add simple promises-based wrapper to the slicer

app.js

@@ -366,6 +366,7 @@ const script = {
         "kiri/layers",
         "kiri/widget",
         "kiri/codec",
+        "kiri/engine"
     ].map(p => `src/${p}.js`),
     meta : [
         "ext/three",

src/kiri/engine.js

@@ -0,0 +1,128 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+"use strict";
+
+(function() {
+
+let KIRI = self.kiri = self.kiri || {};
+KIRI.newEngine = ()=> { return new Engine ()};
+
+class Engine {
+    constructor() {
+        this.widget = KIRI.newWidget();
+        this.settings = {
+            mode: "FDM",
+            controller: {},
+            filter: { FDM: "internal" },
+            device: KIRI.conf.defaults.fdm.d, // device profile
+            process: KIRI.conf.defaults.fdm.p, // slicing settings
+            widget: { [ this.widget.id ]: {} }
+        };
+        this.listener = () => {};
+    }
+
+    load(url) {
+        return new Promise((accept, reject) => {
+            try {
+                new moto.STL().load(url, vertices => {
+                    this.widget.loadVertices(vertices)
+                    accept(this);
+                });
+            } catch (error) {
+                reject(error);
+            }
+        });
+    }
+
+    parse(data) {
+        return new Promise((accept, reject) => {
+            try {
+                new moto.STL().parse(data, vertices => {
+                    this.widget.loadVertices(vertices)
+                    accept(this);
+                });
+            } catch (error) {
+                reject(error);
+            }
+        });
+    }
+
+    setListener(listener) {
+        this.listener = listener;
+    }
+
+    setMode(mode) {
+        this.settings.mode = mode;
+        return this;
+    }
+
+    setDevice(device) {
+        Object.assign(this.settings.device, device);
+        return this;
+    }
+
+    setProcess(process) {
+        Object.assign(this.settings.process, process);
+        return this;
+    }
+
+    moveTo(x, y, z) {
+        this.widget.move(x, y, z, true);
+        return this;
+    }
+
+    move(x, y, z) {
+        this.widget.move(x, y, z);
+        return this;
+    }
+
+    scale(x, y, z) {
+        this.widget.scale(x, y, z);
+        return this;
+    }
+
+    rotate(x, y, z) {
+        this.widget.rotate(x, y, z);
+        return this;
+    }
+
+    slice() {
+        return new Promise((accept, reject) => {
+            KIRI.client.slice(this.settings, this.widget, msg => {
+                this.listener({slice:msg});
+                if (msg.error) {
+                    reject(msg.error);
+                }
+                if (msg.done) {
+                    accept(this);
+                }
+            });
+        });
+    }
+
+    prepare() {
+        return new Promise((accept, reject) => {
+            KIRI.client.prepare(this.settings, update => {
+                this.listener({prepare:{update}});
+            }, done => {
+                this.listener({prepare:{done:true}});
+                accept(this);
+            });
+        });
+    }
+
+    export() {
+        return new Promise((accept, reject) => {
+            let output = [];
+            KIRI.client.export(this.settings, segment => {
+                this.listener({export:{segment}});
+                output.push(segment);
+            }, done => {
+                this.listener({export:{done}});
+                accept(output.join('\r\n'));
+            });
+        });
+    }
+}
+
+})();