add range() function in gcode macro expressions

src/kiri/print.js

@@ -1278,7 +1278,8 @@
             for (let [k,v] of Object.entries(consts)) {
                 eva.push(`let ${k} = "${v}";`);
             }
-            eva.push(`try {( ${tok} )} catch (e) {0}`);
+            eva.push(`function range(a,b) { return (a + (layer / layers) * (b-a)).round(3) }`)
+            eva.push(`try {( ${tok} )} catch (e) {console.log(e);0}`);
             let scr = eva.join('');
             let evl = eval(`{ ${scr} }`);
             nutok = evl;

src/mode/fdm/export.js

@@ -92,6 +92,7 @@
                 bottom: offset ? 0 : -device.bedDepth/2,
                 z_max: device.maxHeight,
                 layers: layers.length,
+                progress: 0,
                 nozzle: 0,
                 tool: 0
             },