Followed symlinks

Author: cartant

lib/Host.js

@@ -3,16 +3,13 @@
 var commondir = require('commondir');
 var events    = require('events');
 var fs        = require('fs');
+var realpath  = require('fs.realpath')
 var log       = require('util').debuglog(require('../package').name);
 var os        = require('os');
 var path      = require('path');
 var util      = require('util');
 
 module.exports = function (ts) {
-	function replaceFileExtension(file, extension) {
-		return file.replace(/\.\w+$/i, extension);
-	}
-
 	function Host(currentDirectory, outputDirectory, languageVersion) {
 		this.currentDirectory = this.getCanonicalFileName(path.resolve(currentDirectory));
 		this.outputDirectory = this.getCanonicalFileName(path.resolve(outputDirectory));
@@ -49,7 +46,7 @@ module.exports = function (ts) {
 				filename
 			)
 		));
-		var canonical = this._currentCanonical(filename);
+		var canonical = this._canonical(filename);
 		log('Parsing %s', canonical);
 
 		var text;
@@ -94,7 +91,7 @@ module.exports = function (ts) {
 		if (filename === '__lib.d.ts') {
 			return this.libDefault;
 		}
-		var canonical = this._currentCanonical(filename);
+		var canonical = this._canonical(filename);
 		if (this.files[canonical]) {
 			return this.files[canonical].ts;
 		}
@@ -108,9 +105,19 @@ module.exports = function (ts) {
 	};
 
 	Host.prototype.writeFile = function (filename, data) {
-		var canonical = this._currentCanonical(filename);
-		log('Cache write %s', canonical);
-		this.output[canonical] = data;
+
+		var outputCanonical = this._canonical(filename);
+		log('Cache write %s', outputCanonical);
+		this.output[outputCanonical] = data;
+
+		var sourceCanonical = this._inferSourceCanonical(outputCanonical);
+		var sourceFollowed = this._follow(path.dirname(sourceCanonical)) + '/' + path.basename(sourceCanonical);
+
+		if (sourceFollowed !== sourceCanonical) {
+			outputCanonical = this._inferOutputCanonical(sourceFollowed);
+			log('Cache write (followed) %s', outputCanonical);
+			this.output[outputCanonical] = data;
+		}
 	};
 
 	Host.prototype.getCurrentDirectory = function () {
@@ -138,13 +145,6 @@ module.exports = function (ts) {
 		return ts.sys.readFile(filename);
 	};
 
-	Host.prototype._currentCanonical = function (filename) {
-		return this.getCanonicalFileName(path.resolve(
-			this.currentDirectory,
-			filename
-		));
-	}
-
 	Host.prototype._rootDir = function () {
 		var dirs = [];
 		for (var filename in this.files) {
@@ -169,25 +169,70 @@ module.exports = function (ts) {
 		return rootFilenames;
 	}
 
-	Host.prototype._output = function (filename, extension) {
+	Host.prototype._output = function (filename) {
+
+		var outputCanonical = this._inferOutputCanonical(filename);
+		log('Cache read %s', outputCanonical);
+
+		var output = this.output[outputCanonical];
+		if (!output) {
+			log('Cache miss on %s', outputCanonical);
+		}
+		return output;
+	}
+
+	Host.prototype._canonical = function (filename) {
+		return this.getCanonicalFileName(path.resolve(
+			this.currentDirectory,
+			filename
+		));
+	}
+
+	Host.prototype._inferOutputCanonical = function (filename) {
 
-		var inputCanonical = this._currentCanonical(filename);
+		var sourceCanonical = this._canonical(filename);
 		var outputRelative = path.relative(
 			this._rootDir(),
-			replaceFileExtension(inputCanonical, extension)
+			sourceCanonical
 		);
 		var outputCanonical = this.getCanonicalFileName(path.resolve(
 			this.outputDirectory,
 			outputRelative
 		));
-		log('Cache read %s', outputCanonical);
+		return outputCanonical;
+	}
 
-		var output = this.output[outputCanonical];
-		if (!output) {
-			log('Cache miss on %s', outputCanonical);
-		}
-		return output;
+	Host.prototype._inferSourceCanonical = function (filename) {
+
+		var outputCanonical = this._canonical(filename);
+		var outputRelative = path.relative(
+			this.outputDirectory,
+			outputCanonical
+		);
+		var sourceCanonical = this.getCanonicalFileName(path.resolve(
+			this._rootDir(),
+			outputRelative
+		));
+		return sourceCanonical;
 	}
 
+	Host.prototype._follow = function (filename) {
+
+		filename = this._canonical(filename);
+		var parts = [];
+
+		while (!/^(\/|\w:\/|\w:\\)$/i.test(filename)) {
+
+			var stats = fs.lstatSync(filename);
+			if (stats.isSymbolicLink()) {
+				filename = realpath.realpathSync(filename);
+			} else {
+				parts.unshift(path.basename(filename));
+				filename = path.dirname(filename);
+			}
+		}
+		return ts.normalizeSlashes(filename + parts.join('/'));
+	};
+
 	return Host;
 };

lib/Tsifier.js

@@ -34,6 +34,10 @@ module.exports = function (ts) {
 		return (/\.d\.ts$/i).test(file);
 	}
 
+	function replaceFileExtension(file, extension) {
+		return file.replace(/\.\w+$/i, extension);
+	}
+
 	function fileExists(file) {
 		try {
 			var stats = fs.lstatSync(file);
@@ -274,7 +278,7 @@ module.exports = function (ts) {
 	Tsifier.prototype.getCompiledFile = function (inputFile, alreadyMissedCache) {
 		var self = this;
 		var outputExtension = (self.opts.jsx === ts.JsxEmit.Preserve && isTsx(inputFile)) ? '.jsx' : '.js';
-		var output = self.host._output(inputFile, outputExtension);
+		var output = self.host._output(replaceFileExtension(inputFile, outputExtension));
 
 		if (!output) {
 			if (alreadyMissedCache)

package.json

@@ -39,6 +39,7 @@
     "eslint": "^2.7.0",
     "event-stream": "^3.3.1",
     "fs-extra": "^0.28.0",
+    "fs.realpath": "^1.0.0",
     "node-foo": "^0.2.3",
     "semver": "^5.1.0",
     "source-map": "^0.5.3",