Minor terminal tweaks

- Hide cursor while running.
- Fix silent exit on write failure due to resizing the terminal.
- Replace 'u_' prefix with '_now' suffix to be less confusing.

main.c

@@ -1063,6 +1063,7 @@ void draw(buffer* buf) {
   buffer_clear(buf);
   reposition_cursor(buf);
   draw_rows(buf);
+  hide_cursor(buf);
   buffer_write(buf);
 }
 
@@ -1081,7 +1082,7 @@ bool process_keypress() {
       colorize();
     }
   } else if (c == 'q') {
-    u_clear_screen();
+    clear_screen_now();
     return false;
   }
   return true;
@@ -1118,7 +1119,7 @@ void update_window_size() {
 void handle_window_size_changed(int signal) {
   (void)signal;
   update_window_size();
-  u_clear_screen();
+  clear_screen_now();
 }
 
 struct timespec subtract(struct timespec lhs, struct timespec rhs) {
@@ -1163,7 +1164,7 @@ int main(int argc, char** argv) {
   sim_init(in);
 
   enable_raw_mode();
-  u_clear_screen();
+  clear_screen_now();
   buffer buf = { 0, 0 };
   draw(&buf);
 

misc/terminal.c

@@ -13,13 +13,11 @@
 static struct termios g_orig_termios;
 
 static void write_stdin(const void* buf, ssize_t count) {
-  ssize_t res = write(STDIN_FILENO, buf, count);
-  if (res != count) {
-    exit(1);
-  }
+  int result = write(STDIN_FILENO, buf, count);
+  (void)result; // todo: handle EINTR
 }
 
-void u_clear_screen() {
+void clear_screen_now() {
   write_stdin("\x1b[2J", 4); // clear
   write_stdin("\x1b[H", 3);  // reposition cursor
 }
@@ -41,12 +39,12 @@ void show_cursor(buffer* buf) {
   buffer_append(buf, "\x1b[?25h", 6);
 }
 
-void u_show_cursor() {
+void show_cursor_now() {
   write_stdin("\x1b[?25h", 6);
 }
 
 void die(const char* msg) {
-  u_clear_screen();
+  clear_screen_now();
   perror(msg);
   exit(1);
 }
@@ -59,7 +57,7 @@ void disable_raw_mode() {
 
 void enable_raw_mode() {
   atexit(disable_raw_mode);
-  atexit(u_show_cursor);
+  atexit(show_cursor_now);
   if (tcgetattr(STDIN_FILENO, &g_orig_termios) == -1) {
     die("failed to enable raw mode");
   }

misc/terminal.h

@@ -12,7 +12,7 @@ void buffer_clear(buffer* buf);
 
 void die(const char* msg);
 
-void u_clear_screen();
+void clear_screen_now();
 
 void clear_screen(buffer* buf);
 void reposition_cursor(buffer* buf);