Change simulation stepping key to ctrl+f

README.md

@@ -65,7 +65,8 @@ Run the interactive terminal UI, useful for debugging or observing behavior. Pas
 - `ctrl+q`: quit
 - Arrow keys or `ctrl+h/j/k/l`: move cursor
 - `A`-`Z`, `a`-`z`, `0`-`9`, and other printable characters: write character to grid at cursor
-- Spacebar: step the simulation one tick
+- Spacebar: play or pause
+- `ctrl+f`: step the simulation one tick forward
 - `ctrl+u`: undo
 - return or enter: change into or out of overwrite/append mode
 - `/`: change into or out of key-trigger mode (for the `!` operator)

tui_main.c

@@ -721,7 +721,7 @@ int main(int argc, char** argv) {
         input_mode = Tui_input_mode_piano;
       }
       break;
-    case AND_CTRL(' '):
+    case AND_CTRL('f'):
       undo_history_push(&undo_hist, &field, tick_num);
       orca_run(field.buffer, markmap_r.buffer, field.height, field.width,
                tick_num, &bank, piano_bits);