From fb2a0b9998a599f9e8a9a1e911fd43345778f6ef Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Sun, 28 Feb 2021 14:41:58 -0500
Subject: :split-swap

---
 base.h    |  6 ++++++
 command.c |  3 +++
 command.h |  8 ++++++--
 main.c    |  1 -
 node.c    | 19 ++++++++++++++++---
 ted.c     |  8 ++++++++
 ted.cfg   |  1 +
 7 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/base.h b/base.h
index c2cd80d..8994daf 100644
--- a/base.h
+++ b/base.h
@@ -32,6 +32,12 @@
 #include <assert.h>
 #include <uchar.h>
 
+#if !__TINYC__ && __STDC_VERSION__ >= 201112
+#define static_assert_if_possible(cond) _Static_assert(cond, "Static assertion failed");
+#else
+#define static_assert_if_possible(cond)
+#endif
+
 typedef uint8_t  u8;
 typedef uint16_t u16;
 typedef uint32_t u32;
diff --git a/command.c b/command.c
index 5d98922..05f7c48 100644
--- a/command.c
+++ b/command.c
@@ -317,5 +317,8 @@ void command_execute(Ted *ted, Command c, i64 argument) {
 	case CMD_SPLIT_JOIN:
 		node_join(ted, node);
 		break;
+	case CMD_SPLIT_SWAP:
+		node_split_swap(ted);
+		break;
 	}
 }
diff --git a/command.h b/command.h
index a8efe35..ad5034c 100644
--- a/command.h
+++ b/command.h
@@ -75,7 +75,8 @@ ENUM_U16 {
 	CMD_SPLIT_HORIZONTAL,
 	CMD_SPLIT_VERTICAL,
 	CMD_SPLIT_JOIN,
-	
+	CMD_SPLIT_SWAP, // go to the other side of a split
+
 	CMD_ESCAPE, // by default this is the escape key. closes menus, etc.
 
 	CMD_COUNT
@@ -85,7 +86,7 @@ typedef struct {
 	char const *name;
 	Command cmd;
 } CommandName;
-static CommandName const command_names[CMD_COUNT] = {
+static CommandName const command_names[] = {
 	{"unknown", CMD_UNKNOWN},
 	{"noop", CMD_NOOP},
 	{"left", CMD_LEFT},
@@ -147,6 +148,9 @@ static CommandName const command_names[CMD_COUNT] = {
 	{"split-horizontal", CMD_SPLIT_HORIZONTAL},
 	{"split-vertical", CMD_SPLIT_VERTICAL},
 	{"split-join", CMD_SPLIT_JOIN},
+	{"split-swap", CMD_SPLIT_SWAP},
 	{"escape", CMD_ESCAPE},
 };
 
+static_assert_if_possible(arr_count(command_names) == CMD_COUNT)
+
diff --git a/main.c b/main.c
index 1d4e528..1bf3612 100644
--- a/main.c
+++ b/main.c
@@ -1,5 +1,4 @@
 // @TODO:
-// - :split-swap
 // - fix: ctrl+f something, then switch to another tab (hl rects still showing up)
 
 // - Windows installation
diff --git a/node.c b/node.c
index 1da07ba..3a404cb 100644
--- a/node.c
+++ b/node.c
@@ -137,8 +137,7 @@ static void node_close(Ted *ted, u16 node_idx) {
 			// make sure we don't set the active node to a split
 			while (!new_active_node->tabs)
 				new_active_node = &ted->nodes[new_active_node->split_a];
-			ted->active_node = new_active_node;
-			ted->active_buffer = &ted->buffers[ted->active_node->tabs[ted->active_node->active_tab]];
+			ted_node_switch(ted, new_active_node);
 		}
 	}
 }
@@ -390,7 +389,21 @@ static void node_split(Ted *ted, Node *node, bool vertical) {
 			node->split_vertical = vertical;
 			node->split_pos = 0.5f;
 			if (node == ted->active_node)
-				ted->active_node = &ted->nodes[right_idx];
+				ted_node_switch(ted, &ted->nodes[right_idx]);
+		}
+	}
+}
+
+// swap to the other side of a split
+static void node_split_swap(Ted *ted) {
+	assert(ted->active_node);
+	u16 active_node_idx = (u16)(ted->active_node - ted->nodes);
+	Node *parent = &ted->nodes[node_parent(ted, active_node_idx)];
+	if (parent) {
+		if (parent->split_a == active_node_idx) {
+			ted_node_switch(ted, &ted->nodes[parent->split_b]);
+		} else {
+			ted_node_switch(ted, &ted->nodes[parent->split_a]);
 		}
 	}
 }
diff --git a/ted.c b/ted.c
index fcc1bb1..17f2205 100644
--- a/ted.c
+++ b/ted.c
@@ -130,6 +130,13 @@ static i32 ted_new_node(Ted *ted) {
 	
 }
 
+// switch to this node
+static void ted_node_switch(Ted *ted, Node *node) {
+	ted->active_node = node;
+	assert(node->tabs);
+	ted->active_buffer = &ted->buffers[node->tabs[node->active_tab]];
+}
+
 static bool node_tab_close(Ted *ted, Node *node, u16 index);
 
 // Open a new buffer. Fills out *tab to the index of the tab used, and *buffer_idx to the index of the buffer.
@@ -187,6 +194,7 @@ static void ted_switch_to_buffer(Ted *ted, u16 buffer_idx) {
 	assert(0);
 }
 
+
 // Returns true on success
 static bool ted_open_file(Ted *ted, char const *filename) {
 	// first, check if file is already open
diff --git a/ted.cfg b/ted.cfg
index 1d4e64e..070a419 100644
--- a/ted.cfg
+++ b/ted.cfg
@@ -125,6 +125,7 @@ Ctrl+/ = :split-horizontal
 Ctrl+Shift+/ = :split-vertical
 # unsplit
 Ctrl+j = :split-join
+Ctrl+tab = :split-swap
 
 Escape = :escape
 
-- 
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