Fix ESC+BKSP.

Noticed this when splitting the screen in tmux.

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.15)
 project(ke C)  # Specify C language explicitly
 
 set(CMAKE_C_STANDARD 99)
-set(KE_VERSION "1.5.4")
+set(KE_VERSION "1.5.6")
 
 set(CMAKE_C_FLAGS "-Wall -Wextra -pedantic -Wshadow -Werror -std=c99 -g")
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_DEFAULT_SOURCE -D_XOPEN_SOURCE")

main.c

@@ -97,6 +97,30 @@ typedef struct erow {
 } erow;
 
 
+typedef enum undo_kind {
+	UNDO_INSERT  = 1 << 0,
+	UNDO_UNKNOWN = 1 << 1,
+} undo_kind;
+
+
+typedef struct undo_node {
+	undo_kind		 op;
+	size_t			 row, col;
+	abuf			 text;
+
+	struct undo_node	*next;
+	struct undo_node	*parent;
+
+} undo_node;
+
+
+typedef struct undo_tree {
+	undo_node	*root;		/* the start of the undo sequence */
+	undo_node	*current;	/* where we are currently at */
+	undo_node	*pending;	/* the current undo operations being built */
+} undo_tree;
+
+
 /*
  * editor is the global editor state; it should be broken out
  * to buffers and screen state, probably.
@@ -2369,6 +2393,8 @@ process_kcommand(int16_t c)
 void
 process_normal(int16_t c)
 {
+	int	 cols = 0;
+	int	 rows = 0;
 	int	 reps = 0;
 
 	/* C-u handling – must be the very first thing */
@@ -2425,6 +2451,12 @@ process_normal(int16_t c)
 	case CTRL_KEY('g'):
 		break;
 	case CTRL_KEY('l'):
+		if (get_winsz(&rows, &cols) == 0) {
+			editor.rows = rows;
+			editor.cols = cols;
+		} else {
+			editor_set_status("Couldn't update window size.");
+		}
 		display_refresh();
 		break;
 	case CTRL_KEY('s'):
@@ -2518,7 +2550,7 @@ process_escape(int16_t c)
 	case BACKSPACE:
 		reps = uarg_get();
 
-		while (--reps) {
+		while (reps--) {
 			delete_prev_word();
 		}
 		break;
@@ -3053,10 +3085,12 @@ install_signal_handlers(void)
 int
 main(int argc, char *argv[])
 {
-	char	*arg;
+	char	*fname  = NULL;
+	char	*lnarg  = NULL;
 	int	 lineno = 0;
 	int	 opt;
 	int	 debug  = 0;
+	int	 jump   = 0;
 
 	install_signal_handlers();
 
@@ -3083,23 +3117,31 @@ main(int argc, char *argv[])
 	init_editor();
 
 	if (argc > 0) {
-		open_file(argv[0]);
+		fname = argv[0];
 	}
 
 	if (argc > 1) {
-		arg = argv[1];
-		if (arg[0] == '+') {
-			arg++;
+		lnarg = argv[0];
+		fname = argv[1];
+		if (lnarg[0] == '+') {
+			lnarg++;
 		}
-		lineno = atoi(arg);
+		lineno = atoi(lnarg);
+		jump = 1;
+	}
+
+	if (fname != NULL) {
+		open_file(fname);
 	}
 
 	editor_set_status("C-k q to exit / C-k d to dump core");
+	if (jump) {
 		if (lineno < 1) {
-		editor_set_status("Invalid line number %s", arg);
+			editor_set_status("Invalid line number %s", lnarg);
 		} else {
 			jump_to_position(0, lineno - 1);
 		}
+	}
 
 	display_clear(NULL);
 	loop();