feat: new clipboard manager module

src/clients/wayland/wlr_data_control/offer.rs

@@ -0,0 +1,74 @@
+use crate::lock;
+use nix::fcntl::OFlag;
+use nix::unistd::{close, pipe2};
+use smithay_client_toolkit::data_device::ReadPipe;
+use std::io;
+use std::os::fd::FromRawFd;
+use std::sync::{Arc, Mutex};
+use tracing::warn;
+use wayland_client::Main;
+use wayland_protocols::wlr::unstable::data_control::v1::client::zwlr_data_control_offer_v1::{
+    Event, ZwlrDataControlOfferV1,
+};
+
+#[derive(Debug, Clone)]
+struct Inner {
+    mime_types: Vec<String>,
+}
+
+#[derive(Debug, Clone)]
+pub struct DataControlOffer {
+    inner: Arc<Mutex<Inner>>,
+    pub(crate) offer: ZwlrDataControlOfferV1,
+}
+
+impl DataControlOffer {
+    pub(crate) fn new(offer: &Main<ZwlrDataControlOfferV1>) -> Self {
+        let inner = Arc::new(Mutex::new(Inner {
+            mime_types: Vec::new(),
+        }));
+
+        {
+            let inner = inner.clone();
+
+            offer.quick_assign(move |_, event, _| {
+                let mut inner = lock!(inner);
+                if let Event::Offer { mime_type } = event {
+                    inner.mime_types.push(mime_type);
+                }
+            });
+        }
+
+        Self {
+            offer: offer.detach(),
+            inner,
+        }
+    }
+
+    pub fn with_mime_types<F, T>(&self, f: F) -> T
+    where
+        F: FnOnce(&[String]) -> T,
+    {
+        let inner = lock!(self.inner);
+        f(&inner.mime_types)
+    }
+
+    pub fn receive(&self, mime_type: String) -> io::Result<ReadPipe> {
+        // create a pipe
+        let (readfd, writefd) = pipe2(OFlag::O_CLOEXEC)?;
+
+        self.offer.receive(mime_type, writefd);
+
+        if let Err(err) = close(writefd) {
+            warn!("Failed to close write pipe: {}", err);
+        }
+
+        Ok(unsafe { FromRawFd::from_raw_fd(readfd) })
+    }
+}
+
+impl Drop for DataControlOffer {
+    fn drop(&mut self) {
+        self.offer.destroy();
+    }
+}