feat(clipboard): implement wayland clipboard manager

Cargo.lock

@@ -240,13 +240,11 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "cc",
- "itertools",
  "lazy_static",
  "lazycell",
- "libc",
  "log",
- "scopeguard",
  "thiserror",
+ "wait-timeout",
  "widestring",
 ]
 
@@ -857,6 +855,15 @@ version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 
+[[package]]
+name = "wait-timeout"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f200f5b12eb75f8c1ed65abd4b2db8a6e1b138a20de009dacee265a2498f3f6"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "wasi"
 version = "0.9.0+wasi-snapshot-preview1"

espanso-clipboard/Cargo.toml

@@ -8,7 +8,7 @@ build="build.rs"
 [features]
 # If the wayland feature is enabled, all X11 dependencies will be dropped
 # and wayland support will be enabled
-wayland = []
+wayland = ["wait-timeout"]
 
 [dependencies]
 log = "0.4.14"
@@ -20,10 +20,8 @@ lazy_static = "1.4.0"
 [target.'cfg(windows)'.dependencies]
 widestring = "0.4.3"
 
-[target.'cfg(target_os="linux")'.dependencies]
-libc = "0.2.85"
-scopeguard = "1.1.0"
-itertools = "0.10.0"
+[target.'cfg(target_os = "linux")'.dependencies]
+wait-timeout = { version = "0.2.0", optional = true }
 
 [build-dependencies]
 cc = "1.0.66"

espanso-clipboard/src/lib.rs

@@ -29,9 +29,9 @@ mod win32;
 #[cfg(not(feature = "wayland"))]
 mod x11;
 
-//#[cfg(target_os = "linux")]
-//#[cfg(feature = "wayland")]
-//mod wayland;
+#[cfg(target_os = "linux")]
+#[cfg(feature = "wayland")]
+mod wayland;
 
 #[cfg(target_os = "macos")]
 mod mac;
@@ -45,11 +45,17 @@ pub trait Clipboard {
 
 #[allow(dead_code)]
 pub struct ClipboardOptions {
+  // Wayland-only
+  // The number of milliseconds the wl-clipboard commands are allowed
+  // to run before triggering a time-out event.
+  wayland_command_timeout_ms: u64,
 }
 
 impl Default for ClipboardOptions {
   fn default() -> Self {
-    Self {}
+    Self {
+      wayland_command_timeout_ms: 2000,
+    }
   }
 }
 
@@ -74,7 +80,16 @@ pub fn get_clipboard(_: ClipboardOptions) -> Result<Box<dyn Clipboard>> {
 
 #[cfg(target_os = "linux")]
 #[cfg(feature = "wayland")]
-pub fn get_injector(options: InjectorCreationOptions) -> Result<Box<dyn Injector>> {
-  info!("using EVDEVInjector");
-  Ok(Box::new(evdev::EVDEVInjector::new(options)?))
-}
+pub fn get_clipboard(options: ClipboardOptions) -> Result<Box<dyn Clipboard>> {
+  // TODO: On some Wayland compositors (currently sway), the "wlr-data-control" protocol 
+  // could enable the use of a much more efficient implementation relying on the "wl-clipboard-rs" crate.
+  // Useful links: https://github.com/YaLTeR/wl-clipboard-rs/issues/8
+  //
+  // We could even decide the correct implementation at runtime by checking if the 
+  // required protocol is available, if so use the efficient implementation
+  // instead of the fallback one, which calls the wl-copy and wl-paste binaries, and is thus
+  // less efficient 
+
+  info!("using WaylandFallbackClipboard");
+  Ok(Box::new(wayland::fallback::WaylandFallbackClipboard::new(options)?))
+}

espanso-clipboard/src/wayland/README.md

@@ -0,0 +1,33 @@
+# Notes on Wayland and clipboard support
+
+### Running espanso as another user
+
+When running espanso as another user, we need to set up a couple of permissions
+in order to enable the clipboard tools to correctly connect to the Wayland desktop.
+
+In particular, we need to add the `espanso` user to the same group as the current user
+so that it can access the `/run/user/X` directory (with X depending on the user).
+
+```
+# Find the current user wayland dir with
+echo $XDG_RUNTIME_DIR  # in my case output: /run/user/1000
+
+ls -la /run/user/1000
+
+# Now add the `espanso` user to the current user group
+sudo usermod -a -G freddy espanso
+
+# Give permissions to the group
+chmod g+rwx /run/user/1000
+
+# Give write permission to the wayland socket
+chmod g+w /run/user/1000/wayland-0
+```
+
+Now the clipboard should work as expected
+
+## Better implementation
+
+On some Wayland compositors (currently sway), the "wlr-data-control" protocol could enable the use of a much more efficient implementation relying on the "wl-clipboard-rs" crate.
+
+Useful links: https://github.com/YaLTeR/wl-clipboard-rs/issues/8

