From 3603c02bf54df2a5309ac74639829f2393033edc Mon Sep 17 00:00:00 2001
From: Max Schillinger <maxschillinger@web.de>
Date: Wed, 21 Sep 2022 20:23:16 +0200
Subject: [PATCH] Alternate color during password input

Toggle screen color between two shades of blue during password input to get
some feedback.
---
 config.def.h | 1 +
 slock.c      | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index 9855e21..029af10 100644
--- a/config.def.h
+++ b/config.def.h
@@ -5,6 +5,7 @@ static const char *group = "nogroup";
 static const char *colorname[NUMCOLS] = {
 	[INIT] =   "black",     /* after initialization */
 	[INPUT] =  "#005577",   /* during input */
+	[INPUT_ALT] = "#227799", /* during input, second color */
 	[FAILED] = "#CC3333",   /* wrong password */
 };
 
diff --git a/slock.c b/slock.c
index 5ae738c..c4f28b8 100644
--- a/slock.c
+++ b/slock.c
@@ -27,6 +27,7 @@ char *argv0;
 enum {
 	INIT,
 	INPUT,
+	INPUT_ALT,
 	FAILED,
 	NUMCOLS
 };
@@ -187,7 +188,8 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 				}
 				break;
 			}
-			color = len ? INPUT : ((failure || failonclear) ? FAILED : INIT);
+			color = len ? (len%2 ? INPUT : INPUT_ALT)
+			            : ((failure || failonclear) ? FAILED : INIT);
 			if (running && oldc != color) {
 				for (screen = 0; screen < nscreens; screen++) {
 					XSetWindowBackground(dpy,
-- 
2.37.3