works

NEOVIM_SETUP.md

@@ -0,0 +1,152 @@
+# Using GitHub Actions Language Server in Neovim
+
+## Prerequisites
+
+- Node.js 18+
+- Neovim 0.11+ with the new LSP config format
+
+## Setup Options
+
+### Option 1: Install from npm (Recommended)
+
+Once published, you can install globally:
+
+```bash
+npm install -g @actions/languageserver
+```
+
+Then configure Neovim to use the installed binary:
+
+```lua
+-- ~/.config/nvim/lsp/actionsls.lua
+return {
+  cmd = { "actions-languageserver" },
+  filetypes = { "yaml.ghaction" },  -- GitHub Actions workflow files only
+  root_markers = { ".git" },
+  init_options = {
+    sessionToken = vim.fn.system("gh auth token"):gsub("%s+", ""),
+    logLevel = "info",
+  },
+}
+```
+
+**Note:** This requires the package to be published to npm first.
+
+### Option 2: Local Development Build
+
+For development or if the npm package isn't published yet:
+
+### 1. Clone and build
+
+```bash
+git clone https://github.com/actions/languageservices.git
+cd languageservices
+npm install
+npm run build --workspaces --if-present
+```
+
+### 2. Bundle the server
+
+The server needs to be bundled into a single file to avoid ESM module resolution issues:
+
+```bash
+cd languageserver
+npx esbuild src/index.ts \
+  --bundle \
+  --platform=node \
+  --target=node18 \
+  --format=cjs \
+  --outfile=dist/server-bundled.cjs \
+  --external:vscode \
+  --loader:.json=json
+```
+
+This creates `dist/server-bundled.cjs` (~5.6MB) that contains the entire server.
+
+### 3. Configure Neovim
+
+Create `~/.config/nvim/lsp/actionsls.lua`:
+
+```lua
+return {
+  cmd = {
+    "/absolute/path/to/languageservices/languageserver/bin/actions-languageserver",
+  },
+  filetypes = { "yaml.ghaction" },  -- GitHub Actions workflow files only
+  root_markers = { ".git" },
+  init_options = {
+    sessionToken = vim.fn.system("gh auth token"):gsub("%s+", ""),
+    logLevel = "info",
+  },
+}
+```
+
+**Important:** Replace `/absolute/path/to/languageservices` with your actual clone path.
+
+## Filetype Detection for GitHub Actions Workflows
+
+To ensure the LSP only runs on GitHub Actions workflow files (not all YAML files), set up filetype detection:
+
+**Option A:** In `~/.config/nvim/init.lua`:
+
+```lua
+vim.api.nvim_create_autocmd({"BufRead", "BufNewFile"}, {
+  pattern = ".github/workflows/*.{yml,yaml}",
+  callback = function()
+    vim.bo.filetype = "yaml.ghaction"
+  end,
+})
+```
+
+**Option B:** Create `~/.config/nvim/ftdetect/ghaction.vim`:
+
+```vim
+au BufRead,BufNewFile .github/workflows/*.yml,*.yaml setfiletype yaml.ghaction
+```
+
+This sets the filetype to `yaml.ghaction` for files in `.github/workflows/`, matching the `filetypes` setting in your LSP config.
+
+### 4. Enable the LSP in your init.lua
+
+Add to your Neovim configuration:
+
+```lua
+vim.lsp.enable('actionsls')
+```
+
+### 5. Restart Neovim
+
+Open any `.github/workflows/*.yml` file. The filetype detection will set it to `yaml.ghaction`, and the language server will attach automatically.
+
+## Files Created
+
+- `languageserver/dist/server-bundled.cjs` - Bundled server (~5.6MB)
+- `languageserver/bin/actions-languageserver` - Shell wrapper script
+
+The `dist/` directory is gitignored; you'll need to rebuild after pulling updates.
+
+## Troubleshooting
+
+Check if the server is running:
+
+```vim
+:lua =vim.lsp.get_clients()
+```
+
+View LSP logs:
+
+```bash
+tail -f ~/.local/state/nvim/lsp.log
+```
+
+Manually start the server to test:
+
+```vim
+:lua vim.lsp.start({name='actionsls', cmd={'/path/to/bin/actions-languageserver'}, root_dir=vim.fn.getcwd(), init_options={sessionToken='', logLevel='info'}})
+```
+
+## Notes
+
+- The main code change is in `languageserver/src/index.ts` to use dynamic imports, avoiding loading browser modules in Node.js
+- The bundling step is necessary because TypeScript outputs ESM with bare imports that Node.js can't resolve
+- Only workflow files in git repositories will activate the LSP (due to `root_markers = { ".git" }`)