espanso-clipboard/src/wayland/fallback/mod.rs

@@ -0,0 +1,191 @@
+/*
+ * This file is part of espanso.
+ *
+ * Copyright (C) 2019-2021 Federico Terzi
+ *
+ * espanso is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * espanso is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+use std::{
+  io::{Read, Write},
+  os::unix::net::UnixStream,
+  path::PathBuf,
+  process::Stdio,
+};
+
+use crate::{Clipboard, ClipboardOptions};
+use anyhow::Result;
+use log::error;
+use std::process::Command;
+use thiserror::Error;
+use wait_timeout::ChildExt;
+
+pub(crate) struct WaylandFallbackClipboard {
+  command_timeout: u64,
+}
+
+impl WaylandFallbackClipboard {
+  pub fn new(options: ClipboardOptions) -> Result<Self> {
+    // Make sure wl-paste and wl-copy are available
+    if Command::new("wl-paste").arg("--version").output().is_err() {
+      error!("unable to call 'wl-paste' binary, please install the wl-clipboard package.");
+      return Err(WaylandFallbackClipboardError::MissingWLClipboard().into());
+    }
+    if Command::new("wl-copy").arg("--version").output().is_err() {
+      error!("unable to call 'wl-copy' binary, please install the wl-clipboard package.");
+      return Err(WaylandFallbackClipboardError::MissingWLClipboard().into());
+    }
+
+    // Try to connect to the wayland display
+    let wayland_socket = if let Ok(runtime_dir) = std::env::var("XDG_RUNTIME_DIR") {
+      PathBuf::from(runtime_dir).join("wayland-0")
+    } else {
+      error!("environment variable XDG_RUNTIME_DIR is missing, can't initialize the clipboard");
+      return Err(WaylandFallbackClipboardError::MissingEnvVariable().into());
+    };
+    if UnixStream::connect(wayland_socket).is_err() {
+      error!("failed to connect to Wayland display");
+      return Err(WaylandFallbackClipboardError::ConnectionFailed().into());
+    }
+
+    Ok(Self {
+      command_timeout: options.wayland_command_timeout_ms,
+    })
+  }
+}
+
+impl Clipboard for WaylandFallbackClipboard {
+  fn get_text(&self) -> Option<String> {
+    let timeout = std::time::Duration::from_millis(self.command_timeout);
+    match Command::new("wl-paste")
+      .arg("--no-newline")
+      .stdout(Stdio::piped())
+      .spawn()
+    {
+      Ok(mut child) => match child.wait_timeout(timeout) {
+        Ok(status_code) => {
+          if let Some(status) = status_code {
+            if status.success() {
+              if let Some(mut io) = child.stdout {
+                let mut output = Vec::new();
+                io.read_to_end(&mut output).ok()?;
+                Some(String::from_utf8_lossy(&output).to_string())
+              } else {
+                None
+              }
+            } else {
+              error!("error, wl-paste exited with non-zero exit code");
+              None
+            }
+          } else {
+            error!("error, wl-paste has timed-out, killing the process");
+            if child.kill().is_err() {
+              error!("unable to kill wl-paste");
+            }
+            None
+          }
+        }
+        Err(err) => {
+          error!("error while executing 'wl-paste': {}", err);
+          None
+        }
+      },
+      Err(err) => {
+        error!("could not invoke 'wl-paste': {}", err);
+        None
+      }
+    }
+  }
+
+  fn set_text(&self, text: &str) -> anyhow::Result<()> {
+    self.invoke_command_with_timeout(&mut Command::new("wl-copy"), text.as_bytes(), "wl-copy")
+  }
+
+  fn set_image(&self, image_path: &std::path::Path) -> anyhow::Result<()> {
+    if !image_path.exists() || !image_path.is_file() {
+      return Err(WaylandFallbackClipboardError::ImageNotFound(image_path.to_path_buf()).into());
+    }
+
+    // Load the image data
+    let mut file = std::fs::File::open(image_path)?;
+    let mut data = Vec::new();
+    file.read_to_end(&mut data)?;
+
+    self.invoke_command_with_timeout(&mut Command::new("wl-copy").arg("--type").arg("image/png"), &data, "wl-copy")
+  }
+
+  fn set_html(&self, html: &str, _fallback_text: Option<&str>) -> anyhow::Result<()> {
+    self.invoke_command_with_timeout(&mut Command::new("wl-copy").arg("--type").arg("text/html"), html.as_bytes(), "wl-copy")
+  }
+}
+
+impl WaylandFallbackClipboard {
+  fn invoke_command_with_timeout(&self, command: &mut Command, data: &[u8], name: &str) -> Result<()> {
+    let timeout = std::time::Duration::from_millis(self.command_timeout);
+    match command
+      .stdin(Stdio::piped())
+      .spawn()
+    {
+      Ok(mut child) => {
+        if let Some(stdin) = child.stdin.as_mut() {
+          stdin.write_all(data)?;
+        }
+        match child.wait_timeout(timeout) {
+          Ok(status_code) => {
+            if let Some(status) = status_code {
+              if status.success() {
+                Ok(())
+              } else {
+                error!("error, {} exited with non-zero exit code", name);
+                Err(WaylandFallbackClipboardError::SetOperationFailed().into())
+              }
+            } else {
+              error!("error, {} has timed-out, killing the process", name);
+              if child.kill().is_err() {
+                error!("unable to kill {}", name);
+              }
+              Err(WaylandFallbackClipboardError::SetOperationFailed().into())
+            }
+          }
+          Err(err) => {
+            error!("error while executing '{}': {}", name, err);
+            Err(WaylandFallbackClipboardError::SetOperationFailed().into())
+          }
+        }
+      }
+      Err(err) => {
+        error!("could not invoke '{}': {}", name, err);
+        Err(WaylandFallbackClipboardError::SetOperationFailed().into())
+      }
+    }
+  }
+}
+
+#[derive(Error, Debug)]
+pub(crate) enum WaylandFallbackClipboardError {
+  #[error("wl-clipboard binaries are missing")]
+  MissingWLClipboard(),
+
+  #[error("missing XDG_RUNTIME_DIR env variable")]
+  MissingEnvVariable(),
+
+  #[error("can't connect to Wayland display")]
+  ConnectionFailed(),
+
+  #[error("clipboard set operation failed")]
+  SetOperationFailed(),
+
+  #[error("image not found: `{0}`")]
+  ImageNotFound(PathBuf),
+}

