Chore: Skip unnecessary checks on pre commit (#16946)

* Skip unnecessary checks on pre commit

* Remove grunt precommit task

* Separate go and fe tesrt lint

scripts/cli/tasks/precommit.ts

@@ -0,0 +1,81 @@
+import { Task, TaskRunner } from './task';
+import chalk from 'chalk';
+import get from 'lodash/get';
+import flatten from 'lodash/flatten';
+import execa = require('execa');
+const simpleGit = require('simple-git/promise')(process.cwd());
+
+interface PrecommitOptions {}
+
+const tasks = {
+  lint: {
+    sass: ['newer:sasslint'],
+    core: ['newer:exec:tslintRoot'],
+    gui: ['newer:exec:tslintPackages'],
+  },
+  typecheck: {
+    core: ['newer:exec:typecheckRoot'],
+    gui: ['newer:exec:typecheckPackages'],
+  },
+  test: {
+    lint: {
+      ts: ['no-only-tests'],
+      go: ['no-focus-convey-tests'],
+    },
+  },
+};
+
+const precommitRunner: TaskRunner<PrecommitOptions> = async () => {
+  const status = await simpleGit.status();
+  const sassFiles = status.files.filter(
+    file => (file.path as string).match(/^[a-zA-Z0-9\_\-\/]+(\.scss)$/g) || file.path.indexOf('.sass-lint.yml') > -1
+  );
+
+  const tsFiles = status.files.filter(file => (file.path as string).match(/^[a-zA-Z0-9\_\-\/]+(\.(ts|tsx))$/g));
+  const testFiles = status.files.filter(file => (file.path as string).match(/^[a-zA-Z0-9\_\-\/]+(\.test.(ts|tsx))$/g));
+  const goTestFiles = status.files.filter(file => (file.path as string).match(/^[a-zA-Z0-9\_\-\/]+(\_test.go)$/g));
+  const grafanaUiFiles = tsFiles.filter(file => (file.path as string).indexOf('grafana-ui') > -1);
+
+  const grafanaUIFilesChangedOnly = tsFiles.length > 0 && tsFiles.length - grafanaUiFiles.length === 0;
+  const coreFilesChangedOnly = tsFiles.length > 0 && grafanaUiFiles.length === 0;
+
+  const taskPaths = [];
+
+  if (sassFiles.length > 0) {
+    taskPaths.push('lint.sass');
+  }
+
+  if (testFiles.length) {
+    taskPaths.push('test.lint.ts');
+  }
+
+  if (goTestFiles.length) {
+    taskPaths.push('test.lint.go');
+  }
+
+  if (tsFiles.length > 0) {
+    if (grafanaUIFilesChangedOnly) {
+      taskPaths.push('lint.gui', 'typecheck.core', 'typecheck.gui');
+    } else if (coreFilesChangedOnly) {
+      taskPaths.push('lint.core', 'typecheck.core');
+    } else {
+      taskPaths.push('lint.core', 'lint.gui', 'typecheck.core', 'typecheck.gui');
+    }
+  }
+
+  const gruntTasks = flatten(taskPaths.map(path => get(tasks, path)));
+  if (gruntTasks.length > 0) {
+    console.log(chalk.yellow(`Precommit checks: ${taskPaths.join(', ')}`));
+    const task = execa('grunt', gruntTasks);
+    // @ts-ignore
+    const stream = task.stdout;
+    stream.pipe(process.stdout);
+    return task;
+  }
+  console.log(chalk.yellow('Skipping precommit checks, not front-end changes detected'));
+  return;
+};
+
+export const precommitTask = new Task<PrecommitOptions>();
+precommitTask.setName('Precommit task');
+precommitTask.setRunner(precommitRunner);