allow line-by-line repl mode

kiss/src/kiss/Main.hx

@@ -7,23 +7,54 @@ import kiss.Reader;
 import kiss.Stream;
 
 using tink.MacroApi;
+using StringTools;
 #end
 
 class Main {
-    static macro function macroMain():Expr {
-        var kissInputStream = Stream.fromString(Sys.stdin().readAll().toString());
-        var k = Kiss.defaultKissState();
-        Reader.readAndProcess(kissInputStream, k, (readerExp) -> {
-            Sys.println(Kiss.readerExpToHaxeExpr(readerExp, k).toString());
-        });
-
-        return macro null;
-    }
-
-    // When called from the command-line, `kiss` converts its stdin output to Haxe expressions
-    // TODO write tests for this
-    // TODO use this to implement runAtRuntime() for sys targets by running a haxe subprocess
     static function main() {
         macroMain();
     }
+
+    // When called from the command-line, `kiss` converts its stdin input to Haxe expressions.
+    // with --all, it reads everything from stdin at once (for piping). Without --all, it acts as a repl,
+    // where \ at the end of a line signals that the expression is not complete
+    // TODO write tests for this
+    // TODO use this to implement runAtRuntime() for sys targets by running a haxe subprocess
+    static macro function macroMain():Expr {
+        var k = Kiss.defaultKissState();
+        if (Sys.args().indexOf("--all") != -1) {
+            var kissInputStream = Stream.fromString(Sys.stdin().readAll().toString());
+            Reader.readAndProcess(kissInputStream, k, (readerExp) -> {
+                Sys.println(Kiss.readerExpToHaxeExpr(readerExp, k).toString());
+            });
+        } else {
+            var line = "";
+            try {
+                while (true) {
+                    if (line.length == 0) {
+                        Sys.print(">>> ");
+                    } else {
+                        Sys.print("    ");
+                    }
+
+                    line += Sys.stdin().readLine();
+
+                    if (line.endsWith("\\")) {
+                        line = line.substr(0, line.length - 1);
+                        continue;
+                    }
+
+                    var kissInputStream = Stream.fromString(line);
+                    Reader.readAndProcess(kissInputStream, k, (readerExp) -> {
+                        Sys.println(Kiss.readerExpToHaxeExpr(readerExp, k).toString());
+                    });
+
+                    line = "";
+                }
+            } catch (e:haxe.io.Eof) {}
+        }
+
+        var line = "";
+        return macro null;
+    }
 }