languageserver/bin/actions-languageserver

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+import "../dist/cli.bundle.cjs";

languageserver/package.json

@@ -32,6 +32,7 @@
   },
   "scripts": {
     "build": "tsc --build tsconfig.build.json",
+    "build:cli": "esbuild src/index.ts --bundle --platform=node --format=cjs --outfile=dist/cli.bundle.cjs",
     "clean": "rimraf dist",
     "format": "prettier --write '**/*.ts'",
     "format-check": "prettier --check '**/*.ts'",
@@ -42,6 +43,9 @@
     "test-watch": "NODE_OPTIONS=\"--experimental-vm-modules\" jest --watch",
     "watch": "tsc --build tsconfig.build.json --watch"
   },
+  "bin": {
+    "actions-languageserver": "./bin/actions-languageserver"
+  },
   "dependencies": {
     "@actions/languageservice": "^0.3.20",
     "@actions/workflow-parser": "^0.3.20",
@@ -61,6 +65,7 @@
     "@types/jest": "^29.0.3",
     "@typescript-eslint/eslint-plugin": "^5.56.0",
     "@typescript-eslint/parser": "^5.56.0",
+    "esbuild": "^0.27.1",
     "eslint": "^8.36.0",
     "eslint-config-prettier": "^8.8.0",
     "eslint-plugin-prettier": "^4.2.1",

languageserver/script/esbuild

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+npx esbuild src/index.ts \
+  --bundle \
+  --platform=node \
+  --target=node18 \
+  --format=cjs \
+  --outfile=dist/server-bundled.cjs \
+  --external:vscode \
+  --loader:.json=json

languageserver/src/connection.ts

@@ -1,8 +1,11 @@
-import {documentLinks, hover, validate, ValidationConfig} from "@actions/languageservice";
+import {documentLinks, getCodeActions, hover, validate, ValidationConfig} from "@actions/languageservice";
 import {registerLogger, setLogLevel} from "@actions/languageservice/log";
 import {clearCache, clearCacheEntry} from "@actions/languageservice/utils/workflow-cache";
 import {Octokit} from "@octokit/rest";
 import {
+  CodeAction,
+  CodeActionKind,
+  CodeActionParams,
   CompletionItem,
   Connection,
   DocumentLink,
@@ -72,6 +75,9 @@ export function initConnection(connection: Connection) {
         hoverProvider: true,
         documentLinkProvider: {
           resolveProvider: false
+        },
+        codeActionProvider: {
+          codeActionKinds: [CodeActionKind.QuickFix]
         }
       }
     };
@@ -158,6 +164,16 @@ export function initConnection(connection: Connection) {
     return documentLinks(getDocument(documents, textDocument), repoContext?.workspaceUri);
   });
 
+  connection.onCodeAction(async (params: CodeActionParams): Promise<CodeAction[]> => {
+    return timeOperation("codeAction", async () => {
+      return getCodeActions({
+        uri: params.textDocument.uri,
+        diagnostics: params.context.diagnostics,
+        only: params.context.only
+      });
+    });
+  });
+
   // Make the text document manager listen on the connection
   // for open, change and close text document events
   documents.listen(connection);

languageserver/src/index.ts

@@ -1,12 +1,12 @@
-import {Connection} from "vscode-languageserver";
+import { Connection } from "vscode-languageserver";
 import {
   BrowserMessageReader,
   BrowserMessageWriter,
   createConnection as createBrowserConnection
 } from "vscode-languageserver/browser";
-import {createConnection as createNodeConnection} from "vscode-languageserver/node";
+import { createConnection as createNodeConnection } from "vscode-languageserver/node";
 
-import {initConnection} from "./connection";
+import { initConnection } from "./connection";
 
