Adding restrict return patch

README.md

@@ -26,6 +26,8 @@ dmenu, how to install it and how it works.
 
 ### Changelog:
 
+2021-05-17 - Added the restrict return patch
+
 2021-05-15 - Added the tsv and printindex patches
 
 2020-08-08 - Added the json, symbols, managed, morecolor, multi-selection and preselect patches
@@ -179,6 +181,10 @@ dmenu, how to install it and how it works.
       - adds a new flag to dmenu with which text input will be rejected if it would result in no
         matching item
 
+   - [restrict-return](https://tools.suckless.org/dmenu/patches/restrict-return/)
+      - adds a '-1' option which disables Shift-Return and Ctrl-Return
+      - this guarantees that dmenu will only output one item, and that item was read from stdin
+
    - [scroll](https://tools.suckless.org/dmenu/patches/scroll/)
       - this patch adds support for text scrolling
       - it doesn't append '...' for long input anymore as it can handle long text

config.def.h

@@ -18,6 +18,9 @@ static int instant = 0;                     /* -n  option; if 1, selects matchin
 static int center = 1;                      /* -c  option; if 0, dmenu won't be centered on the screen */
 static int min_width = 500;                 /* minimum width when centered */
 #endif // CENTER_PATCH
+#if RESTRICT_RETURN_PATCH
+static int restrict_return = 0;             /* -1 option; if 1, disables shift-return and ctrl-return */
+#endif // RESTRICT_RETURN_PATCH
 /* -fn option overrides fonts[0]; default X11 font or font set */
 #if PANGO_PATCH
 static char font[] = "monospace 10";

dmenu.c

@@ -925,6 +925,10 @@ insert:
 		break;
 	case XK_Return:
 	case XK_KP_Enter:
+		#if RESTRICT_RETURN_PATCH
+		if (restrict_return && (!sel || ev->state & (ShiftMask | ControlMask)))
+			break;
+		#endif // RESTRICT_RETURN_PATCH
 		#if !MULTI_SELECTION_PATCH
 		#if JSON_PATCH
 		if (!printjsonssel(ev->state))
@@ -1512,6 +1516,9 @@ usage(void)
 		#if REJECTNOMATCH_PATCH
 		"R" // (changed from r to R due to conflict with INCREMENTAL_PATCH)
 		#endif // REJECTNOMATCH_PATCH
+		#if RESTRICT_RETURN_PATCH
+		"1"
+		#endif // RESTRICT_RETURN_PATCH
 		"] "
 		#if MANAGED_PATCH
 		"[-wm] "
@@ -1630,6 +1637,10 @@ main(int argc, char *argv[])
 		} else if (!strcmp(argv[i], "-ix")) { /* adds ability to return index in list */
 			print_index = 1;
 		#endif // PRINTINDEX_PATCH
+		#if RESTRICT_RETURN_PATCH
+		} else if (!strcmp(argv[i], "-1")) {
+			restrict_return = 1;
+		#endif // RESTRICT_RETURN_PATCH
 		} else if (i + 1 == argc)
 			usage();
 		/* these options take one argument */

patches.def.h

@@ -233,6 +233,12 @@
  */
 #define REJECTNOMATCH_PATCH 0
 
+/* This patch adds a '-r' option which disables Shift-Return and Ctrl-Return.
+ * This guarantees that dmenu will only output one item, and that item was read from stdin.
+ * https://tools.suckless.org/dmenu/patches/restrict-return/
+ */
+#define RESTRICT_RETURN_PATCH 0
+
 /* This patch adds support for text scrolling and no longer appends '...' for long input as
  * it can handle long text.
  * https://tools.suckless.org/dmenu/patches/scroll/