Add a language definition for ddn CLI

src/theme/prism-include-languages.ts

@@ -0,0 +1,31 @@
+import siteConfig from '@generated/docusaurus.config';
+import type * as PrismNamespace from 'prismjs';
+import type { Optional } from 'utility-types';
+
+export default function prismIncludeLanguages(PrismObject: typeof PrismNamespace): void {
+  const {
+    themeConfig: { prism },
+  } = siteConfig;
+  const { additionalLanguages } = prism as { additionalLanguages: string[] };
+
+  // Prism components work on the Prism instance on the window, while prism-
+  // react-renderer uses its own Prism instance. We temporarily mount the
+  // instance onto window, import components to enhance it, then remove it to
+  // avoid polluting global namespace.
+  // You can mutate PrismObject: registering plugins, deleting languages... As
+  // long as you don't re-assign it
+  globalThis.Prism = PrismObject;
+
+  additionalLanguages.forEach(lang => {
+    if (lang === 'php') {
+      // eslint-disable-next-line global-require
+      require('prismjs/components/prism-markup-templating.js');
+    }
+    // eslint-disable-next-line global-require, import/no-dynamic-require
+    require(`prismjs/components/prism-${lang}`);
+  });
+
+  require('/static/prismjs/ddn.js');
+
+  delete (globalThis as Optional<typeof globalThis, 'Prism'>).Prism;
+}

static/prismjs/ddn.js

@@ -0,0 +1,47 @@
+Prism.languages.ddn = {
+  cli: {
+    pattern: /\bddn\b/,
+    alias: 'keyword',
+  },
+  flag: {
+    pattern: /--?[\w-]+/,
+    alias: 'attr-name',
+  },
+  // Specific argument types first
+  path: {
+    // Optional ./ ../ / prefix, segments with word chars/hyphens, optional extension
+    pattern: /(?:\.\.?\/|\/)?(?:[\w-]+(?:\/[\w-]+)*)(?:\.\w+)?/,
+    greedy: true, // Match longest path first
+    alias: 'string',
+  },
+  'connector-type': {
+    pattern: /\b\w+\/\w+\b/, // e.g., hasura/postgres
+    alias: 'class-name',
+  },
+  'versioned-name': {
+    // e.g., globals:c15b0b4031 or subgraph:version
+    pattern: /\b[a-zA-Z_][\w-]*:[a-zA-Z0-9][\w-]*\b/,
+    alias: 'namespace',
+  },
+  'key-value': {
+    // e.g. key=value used in --env flag
+    pattern: /\b\w+=\S+/,
+    alias: 'property',
+  },
+  number: {
+    pattern: /\b\d+\b/,
+    alias: 'number',
+  },
+  // Subcommands before general arguments
+  subcommand: {
+    // List all known subcommand parts from filenames + common ones
+    pattern:
+      /\b(?:project|command|connector|connector-link|model|relationship|subgraph|supergraph|auth|codemod|completion|console|context|help|plugins|run|update-cli|version|init|add|list|remove|show|update|bash|fish|powershell|zsh|generate-promptql-secret-key|login|upgrade-context-v2-to-v3|upgrade-graphqlconfig-aggregate|upgrade-graphqlconfig-subscriptions|upgrade-model-v1-to-v2|upgrade-object-boolean-expression-types|upgrade-project-config-v2-to-v3|upgrade-supergraph-config-v1-to-v2|create-context|get-context|get-current-context|get|set-current-context|set|unset|doctor|build|delete|diff|local|set-self-hosted-engine-url|prune|apply|create|env|introspect|plugin|setenv|show-resources|add-resources|install|uninstall|upgrade|set-api-access-mode|logs)\b/,
+    alias: 'function',
+  },
+  // General argument should be last
+  argument: {
+    pattern: /\b[a-zA-Z_][\w-]*\b/, // Allows leading underscore
+    alias: 'variable',
+  },
+};