Duration Calculator — Add and subtract durations of time

[Tyler Eich]

This workflow extends Alfred's built-in calculator function. It recognizes durations as input and allows them to be added / subtracted. For example, if you type "8:00:18 - 4:19:23" into Alfred, you'll get "3:40:55".

 

You may add or subtract as many durations as you like (e.g. "3:32:55 - 5:57 + 4:50:14").

 

Download

 

Preview:

[dfay]

I'd love to see the source of this.  The workflow just has an executable.  Am curious as to how you extended the built-in calculator.

[Tyler Eich]

I'd love to see the source of this.  The workflow just has an executable.  Am curious as to how you extended the built-in calculator.

 

I'll probably post the source code on GitHub at some point. Here's a quick look in the meantime: http://cl.ly/code/3a402k0D1s2v

 

By the way, I'm not actually extending the codebase for Alfred's calculator. The workflow feels like an extension of the calculator because it is triggered by the same characters that trigger the normal calculator (i.e. 0-9 and +-). These keywords act as a bridge to the binary, which returns results very similar to Alfred's normal calculator. It's also very fast, mainly because it's written in C.

[unnamed777]

I found some issues with calculator. For instance, "01:10+00:10+00:10" returns "01:21:00" instead of "1:30:00". Even example from the main screenshot has an error (result should be "7:40:38"). I used source code from post above and has fixed issues. The fixed code and updated binary are available on github.

[Nils]

For your latest code. I had to change from const char sep = ':'; to const char sep[2] = ":"; to get it to work. Compiled, ran, happy. Test for me was: "03:50+ 10:40" which di not result in 14:30, but in something with a 5 in the end - 13:45 I think it was. The first value did not get parsed to 3h 50min, but to 3h 5min. The latter worked!?