implemented the ^W command for refreshing the screen in loops, for sleeping and also the CTRL+L immediate editing command

* ^W can be added to loops in order to view progress in interactive mode.
  It also sleeps for a given number of milliseconds (10ms by default).
* In batch mode it is therefore the sleep command.
* Since CTRL+W is an immediate editing command, you will usually type it Caret+W.
  ASCII 23 however will also be accepted.
* While ^W only updates the screen, you can force a complete redraw by pressing CTRL+L.
  This is what most terminal applications use for redrawing.
  It will make it harder to insert ASCII 12, but this is seldom necessary since it
  is a form feed.
  ^L (ASCII 12 and the upcaret variant ) is still a whitespace character and therefore treated as a NOP.
* DEC TECO had CTRL+W as the refresh immediate editing command.
  Video TECO uses <ET> as a regular command for refreshign in loops.
  I'd rather keep ET reserved as a potential terminal configuration command
  as in DEC TECO, though.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/cmdline.c b/src/cmdline.c
index 605af73..1f12c7b 100644
--- a/src/cmdline.c
+++ b/src/cmdline.c
@@ -472,6 +472,11 @@ teco_state_process_edit_cmd(teco_machine_t *ctx, teco_machine_t *parent_ctx, gun
 		raise(SIGTSTP);
 		return TRUE;
 #endif
+
+	case TECO_CTL_KEY('L'):
+		/* causes a complete screen redraw */
+		teco_interface_refresh(TRUE);
+		return TRUE;
 	}
 
 	teco_interface_popup_clear();