Add "copy" button to all output boxes

resources/js/vue/components/shared/CodeBox.vue

@@ -1,25 +1,45 @@
 <template>
-  <pre
-    class="tw-font-mono tw-bg-gray-100 tw-p-2 tw-whitespace-pre-wrap tw-break-all tw-overflow-hidden"
-    :class="{ 'tw-border': bordered, 'tw-rounded': bordered }"
-  ><template
-    v-for="segment in textSegments"
-  ><a
-    v-if="segment.href"
-    class="tw-link tw-link-hover tw-link-info"
-    :href="segment.href"
-  >{{ segment.text }}</a><span
-    v-else
-    v-html="segment.text"
-  /></template></pre>
+  <div class="tw-relative">
+    <button
+      v-if="showCopyButton && String(text).length > 0"
+      type="button"
+      class="tw-btn tw-btn-ghost tw-btn-sm tw-absolute tw-top-1 tw-right-1"
+      :title="copied ? 'Copied!' : 'Copy'"
+      data-test="copy-button"
+      @click="copyText"
+    >
+      <FontAwesomeIcon :icon="copied ? FA.faCheck : FA.faCopy" />
+    </button>
+
+    <!-- Must be formatted like this to avoid extra whitespace -->
+    <pre
+      class="tw-font-mono tw-bg-gray-100 tw-p-2 tw-whitespace-pre-wrap tw-break-all tw-overflow-hidden"
+      :class="{ 'tw-border': bordered, 'tw-rounded': bordered }"
+    ><template
+      v-for="segment in textSegments"
+    ><a
+      v-if="segment.href"
+      class="tw-link tw-link-hover tw-link-info"
+      :href="segment.href"
+    >{{ segment.text }}</a><span
+      v-else
+      v-html="segment.text"
+    /></template></pre>
+  </div>
 </template>
 
 <script>
 import { AnsiUp } from 'ansi_up';
+import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome';
+import { faCopy, faCheck } from '@fortawesome/free-solid-svg-icons';
 
 export default {
   name: 'CodeBox',
 
+  components: {
+    FontAwesomeIcon,
+  },
+
   props: {
     text: {
       type: String,
@@ -39,9 +59,27 @@ export default {
       required: false,
       default: undefined,
     },
+
+    showCopyButton: {
+      type: Boolean,
+      default: true,
+    },
+  },
+
+  data() {
+    return {
+      copied: false,
+    };
   },
 
   computed: {
+    FA() {
+      return {
+        faCopy,
+        faCheck,
+      };
+    },
+
     ansiText() {
       const escapedText = String(this.text).replace(/\[NON-XML-CHAR-0x1B\]/g, '\x1B') ?? '';
       return (new AnsiUp).ansi_to_html(escapedText);
@@ -97,5 +135,20 @@ export default {
       return segments;
     },
   },
+
+  methods: {
+    async copyText() {
+      try {
+        await navigator.clipboard.writeText(String(this.text));
+        this.copied = true;
+        setTimeout(() => {
+          this.copied = false;
+        }, 2000);
+      }
+      catch (err) {
+        console.error('Failed to copy: ', err);
+      }
+    },
+  },
 };
 </script>

tests/cypress/component/code-box.cy.js

@@ -77,4 +77,65 @@ describe('CodeBox', () => {
     cy.get('a').eq(0).should('have.attr', 'href', 'https://example.com');
     cy.get('a').eq(1).should('have.attr', 'href', 'https://example.com');
   });
+
+  it('shows the copy button by default when text is present', () => {
+    cy.mount(CodeBox, {
+      props: {
+        text: 'some text',
+      },
+    });
+
+    cy.get('[data-test="copy-button"]').should('exist');
+  });
+
+  it('hides the copy button when showCopyButton is false', () => {
+    cy.mount(CodeBox, {
+      props: {
+        text: 'some text',
+        showCopyButton: false,
+      },
+    });
+
+    cy.get('[data-test="copy-button"]').should('not.exist');
+  });
+
+  it('hides the copy button when the text is empty', () => {
+    cy.mount(CodeBox, {
+      props: {
+        text: '',
+      },
+    });
+
+    cy.get('[data-test="copy-button"]').should('not.exist');
+  });
+
+  it('hides the copy button when the text becomes empty', () => {
+    cy.mount(CodeBox, {
+      props: {
+        text: 'some text',
+      },
+    }).then(({ wrapper }) => {
+      cy.get('[data-test="copy-button"]').should('exist').then(() => {
+        wrapper.setProps({ text: '' });
+        cy.get('[data-test="copy-button"]').should('not.exist');
+      });
+    });
+  });
+
+  it('copies the text to the clipboard when the copy button is clicked', () => {
+    const code = 'const message = "Hello, World!";';
+
+    cy.mount(CodeBox, {
+      props: {
+        text: code,
+      },
+    }).then(() => {
+      cy.window().then((win) => {
+        cy.stub(win.navigator.clipboard, 'writeText').resolves().as('writeText');
+      });
+
+      cy.get('[data-test="copy-button"]').click();
+      cy.get('@writeText').should('have.been.calledWith', code);
+    });
+  });
 });

tests/cypress/e2e/tests.cy.js

@@ -63,13 +63,13 @@ describe('the test page', () => {
     // expand the test command line
     cy.get('a#commandlinelink').should('contain', 'Show Command Line').click();
     cy.get('a#commandlinelink').should('contain', 'Hide Command Line');
-    cy.get('pre#commandline').should('contain', '/a/path/to/test/nap --run-test .');
+    cy.get('#commandline').should('contain', '/a/path/to/test/nap --run-test .');
     // toggle it back
     cy.get('a#commandlinelink').click();
     cy.get('a#commandlinelink').should('contain', 'Show Command Line');
 
     // verify the test output field
-    cy.get('pre#test_output').should('contain', 'PASS');
+    cy.get('#test_output').should('contain', 'PASS');
   });