Add an ansi theme. (#152)

Add the gradient used by the ascii art logo to theme.

packages/cli/src/ui/themes/ansi.ts

@@ -0,0 +1,138 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { ansiTheme, Theme } from './theme.js';
+
+export const ANSI: Theme = new Theme(
+  'ANSI colors only',
+  {
+    hljs: {
+      display: 'block',
+      overflowX: 'auto',
+      padding: '0.5em',
+      background: 'black', // Mapped from #1E1E1E
+      color: 'white', // Mapped from #DCDCDC
+    },
+    'hljs-keyword': {
+      color: 'blue', // Mapped from #569CD6
+    },
+    'hljs-literal': {
+      color: 'blue', // Mapped from #569CD6
+    },
+    'hljs-symbol': {
+      color: 'blue', // Mapped from #569CD6
+    },
+    'hljs-name': {
+      color: 'blue', // Mapped from #569CD6
+    },
+    'hljs-link': {
+      color: 'blue', // Mapped from #569CD6
+      // textDecoration is ignored by Theme class
+    },
+    'hljs-built_in': {
+      color: 'cyan', // Mapped from #4EC9B0
+    },
+    'hljs-type': {
+      color: 'cyan', // Mapped from #4EC9B0
+    },
+    'hljs-number': {
+      color: 'green', // Mapped from #B8D7A3
+    },
+    'hljs-class': {
+      color: 'green', // Mapped from #B8D7A3
+    },
+    'hljs-string': {
+      color: 'yellow', // Mapped from #D69D85
+    },
+    'hljs-meta-string': {
+      color: 'yellow', // Mapped from #D69D85
+    },
+    'hljs-regexp': {
+      color: 'red', // Mapped from #9A5334
+    },
+    'hljs-template-tag': {
+      color: 'red', // Mapped from #9A5334
+    },
+    'hljs-subst': {
+      color: 'white', // Mapped from #DCDCDC
+    },
+    'hljs-function': {
+      color: 'white', // Mapped from #DCDCDC
+    },
+    'hljs-title': {
+      color: 'white', // Mapped from #DCDCDC
+    },
+    'hljs-params': {
+      color: 'white', // Mapped from #DCDCDC
+    },
+    'hljs-formula': {
+      color: 'white', // Mapped from #DCDCDC
+    },
+    'hljs-comment': {
+      color: 'green', // Mapped from #57A64A
+      // fontStyle is ignored by Theme class
+    },
+    'hljs-quote': {
+      color: 'green', // Mapped from #57A64A
+      // fontStyle is ignored by Theme class
+    },
+    'hljs-doctag': {
+      color: 'green', // Mapped from #608B4E
+    },
+    'hljs-meta': {
+      color: 'gray', // Mapped from #9B9B9B
+    },
+    'hljs-meta-keyword': {
+      color: 'gray', // Mapped from #9B9B9B
+    },
+    'hljs-tag': {
+      color: 'gray', // Mapped from #9B9B9B
+    },
+    'hljs-variable': {
+      color: 'magenta', // Mapped from #BD63C5
+    },
+    'hljs-template-variable': {
+      color: 'magenta', // Mapped from #BD63C5
+    },
+    'hljs-attr': {
+      color: 'bluebright', // Mapped from #9CDCFE
+    },
+    'hljs-attribute': {
+      color: 'bluebright', // Mapped from #9CDCFE
+    },
+    'hljs-builtin-name': {
+      color: 'bluebright', // Mapped from #9CDCFE
+    },
+    'hljs-section': {
+      color: 'yellow', // Mapped from gold
+    },
+    'hljs-emphasis': {
+      // fontStyle is ignored by Theme class
+    },
+    'hljs-strong': {
+      // fontWeight is ignored by Theme class
+    },
+    'hljs-bullet': {
+      color: 'yellow', // Mapped from #D7BA7D
+    },
+    'hljs-selector-tag': {
+      color: 'yellow', // Mapped from #D7BA7D
+    },
+    'hljs-selector-id': {
+      color: 'yellow', // Mapped from #D7BA7D
+    },
+    'hljs-selector-class': {
+      color: 'yellow', // Mapped from #D7BA7D
+    },
+    'hljs-selector-attr': {
+      color: 'yellow', // Mapped from #D7BA7D
+    },
+    'hljs-selector-pseudo': {
+      color: 'yellow', // Mapped from #D7BA7D
+    },
+  },
+  ansiTheme,
+);