Batch resize selected text's line spacing based on font size?

[fsob236084742od6]

Hello everyone! Like title, I need a script/action or a shortcut which could increase one pt of line spacing compared to font size like this: 

Could it be possible? Thank you in advance!

[c.pfaffenbichler]

Scripting Type Layers in Photoshop is often bothersome, so would it really be worth the trouble? 

Are the Type Layers uniform or do they combine different fonts, sizes, tracking, …? 

How well versed are you with JavaScript and Photoshop AM-code?