Introduce Validate Method

src/bin.ts

@@ -2,6 +2,7 @@
 import * as yargs from "yargs";
 import { build } from "./commands/build";
 import { watch } from "./commands/watch";
+import { validate } from "./commands/validate";
 
 yargs
     .scriptName("github-actions-wac")
@@ -18,4 +19,10 @@ yargs
         {},
         watch
     )
+    .command(
+        "validate",
+        `Ensures "*.wac.ts" files are in sync with generated YAML files.`,
+        {},
+        validate
+    )
     .help().argv;

src/commands/build.ts

@@ -2,20 +2,13 @@ import * as fs from "fs";
 import * as path from "path";
 import jsYaml from "js-yaml";
 import debug from "debug";
-import { getWorkflowsPaths, clearImportCache } from "./utils";
+import { getWorkflowsPaths, clearImportCache, TOP_YAML_WORKFLOW_COMMENT } from "./utils";
 import * as tsNode from "ts-node";
 
 const log = debug("ghawac");
 
 const relativePath = p => path.relative(process.cwd(), p);
 
-const TOP_YAML_WORKFLOW_COMMENT = [
-    "# This file was automatically generated by github-actions-wac.",
-    "# DO NOT MODIFY IT BY HAND. Instead, modify the source *.wac.ts file(s)",
-    '# and run "github-actions-wac build" (or "ghawac build") to regenerate this file.',
-    '# For more information, run "github-actions-wac --help".'
-].join("\n");
-
 let tsNodeRegistered = false;
 const registerTsNode = (options = {}) => {
     if (tsNodeRegistered) {

src/commands/utils.ts

@@ -13,3 +13,10 @@ export const clearImportCache = () => {
         delete require.cache[key];
     });
 };
+
+export const TOP_YAML_WORKFLOW_COMMENT = [
+    "# This file was automatically generated by github-actions-wac.",
+    "# DO NOT MODIFY IT BY HAND. Instead, modify the source *.wac.ts file(s)",
+    '# and run "github-actions-wac build" (or "ghawac build") to regenerate this file.',
+    '# For more information, run "github-actions-wac --help".'
+].join("\n");

src/commands/validate.ts

@@ -0,0 +1,70 @@
+import * as fs from "fs";
+import * as path from "path";
+import jsYaml from "js-yaml";
+import debug from "debug";
+import { getWorkflowsPaths, TOP_YAML_WORKFLOW_COMMENT } from "./utils";
+import * as tsNode from "ts-node";
+
+const log = debug("ghawac");
+
+const relativePath = p => path.relative(process.cwd(), p);
+
+let tsNodeRegistered = false;
+const registerTsNode = (options = {}) => {
+    if (tsNodeRegistered) {
+        return;
+    }
+
+    tsNode.register({ ...options });
+    tsNodeRegistered = true;
+};
+
+export const validate = async () => {
+    registerTsNode();
+
+    const workflowFilesPaths = getWorkflowsPaths();
+    log(
+        "Detected following workflow files:\n",
+        workflowFilesPaths.map(item => `-> ${relativePath(item)}`).join("\n")
+    );
+
+    const invalidFiles = [];
+    for (let i = 0; i < workflowFilesPaths.length; i++) {
+        const tsWorkflowPath = workflowFilesPaths[i];
+        const exportedWorkflows = await import(tsWorkflowPath);
+        for (const name in exportedWorkflows) {
+            const yamlWorkflowPath = path.join(".github", "workflows", `${name}.yml`);
+
+            const yaml = [
+                TOP_YAML_WORKFLOW_COMMENT,
+                jsYaml.dump(exportedWorkflows[name], { noRefs: true })
+            ].join("\n");
+
+            const existingYaml = fs.readFileSync(yamlWorkflowPath, "utf8");
+
+            if (yaml !== existingYaml) {
+                invalidFiles.push({
+                    name,
+                    tsWorkflowPath,
+                    yamlWorkflowPath
+                });
+            }
+        }
+    }
+
+    if (invalidFiles.length === 0) {
+        console.log("All files are valid.");
+        return;
+    }
+
+    console.log("The following files are not valid:");
+    for (let i = 0; i < invalidFiles.length; i++) {
+        const { name, tsWorkflowPath, yamlWorkflowPath } = invalidFiles[i];
+        console.log(`‣ ${relativePath(tsWorkflowPath)} -> ${relativePath(yamlWorkflowPath)}`);
+        console.log(`   ${name} is not in sync with ${relativePath(yamlWorkflowPath)}`);
+    }
+
+    console.log("\nPlease run `ghawac build` to fix the above issues.");
+
+    process.exit(1);
+};