 /** Helper function determining whether we are executing with node runtime */
 function isNode(): boolean {

languageservice/src/code-actions/index.ts

@@ -0,0 +1,54 @@
+import {CodeAction, CodeActionKind, Diagnostic} from "vscode-languageserver-types";
+import {CodeActionContext, CodeActionProvider} from "./types";
+import {quickfixProviders} from "./quickfix";
+
+// Aggregate all providers by kind
+const providersByKind: Map<string, CodeActionProvider[]> = new Map([
+  [CodeActionKind.QuickFix, quickfixProviders]
+  // [CodeActionKind. Refactor, refactorProviders],
+  // [CodeActionKind.Source, sourceProviders],
+  // etc
+]);
+
+export interface CodeActionConfig {
+  // TODO: actionsMetadataProvider, fileProvider, etc.
+}
+
+export interface CodeActionParams {
+  uri: string;
+  diagnostics: Diagnostic[];
+  only?: string[];
+}
+
+export function getCodeActions(params: CodeActionParams, config?: CodeActionConfig): CodeAction[] {
+  const actions: CodeAction[] = [];
+  const context: CodeActionContext = {
+    uri: params.uri
+  };
+
+  // Filter to requested kinds, or use all if none specified
+  const requestedKinds = params.only;
+  const kindsToCheck = requestedKinds
+    ? [...providersByKind.keys()].filter(kind => requestedKinds.some(requested => kind.startsWith(requested)))
+    : [...providersByKind.keys()];
+
+  for (const diagnostic of params.diagnostics) {
+    for (const kind of kindsToCheck) {
+      const providers = providersByKind.get(kind) ?? [];
+      for (const provider of providers) {
+        if (provider.diagnosticCodes.includes(diagnostic.code)) {
+          const action = provider.createCodeAction(context, diagnostic);
+          if (action) {
+            action.kind = kind;
+            action.diagnostics = [diagnostic];
+            actions.push(action);
+          }
+        }
+      }
+    }
+  }
+
+  return actions;
+}
+
+export type {CodeActionContext, CodeActionProvider} from "./types";

languageservice/src/code-actions/quickfix/add-missing-inputs.ts

@@ -0,0 +1,67 @@
+import { CodeAction, TextEdit } from "vscode-languageserver-types";
+import { CodeActionContext, CodeActionProvider } from "../types";
+import { DiagnosticCode, MissingInputsDiagnosticData } from "../../validate-action";
+
+export const addMissingInputsProvider: CodeActionProvider = {
+  diagnosticCodes: [DiagnosticCode.MissingRequiredInputs],
+
+  createCodeAction(context, diagnostic): CodeAction | undefined {
+    const data = diagnostic.data as MissingInputsDiagnosticData | undefined;
+    if (!data) {
+      return undefined;
+    }
+
+    const edits = createInputEdits(data);
+    if (!edits) {
+      return undefined;
+    }
+
+    const inputNames = data.missingInputs.map(i => i.name).join(", ");
+
+    return {
+      title: `Add missing input${data.missingInputs.length > 1 ? "s" : ""}: ${inputNames}`,
+      edit: {
+        changes: {
+          [context.uri]: edits,
+        },
+      },
+    };
+  },
+};
+
+function createInputEdits(data: MissingInputsDiagnosticData): TextEdit[] | undefined {
+  const edits: TextEdit[] = [];
+
+  if (data.hasWithKey && data.withIndent !== undefined) {
+    // `with:` exists - use its indentation + 2 for inputs
+    const inputIndent = " ".repeat(data.withIndent + 2);
+
+    const inputLines = data.missingInputs.map(input => {
+      const value = input.default !== undefined ? input.default : '""';
+      return `${inputIndent}${input.name}: ${value}`;
+    });
+
+    edits.push({
+      range: { start: data.insertPosition, end: data.insertPosition },
+      newText: inputLines.map(line => line + "\n").join(""),
+    });
+  } else {
+    // No `with:` key - `with:` at step indentation, inputs at step indentation + 2
+    const withIndent = " ".repeat(data.stepIndent);
+    const inputIndent = " ".repeat(data.stepIndent + 2);
+
+    const inputLines = data.missingInputs.map(input => {
+      const value = input.default !== undefined ? input.default : '""';
+      return `${inputIndent}${input.name}: ${value}`;
+    });
+
+    const newText = [`${withIndent}with:\n`, ...inputLines.map(line => `${line}\n`)].join("");
+
+    edits.push({
+      range: { start: data.insertPosition, end: data.insertPosition },
+      newText,
+    });
+  }
+
+  return edits;
+}

