[txmt-dev] Re: Working with indentation rules

[Allan Odgaard]

On 19 Sep 2013, at 0:06, Stephen Bannasch wrote:

> […] I wanted a similar indentation behavior when pressing return 
> after an open square brace followed by content as I get when I enter 
> return after an open curly brace followed by content.
> […] How do I find the code that produces the indentation after 
> entering return when my cursor is after an opening curly brace […]

By default, no bundle item is executed when you press return at random 
places. How much indent is inserted is estimated via the indent rules, 
this is explained here: 
http://manual.macromates.com/en/appendix#indentation_rules

So if you want only a change to indent, then it’s the indentation 
rules that should be changed.

If however you want more complex behavior, you can overload the key 
binding with a snippet or command.

For JavaScript, square brackets are assigned the 
“meta.brace.square.js” scope.

If we work with the grammar as-is, then we can make a snippet fire on 
return only when a square bracket is to the left of the caret by using a 
scope selector of:

     (L:meta.brace.square.js)

Here the scope selector targets the “left scope” via the (L:…) 
syntax, meaning the scope to the left of the caret. You can view the 
scope to the right of the caret by pressing ⌃⇧P (so move it one to 
the left to view the left scope).

But if your desire is simply to increase the indent, when pressing 
return after ‘[’, then it should be enough to edit the indent 
patterns (which already target squigly braces).