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// Implementation reference: https://github.com/neovim/neovim/blob/f2906a4669a2eef6d7bf86a29648793d63c98949/runtime/autoload/provider/clipboard.vim#L68-L152
use anyhow::Result;
use std::borrow::Cow;
pub trait ClipboardProvider: std::fmt::Debug {
fn name(&self) -> Cow<str>;
fn get_contents(&self) -> Result<String>;
fn set_contents(&self, contents: String) -> Result<()>;
}
macro_rules! command_provider {
(paste => $get_prg:literal $( , $get_arg:literal )* ; copy => $set_prg:literal $( , $set_arg:literal )* ; ) => {{
Box::new(provider::CommandProvider {
get_cmd: provider::CommandConfig {
prg: $get_prg,
args: &[ $( $get_arg ),* ],
},
set_cmd: provider::CommandConfig {
prg: $set_prg,
args: &[ $( $set_arg ),* ],
},
})
}};
}
pub fn get_clipboard_provider() -> Box<dyn ClipboardProvider> {
// TODO: support for user-defined provider, probably when we have plugin support by setting a
// variable?
if exists("pbcopy") && exists("pbpaste") {
command_provider! {
paste => "pbpaste";
copy => "pbcopy";
}
} else if env_var_is_set("WAYLAND_DISPLAY") && exists("wl-copy") && exists("wl-paste") {
command_provider! {
paste => "wl-paste", "--no-newline";
copy => "wl-copy", "--type", "text/plain";
}
} else if env_var_is_set("DISPLAY") && exists("xclip") {
command_provider! {
paste => "xclip", "-o", "-selection", "clipboard";
copy => "xclip", "-i", "-selection", "clipboard";
}
} else if env_var_is_set("DISPLAY") && exists("xsel") && is_exit_success("xsel", &["-o", "-b"])
{
// FIXME: check performance of is_exit_success
command_provider! {
paste => "xsel", "-o", "-b";
copy => "xsel", "--nodetach", "-i", "-b";
}
} else if exists("lemonade") {
command_provider! {
paste => "lemonade", "paste";
copy => "lemonade", "copy";
}
} else if exists("doitclient") {
command_provider! {
paste => "doitclient", "wclip", "-r";
copy => "doitclient", "wclip";
}
} else if exists("win32yank.exe") {
// FIXME: does it work within WSL?
command_provider! {
paste => "win32yank.exe", "-o", "--lf";
copy => "win32yank.exe", "-i", "--crlf";
}
} else if exists("termux-clipboard-set") && exists("termux-clipboard-get") {
command_provider! {
paste => "termux-clipboard-get";
copy => "termux-clipboard-set";
}
} else if env_var_is_set("TMUX") && exists("tmux") {
command_provider! {
paste => "tmux", "save-buffer", "-";
copy => "tmux", "load-buffer", "-";
}
} else {
Box::new(provider::NopProvider)
}
}
fn exists(executable_name: &str) -> bool {
which::which(executable_name).is_ok()
}
fn env_var_is_set(env_var_name: &str) -> bool {
std::env::var_os(env_var_name).is_some()
}
fn is_exit_success(program: &str, args: &[&str]) -> bool {
std::process::Command::new(program)
.args(args)
.output()
.ok()
.and_then(|out| out.status.success().then(|| ())) // TODO: use then_some when stabilized
.is_some()
}
mod provider {
use super::ClipboardProvider;
use anyhow::{bail, Context as _, Result};
use std::borrow::Cow;
#[derive(Debug)]
pub struct NopProvider;
impl ClipboardProvider for NopProvider {
fn name(&self) -> Cow<str> {
Cow::Borrowed("none")
}
fn get_contents(&self) -> Result<String> {
Ok(String::new())
}
fn set_contents(&self, _: String) -> Result<()> {
Ok(())
}
}
#[derive(Debug)]
pub struct CommandConfig {
pub prg: &'static str,
pub args: &'static [&'static str],
}
impl CommandConfig {
fn execute(&self, input: Option<&str>, pipe_output: bool) -> Result<Option<String>> {
use std::io::Write;
use std::process::{Command, Stdio};
let stdin = input.map(|_| Stdio::piped()).unwrap_or_else(Stdio::null);
let stdout = pipe_output.then(Stdio::piped).unwrap_or_else(Stdio::null);
let mut child = Command::new(self.prg)
.args(self.args)
.stdin(stdin)
.stdout(stdout)
.stderr(Stdio::null())
.spawn()?;
if let Some(input) = input {
let mut stdin = child.stdin.take().context("stdin is missing")?;
stdin
.write_all(input.as_bytes())
.context("couldn't write in stdin")?;
}
// TODO: add timer?
let output = child.wait_with_output()?;
if !output.status.success() {
bail!("clipboard provider {} failed", self.prg);
}
if pipe_output {
Ok(Some(String::from_utf8(output.stdout)?))
} else {
Ok(None)
}
}
}
#[derive(Debug)]
pub struct CommandProvider {
pub get_cmd: CommandConfig,
pub set_cmd: CommandConfig,
}
impl ClipboardProvider for CommandProvider {
fn name(&self) -> Cow<str> {
if self.get_cmd.prg != self.set_cmd.prg {
Cow::Owned(format!("{}+{}", self.get_cmd.prg, self.set_cmd.prg))
} else {
Cow::Borrowed(self.get_cmd.prg)
}
}
fn get_contents(&self) -> Result<String> {
let output = self
.get_cmd
.execute(None, true)?
.context("output is missing")?;
Ok(output)
}
fn set_contents(&self, value: String) -> Result<()> {
self.set_cmd.execute(Some(&value), false).map(|_| ())
}
}
}
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