-r to restrict input to actual options

README.md

@@ -5,6 +5,9 @@ Extra stuff added to vanilla dmenu:
 - reads Xresources (ergo pywal compatible)
 - alpha patch, which importantly allows this build to be embedded in transparent st
 - can view color characters like emoji (libxft-bgra is required for this reason)
+- `-P` for password mode: hide user imput
+- `-r` to reject non-matching input
+- dmenu options are mouse clickable
 
 ## Installation
 

dmenu.1

@@ -3,7 +3,7 @@
 dmenu \- dynamic menu
 .SH SYNOPSIS
 .B dmenu
-.RB [ \-bfivP ]
+.RB [ \-bfirvP ]
 .RB [ \-l
 .IR lines ]
 .RB [ \-m
@@ -50,6 +50,9 @@ dmenu matches menu items case insensitively.
 .B \-P
 dmenu will not directly display the keyboard input, but instead replace it with dots. All data from stdin will be ignored.
 .TP
+.B \-r
+dmenu will reject any input which would result in no matching option left.
+.TP
 .BI \-l " lines"
 dmenu lists items vertically, with the given number of lines.
 .TP

dmenu.c

@@ -43,6 +43,7 @@ static char *embed;
 static int bh, mw, mh;
 static int inputw = 0, promptw, passwd = 0;
 static int lrpad; /* sum of left and right padding */
+static int reject_no_match = 0;
 static size_t cursor;
 static struct item *items = NULL;
 static struct item *matches, *matchend;
@@ -323,12 +324,26 @@ insert(const char *str, ssize_t n)
 {
 	if (strlen(text) + n > sizeof text - 1)
 		return;
+
+	static char last[BUFSIZ] = "";
+	if(reject_no_match) {
+		/* store last text value in case we need to revert it */
+		memcpy(last, text, BUFSIZ);
+	}
+
 	/* move existing text out of the way, insert new text, and update cursor */
 	memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));
 	if (n > 0)
 		memcpy(&text[cursor], str, n);
 	cursor += n;
 	match();
+
+	if(!matches && reject_no_match) {
+		/* revert to last text value if theres no match */
+		memcpy(text, last, BUFSIZ);
+		cursor -= n;
+		match();
+	}
 }
 
 static size_t
@@ -860,7 +875,7 @@ setup(void)
 static void
 usage(void)
 {
-	fputs("usage: dmenu [-bfiPv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
+	fputs("usage: dmenu [-bfiPrv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
 	      "             [-nb color] [-nf color] [-sb color] [-sf color] [-w windowid]\n", stderr);
 	exit(1);
 }
@@ -910,6 +925,8 @@ main(int argc, char *argv[])
 			fstrstr = cistrstr;
 		} else if (!strcmp(argv[i], "-P"))   /* is the input a password */
 		        passwd = 1;
+		else if (!strcmp(argv[i], "-r")) /* reject input which results in no match */
+			reject_no_match = 1;
 		else if (i + 1 == argc)
 			usage();
 		/* these options take one argument */