[txmt-dev] Re: Setting the background color of a specific line

[Allan Odgaard]

On 1 Apr 2014, at 21:53, Gerd Knops wrote:

> I think a better approach for that would be if you could inject scopes 
> into the document (like set error scope on line 54, char 12). Then you 
> can use styles as usual to highlight the errors. Obviously it would 
> also be necessary to be able to attach metadata to those warning/error 
> scopes […]

My thoughts on such feature is to place warning and error images in the 
gutter and allow mate as the interface:

     "$TM_MATE" --line 32:3 --error "unexpected identifier" 
/path/to/file

This should also make it feel natural to use F2/⇧F2 for next/previous 
error/warning, as they would effectively be bookmarks with another icon 
and possibly tool tip or some other way to render the additional text.

As TextMate::Executor.run’s default error matching code is used by 
several bundles, it should be simple to have it call "$TM_MATE" and 
thereby add this feature to several existing build/run commands.

There is partial support for the above already, see 
https://github.com/textmate/textmate/blob/master/Frameworks/document/src/document.h#L88 
— though extending ‘mate’ to allow setting marks is missing, so 
are icons for other than “search” and “bookmark”, see 
https://github.com/textmate/textmate/blob/master/Frameworks/OakTextView/src/OakDocumentView.mm#L698

As for the original question “I'm having trouble to get out the line_t 
which matches a given line number. How can I do that?
”. You’re not really supposed to work with line_t objects outside of 
the layout framework. You can query the layout to get coordinates for 
buffer offsets, but if you want to change rendering, then it should 
probably be added directly to layout_t (with an API that is then used by 
OakTextView).