Add piskel-cli for exporting from .piskel files via command line

cli/export-png.js

@@ -0,0 +1,130 @@
+const fs = require('fs');
+
+function onPageEvaluate(window, options, piskel) {
+    console.log("\nPiskel name: " + piskel.descriptor.name);
+
+    // Setup piskelController
+    var piskelController = new pskl.controller.piskel.PiskelController(piskel);
+
+    pskl.app.piskelController = piskelController;
+
+    piskelController.init();
+
+    // Apply crop if enabled
+    if (options.crop) {
+        // Mock selection manager to avoid errors during crop
+        pskl.app.selectionManager = {};
+
+        // Setup crop tool
+        var crop = new pskl.tools.transform.Crop();
+
+        // Perform crop
+        crop.applyTransformation();
+
+        // Get cropped piskel
+        piskel = piskelController.getPiskel();
+    }
+
+    // Mock exportController to provide zoom value based on cli args
+    // and to avoid errors and/or unnecessary bootstrapping
+    var exportController = {
+        getExportZoom: function () {
+            var zoom = options.zoom;
+
+            if (options.scaledWidth) {
+                zoom = options.scaledWidth / piskel.getWidth();
+            } else if (options.scaledHeight) {
+                zoom = options.scaledHeight / piskel.getHeight();
+            }
+
+            return zoom;
+        }
+    };
+
+    // Setup pngExportController
+    var pngExportController = new pskl.controller.settings.exportimage.PngExportController(piskelController, exportController);
+
+    // Mock getColumns and getRows to use values from cli arguments
+    pngExportController.getColumns_ = function () {
+        if (options.columns) return options.columns;
+
+        if (options.rows) {
+            return Math.ceil(piskelController.getFrameCount() / pngExportController.getRows_());
+        } else {
+            return pngExportController.getBestFit_();
+        }
+    };
+
+    pngExportController.getRows_ = function () {
+        if (options.columns && !options.rows) {
+            return Math.ceil(piskelController.getFrameCount() / pngExportController.getColumns_());
+        }
+
+        return options.rows;
+    };
+
+    // Render to output canvas
+    var canvas;
+
+    if (options.frame > -1) {
+        // Render a single frame
+        canvas = piskelController.renderFrameAt(options.frame, true);
+
+        var zoom = exportController.getExportZoom();
+
+        if (zoom != 1) {
+            // Scale rendered frame
+            canvas = pskl.utils.ImageResizer.resize(canvas, canvas.width * zoom, canvas.height * zoom, false);
+        }
+    } else {
+        // Render the sprite sheet
+        canvas = pngExportController.createPngSpritesheet_();
+    }
+
+    // Add output canvas to DOM
+    window.document.body.appendChild(canvas);
+
+    // Prepare return data
+    const returnData = {
+        width: canvas.width,
+        height: canvas.height
+    };
+
+    // Wait a tick for things to wrap up
+    setTimeout(function ()  {
+        // Exit and pass data to parent process
+        window.callPhantom(returnData);
+    }, 0);
+}
+
+function onPageExit(page, options, data) {
+    // Set clip for output image
+    if (data.width && data.height) {
+        page.clipRect = { top: 0, left: 0, width: data.width, height: data.height };
+    }
+
+    console.log("\n" + 'Generated file(s):');
+
+    const dest = options.dest + '.png';
+
+    // Render page to the output image
+    page.render(dest);
+
+    console.log(" " + dest);
+
+    if (options.dataUri) {
+        const dataUriPath = options.dest + '.datauri';
+
+        const dataUri = `data:image/png;base64,${page.renderBase64('PNG')}`;
+
+        // Write data-uri to file
+        fs.write(dataUriPath, dataUri, 'w');
+
+        console.log(" " + dataUriPath);
+    }
+}
+
+module.exports = {
+    onPageEvaluate: onPageEvaluate,
+    onPageExit: onPageExit
+};