[brudgers]

Alan Kay talks about a text justification bug in MicroSoft Word that's been around for 30 years. [1] PhotoShop is many many millions of lines of code, making an API that covers all of it is unlikely, and at best it is practical to make some subset of its procedures available from a command line.

In contrast, an AutoCad drawing is serializable to a text file of AutoCad commands.

At the core of the software architecture, it's analogous to REST versus SOAP soaked in kerosene with three decades of software evolution piled on top. Nobody loves AutoCad's DXF with deep abiding passion, but nobody would take "DXF is not my favorite file format" [2] rants in the source code seriously.

The point from AutoCad's <Point:> command is the same point that everything else is built on. It's bottom up. So in the end, a full blown command language for Photoshop would need a <Pixel:> command. And everything else, all the way up, would need to rely on calls to <:Pixel>. That's the level of granularity required to implement a command API like AutoCad's.

That's the joy of AutoCad's command line. It's programming with a REPL. Photoshop doesn't have one at its core.

[1]: https://www.youtube.com/watch?v=ubaX1Smg6pY&=

[2]: https://code.google.com/p/xee/source/browse/XeePhotoshopLoad...