I noticed that WordPress these days uses a shortcode to define image captions, of the form:
[caption id="" align="aligncenter" width="630" caption="Image title goes here"]<img src="http://domain.com/imgpath/../image.jpg" width="630" height="420" />[/caption]
I’ve recently redone our blog template at Technomadics, and while setting up the new preview template in MarsEdit, thought I’d take a stab at implementing support for captions, too, via some javascript in the template.
I was successful! Here’s how I did it:
Added the following to the “head” section:
<script type="text/javascript">
var prior_content;
function watch_for_changes() {
var check = function() {
var elt = document.getElementById('content');
if ( elt.innerHTML != prior_content ) {
elt.innerHTML = apply_filters(elt.innerHTML);
prior_content = elt.innerHTML;
}
setTimeout(check, 100);
};
setTimeout(check, 100);
}
function apply_shortcode(source, name, callback) {
return source.replace(new RegExp('\\[' + name + '\\s*([^\\]]*)\\]((.|[\s\n])*?)\\[/' + name + '\\]', 'g'),
function(match, paramString, content) {
params = new Object();
reg = /([a-z]+)="((:?="[^"]+"|[^"])*)"/gi;
while ( (match = reg.exec(paramString)) != null ) {
params[match[1]] = match[2];
}
return callback(params, content);
});
}
function apply_filters(html) {
html = apply_shortcode(html, "caption", function(args, content) {
return '<div '+
'class="wp-caption ' + (typeof(args.align) != 'undefined' ? args.align : '') + '" '+
'style="width: ' + args.width + 'px;">' + content +
'<p class="wp-caption-text">' + args.caption + '</p></div>';
});
return html;
}
</script> |
…changed to ‘body’ tag to…
<body onload="watch_for_changes();"> |
…And wrapped a div around the main “#body#, #extended#” content with an id of content:
<div id="content">
#body#
#extended#
</div> |
Basically, it polls the content area for changes, and when triggered, runs it though a filter. The above is extensible, and by adding additional “apply_shortcode” calls from “apply_filters“, more shortcodes can be simulated.
I’m a really big fan of 
Here’s a cute little Alfred extension I put together today that uploads a file to a TestFlight team for you, after prompting for build notes.
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Searching iOS header files with Xcode
I’m often having to grep through various iOS frameworks in search of error codes that appear (“What the bloody hell does -10867 mean?”). This can be a bit annoying – especially while working with Core Audio – so I put together an Alfred workflow that does it for me.
Here it is – type “hs” (short for “header search”) then the text you want to search for, and it’ll give you matching results. Hit enter to open that file:line combination in Sublime Text, or edit the action script to work with the editor of your choice.
Search Xcode Header Files.alfredworkflow