Add CLI button

src/client/lazy-app/Compress/Options/index.tsx

@@ -18,6 +18,8 @@ import Select from './Select';
 import { Options as QuantOptionsComponent } from 'features/processors/quantize/client';
 import { Options as ResizeOptionsComponent } from 'features/processors/resize/client';
 
+import { generateCliInvocation } from '../../util/cli-invocation-generator';
+
 interface Props {
   mobileView: boolean;
   source?: SourceImage;
@@ -97,6 +99,23 @@ export default class Options extends Component<Props, State> {
     );
   };
 
+  private onCreateCLIInvocation = () => {
+    if (!this.props.encoderState) {
+      return;
+    }
+
+    try {
+      const cliInvocation = generateCliInvocation(
+        this.props.encoderState,
+        this.props.processorState,
+      );
+      navigator.clipboard.writeText(cliInvocation);
+    } catch (e) {
+      // Show toast
+      console.error(e);
+    }
+  };
+
   render(
     { source, encoderState, processorState, onEncoderOptionsChange }: Props,
     { supportedEncoderMap }: State,
@@ -110,7 +129,9 @@ export default class Options extends Component<Props, State> {
         <Expander>
           {!encoderState ? null : (
             <div>
-              <h3 class={style.optionsTitle}>Edit</h3>
+              <h3 class={style.optionsTitle}>
+                <button onClick={this.onCreateCLIInvocation}>CLI</button>Edit
+              </h3>
               <label class={style.sectionEnabler}>
                 <Checkbox
                   name="resize.enable"

src/client/lazy-app/util/cli-invocation-generator.ts

@@ -0,0 +1,51 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { EncoderState, ProcessorState } from '../feature-meta';
+
+// Maps our encoder.type values to CLI parameter names
+const typeMap = new Map<string, string>([
+  ['avif', '--avif'],
+  // ["jxl", "--jxl"],
+  ['mozJPEG', '--mozjpeg'],
+  ['oxiPNG', '--oxipng'],
+  ['webP', '--webp'],
+  // ["wp2", "--wp2"]
+]);
+
+// Same as JSON.stringify, but with single quotes around the entire value
+// so that shells don’t do weird stuff.
+function cliJson<T>(v: T): string {
+  return "'" + JSON.stringify(v) + "'";
+}
+
+export function generateCliInvocation(
+  encoder: EncoderState,
+  processor: ProcessorState,
+): string {
+  if (!typeMap.has(encoder.type)) {
+    throw Error(`Encoder ${encoder.type} is unsupported in the CLI`);
+  }
+  return [
+    'npx',
+    '@squoosh/cli',
+    ...(processor.resize.enabled
+      ? ['--resize', cliJson(processor.resize)]
+      : []),
+    ...(processor.quantize.enabled
+      ? ['--quant', cliJson(processor.quantize)]
+      : []),
+    typeMap.get(encoder.type)!,
+    cliJson(encoder.options),
+  ].join(' ');
+}