espanso-clipboard/src/wayland/mod.rs

@@ -0,0 +1,20 @@
+/*
+ * This file is part of espanso.
+ *
+ * Copyright (C) 2019-2021 Federico Terzi
+ *
+ * espanso is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * espanso is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+pub(crate) mod fallback;

espanso-clipboard/src/x11/mod.rs

@@ -17,4 +17,4 @@
  * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-pub mod native;
+pub(crate) mod native;

espanso-detect/src/hotkey/mod.rs

@@ -73,18 +73,22 @@ impl HotKey {
     })
   }
 
+  #[allow(dead_code)]
   pub(crate) fn has_ctrl(&self) -> bool {
     self.modifiers.contains(&ShortcutKey::Control)
   }
 
+  #[allow(dead_code)]
   pub(crate) fn has_meta(&self) -> bool {
     self.modifiers.contains(&ShortcutKey::Meta)
   }
 
+  #[allow(dead_code)]
   pub(crate) fn has_alt(&self) -> bool {
     self.modifiers.contains(&ShortcutKey::Alt)
   }
 
+  #[allow(dead_code)]
   pub(crate) fn has_shift(&self) -> bool {
     self.modifiers.contains(&ShortcutKey::Shift)
   }

espanso/Cargo.toml

@@ -10,7 +10,7 @@ edition = "2018"
 
 [features]
 # If the wayland feature is enabled, all X11 dependencies will be dropped
-# and only EVDEV-based methods will be supported.
+# and only methods suitable for Wayland will be used
 wayland = ["espanso-detect/wayland", "espanso-inject/wayland", "espanso-clipboard/wayland"]
 
 [dependencies]

espanso/src/main.rs

@@ -12,6 +12,7 @@ use simplelog::{CombinedLogger, Config, LevelFilter, TermLogger, TerminalMode};
 
 fn main() {
   println!("Hello, world!z");
+
   CombinedLogger::init(vec![
     TermLogger::new(LevelFilter::Debug, Config::default(), TerminalMode::Mixed),
     // WriteLogger::new(
@@ -22,6 +23,9 @@ fn main() {
   ])
   .unwrap();
 
+  let clipboard = espanso_clipboard::get_clipboard(Default::default()).unwrap();
+  println!("clipboard: {:?}", clipboard.get_text());
+
   // let icon_paths = vec![
   //   (
   //     espanso_ui::icons::TrayIcon::Normal,
@@ -68,7 +72,8 @@ fn main() {
     let mut source = get_source(SourceCreationOptions {
       //use_evdev: true,
       hotkeys: vec![
-        HotKey::new(1, "OPTION+SPACE").unwrap(),
+        HotKey::new(1, "CTRL+SPACE").unwrap(),
+        //HotKey::new(1, "OPTION+SPACE").unwrap(),
         HotKey::new(2, "CTRL+OPTION+3").unwrap(),
       ],
       ..Default::default()
@@ -96,9 +101,9 @@ fn main() {
             if hotkey.hotkey_id == 2 {
               println!("clip {:?}", clipboard.get_text());
             } else if hotkey.hotkey_id == 1 {
-              //clipboard.set_text("test text").unwrap();
+              clipboard.set_text("test text").unwrap();
               //clipboard.set_html("<i>test text</i>", Some("test text fallback")).unwrap();
-              clipboard.set_image(&PathBuf::from("/home/freddy/insync/Development/Espanso/Images/icongreen.png")).unwrap();
+              //clipboard.set_image(&PathBuf::from("/home/freddy/insync/Development/Espanso/Images/icongreen.png")).unwrap();
             }
           }
         }