Fix clipboard on linux

Fixes clipboard on X11 and Wayland by "daemonizing" the clipboard.

https://docs.rs/arboard/latest/arboard/trait.SetExtLinux.html#tymethod.wait
https://github.com/1Password/arboard/blob/master/examples/daemonize.rs

src/main.rs

@@ -87,6 +87,14 @@ struct Cli {
     #[clap(long)]
     no_clipboard: bool,
 
+    // Used internally for maintaining clipboard on linux.
+    #[clap(long, hide = true)]
+    daemon: bool,
+
+    // Used internally for maintaining clipboard on linux.
+    #[clap(long, hide = true)]
+    clipboard_content: Option<String>,
+
     /// Optional Path to a custom Handlebars template
     #[clap(short, long)]
     template: Option<PathBuf>,
@@ -100,6 +108,18 @@ fn main() -> Result<()> {
     env_logger::init();
     let args = Cli::parse();
 
+    if args.daemon {
+        if let Some(clipboard_content) = args.clipboard_content.as_ref() {
+            return match copy_to_clipboard(&clipboard_content) {
+                Ok(_) => Ok(()),
+                Err(e) => {
+                    eprintln!("Error: {}", e);
+                    std::process::exit(1)
+                }
+            }
+        }
+    }
+
     // Handlebars Template Setup
     let (template_content, template_name) = get_template(&args)?;
     let handlebars = handlebars_setup(&template_content, template_name)?;

src/template.rs

@@ -3,11 +3,13 @@
 
 use anyhow::{Context, Result};
 use arboard::Clipboard;
+use arboard::SetExtLinux;
 use colored::*;
 use handlebars::{no_escape, Handlebars};
 use inquire::Text;
 use regex::Regex;
 use std::io::Write;
+use std::{env, process};
 
 /// Set up the Handlebars template engine with a template string and a template name.
 ///
@@ -116,14 +118,29 @@ pub fn handle_undefined_variables(
 ///
 /// * `Result<()>` - An empty result indicating success or an error.
 pub fn copy_to_clipboard(rendered: &str) -> Result<()> {
-    match Clipboard::new() {
-        Ok(mut clipboard) => {
-            clipboard
-                .set_text(rendered.to_string())
-                .context("Failed to copy to clipboard")?;
-            Ok(())
+    if cfg!(target_os = "linux") {
+        if env::args().any(|arg| arg == "--daemon") {
+            let mut clipboard = Clipboard::new().context("Failed to initialize clipboard in daemon")?;
+            clipboard.set().wait().text(rendered).context("Failed to copy to clipboard in daemon")?;
+            return Ok(());
+        }
+        process::Command::new(env::current_exe()?)
+            .arg(".") // Path is required arg. Can be set as anything here.
+            .arg("--daemon")
+            .arg("--clipboard-content")
+            .arg(rendered)
+            .spawn().context("Failed to spawn daemon process")?;
+        return Ok(())
+    } else {
+        match Clipboard::new() {
+            Ok(mut clipboard) => {
+                clipboard
+                    .set_text(rendered.to_string())
+                    .context("Failed to copy to clipboard")?;
+                Ok(())
+            }
+            Err(e) => Err(anyhow::anyhow!("Failed to initialize clipboard: {}", e)),
         }
-        Err(e) => Err(anyhow::anyhow!("Failed to initialize clipboard: {}", e)),
     }
 }