Update README's with update-docs command info.

Co-authored-by: Jonathan Jackson <[email protected]>

Author: Robert Jackson

README.md

@@ -50,6 +50,12 @@ codemod-cli generate fixture <name of codemod> <name of fixture>
 This sets up two new files in `transforms/<name of codemod>/__testfixtures__/` using the fixture name
 you provided. These fixtures are used by the testing harness to verify that your codemod is working properly.
 
+Once you have things just how you like them with your new codemod (and your tests are passing :wink:) you
+can update your project's README and your transforms README via:
+
+```
+codemod-cli update-docs
+```
 
 Contributing
 ------------------------------------------------------------------------------

commands/global/new.js

@@ -52,6 +52,10 @@ module.exports.handler = function handler(options) {
       ### Running tests
 
       * \`yarn test\`
+
+      ### Update Documentation
+
+      * \`yarn update-docs\`
     `,
     'utf8'
   );
@@ -62,6 +66,7 @@ module.exports.handler = function handler(options) {
       version: '0.1.0',
       scripts: {
         test: 'codemod-cli test',
+        'update-docs': 'codemod-cli update-docs',
       },
       bin: './bin/cli.js',
       keywords: ['codemod-cli'],

commands/local/update-docs.js

@@ -34,6 +34,12 @@ function updateTransformREADME(transformName) {
 
   let fixtureDir = `transforms/${transformName}/__testfixtures__`;
 
+  if (!fs.existsSync(fixtureDir)) {
+    // project does not include fixtures (perhaps using different testing
+    // setup)
+    return;
+  }
+
   fs.readdirSync(fixtureDir)
     .filter(filename => /\.input$/.test(path.basename(filename, path.extname(filename))))
     .forEach(filename => {