build: add tslint rule for consistent file name casing (#14536)

Adds a tslint rule to enforce that the casing on our filenames is consistent. The tslint rule files are excluded, because their names have to be in camel case and end with `Rule`.

tools/BUILD.bazel

@@ -5,7 +5,7 @@ load("@build_bazel_rules_nodejs//:defs.bzl", "nodejs_binary")
 
 ts_library(
   name = "sass_bundle_lib",
-  srcs = ["sass_bundle.ts"],
+  srcs = ["sass-bundle.ts"],
   deps = [
     "@matdeps//@types/node",
     "@matdeps//scss-bundle",
@@ -21,5 +21,5 @@ nodejs_binary(
    "@matdeps//source-map-support",
     ":sass_bundle_lib",
   ],
-  entry_point = "angular_material/tools/sass_bundle.js",
+  entry_point = "angular_material/tools/sass-bundle.js",
 )

tools/gulp/tasks/aot.ts

@@ -1,5 +1,5 @@
 import {task} from 'gulp';
-import {execNodeTask} from '../util/task_helpers';
+import {execNodeTask} from '../util/task-helpers';
 import {join} from 'path';
 import {buildConfig, sequenceTask} from 'material2-build-tools';
 

tools/gulp/tasks/clean.ts

@@ -1,5 +1,5 @@
 import {task} from 'gulp';
-import {cleanTask} from '../util/task_helpers';
+import {cleanTask} from '../util/task-helpers';
 import {buildConfig} from 'material2-build-tools';
 
 

tools/gulp/tasks/development.ts

@@ -1,5 +1,5 @@
 import {task, dest} from 'gulp';
-import {tsBuildTask, copyTask, serverTask} from '../util/task_helpers';
+import {tsBuildTask, copyTask, serverTask} from '../util/task-helpers';
 import {join} from 'path';
 import {
   buildConfig,

tools/gulp/tasks/e2e.ts

@@ -7,7 +7,7 @@ import {
   getActiveBrowserSyncInstance,
   ngcBuildTask,
   serverTask
-} from '../util/task_helpers';
+} from '../util/task-helpers';
 
 const {outputDir, packagesDir, projectDir} = buildConfig;
 

tools/gulp/tasks/lint.ts

@@ -3,7 +3,7 @@ import {readdirSync, readFileSync, statSync} from 'fs';
 import {task} from 'gulp';
 import {IMinimatch, Minimatch} from 'minimatch';
 import {join} from 'path';
-import {execNodeTask} from '../util/task_helpers';
+import {execNodeTask} from '../util/task-helpers';
 
 /** Glob that matches all SCSS or CSS files that should be linted. */
 const styleGlob = 'src/**/*.+(css|scss)';

tools/gulp/tasks/publish/publish-task.ts

@@ -5,7 +5,7 @@ import {task} from 'gulp';
 import {buildConfig, sequenceTask} from 'material2-build-tools';
 import * as minimist from 'minimist';
 import {join} from 'path';
-import {execTask} from '../../util/task_helpers';
+import {execTask} from '../../util/task-helpers';
 
 /** Packages that will be published to NPM by the release task. */
 export const releasePackages = [

tools/gulp/tasks/universal.ts

@@ -1,5 +1,5 @@
 import {dest, task} from 'gulp';
-import {ngcBuildTask, tsBuildTask, copyTask, execTask} from '../util/task_helpers';
+import {ngcBuildTask, tsBuildTask, copyTask, execTask} from '../util/task-helpers';
 import {join} from 'path';
 import {copySync} from 'fs-extra';
 import {buildConfig, buildScssPipeline, sequenceTask} from 'material2-build-tools';

tools/gulp/util/watch-files-reload.ts

@@ -1,5 +1,5 @@
 import {watchFiles} from 'material2-build-tools';
-import {getActiveBrowserSyncInstance} from './task_helpers';
+import {getActiveBrowserSyncInstance} from './task-helpers';
 
 /**
  * Function that watches a set of file globs and runs the specified tasks if a file

tools/tslint-rules/fileNameCasingScopedRule.ts

@@ -0,0 +1,49 @@
+import * as path from 'path';
+import * as ts from 'typescript';
+import * as Lint from 'tslint';
+import * as minimatch from 'minimatch';
+
+/**
+ * Rule that enforces consistent file name casing across files. This a simplified version of the
+ * `file-casing-rule` from tslint which adds the ability to ignore certain files.
+ * TODO(crisbeto): we may be able to replace this rule with once the following changes are released:
+ * https://github.com/palantir/tslint/pull/4206
+ */
+export class Rule extends Lint.Rules.AbstractRule {
+  apply(sourceFile: ts.SourceFile) {
+    return this.applyWithWalker(new Walker(sourceFile, this.getOptions()));
+  }
+}
+
+class Walker extends Lint.RuleWalker {
+  /** Whether the current file should be checked. */
+  private _enabled: boolean;
+
+  constructor(sourceFile: ts.SourceFile, options: Lint.IOptions) {
+    super(sourceFile, options);
+
+    const ignorePattern = options.ruleArguments;
+    const relativeFilePath = path.relative(process.cwd(), sourceFile.fileName);
+
+    this._enabled = ignorePattern.every(p => !minimatch(relativeFilePath, p));
+  }
+
+  visitSourceFile(sourceFile: ts.SourceFile) {
+    if (!this._enabled) {
+      return;
+    }
+
+    const fileName = path.basename(sourceFile.fileName);
+
+    for (let i = 0; i < fileName.length; i++) {
+      const character = fileName[i];
+
+      // Ensure that the current character is an allowed separator and is in lower case.
+      if (character === '_' || character !== character.toLowerCase()) {
+        this.addFailureAt(0, 0, 'File name must be in kebab-case.');
+      }
+    }
+
+    super.visitSourceFile(sourceFile);
+  }
+}

tslint.json

@@ -129,6 +129,11 @@
       "./tools/package-tools/rollup-globals.ts",
       "src/+(lib|cdk|material-examples|material-experimental|cdk-experimental)/!(schematics)**/*.ts"
     ],
+    "file-name-casing-scoped": [
+      true,
+      // Exclude lint rule files since they have to always be camel cased and end with `Rule`.
+      "**/*Rule.ts"
+    ],
     "no-unescaped-html-tag": true
   },
   "linterOptions": {