refactor(@angular/cli): Updates .gitignore to keep out VSCode and Intellij configurations.

This also changes the local build script to allow negated .gitignore expressions to support these changes.

Author: dgp1130

.gitignore

@@ -5,9 +5,27 @@ dist/
 dist-schema/
 
 # IDEs
-.idea/
 jsconfig.json
+
+# Intellij IDEA/WebStorm
+# https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Also ignore code styles because .editorconfig is used instead.
+.idea/codeStyles/
+
+# VSCode
+# https://github.com/github/gitignore/blob/master/Global/VisualStudioCode.gitignore
 .vscode/
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+**/*.code-workspace
 
 # Typings file.
 typings/

scripts/build.ts

@@ -17,15 +17,23 @@ import buildSchema from './build-schema';
 const minimatch = require('minimatch');
 const tar = require('tar');
 
-const gitIgnore = fs.readFileSync(path.join(__dirname, '../.gitignore'), 'utf-8')
-  .split('\n')
+const gitIgnoreFiles = fs.readFileSync(path.join(__dirname, '../.gitignore'), 'utf-8')
+  .split('\n');
+const gitIgnore = gitIgnoreFiles
   .map(line => line.replace(/#.*/, ''))
+  .filter((line) => !line.startsWith('!'))
   .filter(line => !line.match(/^\s*$/));
+const gitIgnoreExcept = gitIgnoreFiles
+  .filter((line) => line.startsWith('!'))
+  .map((line) => line.substr(1));
 
-
-function _gitIgnoreMatch(p: string) {
+function _gitIgnoreMatch(p: string): boolean {
   p = path.relative(path.dirname(__dirname), p);
 
+  if (gitIgnoreExcept.some((line) => minimatch(p, line))) {
+    return false;
+  }
+
   return gitIgnore.some(line => minimatch(p, line));
 }