languageservice/src/code-actions/quickfix/index.ts

@@ -0,0 +1,4 @@
+import {CodeActionProvider} from "../types";
+import {addMissingInputsProvider} from "./add-missing-inputs";
+
+export const quickfixProviders: CodeActionProvider[] = [addMissingInputsProvider];

languageservice/src/code-actions/tests/runner.test.ts

@@ -0,0 +1,90 @@
+import * as path from "path";
+import {fileURLToPath} from "url";
+import {loadTestCases, runTestCase} from "./runner";
+import {ValidationConfig} from "../../validate";
+import {ActionMetadata, ActionReference} from "../../action";
+import {clearCache} from "../../utils/workflow-cache";
+
+// ESM-compatible __dirname
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+// Mock action metadata provider for tests
+const validationConfig: ValidationConfig = {
+  actionsMetadataProvider: {
+    fetchActionMetadata: (ref: ActionReference): Promise<ActionMetadata | undefined> => {
+      const key = `${ref.owner}/${ref.name}@${ref.ref}`;
+
+      const metadata: Record<string, ActionMetadata> = {
+        "actions/cache@v1": {
+          name: "Cache",
+          description: "Cache dependencies",
+          inputs: {
+            path: {
+              description: "A list of files to cache",
+              required: true
+            },
+            key: {
+              description: "Cache key",
+              required: true
+            },
+            "restore-keys": {
+              description: "Restore keys",
+              required: false
+            }
+          }
+        },
+        "actions/setup-node@v3": {
+          name: "Setup Node",
+          description: "Setup Node. js",
+          inputs: {
+            "node-version": {
+              description: "Node version",
+              required: true,
+              default: "16"
+            }
+          }
+        }
+      };
+
+      return Promise.resolve(metadata[key]);
+    }
+  }
+};
+
+// Point to the source testdata directory
+const testdataDir = path.join(__dirname, "testdata");
+
+beforeEach(() => {
+  clearCache();
+});
+
+describe("code action golden tests", () => {
+  const testCases = loadTestCases(testdataDir);
+
+  if (testCases.length === 0) {
+    it.todo("no test cases found - add . yml files to testdata/");
+    return;
+  }
+
+  for (const testCase of testCases) {
+    it(testCase.name, async () => {
+      const result = await runTestCase(testCase, validationConfig);
+
+      if (!result.passed) {
+        let errorMessage = result.error || "Test failed";
+
+        if (result.expected !== undefined && result.actual !== undefined) {
+          errorMessage += "\n\n";
+          errorMessage += "=== EXPECTED (golden file) ===\n";
+          errorMessage += result.expected;
+          errorMessage += "\n\n";
+          errorMessage += "=== ACTUAL ===\n";
+          errorMessage += result.actual;
+        }
+
+        throw new Error(errorMessage);
+      }
+    });
+  }
+});

