Description

This is not intended to be final, but I had some time so I thought I would work on this. First pass ended up being easier than I was expecting.

• Implements[FEATURE] Let-in syntax in simplexpr #408
• Allows the usage oftrue andfalsewithin idents, so long as it is not the entire thing.

Usage

(defvar somevar {{ "key": "Some Value" }})(label  :text { let it = somevar.value in "Here Is ${it}" end })

Showcase

My current workspace indicator:

Where I have a script that outputs the following on workspace changes:

{"1": {"dis":-1,"ex":false,"urg":false  },...}

And the let-in syntax to pull out the relevant information for each part

(defwidget workspaceIndicator [num monitor]  (box :orientation"v"    (button      :class {let          ws= active_workspaces["${num}"],          foc= ws.dis== monitor ?" focused" :"",          vis= ws.dis>=0 ?" visible" :"",          ex= ws.ex ?" exists" :""in"indicator"+ foc+ vis+ ex        end      }      :onclick"scripts/workspaces set ${num}"      (box :orientation"v"        (box :orientation"h"          (box :class "inner"))))))

Diffs containing fuller example of usage

Additional Notes

I borrowed the testing macro from#577

Checklist

Please make sure you can check all the boxes that apply to this PR.

• All widgets I've added are correctly documented.
• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in thedocs/content/main directory has been adjusted to reflect my changes.
• I usedcargo fmt to automatically format all code before committing