From 98528c238293258b1d0ad4bfd7292e816022e96e Mon Sep 17 00:00:00 2001
From: Daniel Liu <mr.picklepinosaur@gmail.com>
Date: Thu, 15 Oct 2020 17:51:30 -0400
Subject: [PATCH] applied reject no match patch

---
 dmenu.1 |  5 ++++-
 dmenu.c | 21 +++++++++++++++++++--
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/dmenu.1 b/dmenu.1
index c036baa..10d968f 100644
--- a/dmenu.1
+++ b/dmenu.1
@@ -3,7 +3,7 @@
 dmenu \- dynamic menu
 .SH SYNOPSIS
 .B dmenu
-.RB [ \-bfiv ]
+.RB [ \-bfirv ]
 .RB [ \-l
 .IR lines ]
 .RB [ \-m
@@ -50,6 +50,9 @@ is faster, but will lock up X until stdin reaches end\-of\-file.
 .B \-i
 dmenu matches menu items case insensitively.
 .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
diff --git a/dmenu.c b/dmenu.c
index 3f8f689..9a965e1 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -40,6 +40,7 @@ static char *embed;
 static int bh, mw, mh;
 static int inputw = 0, promptw;
 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;
@@ -283,12 +284,26 @@ 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
@@ -723,7 +738,7 @@ setup(void)
 static void
 usage(void)
 {
-	fputs("usage: dmenu [-bfiv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
+	fputs("usage: dmenu [-bfirv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
 	      "             [-nb color] [-nf color] [-sb color] [-sf color] [-w windowid]\n", stderr);
 	exit(1);
 }
@@ -783,7 +798,9 @@ main(int argc, char *argv[])
 		else if (!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
 			fstrncmp = strncasecmp;
 			fstrstr = cistrstr;
-		} else if (i + 1 == argc)
+		} 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 */
 		else if (!strcmp(argv[i], "-l"))   /* number of lines in vertical list */
-- 
2.20.1