languageservice/src/code-actions/tests/runner.ts

@@ -0,0 +1,227 @@
+import * as fs from "fs";
+import * as path from "path";
+import { TextEdit } from "vscode-languageserver-types";
+import { TextDocument } from "vscode-languageserver-textdocument";
+import { validate, ValidationConfig } from "../../validate";
+import { getCodeActions, CodeActionParams } from "../index";
+
+// Marker pattern: # want "diagnostic message" fix="code-action-name"
+const MARKER_PATTERN = /#\s*want\s+"([^"]+)"(?:\s+fix="([^"]+)")?/;
+
+export interface TestCase {
+  name: string;
+  inputPath: string;
+  goldenPath: string;
+  input: string;
+  golden: string;
+  markers: Marker[];
+}
+
+export interface Marker {
+  line: number;
+  message: string;
+  fix?: string;
+}
+
+export interface TestResult {
+  name: string;
+  passed: boolean;
+  error?: string;
+  expected?: string;
+  actual?: string;
+}
+
+/**
+ * Parse markers from input file content
+ */
+export function parseMarkers(content: string): Marker[] {
+  const lines = content.split("\n");
+  const markers: Marker[] = [];
+
+  for (let i = 0; i < lines.length; i++) {
+    const match = lines[i].match(MARKER_PATTERN);
+    if (match) {
+      markers.push({
+        line: i,
+        message: match[1],
+        fix: match[2]
+      });
+    }
+  }
+
+  return markers;
+}
+
+/**
+ * Strip markers from content (for processing)
+ */
+export function stripMarkers(content: string): string {
+  return content
+    .split("\n")
+    .map(line => line.replace(MARKER_PATTERN, "").trimEnd())
+    .join("\n");
+}
+
+/**
+ * Load all test cases from a testdata directory
+ */
+export function loadTestCases(testdataDir: string): TestCase[] {
+  const testCases: TestCase[] = [];
+
+  function walkDir(dir: string) {
+    const entries = fs.readdirSync(dir, { withFileTypes: true });
+
+    for (const entry of entries) {
+      const fullPath = path.join(dir, entry.name);
+
+      if (entry.isDirectory()) {
+        walkDir(fullPath);
+      } else if (entry.isFile() && entry.name.endsWith(".yml") && !entry.name.endsWith(". golden.yml")) {
+        const goldenPath = fullPath.replace(".yml", ".golden.yml");
+
+        if (fs.existsSync(goldenPath)) {
+          const input = fs.readFileSync(fullPath, "utf-8");
+          const golden = fs.readFileSync(goldenPath, "utf-8");
+
+          testCases.push({
+            name: path.relative(testdataDir, fullPath),
+            inputPath: fullPath,
+            goldenPath,
+            input,
+            golden,
+            markers: parseMarkers(input)
+          });
+        }
+      }
+    }
+  }
+
+  walkDir(testdataDir);
+  return testCases;
+}
+
+/**
+ * Apply text edits to a document
+ */
+export function applyEdits(content: string, edits: TextEdit[]): string {
+  // Sort edits in reverse order by position to apply from bottom to top
+  const sortedEdits = [...edits].sort((a, b) => {
+    if (b.range.start.line !== a.range.start.line) {
+      return b.range.start.line - a.range.start.line;
+    }
+    return b.range.start.character - a.range.start.character;
+  });
+
+  const lines = content.split("\n");
+
+  for (const edit of sortedEdits) {
+    const startLine = edit.range.start.line;
+    const startChar = edit.range.start.character;
+    const endLine = edit.range.end.line;
+    const endChar = edit.range.end.character;
+
+    const before = lines[startLine].slice(0, startChar);
+    const after = lines[endLine].slice(endChar);
+
+    const newLines = edit.newText.split("\n");
+    newLines[0] = before + newLines[0];
+    newLines[newLines.length - 1] = newLines[newLines.length - 1] + after;
+
+    lines.splice(startLine, endLine - startLine + 1, ...newLines);
+  }
+
+  return lines.join("\n");
+}
+
+/**
+ * Run a single test case
+ */
+export async function runTestCase(testCase: TestCase, validationConfig: ValidationConfig): Promise<TestResult> {
+  const strippedInput = stripMarkers(testCase.input);
+  const document = TextDocument.create("file:///test.yml", "yaml", 1, strippedInput);
+
+  // 1. Validate and get diagnostics
+  const diagnostics = await validate(document, validationConfig);
+
+  // 2.  Verify all expected diagnostics are present
+  const missingDiagnostics: string[] = [];
+  for (const marker of testCase.markers) {
+    const found = diagnostics.find(d => d.range.start.line === marker.line && d.message.includes(marker.message));
+    console.log(found);
+    if (!found) {
+      missingDiagnostics.push(`line ${marker.line}: "${marker.message}"`);
+    }
+  }
+
+  if (missingDiagnostics.length > 0) {
+    return {
+      name: testCase.name,
+      passed: false,
+      error: `Missing expected diagnostics:\n  ${missingDiagnostics.join(
+        "\n  "
+      )}\n\nActual diagnostics:\n  ${diagnostics.map(d => `line ${d.range.start.line}: "${d.message}"`).join("\n  ")}`
+    };
+  }
+
+  // 3.  Collect all edits from all matching code actions
+  const allEdits: TextEdit[] = [];
+
+  for (const marker of testCase.markers) {
+    if (!marker.fix) {
+      continue;
+    }
+
+    const diagnostic = diagnostics.find(d => d.range.start.line === marker.line && d.message.includes(marker.message));
+
+    if (!diagnostic) {
+      continue; // Already reported above
+    }
+
+    const params: CodeActionParams = {
+      uri: document.uri,
+      diagnostics: [diagnostic]
+    };
+
+    const actions = getCodeActions(params);
+    const matchingAction = actions.find(a => a.title.toLowerCase().includes(marker.fix!.toLowerCase()));
+
+    if (!matchingAction) {
+      return {
+        name: testCase.name,
+        passed: false,
+        error: `Code action "${marker.fix}" not found for diagnostic on line ${marker.line}.\nAvailable actions: ${actions.map(a => a.title).join(", ") || "(none)"
+          }`
+      };
+    }
+
+    if (!matchingAction.edit?.changes) {
+      return {
+        name: testCase.name,
+        passed: false,
+        error: `Code action "${marker.fix}" has no edits`
+      };
+    }
+
+    const edits = matchingAction.edit.changes[document.uri] || [];
+    allEdits.push(...edits);
+  }
+
+  // 4. Apply all edits and compare to golden file
+  const actualOutput = applyEdits(strippedInput, allEdits);
+  const expectedOutput = testCase.golden;
+
+  if (actualOutput.trim() !== expectedOutput.trim()) {
+    return {
+      name: testCase.name,
+      passed: false,
+      error: "Output does not match golden file",
+      expected: expectedOutput,
+      actual: actualOutput
+    };
+  }
+
+  return {
+    name: testCase.name,
+    passed: true
+  };
+}

