feat: Enough commands to get to the @ (#29)

Reviewed-on: #29
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>

src/adapptlet.civet

@@ -57,7 +57,7 @@ function dispatchJcommand(api: AppletObject, param: Element): void
                console.log `Geogebra command '${command}' translated from`,
                   val, 'failed.'
          else
-            console.log `Unknown command '${val}'`
+            console.log `Could not parse command '${val}'`
       else
          console.log `Unkown param ${param}`
 
@@ -72,22 +72,44 @@ classHandler: Record<string, ClassHandler> :=
    point: (name, method, data, colors) =>
       command .= ''
       callbacks: GeogebraCallback[] .= []
+      args := data.split(',')
       switch method
          /free|fixed/
             command += `${name} = (${data})`
             if method is 'fixed'
                callbacks.push (api: AppletObject) => api.setFixed(name, true)
          'perpendicular'
-            [center, direction] := data.split(',')
+            [center, direction] := args
             command += `${name} = Rotate(${direction}, 3*pi/2, ${center})`
+         'angleDivider'
+            n .= -1
+            // use the fact that NaN doesn't equal itself:
+            nLoc := args.findIndex((arg) => (n = parseInt arg) is n)
+            if n >= 0
+               args.splice(nLoc)
+               [center, start, end] := args
+               command += `${name}aUx1 = Segment(${start}, ${end})
+                  ${name}aUx2 = Angle(${start}, ${center}, ${end})
+                  ${name}aUx2a = If(${name}aUx2 > pi, ${name}aUx2 - 2*pi, ${name}aUx2)
+                  ${name}aUx3 = Rotate(${start}, ${name}aUx2a/${n}, ${center})
+                  ${name}aUx4 = Ray(${center}, ${name}aUx3)
+                  ${name} = Intersect(${name}aUx1, ${name}aUx4)`
+         'intersection'
+            command += `${name} = Intersect(${data})`
       return {command, callbacks}
 
    line: (name, method, data, colors) =>
       command .= ''
       callbacks: GeogebraCallback[] .= []
+      args := data.split(',')
       switch method
          'connect'
             command += `${name} = Segment(${data})`
+         'parallel'
+            [newStart, oldStart, oldEnd] := args
+            command += `${name}aUx1 = Vector(${oldStart}, ${newStart})
+               ${name}aUx2 = Translate(${oldEnd}, ${name}aUx1)
+               ${name} = Segment(${newStart}, ${name}aUx2)`
       return {command, callbacks}
 
    circle: (name, method, data, colors) =>