From 959b379b90ec95ea0813cc1228cd949872713ec2 Mon Sep 17 00:00:00 2001
From: kdx <kikoodx@paranoici.org>
Date: Wed, 14 Jun 2023 02:38:30 +0200
Subject: function piping

---
 samples/move.golem |  7 ++-----
 src/main.c         | 52 ++++++++++++++++++++++++++++++++++++----------------
 testing.sh         |  2 ++
 3 files changed, 40 insertions(+), 21 deletions(-)

diff --git a/samples/move.golem b/samples/move.golem
index 407b6e1..f29a899 100644
--- a/samples/move.golem
+++ b/samples/move.golem
@@ -6,16 +6,13 @@ define FALSE = 0;
 main() {
 	loop {
 		slp;
-		erase();
-		update();
-		draw();
+		erase() |> update() |> draw();
 	}
 }
 
 
 update() {
-	input_update();
-	player_update();
+	input_update() |> player_update();
 }
 
 
diff --git a/src/main.c b/src/main.c
index 622ced0..8aa98ec 100644
--- a/src/main.c
+++ b/src/main.c
@@ -92,6 +92,8 @@ is_punct(const char *p)
 		return 2;
 	if (strchr("-+", p[0]) != NULL && p[0] == p[1])
 		return 2;
+	if (p[0] == '|' && p[1] == '>')
+		return 2;
 
 	return (strchr("+-/*()<>,;{}[]=&^|", p[0]) != NULL);
 }
@@ -563,6 +565,29 @@ mul(Token **rest, Token *tok)
 	}
 }
 
+static Node *
+fncall(Token **rest, Token *tok)
+{
+	Node *node = new_word(tok);
+	tok = tok->next;
+	node->type = NOD_FNCALL;
+
+	/* args */
+	Node head = {0};
+	Node *cur = &head;
+
+	tok = skip(tok, "(");
+	while (tok->type != TOK_EOF && !equal(tok, ")")) {
+		cur = cur->next = expr(&tok, tok);
+		if (equal(tok, ","))
+			tok = tok->next;
+	}
+	*rest = skip(tok, ")");
+
+	node->rhs = head.next;
+	return node;
+}
+
 static Node *
 primary(Token **rest, Token *tok)
 {
@@ -605,23 +630,13 @@ primary(Token **rest, Token *tok)
 
 	if (tok->type == TOK_WORD && equal(tok->next, "(")) {
 		/* function call */
-		Node *node = new_word(tok);
-		tok = tok->next;
-		node->type = NOD_FNCALL;
-
-		/* args */
-		Node head = {0};
-		Node *cur = &head;
-
-		tok = skip(tok, "(");
-		while (tok->type != TOK_EOF && !equal(tok, ")")) {
-			cur = cur->next = expr(&tok, tok);
-			if (equal(tok, ","))
-				tok = tok->next;
+		Node *node = fncall(&tok, tok);
+		Node *cur = node;
+		while (tok->type != TOK_EOF && equal(tok, "|>")) {
+			tok = tok->next;
+			cur = cur->lhs = fncall(&tok, tok);
 		}
-		*rest = skip(tok, ")");
-
-		node->rhs = head.next;
+		*rest = tok;
 		return node;
 	}
 
@@ -899,6 +914,11 @@ gen_fncall(Node *node)
 
 	printf("\tJRT ,__fn_%.*s\n", node->len, node->loc);
 	depth += 1;
+
+	if (node->lhs != NULL) {
+		depth -= 1;
+		gen_fncall(node->lhs);
+	}
 }
 
 static void
diff --git a/testing.sh b/testing.sh
index 7d35ec0..9781638 100755
--- a/testing.sh
+++ b/testing.sh
@@ -16,6 +16,7 @@ tup -q || ./build.sh || exit 1
 test "$1" "main(){5 + 2; return 4;}"
 test "$1" "main(){6 + 3;}"
 test "$1" "main(){'a' - 'b';}"
+test "$1" "main(){ buzz(); } buzz() { return 42; }"
 test "$1" "main(){ fizz(50 + buzz() - 3) * 4; } fizz() { return 3; } buzz() { return 42; }"
 test "$1" "global abc; main(){ return abc; }"
 test "$1" "global abc = 5; main(){ return abc; }"
@@ -55,4 +56,5 @@ test "$1" "main() return;"
 test "$1" "main() { local a; a = 5; dbg a; a++; dbg a; }"
 test "$1" "main() { local a; a = 5; dbg a; a--; dbg a; }"
 test "$1" "main() { wrt [\"(\"]; wrt '\n'; }"
+test "$1" "main() { wrt inc('0') |> dec() |> inc() |> inc(); wrt '\n'; } inc(a) return a + 1; dec(a) return a - 1;"
 rm -f build/tmp.*
-- 
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