From 35cb8b8cfbd141d4ba2e3f1435a9550864d9e2e1 Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Sat, 2 Jan 2021 18:25:03 -0500
Subject: blinking cursor

---
 buffer.c | 22 +++++++++++++++++-----
 config.c | 41 ++++++++++++++++++++++++++++-------------
 main.c   |  3 +--
 ted.cfg  |  5 +++++
 4 files changed, 51 insertions(+), 20 deletions(-)

diff --git a/buffer.c b/buffer.c
index 0e13ee5..8ad3733 100644
--- a/buffer.c
+++ b/buffer.c
@@ -1774,11 +1774,23 @@ void buffer_render(TextBuffer *buffer, float x1, float y1, float x2, float y2) {
 	text_chars_end(font);
 
 	{ // render cursor
-		if (buffer_clip_rect(buffer, &cursor_rect)) {
-			gl_color_rgba(colors[COLOR_CURSOR]);
-			glBegin(GL_QUADS);
-			rect_render(cursor_rect);
-			glEnd();
+		float time_on = settings->cursor_blink_time_on;
+		float time_off = settings->cursor_blink_time_off;
+		bool is_on = true;
+		if (time_off > 0) {
+			double absolute_time = time_get_seconds();
+			float period = time_on + time_off;
+			// time in period
+			double t = fmod(absolute_time, period);
+			is_on = t < time_on; // are we in the "on" part of the period?
+		}
+		if (is_on) {
+			if (buffer_clip_rect(buffer, &cursor_rect)) {
+				gl_color_rgba(colors[COLOR_CURSOR]);
+				glBegin(GL_QUADS);
+				rect_render(cursor_rect);
+				glEnd();
+			}
 		}
 	}
 }
diff --git a/config.c b/config.c
index 6dc821e..8431da3 100644
--- a/config.c
+++ b/config.c
@@ -190,9 +190,9 @@ void config_read(Ted *ted, char const *filename) {
 					default: {
 						char *equals = strchr(line, '=');
 						if (equals) {
-							char *key = line;
+							char const *key = line;
 							*equals = '\0';
-							char *value = equals + 1;
+							char const *value = equals + 1;
 							while (isspace(*key)) ++key;
 							while (isspace(*value)) ++value;
 							if (equals != line) {
@@ -254,32 +254,47 @@ void config_read(Ted *ted, char const *filename) {
 										config_err(cfg, "Expected ':' for key action. This line should look something like: %s = :command.", key);
 									}
 								} break;
-								case SECTION_CORE:
+								case SECTION_CORE: {
+									char const *endptr;
+									long long const integer = strtoll(value, (char **)&endptr, 10);
+									bool const is_integer = *endptr == '\0';
+									double const floating = strtod(value, (char **)&endptr);
+									bool const is_floating = *endptr == '\0';
+
 									if (streq(key, "tab-width")) {
-										int n = atoi(value);
-										if (n > 0 && n < 100) {
-											settings->tab_width = (u8)n;
+										if (is_integer && integer > 0 && integer < 100) {
+											settings->tab_width = (u8)integer;
 										} else {
 											config_err(cfg, "Invalid tab width: %s.", value);
 										}
 									} else if (streq(key, "cursor-width")) {
-										int n = atoi(value);
-										if (n > 0 && n < 100) {
-											settings->cursor_width = (u8)n;
+										if (is_integer && integer > 0 && integer < 100) {
+											settings->cursor_width = (u8)integer;
 										} else {
 											config_err(cfg, "Invalid cursor width: %s.", value);
 										}
 									} else if (streq(key, "undo-save-time")) {
-										int n = atoi(value);
-										if (n > 0 && n < 200) {
-											settings->undo_save_time = (u8)n;
+										if (is_integer && integer > 0 && integer < 200) {
+											settings->undo_save_time = (u8)integer;
 										} else {
 											config_err(cfg, "Invalid undo save time: %s.", value);
 										}
+									} else if (streq(key, "cursor-blink-time-on")) {
+										if (is_floating && floating >= 0 && floating < 1000) {
+											settings->cursor_blink_time_on = (float)floating;
+										} else {
+											config_err(cfg, "Invalid cursor blink time: %s.", value);
+										}
+									} else if (streq(key, "cursor-blink-time-off")) {
+										if (is_floating && floating >= 0 && floating < 1000) {
+											settings->cursor_blink_time_off = (float)floating;
+										} else {
+											config_err(cfg, "Invalid cursor blink time: %s.", value);
+										}
 									} else {
 										config_err(cfg, "Unrecognized core setting: %s.", key);
 									}
-									break;
+								} break;
 								}
 							}
 						} else {
diff --git a/main.c b/main.c
index 9ece8ac..05341d5 100644
--- a/main.c
+++ b/main.c
@@ -1,6 +1,4 @@
 // @TODO:
-// - select all (:select-all)
-// - blinking cursor (cursor-blink-time)
 // - text size (text-size, :increase-text-size, :decrease-text-size)
 #include "base.h"
 no_warn_start
@@ -18,6 +16,7 @@ no_warn_end
 #include "util.c"
 #include "colors.c"
 typedef struct {
+	float cursor_blink_time_on, cursor_blink_time_off;
 	u32 colors[COLOR_COUNT];
 	u8 tab_width;
 	u8 cursor_width;
diff --git a/ted.cfg b/ted.cfg
index 4132f6e..80dab7f 100644
--- a/ted.cfg
+++ b/ted.cfg
@@ -1,6 +1,11 @@
 [core]
 tab-width = 4
+# cursor width in pixels
 cursor-width = 1
+# time to blink cursor for (i.e. it will be on for cursor-blink-time-on seconds, then off for cursor-blink-time-off seconds)
+# set -off to 0 to disable blinking
+cursor-blink-time-on = 0.5
+cursor-blink-time-off = 0.3
 # if you do a bunch of typing, then undo, it will generally
 # undo the past this many seconds of editing.
 undo-save-time = 6
-- 
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