1 files changed, 104 insertions, 0 deletions
diff --git a/snippets/clipblink.c b/snippets/clipblink.c
new file mode 100644
index 0000000..d84ca75
--- /dev/null
+++ b/snippets/clipblink.c
@@ -0,0 +1,104 @@
+// https://github.com/cdown/clipnotify
+
+#define _DEFAULT_SOURCE
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/Xfixes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static enum selections {
+	NONE = 0,
+	SELECTION_CLIPBOARD = (1 << 0),
+	SELECTION_PRIMARY = (1 << 1),
+	SELECTION_SECONDARY = (1 << 2)
+} selections = NONE;
+
+static int loop;
+
+int main(int argc, char *argv[]) {
+	static const char *usage =
+		"%s: Notify by exiting on clipboard events.\n\n"
+		"  -l    Instead of exiting, print a newline when a new selection is available.\n"
+		"  -s    The selection to use. Available selections:\n"
+		"        clipboard, primary, secondary\n"
+		"        The default is to monitor clipboard and primary.\n";
+	Display *disp;
+	Window root;
+	Atom clip;
+	XEvent evt;
+	int opt;
+
+	while ((opt = getopt(argc, argv, "hs:l")) != -1) {
+		switch (opt) {
+			case 'h':
+				printf(usage, argv[0]);
+				return EXIT_SUCCESS;
+			case 'l':
+				loop = 1;
+				break;
+			case 's': {
+				char *token = strtok(optarg, ",");
+				while (token != NULL) {
+					if (strcmp(token, "clipboard") == 0) {
+						selections |= SELECTION_CLIPBOARD;
+					} else if (strcmp(token, "primary") == 0) {
+						selections |= SELECTION_PRIMARY;
+					} else if (strcmp(token, "secondary") == 0) {
+						selections |= SELECTION_SECONDARY;
+					} else {
+						fprintf(stderr, "Unknown selection '%s'\n", token);
+						return EXIT_FAILURE;
+					}
+					token = strtok(NULL, ",");
+				}
+				break;
+			}
+			default:
+				fprintf(stderr, usage, argv[0]);
+				return EXIT_FAILURE;
+		}
+	}
+
+	disp = XOpenDisplay(NULL);
+	if (!disp) {
+		fprintf(stderr, "Can't open X display\n");
+		return EXIT_FAILURE;
+	}
+
+	root = DefaultRootWindow(disp);
+
+	clip = XInternAtom(disp, "CLIPBOARD", False);
+
+	/* <= 1.0.2 backwards compatibility */
+	if (!selections)
+		selections = SELECTION_CLIPBOARD | SELECTION_PRIMARY;
+
+	if (selections & SELECTION_CLIPBOARD)
+		XFixesSelectSelectionInput(disp, root, clip,
+								   XFixesSetSelectionOwnerNotifyMask);
+	if (selections & SELECTION_PRIMARY)
+		XFixesSelectSelectionInput(disp, root, XA_PRIMARY,
+								   XFixesSetSelectionOwnerNotifyMask);
+	if (selections & SELECTION_SECONDARY)
+		XFixesSelectSelectionInput(disp, root, XA_SECONDARY,
+								   XFixesSetSelectionOwnerNotifyMask);
+
+	if (loop) {
+		(void)setvbuf(stdout, NULL, _IONBF, 0);
+		do {
+			XNextEvent(disp, &evt);
+
+		for (unsigned int i = 0; i < 2; i += 1) {
+			printf("%c", 0);
+			fflush(stdout);
+			usleep(50000);
+		}
+		} while (1);
+	} else {
+		XNextEvent(disp, &evt);
+	}
+	XCloseDisplay(disp);
+}