Monday, March 9, 2009

bespin extensibility / auto-indenting

bespin allows you to extend itself with JavaScript. Obviously this JavaScript is edited with bespin itself (I love StrangeLoops(TM)).
The easiest way to do this is to edit the config.js file within the standard BespinSettings project. Here is a sample that enables indenting after line breaks. When you hit enter the next line will have the same leading white space as the current line and when you hit enter after an opening { it will add an extra two spaces (Note that because this is my personal config.js I don't have to worry about configurable tab width :)
bespin.publish("bespin:editor:bindkey", {
key: "ENTER",
action: function (args) {
console.log("Pressed enter")
var editor = bespin.get("editor");
var line = editor.model.getRowArray(args.modelPos.row).join("");
var match = line.match(/^(\s*)/)
var leadingWs = match[1];
var chunk = leadingWs;
var newBlock = line.match(/{\s*$/) ? true : false;

if(newBlock) chunk += " "

args.chunk = chunk;
Note1: More Info on the bespin custom events
Note2: For this to work you may need to enable the setting 'autoconfig': 'on' first
Note3: Seems like there currently is no easy way to say "In this case ignore me" for an event key event handler which would make it easy to do the right thing in case of an active selection.
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