languageservice/src/code-actions/tests/testdata/quickfix/existing-with-key-without-inputs.golden.yml

@@ -0,0 +1,9 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v1
+        with:
+          path: ""
+          key: ""

languageservice/src/code-actions/tests/testdata/quickfix/existing-with-key-without-inputs.yml

@@ -0,0 +1,7 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v1
+        with: # want "Missing required inputs: `path`, `key`" fix="Add missing inputs: path, key"

languageservice/src/code-actions/tests/testdata/quickfix/existing-with-key.golden.yml

@@ -0,0 +1,10 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v1
+        with:
+          restore-keys: ${{ runner.os }}-
+          path: ""
+          key: ""

languageservice/src/code-actions/tests/testdata/quickfix/existing-with-key.yml

@@ -0,0 +1,8 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v1
+        with: # want "Missing required inputs: `path`, `key`" fix="Add missing inputs: path, key"
+          restore-keys: ${{ runner.os }}-

languageservice/src/code-actions/tests/testdata/quickfix/no-with-key.golden.yml

@@ -0,0 +1,9 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v1
+        with:
+          path: ""
+          key: ""

languageservice/src/code-actions/tests/testdata/quickfix/no-with-key.yml

@@ -0,0 +1,6 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/cache@v1 # want "Missing required inputs: `path`, `key`" fix="Add missing inputs: path, key"

languageservice/src/code-actions/types.ts

@@ -0,0 +1,21 @@
+import {CodeAction, Diagnostic} from "vscode-languageserver-types";
+
+export interface CodeActionContext {
+  uri: string;
+  // TODO: add things like workflow template, parsed content, etc.
+}
+
+/**
+ * A provider that can produce a code action for a given diagnostic
+ */
+export interface CodeActionProvider {
+  /**
+   * The diagnostic codes this provider handles
+   */
+  diagnosticCodes: (string | number | undefined)[];
+
+  /**
+   * Create a code action for the diagnostic, if applicable
+   */
+  createCodeAction(context: CodeActionContext, diagnostic: Diagnostic): CodeAction | undefined;
+}

languageservice/src/index.ts

@@ -5,3 +5,4 @@ export {hover} from "./hover";
 export {Logger, LogLevel, registerLogger, setLogLevel} from "./log";
 export {validate, ValidationConfig, ActionsMetadataProvider} from "./validate";
 export {ValueProviderConfig, ValueProviderKind} from "./value-providers/config";
+export {getCodeActions} from "./code-actions";

