[hx rc] install/select Haxe version specified by .haxerc

src/HaxeDownload.hx

@@ -53,34 +53,35 @@ class HaxeDownload {
 		installFile(dest, filename, alias);
 	}
 
-	static function downloadLatest(?alias:String = "dev"):Void {
+	static function downloadLatest(?alias:String = "dev", ?cb:String->Void):Void {
 		final url = Utils.getBuildUrl("latest");
-		install(url[0], url[1], alias);
+		install(url[0], url[1], alias, cb);
 	}
 
-	static function downloadNightly(v:String, ?alias:String):Void {
+	public static function downloadNightly(v:String, ?alias:String, ?cb:String->Void):Void {
 		v = HaxeNightlies.resolve(v);
 		final url = Utils.getBuildUrl(v);
-		install(url[0], url[1], alias);
+		install(url[0], url[1], alias, cb);
 	}
 
-	static function downloadRelease(v:String, ?alias:String):Void {
+	public static function downloadRelease(v:String, ?alias:String, ?cb:String->Void):Void {
 		final url = Utils.getReleaseUrl(v);
-		install(url[0], url[1], alias);
+		install(url[0], url[1], alias, cb);
 	}
 
-	static function install(url:String, filename:String, ?alias:String):Void {
+	static function install(url:String, filename:String, ?alias:String, ?cb:String->Void):Void {
 		url = url + filename;
 		filename = Path.withoutDirectory(filename);
 		final path = Path.join([Utils.releasesDir, filename]);
 
 		DownloadHelper.download(url, path, () -> {
 			Sys.println('Downloaded $filename');
-			installFile(path, filename, alias);
+			alias = installFile(path, filename, alias);
+			if (cb != null) cb(alias);
 		});
 	}
 
-	static function installFile(path:String, filename:String, ?alias:String):Void {
+	static function installFile(path:String, filename:String, ?alias:String):String {
 		final out = DownloadHelper.extract(path);
 		FileSystem.deleteFile(path);
 
@@ -91,6 +92,7 @@ class HaxeDownload {
 		try FileSystem.deleteFile(versionPath) catch(_) {}
 		FileSync.symlink(releasePath, versionPath);
 		Sys.println('Installed $filename as $alias');
+		return alias;
 	}
 
 	public static function displayUsage() {

src/HaxeManager.hx

@@ -13,6 +13,7 @@ class HaxeManager {
 			case [null, _]: HaxeSelect.fzf();
 			case ["download", args]: HaxeDownload.run(args);
 			case ["select", args]: HaxeSelect.run(args);
+			case ["rc", _]: HaxeRc.resolve();
 
 			case ["install", [file]]: HaxeDownload.installLocal(file);
 			case ["install", [file, alias]]: HaxeDownload.installLocal(file, alias);
@@ -91,6 +92,9 @@ class HaxeManager {
 		}
 
 		lines = lines.concat([
+			'   or: ${ORANGE}hx rc${RESET}',
+			'       Install and select Haxe version specified by .haxerc file',
+			'',
 			'   or: ${ORANGE}hx list${RESET}',
 			'       Display all installed Haxe versions',
 			'',

src/HaxeRc.hx

@@ -0,0 +1,39 @@
+import haxelib.SemVer;
+import sys.io.File;
+import haxe.Json;
+import sys.FileSystem;
+import haxe.io.Path;
+
+import tools.Utils;
+
+class HaxeRc {
+	public static function resolve() {
+		final cwd = Utils.getCallSite();
+
+		// TODO (?): check parent directories too
+		final rc = Path.join([cwd, ".haxerc"]);
+
+		if (FileSystem.exists(rc)) {
+			try {
+				final version = Json.parse(File.getContent(rc)).version;
+
+				if (SemVer.isValid(version)) {
+					HaxeDownload.downloadRelease(version, r -> HaxeSelect.select(r));
+				} else if (HaxeNightlies.isValid(version)) {
+					switch (Utils.resolveRelease(version)) {
+						case null:
+							HaxeDownload.downloadNightly(version, r -> HaxeSelect.select(r));
+						case r:
+							HaxeSelect.select(r);
+					}
+				}
+			} catch (e) {
+				Utils.displayError('Could not get Haxe version from .haxerc: $e');
+				Sys.exit(1);
+			}
+		} else {
+			Utils.displayError('Did not find any .haxerc to apply');
+			Sys.exit(1);
+		}
+	}
+}

src/tools/Utils.hx

@@ -127,6 +127,14 @@ class Utils {
 		link(dir);
 	}
 
+	public static function resolveRelease(ref:String):Null<String> {
+		for (r in FileSystem.readDirectory(releasesDir)) {
+			if (StringTools.endsWith(r, '_$ref')) return r;
+		}
+
+		return null;
+	}
+
 	public static function selectRelease(r:String):Void {
 		final dir = Path.join([releasesDir, r]);
 		if (!FileSystem.exists(dir)) throw 'Version $r is not installed';