[dev/precommitHook] add support for --fix flag (#36717)

* [dev/precommitHook] add support for --fix flag

* describe new --fix flag in precommit error text

package.json

@@ -56,7 +56,6 @@
     "start": "node --trace-warnings --trace-deprecation scripts/kibana --dev ",
     "debug": "node --nolazy --inspect scripts/kibana --dev",
     "debug-break": "node --nolazy --inspect-brk scripts/kibana --dev",
-    "precommit": "node scripts/precommit_hook",
     "karma": "karma start",
     "lint": "yarn run lint:es && yarn run lint:sass",
     "lint:es": "node scripts/eslint",

src/dev/eslint/lint_files.js

@@ -30,15 +30,20 @@ import { REPO_ROOT } from '../constants';
  * @param  {Array<File>} files
  * @return {undefined}
  */
-export function lintFiles(log, files) {
+export function lintFiles(log, files, { fix } = {}) {
   const cli = new CLIEngine({
     cache: true,
     cwd: REPO_ROOT,
+    fix
   });
 
   const paths = files.map(file => file.getRelativePath());
   const report = cli.executeOnFiles(paths);
 
+  if (fix) {
+    CLIEngine.outputFixes(report);
+  }
+
   const failTypes = [];
   if (report.errorCount > 0) failTypes.push('errors');
   if (report.warningCount > 0) failTypes.push('warning');

src/dev/register_git_hook/register_git_hook.js

@@ -48,58 +48,58 @@ function getKbnPrecommitGitHookScript(rootPath, nodeHome, platform) {
   #
   # ** THIS IS AN AUTO-GENERATED FILE **
   # ** PLEASE DO NOT CHANGE IT MANUALLY **
-  # 
+  #
   # GENERATED BY ${__dirname}
   # IF YOU WANNA CHANGE SOMETHING INTO THIS SCRIPT
   # PLEASE RE-RUN 'yarn kbn bootstrap' or 'node scripts/register_git_hook' IN THE ROOT
   # OF THE CURRENT PROJECT ${rootPath}
-  
+
   set -euo pipefail
-  
+
   # Export Git hook params
   export GIT_PARAMS="$*"
-  
+
   has_node() {
     command -v node >/dev/null 2>&1
   }
-  
+
   has_nvm() {
     command -v nvm >/dev/null 2>&1
   }
-  
+
   try_load_node_from_nvm_paths () {
     # If nvm is not loaded, load it
     has_node || {
       NVM_SH="${nodeHome}/.nvm/nvm.sh"
-      
+
       if [ "${platform}" == "darwin" ] && [ -s "$(brew --prefix nvm)/nvm.sh" ]; then
         NVM_SH="$(brew --prefix nvm)/nvm.sh"
       fi
-      
+
       export NVM_DIR=${nodeHome}/.nvm
-      
+
       [ -s "$NVM_SH" ] && \. "$NVM_SH"
-      
+
       # If nvm has been loaded correctly, use project .nvmrc
       has_nvm && nvm use
     }
   }
-  
+
   extend_user_path() {
     if [ "${platform}" == "win32" ]; then
       export PATH="$PATH:/c/Program Files/nodejs"
-    else 
+    else
       export PATH="$PATH:/usr/local/bin:/usr/local"
       try_load_node_from_nvm_paths
     fi
   }
-  
+
   # Extend path with common path locations for node
   # in order to make the hook working on git GUI apps
   extend_user_path
-  
+
   # Check if we have node js bin in path
-  has_node || { 
+  has_node || {
     echo "Can't found node bin in the PATH. Please update the PATH to proceed."
     echo "If your PATH already has the node bin, maybe you are using some git GUI app."
     echo "Can't found node bin in the PATH. Please update the PATH to proceed."
@@ -107,12 +107,16 @@ function getKbnPrecommitGitHookScript(rootPath, nodeHome, platform) {
     echo "In order to proceed, you need to config the PATH used by the application that are launching your git GUI app."
     echo "If you are running macOS, you can do that using:"
     echo "'sudo launchctl config user path /usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin'"
-     
+
     exit 1
   }
-  
-  npm run --silent precommit || { echo "Pre-commit hook failed (add --no-verify to bypass)"; exit 1; }
-  
+
+  node scripts/precommit_hook || {
+    echo "Pre-commit hook failed (add --no-verify to bypass)";
+    echo '  For eslint failures you can try running \`node scripts/precommit_hook --fix\`';
+    exit 1;
+  }
+
   exit 0
   `);
 }

src/dev/run_precommit_hook.js

@@ -22,7 +22,7 @@ import * as Eslint from './eslint';
 import * as Sasslint from './sasslint';
 import { getFilesForCommit, checkFileCasing } from './precommit_hook';
 
-run(async ({ log }) => {
+run(async ({ log, flags }) => {
   const files = await getFilesForCommit();
   const errors = [];
 
@@ -36,7 +36,9 @@ run(async ({ log }) => {
     const filesToLint = Linter.pickFilesToLint(log, files);
     if (filesToLint.length > 0) {
       try {
-        await Linter.lintFiles(log, filesToLint);
+        await Linter.lintFiles(log, filesToLint, {
+          fix: flags.fix
+        });
       } catch (error) {
         errors.push(error);
       }
@@ -46,4 +48,17 @@ run(async ({ log }) => {
   if (errors.length) {
     throw combineErrors(errors);
   }
+}, {
+  description: `
+    Run checks on files that are staged for commit
+  `,
+  flags: {
+    boolean: ['fix'],
+    default: {
+      fix: false
+    },
+    help: `
+      --fix              Execute eslint in --fix mode
+    `
+  },
 });