add -x flag for hexadecimal output

README

@@ -2,6 +2,7 @@ stint - simple, suckless-style color grabber for X11
 
 When run, waits for the user to press the left mouse button.  As long as the
 button is held down, it will continue to print the color under the pointer in
-decimal "RRR GGG BBB" format.  Exits when the button is released.
+decimal "RRR GGG BBB" format.  If a `-x` flag is provided, output will instead
+be printed in hexadecimal "#RRGGBB" format.  Exits when the button is released.
 
 Dependencies: Xlib

stint.c

@@ -18,15 +18,42 @@
 
 #include <stdio.h>
 #include <signal.h>
+#include <string.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/cursorfont.h>
 
+static enum {
+	INTEGER,
+	HEXADECIMAL,
+} output_type = INTEGER;
+
 int
 main(int argc, char *argv[])
 {
 	int rv = 0;
 
+	// Check for arguments
+	if (argc > 2) {
+		fprintf(stderr, "too many arguments\n");
+		return 1;
+	}
+
+	if (argc == 2) {
+		if ( !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help") ) {
+			fprintf(stdout, "usage: stint [OPTION]\n\n");
+			fprintf(stdout, "  -i, --integer     print output colour as integers (default)\n");
+			fprintf(stdout, "  -x, --hexadecimal print output colour as a hex colour code\n");
+			fprintf(stdout, "  -h, --help        print this help message\n");
+			return 0;
+		} else if ( !strcmp(argv[1], "-x") || !strcmp(argv[1], "--hexadecimal") ) {
+			output_type = HEXADECIMAL;
+		} else if ( strcmp(argv[1], "-i") && strcmp(argv[1], "--integer") ) {
+			fprintf(stderr, "unrecognised argument `%s`\n", argv[1]);
+			return 1;
+		}
+	}
+
 	// Get display, root window, and crosshair cursor
 	Display *dpy = XOpenDisplay(NULL);
 	if (!dpy) {
@@ -78,7 +105,11 @@ main(int argc, char *argv[])
 		XQueryColor(dpy, DefaultColormap(dpy, DefaultScreen(dpy)), &c);
 
 		// What color is it?
-		printf("%d %d %d\n", c.red >> 8, c.green >> 8, c.blue >> 8);
+		if (output_type == INTEGER)
+			printf("%d %d %d\n", c.red >> 8, c.green >> 8, c.blue >> 8);
+		else
+			printf("#%02x%02x%02x\n", c.red >> 8, c.green >> 8, c.blue >> 8);
+
 		fflush(stdout);
 
 		XNextEvent(dpy, &ev);