make ^U delete whole line

config.h

@@ -0,0 +1,23 @@
+/* See LICENSE file for copyright and license details. */
+/* Default settings; can be overriden by command line. */
+
+static int topbar = 1;                      /* -b  option; if 0, dmenu appears at bottom     */
+/* -fn option overrides fonts[0]; default X11 font or font set */
+static const char *fonts[] = {
+	"monospace:size=10", "IPAGothic:size=10", "Symbola:size=10"
+};
+static const char *prompt      = NULL;      /* -p  option; prompt to the left of input field */
+static const char *colors[SchemeLast][2] = {
+	/*     fg         bg       */
+	[SchemeNorm] = { "#bbbbbb", "#222222" },
+	[SchemeSel] = { "#eeeeee", "#005577" },
+	[SchemeOut] = { "#000000", "#00ffff" },
+};
+/* -l option; if nonzero, dmenu uses vertical list with given number of lines */
+static unsigned int lines      = 0;
+
+/*
+ * Characters not considered part of a word while deleting words
+ * for example: " /?\"&[]"
+ */
+static const char worddelimiters[] = " ";

dmenu.c

@@ -358,13 +358,12 @@ keypress(XKeyEvent *ev)
 		case XK_n: ksym = XK_Down;      break;
 		case XK_p: ksym = XK_Up;        break;
 
+		case XK_u: /* delete left */
+			insert(NULL, 0 - cursor);
 		case XK_k: /* delete right */
 			text[cursor] = '\0';
 			match();
 			break;
-		case XK_u: /* delete left */
-			insert(NULL, 0 - cursor);
-			break;
 		case XK_w: /* delete word */
 			while (cursor > 0 && strchr(worddelimiters, text[nextrune(-1)]))
 				insert(NULL, nextrune(-1) - cursor);