clipnotify

commit 094dd7e20a06eba80c2e6f27dee775106e0eeca9
parent a9faca40b3929f22ad1e21c071c853af47b0b7bc
Author: Chris Down <chris@chrisdown.name>
Date:   Fri,  4 Nov 2022 18:11:14 +0000

Add -s option to monitor specific selections

Originally suggested by Andre Blanke in #7, with changes in this patch
around code readability and backwards compatibility.

Diffstat:
M
clipnotify.c
 | 
62
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----

1 file changed, 58 insertions(+), 4 deletions(-)
diff --git a/clipnotify.c b/clipnotify.c
@@ -3,25 +3,79 @@
 #include <X11/extensions/Xfixes.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
-int main(void) {
+static enum selections {
+    NONE = 0,
+    SELECTION_CLIPBOARD = (1 << 0),
+    SELECTION_PRIMARY = (1 << 1),
+    SELECTION_SECONDARY = (1 << 2)
+} selections = NONE;
+
+int main(int argc, char *argv[]) {
+    static const char *usage =
+        "%s: Notify on clipboard events.\n\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:")) != -1) {
+        switch (opt) {
+            case 'h':
+                printf(usage, argv[0]);
+                return EXIT_SUCCESS;
+            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");
-        exit(1);
+        return EXIT_FAILURE;
     }
 
     root = DefaultRootWindow(disp);
 
     clip = XInternAtom(disp, "CLIPBOARD", False);
 
-    XFixesSelectSelectionInput(disp, root, XA_PRIMARY, XFixesSetSelectionOwnerNotifyMask);
-    XFixesSelectSelectionInput(disp, root, clip, XFixesSetSelectionOwnerNotifyMask);
+    /* <= 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);
 
     XNextEvent(disp, &evt);
     XCloseDisplay(disp);