another big refactor

src/lib/BuildInfo.hx

@@ -0,0 +1,42 @@
+package lib;
+
+/**
+	Macros with static information.
+**/
+class BuildInfo {
+	/**
+		Get the latest git commit.
+	**/
+	public static macro function getGitCommitHash():haxe.macro.Expr.ExprOf<String> {
+		#if !display
+		var process = new sys.io.Process('git', ['rev-parse', 'HEAD']);
+		if (process.exitCode() != 0) {
+			var message = process.stderr.readAll().toString();
+			var pos = haxe.macro.Context.currentPos();
+			haxe.macro.Context.error("Cannot execute `git rev-parse HEAD`. " + message, pos);
+		}
+
+		// read the output of the process
+		var commitHash:String = process.stdout.readLine();
+
+		// Generates a string expression
+		return macro $v{commitHash};
+		#else
+		// `#if display` is used for code completion. In this case returning an
+		// empty string is good enough; We don't want to call git on every hint.
+		var commitHash:String = "";
+		return macro $v{commitHash};
+		#end
+	}
+
+	/**
+		Get the time the file was build.
+	**/
+	public static macro function buildTime():haxe.macro.Expr.ExprOf<Int> {
+		#if !display
+		return macro $v{Math.floor(Date.now().getTime())};
+		#else
+		return macro $v{0};
+		#end
+	}
+}