> architecture.
> Hopefully it will be possible with the new parser features being  
> added for 2.0.

To figure out whether a line should actually start a folding you  
really need to be able to look ahead to the next line, and I think  
you can't do that in TM. (yet?)

But if your actual data is a bunch of directories of MP3 files, a  
simple little language which sets

	foldingStartMarker = '^(\|   )*\|-- .*(?<!.mp3)$';
	foldingStopMarker = '^(\|   )*`--';

does more or less the right thing. The "negative lookbehind" is the  
hacky heuristic to decide whether a line starts a folding or not: it  
will break if there are empty directories, if any file name doesn't  
end with .mp3, or if any directory name does. Giving the -F flag to  
`tree` will disambiguate the naming things (use "/$" instead of "(? 
<!.mp3)$", but won't fix the problem with empty directories.

One of the things I really like about TextMate is that such  
customizations are quick enough to be economic even for grotty single- 
use "languages" like this one.

-rob