Initial Commit

Makefile

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+CFLAGS=-g -Wall
+INCS=-I/usr/X11R6/include
+LIBS=-L/usr/X11R6/lib -lX11
+
+xpick:
+	$(CC) $(CFLAGS) $(INCS) $(LIBS) -o ${@}  xpick.c
+
+all: xpick
+
+clean:
+	rm -f xpick
+
+install: xpick
+	install -m755 xpick /usr/local/bin/xpick
+

README

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+# xpick
+
+pick a color and show it in hex.
+
+## Installation
+
+    $ make
+    $ sudo make install
+
+## Usage
+
+    $ xpick (then click somewhere)
+    #001800
+
+Use xclip to push the value into the clipboard instead of showing it on
+the terminal
+
+    $ xpick | xclip
+

xpick.c

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+#include <X11/Xlib.h> 
+#include <X11/Xutil.h>
+#include <X11/cursorfont.h>
+#include <stdio.h>
+
+
+int main() {
+
+    Display *dpy = XOpenDisplay(NULL);
+    Window root = RootWindow(dpy, DefaultScreen(dpy));
+
+    Cursor cursor = XCreateFontCursor(dpy, XC_tcross);
+    XColor fgc, bgc;
+    fgc.red = -1; fgc.green = 0; fgc.blue = 0;
+    bgc.red = -1; bgc.green = -1; bgc.blue = -1;
+
+    XRecolorCursor(dpy, cursor, &fgc, &bgc);
+    XGrabPointer(dpy, root, 0, ButtonReleaseMask, GrabModeAsync, GrabModeAsync, 
+            None, cursor, CurrentTime);
+
+    XEvent event;
+    XNextEvent(dpy, &event);
+    XUngrabPointer(dpy, CurrentTime);
+    XImage *ximage = XGetImage(dpy, root, event.xbutton.x_root, 
+            event.xbutton.y_root, 1, 1, -1, ZPixmap);
+
+    unsigned long p = XGetPixel(ximage, 0, 0);
+    XDestroyImage(ximage);
+
+    XColor result; result.pixel = p;
+    XQueryColor(dpy, DefaultColormap(dpy, DefaultScreen(dpy)), &result);
+    printf("#%02.2x%02.2x%02.2x\n",
+            result.red/256, result.green/256, result.blue/256);
+    return 0;
+}