frontend: compile: print ast nodes as they are passed to the code generator

when both -a and -i switches are specified, ast nodes will be printed as they
are passed to the code generator, rather than all at once /before/ code
generation.

this makes it easier to determine which ast node is causing a code generation
error.

frontend/cmd/compile.c

@@ -17,10 +17,14 @@ enum {
 	ARG_SOURCE_FILE = 200,
 	OPT_SHOW_LEX_TOKENS,
 	OPT_SHOW_AST_NODES,
-	OPT_SHOW_AST_NODES_POST,
 	OPT_SHOW_IR,
 };
 
+struct codegen_args {
+	struct ivy_codegen *args_gen;
+	bool args_print_ast;
+};
+
 static enum ivy_status node_codegen(
 	struct ivy_ast_node *node, enum ivy_ast_iteration_type iteration_type,
 	struct ivy_ast_node_iterator *it, void *arg)
@@ -29,9 +33,12 @@ static enum ivy_status node_codegen(
 		return IVY_OK;
 	}
 
-	struct ivy_codegen *gen = arg;
+	struct codegen_args *args = arg;
-	struct print_ast_node_args print_args = {.postorder = true};
+	struct ivy_codegen *gen = args->args_gen;
-	print_ast_node(node, iteration_type, it, &print_args);
+	if (args->args_print_ast) {
+		print_ast_node(node, iteration_type, it, NULL);
+	}
+
 	return ivy_codegen_push_node(gen, node, node->n_it.it_depth);
 }
 
@@ -43,10 +50,6 @@ static int compile_file(const char *path, const b_arglist *args)
 	bool show_ast = b_arglist_get_count(
 				args, OPT_SHOW_AST_NODES, B_COMMAND_INVALID_ID)
 	              > 0;
-	bool show_ast_post
-		= b_arglist_get_count(
-			  args, OPT_SHOW_AST_NODES_POST, B_COMMAND_INVALID_ID)
-	        > 0;
 	bool show_ir
 		= b_arglist_get_count(args, OPT_SHOW_IR, B_COMMAND_INVALID_ID) > 0;
 
@@ -128,31 +131,17 @@ static int compile_file(const char *path, const b_arglist *args)
 		return r;
 	}
 
-	if (show_ast) {
-		struct ivy_ast_node *root = ivy_parser_root_node(parser);
-		struct ivy_ast_node_iterator it = {0};
-		ivy_ast_node_iterate(root, &it, print_ast_node, NULL);
-	}
-
-	if (show_ast && show_ast_post) {
-		printf("------\n");
-	}
-
-	if (show_ast_post) {
-		struct ivy_ast_node *root = ivy_parser_root_node(parser);
-		struct ivy_ast_node_iterator it = {};
-		struct print_ast_node_args args = {
-			.indent = true,
-			.postorder = true,
-		};
-		ivy_ast_node_iterate(root, &it, print_ast_node, &args);
-	}
-
 	if (r != 0) {
 		ivy_parser_destroy(parser, NULL);
 		return r;
 	}
 
+	if (show_ast && !show_ir) {
+		struct ivy_ast_node *root = ivy_parser_root_node(parser);
+		struct ivy_ast_node_iterator it = {0};
+		ivy_ast_node_iterate(root, &it, print_ast_node, NULL);
+	}
+
 	if (!show_ir) {
 		ivy_parser_destroy(parser, NULL);
 		return 0;
@@ -162,9 +151,15 @@ static int compile_file(const char *path, const b_arglist *args)
 
 	struct ivy_ast_node *node = ivy_parser_root_node(parser);
 	struct ivy_ast_node_iterator it = {0};
-	status = ivy_ast_node_iterate(node, &it, node_codegen, codegen);
+	struct codegen_args gen_args = {
+		.args_gen = codegen,
+		.args_print_ast = show_ast,
+	};
+
+	status = ivy_ast_node_iterate(node, &it, node_codegen, &gen_args);
 	if (status != IVY_OK) {
 		printf("codegen failed: error %s\n", ivy_status_to_string(status));
+		return -1;
 	}
 
 	ivy_codegen_push_eof(codegen);
@@ -234,15 +229,6 @@ B_COMMAND(CMD_COMPILE, CMD_ROOT)
 			"input files.");
 	}
 
-	B_COMMAND_OPTION(OPT_SHOW_AST_NODES_POST)
-	{
-		B_OPTION_LONG_NAME("show-ast-post");
-		B_OPTION_SHORT_NAME('A');
-		B_OPTION_DESC(
-			"print the abstract syntax tree generated from the "
-			"input files in post-order.");
-	}
-
 	B_COMMAND_OPTION(OPT_SHOW_IR)
 	{
 		B_OPTION_LONG_NAME("show-ir");