implemented early keyboard grab for dmenu with a timeout for stdin data writers to prevent endless grabbings of the keyboard

.hgtags

@@ -4,3 +4,5 @@ d352e9dc112ee96aa5cad961a0ed880ae9ce7276 0.3
 7acf0dde1120542917bae12e0e42293f9d2cc899 0.4
 4a0ecd881c4fc15de4a0bebd79308b064be020ef 0.5
 25f679fb19686140a907684ffcb423b9e9d44b53 0.6
+5fc20d7158bd16b4d5f8d1c25e177680b6d54252 0.7
+409667a57221f7e50ba8b5248f638915cd61b366 0.8

README

@@ -1,6 +1,6 @@
 dmenu - dynamic menu
 --------------------
-dmenu is a generic, highly customizable, and efficient menu for X. 
+dmenu is a generic and efficient menu for X. 
 
 
 Requirements

config.arg.h

@@ -8,3 +8,4 @@
 #define SELFGCOLOR		"#eeeeee"
 #define NORMBGCOLOR		"#333333"
 #define NORMFGCOLOR		"#dddddd"
+#define STDIN_TIMEOUT		3 /* seconds */

config.default.h

@@ -8,3 +8,4 @@
 #define SELFGCOLOR		"#eeeeee"
 #define NORMBGCOLOR		"#333366"
 #define NORMFGCOLOR		"#cccccc"
+#define STDIN_TIMEOUT		3 /* seconds */

config.mk

@@ -1,5 +1,5 @@
 # dmenu version
-VERSION = 0.7
+VERSION = 0.9
 
 # Customize below to fit your system
 

dmenu.1

@@ -6,59 +6,54 @@ dmenu \- dynamic menu
 .RB [ \-v ]
 .SH DESCRIPTION
 .SS Overview
-.B dmenu
-is a generic, highly customizable, and efficient menu for X,
-originally designed for
+dmenu is a generic menu for X, originally designed for
 .BR dwm (1).
-It supports arbitrary, user defined menu contents.
+It manages huge amounts (up to 10.000 and more) of user defined menu items
+efficiently.
 .SS Options
 .TP
 .B \-v
 prints version information to standard output, then exits.
 .SH USAGE
-.B dmenu
-reads a list of newline-separated items from standard input and creates a menu.
-When the user selects an item or enters any text and presses Return, his choice
-is printed to standard output and
-.B dmenu
-terminates.
-.B dmenu
-is completely controlled by the keyboard.  The following keys are recognized:
+dmenu reads a list of newline-separated items from standard input and creates a
+menu.  When the user selects an item or enters any text and presses Return, his
+choice is printed to standard output and dmenu terminates.
+.P
+dmenu is completely controlled by the keyboard. The following keys are recognized:
 .TP
-Any printable character
-Appends the character to the text in the input field. This works as a filter:
+.B Any printable character
+Appends the character to the text in the input field.  This works as a filter:
 only items containing this text will be displayed.
 .TP
-Left/Right
+.B Left/Right
 Select the previous/next item.
 .TP
-Tab
+.B Tab
 Copy the selected item to the input field.
 .TP
-Return
-Confirm selection and quit (print the selected item to standard output).
+.B Return
+Confirm selection and quit (print the selected item to standard output). Returns
+.B 0
+on termination.
 .TP
-Shift-Return
+.B Shift-Return
 Confirm selection and quit (print the text in the input field to standard output).
+Returns
+.B 0
+on termination.
 .TP
-Escape
-Quit without selecting an item.
+.B Escape
+Quit without selecting an item. Returns
+.B 1
+on termination.
 .TP
-Backspace (Control-h)
+.B Backspace (Control-h)
 Remove enough characters from the input field to change its filtering effect.
 .TP
-Control-u
+.B Control-u
 Remove all characters from the input field.
-.P
-.B dmenu
-returns
-.B 0
-if Return is pressed on termination,
-.B 1
-if Escape is pressed.
 .SH CUSTOMIZATION
-.B dmenu
-is customized by creating a custom config.h and (re)compiling the source
+dmenu is customized by creating a custom config.h and (re)compiling the source
 code. This keeps it fast, secure and simple.
 .SH SEE ALSO
 .BR dwm (1)

main.c

@@ -11,6 +11,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/select.h>
+#include <sys/time.h>
 #include <X11/cursorfont.h>
 #include <X11/Xutil.h>
 #include <X11/keysym.h>
@@ -290,6 +292,8 @@ int
 main(int argc, char *argv[])
 {
 	char *maxname;
+	fd_set rd;
+	struct timeval timeout;
 	Item *i;
 	XEvent ev;
 	XSetWindowAttributes wa;
@@ -307,13 +311,23 @@ main(int argc, char *argv[])
 	screen = DefaultScreen(dpy);
 	root = RootWindow(dpy, screen);
 
-	maxname = readstdin();
-
-	/* grab as early as possible, but after reading all items!!! */
+	/* Note, the select() construction allows to grab all keypresses as
+	 * early as possible, to not loose them. But if there is no standard
+	 * input supplied, we will make sure to exit after MAX_WAIT_STDIN
+	 * seconds. This is convenience behavior for rapid typers.
+	 */ 
 	while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
 			 GrabModeAsync, CurrentTime) != GrabSuccess)
 		usleep(1000);
 
+	timeout.tv_usec = 0;
+	timeout.tv_sec = STDIN_TIMEOUT;
+	FD_ZERO(&rd);
+	FD_SET(STDIN_FILENO, &rd);
+	if(select(ConnectionNumber(dpy) + 1, &rd, NULL, NULL, &timeout) < 1)
+		goto UninitializedEnd;
+	maxname = readstdin();
+
 	/* style */
 	dc.sel[ColBG] = getcolor(SELBGCOLOR);
 	dc.sel[ColFG] = getcolor(SELFGCOLOR);
@@ -366,7 +380,6 @@ main(int argc, char *argv[])
 		}
 	}
 
-	XUngrabKeyboard(dpy, CurrentTime);
 	while(allitems) {
 		i = allitems->next;
 		free(allitems->text);
@@ -380,6 +393,8 @@ main(int argc, char *argv[])
 	XFreePixmap(dpy, dc.drawable);
 	XFreeGC(dpy, dc.gc);
 	XDestroyWindow(dpy, win);
+UninitializedEnd:
+	XUngrabKeyboard(dpy, CurrentTime);
 	XCloseDisplay(dpy);
 
 	return ret;