Support for reading tsconfig files in directories

Related to palantir#692

src/tslint-cli.ts

@@ -16,6 +16,7 @@
  */
 
 import * as fs from "fs";
+import * as path from "path";
 import * as glob from "glob";
 import * as optimist from "optimist";
 import * as Linter from "./tslint";
@@ -178,20 +179,46 @@ const processFile = (file: string) => {
     }
 };
 
-const GLOB_IGNORE = 'node_modules';
+const GLOB_IGNORE: string[] = ['**/node_modules/**', '**/typings/**'];
 
 const fileArgs: string[] = argv._;
 const files: string[] = fileArgs.reduce((files: string[], arg: string) => {
     return files.concat(glob.sync(arg, {ignore: GLOB_IGNORE}));
 }, []);
 
-files.forEach(file => {
+files.forEach(arg => {
+    const stat = fs.lstatSync(arg);
+
     // Check whether argument is actually a directory
-    const stat = fs.lstatSync(file);
     if (stat.isDirectory()) {
+        let globIgnore = GLOB_IGNORE;
+
+        // Try finding a tsconfig file
+        const configFile = path.join(arg, "/tsconfig.json");
+        let configStat: fs.Stats;
+        try {
+            configStat = fs.lstatSync(configFile);
+        } catch (e) {}
+
+        if (configStat && configStat.isFile()) {
+            let config: any;
+            try {
+                config = JSON.parse(fs.readFileSync(configFile, "utf8"));
+            } catch (e) {
+                // Invalid file contents?
+                console.warn("tsconfig.json file (" + configFile + ") appears not to be valid");
+                console.error(e);
+            }
+            if (config) {
+                if(config.exclude) {
+                    globIgnore = globIgnore.concat(config.exclude);
+                }
+            }
+        }
+
         // Just read all ts files in the directory
-        glob.sync(file + "/**/*.ts", {ignore: GLOB_IGNORE}).forEach(processFile);
+        glob.sync(path.join(arg, "/**/*.ts"), {ignore: globIgnore}).forEach(processFile);
     } else {
-        processFile(file);
+        processFile(arg);
     }
 });