From 31b5649b131695300f39563640c4af8f0d3032cb Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Thu, 28 Jan 2021 20:40:52 -0500
Subject: more tabs

---
 main.c     |  3 ++-
 ted-base.c | 18 ++++++++++++------
 ted.h      |  3 +++
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/main.c b/main.c
index 8248ac3..686a515 100644
--- a/main.c
+++ b/main.c
@@ -464,7 +464,8 @@ int main(int argc, char **argv) {
 
 		{
 			float x1 = 50, y1 = 50, x2 = window_width-50, y2 = window_height-50;
-			buffer_render(&ted->buffers[ted->active_node->tabs[0]], x1, y1, x2, y2);
+			Node *node = ted->active_node;
+			buffer_render(&ted->buffers[node->tabs[node->active_tab]], x1, y1, x2, y2);
 			if (text_has_err()) {
 				ted_seterr(ted, "Couldn't render text: %s", text_get_err());
 			}
diff --git a/ted-base.c b/ted-base.c
index a9cf725..371096f 100644
--- a/ted-base.c
+++ b/ted-base.c
@@ -95,6 +95,7 @@ static i32 ted_new_buffer(Ted *ted) {
 	for (i32 i = 0; i < TED_MAX_BUFFERS; ++i) {
 		if (!buffers_used[i]) {
 			buffers_used[i] = true;
+			buffer_create(&ted->buffers[i], ted);
 			return i;
 		}
 	}
@@ -125,14 +126,19 @@ static WarnUnusedResult TextBuffer *ted_open_file(Ted *ted, char const *filename
 		ted_seterr(ted, "Too many buffers open!");
 		return NULL;
 	} else {
-		arr_add(ted->active_node->tabs, (u16)new_buffer_index);
-		TextBuffer *new_buffer = &ted->buffers[new_buffer_index];
-		if (buffer_load_file(new_buffer, filename)) {
-			ted->active_buffer = new_buffer;
-			return new_buffer;
+		Node *node = ted->active_node;
+		if (arr_len(node->tabs) < TED_MAX_TABS) {
+			arr_add(node->tabs, (u16)new_buffer_index);
+			TextBuffer *new_buffer = &ted->buffers[new_buffer_index];
+			if (node->tabs && buffer_load_file(new_buffer, filename)) {
+				ted->active_buffer = new_buffer;
+				node->active_tab = (u16)(arr_len(node->tabs) - 1);
+				return new_buffer;
+			}
 		} else {
-			return NULL;
+			ted_seterr(ted, "Too many tabs.");
 		}
+		return NULL;
 	}
 }
 
diff --git a/ted.h b/ted.h
index 58b5324..9228d00 100644
--- a/ted.h
+++ b/ted.h
@@ -103,12 +103,15 @@ typedef struct {
 // a node is a collection of tabs OR a split of two nodes
 typedef struct Node {
 	u16 *tabs; // dynamic array of indices into ted->buffers, or NULL if this is a split
+	u16 active_tab;
 	u16 left; // index into ted->nodes
 	u16 right;
 } Node;
 
 #define TED_MAX_BUFFERS 256
 #define TED_MAX_NODES 256
+// max tabs per node
+#define TED_MAX_TABS 100
 typedef struct Ted {
 	Font *font_bold;
 	Font *font;
-- 
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