Merge pull request #1019 from hecrj/command-actions

Platform-specific `Command` implementations

1 files changed, 34 insertions, 0 deletions

diff --git a/native/src/clipboard.rs b/native/src/clipboard.rs
index 081b4004..60703c31 100644
--- a/native/src/clipboard.rs
+++ b/native/src/clipboard.rs
@@ -1,4 +1,5 @@
 //! Access the clipboard.
+use std::fmt;
 
 /// A buffer for short-term storage and transfer within and between
 /// applications.
@@ -21,3 +22,36 @@ impl Clipboard for Null {
 
     fn write(&mut self, _contents: String) {}
 }
+
+/// A clipboard action to be performed by some [`Command`].
+///
+/// [`Command`]: crate::Command
+pub enum Action<T> {
+    /// Read the clipboard and produce `T` with the result.
+    Read(Box<dyn Fn(Option<String>) -> T>),
+
+    /// Write the given contents to the clipboard.
+    Write(String),
+}
+
+impl<T> Action<T> {
+    /// Maps the output of a clipboard [`Action`] using the provided closure.
+    pub fn map<A>(self, f: impl Fn(T) -> A + 'static + Send + Sync) -> Action<A>
+    where
+        T: 'static,
+    {
+        match self {
+            Self::Read(o) => Action::Read(Box::new(move |s| f(o(s)))),
+            Self::Write(content) => Action::Write(content),
+        }
+    }
+}
+
+impl<T> fmt::Debug for Action<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Read(_) => write!(f, "Action::Read"),
+            Self::Write(_) => write!(f, "Action::Write"),
+        }
+    }
+}