Add clipboard support for Wayland

This commit adds clipboard support for Wayland. The implementation is
quite ugly though, as it requires the use of an external program and
shell (wl-clipboard). It doesn't add a hard dependency though, as if
the user doesn't want pasting the dependency is not required.

PKGBUILD

@@ -27,6 +27,10 @@ makedepends=(
     ninja
 )
 
+optdepends=(
+    'wl-clipboard: Clipboard support on Wayland'
+)
+
 provides=($pkgname)
 conflicts=($pkgname)
 source=(

README.md

@@ -34,6 +34,9 @@ can be themed to look identical to dmenu.
   - For Wayland support, which is optional.
 - wayland-protocols
   - For Wayland support, which is optional.
+- wl-clipboard
+  - For Wayland support, which is optional.
+  - Only required at runtime, and only if pasting is desired.
 - xkbcommon
   - For Wayland support, which is optional.
 - libX11

libs/arg.c

@@ -188,10 +188,16 @@ void moveend(Arg *arg) {
 }
 
 void paste(Arg *arg) {
+#if USEWAYLAND
+    if (protocol) {
+        paste_wl();
+    } else {
 #if USEX
-    if (!protocol) {
         paste_x11(arg->i);
+#endif
     }
+#elif USEX
+    paste_x11(arg->i);
 #endif
 }
 

libs/wl/wayland.c

@@ -74,6 +74,44 @@ int is_correct_modifier(struct state *state, char *modifier) {
     return 1;
 }
 
+/* This function is pretty garbage. However I don't feel like implementing all the garbage necessary to paste properly.
+ * If anyone wants to do it, feel free to pull request.
+ */
+char *wl_clipboard(void) {
+    FILE *fp;
+    char output_text[1024];
+    char *clipboard = malloc(sizeof(output_text));
+    clipboard[0] = '\0';
+
+    fp = popen("which wl-paste > /dev/null && wl-paste -t text/plain", "r");
+
+    if (fp == NULL) {
+        fprintf(stderr, "spmenu: Failed to open command\n");
+        return NULL;
+    }
+
+    while (fgets(output_text, sizeof(output_text), fp) != NULL) {
+        strcat(clipboard, output_text);
+    }
+
+    pclose(fp);
+
+    return clipboard;
+}
+
+void paste_wl(void) {
+    char *p, *q;
+
+    fprintf(stderr, "gentoo");
+
+    p = wl_clipboard();
+
+    insert(p, (q = strchr(p, '\n')) ? q - p : (ssize_t)strlen(p)); // insert selection
+
+    // draw the menu
+    drawmenu();
+}
+
 void keypress_wl(struct state *state, enum wl_keyboard_key_state key_state, xkb_keysym_t sym) {
     int i = 0;
     char buf[8];

libs/wl/wayland.h

@@ -149,6 +149,8 @@ static int set_exclusive_zone(struct state *state, unsigned int val);
 static int set_keyboard(struct state *state, int interactivity);
 static int add_layer_listener(struct state *state);
 static int set_visible_layer(struct state *state);
+static char *wl_clipboard(void);
+static void paste_wl(void);
 struct wl_buffer *create_buffer(struct state *state);
 
 /* Set to 0 if the connection was successful

spmenu.c

@@ -257,7 +257,7 @@ static int (*fstrncmp)(const char *, const char *, size_t) = strncasecmp;
 static char *(*fstrstr)(const char *, const char *) = cistrstr;
 
 #if USEX
-static void pastesel(void); // TODO: wayland clipboard
+static void pastesel(void);
 static void grabfocus(void); // focus doesn't need to be grabbed on wayland
 #endif