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//! Access the clipboard.
use std::fmt;
/// A buffer for short-term storage and transfer within and between
/// applications.
pub trait Clipboard {
/// Reads the current content of the [`Clipboard`] as text.
fn read(&self) -> Option<String>;
/// Writes the given text contents to the [`Clipboard`].
fn write(&mut self, contents: String);
}
/// A null implementation of the [`Clipboard`] trait.
#[derive(Debug, Clone, Copy)]
pub struct Null;
impl Clipboard for Null {
fn read(&self) -> Option<String> {
None
}
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"),
}
}
}
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