languageservice/src/validate-action.ts

@@ -1,12 +1,30 @@
-import {isMapping} from "@actions/workflow-parser";
+import { isMapping } from "@actions/workflow-parser";
-import {isActionStep} from "@actions/workflow-parser/model/type-guards";
+import { isActionStep } from "@actions/workflow-parser/model/type-guards";
-import {Step} from "@actions/workflow-parser/model/workflow-template";
+import { Step } from "@actions/workflow-parser/model/workflow-template";
-import {ScalarToken} from "@actions/workflow-parser/templates/tokens/scalar-token";
+import { ScalarToken } from "@actions/workflow-parser/templates/tokens/scalar-token";
-import {TemplateToken} from "@actions/workflow-parser/templates/tokens/template-token";
+import { TemplateToken } from "@actions/workflow-parser/templates/tokens/template-token";
-import {Diagnostic, DiagnosticSeverity} from "vscode-languageserver-types";
+import { Diagnostic, DiagnosticSeverity } from "vscode-languageserver-types";
-import {parseActionReference} from "./action";
+import { ActionReference, parseActionReference } from "./action";
-import {mapRange} from "./utils/range";
+import { mapRange } from "./utils/range";
-import {ValidationConfig} from "./validate";
+import { ValidationConfig } from "./validate";
+
+export const DiagnosticCode = {
+  MissingRequiredInputs: "missing-required-inputs"
+} as const;
+
+export interface MissingInputsDiagnosticData {
+  action: ActionReference;
+  missingInputs: Array<{
+    name: string;
+    default?: string;
+  }>;
+  hasWithKey: boolean;
+  // Indentation of the `with:` key if present, or the step's base indentation
+  withIndent?: number;
+  stepIndent: number;
+  // Position where new content should be inserted
+  insertPosition: { line: number; character: number };
+}
 
 export async function validateAction(
   diagnostics: Diagnostic[],
@@ -35,7 +53,7 @@ export async function validateAction(
 
   let withKey: ScalarToken | undefined;
   let withToken: TemplateToken | undefined;
-  for (const {key, value} of stepToken) {
+  for (const { key, value } of stepToken) {
     if (key.toString() === "with") {
       withKey = key;
       withToken = value;
@@ -45,7 +63,7 @@ export async function validateAction(
 
   const stepInputs = new Map<string, ScalarToken>();
   if (withToken && isMapping(withToken)) {
-    for (const {key} of withToken) {
+    for (const { key } of withToken) {
       stepInputs.set(key.toString(), key);
     }
   }
@@ -83,10 +101,47 @@ export async function validateAction(
       missingRequiredInputs.length === 1
         ? `Missing required input \`${missingRequiredInputs[0][0]}\``
         : `Missing required inputs: ${missingRequiredInputs.map(input => `\`${input[0]}\``).join(", ")}`;
+
+    const stepIndent = stepToken.range ? stepToken.range.start.column - 1 : 0; // 0-indexed
+    const withIndent = withKey?.range ? withKey.range.start.column - 1 : undefined;
+
+    // Calculate insert position
+    // For withToken, we need to handle empty mappings specially - insert after the with: line
+    let insertPosition: { line: number; character: number };
+    if (withToken?.range) {
+      // Check if with: has any children by comparing start and end lines
+      const hasChildren = stepInputs.size > 0;
+      if (hasChildren) {
+        // Insert after the last child
+        insertPosition = { line: withToken.range.end.line - 1, character: 0 };
+      } else {
+        // Empty with: block - insert on the next line after with:
+        insertPosition = { line: withKey!.range!.end.line, character: 0 };
+      }
+    } else if (stepToken.range) {
+      insertPosition = { line: stepToken.range.end.line - 1, character: 0 };
+    } else {
+      insertPosition = { line: 0, character: 0 };
+    }
+
+    const diagnosticData: MissingInputsDiagnosticData = {
+      action,
+      missingInputs: missingRequiredInputs.map(([name, input]) => ({
+        name,
+        default: input.default
+      })),
+      hasWithKey: withKey !== undefined,
+      withIndent,
+      stepIndent,
+      insertPosition
+    };
+
     diagnostics.push({
       severity: DiagnosticSeverity.Error,
       range: mapRange((withKey || stepToken).range), // Highlight the whole step if we don't have a with key
-      message: message
+      message: message,
+      code: DiagnosticCode.MissingRequiredInputs,
+      data: diagnosticData
     });
   }
 }

