packages/cli: move reading of plugin template data to plugin diff

packages/cli/src/commands/plugin/diff.ts

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+import fs from 'fs-extra';
 import { Command } from 'commander';
 import {
   diffTemplateFiles,
@@ -23,6 +24,13 @@ import {
   makeCheckPromptFunc,
   yesPromptFunc,
 } from '../../lib/diff';
+import { paths } from '../../lib/paths';
+import { version } from '../../lib/version';
+
+export type PluginData = {
+  id: string;
+  name: string;
+};
 
 const fileHandlers = [
   {
@@ -54,7 +62,36 @@ export default async (cmd: Command) => {
     promptFunc = yesPromptFunc;
   }
 
-  const templateFiles = await diffTemplateFiles('default-plugin');
+  const data = await readPluginData();
+  const templateFiles = await diffTemplateFiles('default-plugin', {
+    version,
+    ...data,
+  });
   await handleAllFiles(fileHandlers, templateFiles, promptFunc);
   await finalize();
 };
+
+// Reads templating data from the existing plugin
+async function readPluginData(): Promise<PluginData> {
+  let name: string;
+  try {
+    const pkg = require(paths.resolveTarget('package.json'));
+    name = pkg.name;
+  } catch (error) {
+    throw new Error(`Failed to read target package, ${error}`);
+  }
+
+  const pluginTsContents = await fs.readFile(
+    paths.resolveTarget('src/plugin.ts'),
+    'utf8',
+  );
+  // TODO: replace with some proper parsing logic or plugin metadata file
+  const pluginIdMatch = pluginTsContents.match(/id: ['"`](.+?)['"`]/);
+  if (!pluginIdMatch) {
+    throw new Error(`Failed to parse plugin.ts, no plugin ID found`);
+  }
+
+  const id = pluginIdMatch[1];
+
+  return { id, name };
+}

packages/cli/src/lib/diff/read.ts

@@ -23,44 +23,13 @@ import {
 import handlebars from 'handlebars';
 import recursiveReadDir from 'recursive-readdir';
 import { paths } from '../paths';
-import { version } from '../version';
 import { FileDiff } from './types';
 
-export type PluginInfo = {
-  id: string;
-  name: string;
-};
-
 export type TemplatedFile = {
   path: string;
   contents: string;
 };
 
-// Reads info from the existing plugin
-async function readPluginInfo(): Promise<PluginInfo> {
-  let name: string;
-  try {
-    const pkg = require(paths.resolveTarget('package.json'));
-    name = pkg.name;
-  } catch (error) {
-    throw new Error(`Failed to read target package, ${error}`);
-  }
-
-  const pluginTsContents = await fs.readFile(
-    paths.resolveTarget('src/plugin.ts'),
-    'utf8',
-  );
-  // TODO: replace with some proper parsing logic or plugin metadata file
-  const pluginIdMatch = pluginTsContents.match(/id: ['"`](.+?)['"`]/);
-  if (!pluginIdMatch) {
-    throw new Error(`Failed to parse plugin.ts, no plugin ID found`);
-  }
-
-  const id = pluginIdMatch[1];
-
-  return { id, name };
-}
-
 async function readTemplateFile(
   templateFile: string,
   templateVars: any,
@@ -131,13 +100,10 @@ async function diffTemplatedFiles(
 }
 
 // Read all template files for a given template, along with all matching files in the target dir
-export async function diffTemplateFiles(template: string) {
-  const pluginInfo = await readPluginInfo();
-  const templateVars = { version, ...pluginInfo };
-
+export async function diffTemplateFiles(template: string, templateData: any) {
   const templateDir = paths.resolveOwn('templates', template);
 
-  const templatedFiles = await readTemplate(templateDir, templateVars);
+  const templatedFiles = await readTemplate(templateDir, templateData);
   const fileDiffs = await diffTemplatedFiles(paths.targetDir, templatedFiles);
   return fileDiffs;
 }