languageservice/src/validate.actions.test.ts

@@ -249,7 +249,28 @@ jobs:
             line: 7
           }
         },
-        severity: DiagnosticSeverity.Error
+        severity: DiagnosticSeverity.Error,
+        code: "missing-required-inputs",
+        data: {
+          action: {
+            name: "cache",
+            owner: "actions",
+            ref: "v1"
+          },
+          hasWithKey: true,
+          insertPosition: {
+            character: 0,
+            line: 9
+          },
+          missingInputs: [
+            {
+              default: undefined,
+              name: "path"
+            }
+          ],
+          stepIndent: 6,
+          withIndent: 6
+        }
       }
     ]);
   });
@@ -294,7 +315,32 @@ jobs:
             line: 7
           }
         },
-        severity: DiagnosticSeverity.Error
+        severity: DiagnosticSeverity.Error,
+        code: "missing-required-inputs",
+        data: {
+          action: {
+            name: "cache",
+            owner: "actions",
+            ref: "v1"
+          },
+          hasWithKey: true,
+          insertPosition: {
+            character: 0,
+            line: 9
+          },
+          missingInputs: [
+            {
+              default: undefined,
+              name: "path"
+            },
+            {
+              default: undefined,
+              name: "key"
+            }
+          ],
+          stepIndent: 6,
+          withIndent: 6
+        }
       }
     ]);
   });
@@ -323,7 +369,32 @@ jobs:
             line: 6
           }
         },
-        severity: DiagnosticSeverity.Error
+        severity: DiagnosticSeverity.Error,
+        code: "missing-required-inputs",
+        data: {
+          action: {
+            name: "cache",
+            owner: "actions",
+            ref: "v1"
+          },
+          hasWithKey: false,
+          insertPosition: {
+            character: 0,
+            line: 7
+          },
+          missingInputs: [
+            {
+              default: undefined,
+              name: "path"
+            },
+            {
+              default: undefined,
+              name: "key"
+            }
+          ],
+          stepIndent: 6,
+          withIndent: undefined
+        }
       }
     ]);
   });

package-lock.json

@@ -406,10 +406,14 @@
         "vscode-languageserver-textdocument": "^1.0.7",
         "yaml": "^2.1.3"
       },
+      "bin": {
+        "actions-languageserver": "bin/actions-languageserver"
+      },
       "devDependencies": {
         "@types/jest": "^29.0.3",
         "@typescript-eslint/eslint-plugin": "^5.56.0",
         "@typescript-eslint/parser": "^5.56.0",
+        "esbuild": "^0.27.1",
         "eslint": "^8.36.0",
         "eslint-config-prettier": "^8.8.0",
         "eslint-plugin-prettier": "^4.2.1",
@@ -475,6 +479,7 @@
       "resolved": "https://registry.npmjs.org/@octokit/core/-/core-6.1.5.tgz",
       "integrity": "sha512-vvmsN0r7rguA+FySiCsbaTTobSftpIDIpPW81trAmsv9TGxg3YCujAxRYp/Uy8xmDgYCzzgulG62H7KYUFmeIg==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@octokit/auth-token": "^5.0.0",
         "@octokit/graphql": "^8.2.2",
@@ -1313,6 +1318,7 @@
       "version": "7.20.2",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@ampproject/remapping": "^2.1.0",
         "@babel/code-frame": "^7.18.6",
@@ -1890,6 +1896,448 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.27.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.1.tgz",
+      "integrity": "sha512-HHB50pdsBX6k47S4u5g/CaLjqS3qwaOVE5ILsq64jyzgMhLuCuZ8rGzM9yhsAjfjkbgUPMzZEPa7DAp7yz6vuA==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.27.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.1.tgz",
+      "integrity": "sha512-kFqa6/UcaTbGm/NncN9kzVOODjhZW8e+FRdSeypWe6j33gzclHtwlANs26JrupOntlcWmB0u8+8HZo8s7thHvg==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.27.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.27.1.tgz",
+      "integrity": "sha512-45fuKmAJpxnQWixOGCrS+ro4Uvb4Re9+UTieUY2f8AEc+t7d4AaZ6eUJ3Hva7dtrxAAWHtlEFsXFMAgNnGU9uQ==",
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+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-x64": {
+      "version": "0.27.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.27.1.tgz",
+      "integrity": "sha512-LBEpOz0BsgMEeHgenf5aqmn/lLNTFXVfoWMUox8CtWWYK9X4jmQzWjoGoNb8lmAYml/tQ/Ysvm8q7szu7BoxRQ==",
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+        "x64"
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+        "android"
+      ],
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+      }
+    },
+    "node_modules/@esbuild/darwin-arm64": {
+      "version": "0.27.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.27.1.tgz",
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+        "darwin"
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+      "version": "0.27.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.27.1.tgz",
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+        "x64"
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