//! 把 UTF-8 文本读写适配到当前平台的系统剪贴板命令。
//! 外部命令失败作为普通错误交给调用方处理；这里不解析或执行剪贴板中的程序文本。
//!
//! Clipboard text is always UTF-8, including Finder/LaunchServices launches without LANG.
use anyhow::{Result, bail};
#[cfg(target_os = "macos")]
/// 运行选定平台的剪贴板命令并检查其退出状态。
fn command(program: &str) -> std::process::Command {
    let mut cmd = std::process::Command::new(program);
    cmd.env("LC_ALL", "en_US.UTF-8")
        .env("LC_CTYPE", "en_US.UTF-8")
        .env("LANG", "en_US.UTF-8");
    cmd
}
/// 取得系统剪贴板的 UTF-8 文本，失败作为可显示错误返回。
pub fn read() -> Result<String> {
    #[cfg(target_os = "macos")]
    {
        let output = command("/usr/bin/pbpaste")
            .arg("-Prefer")
            .arg("txt")
            .output()?;
        if !output.status.success() {
            bail!("system clipboard read failed");
        }
        // Never silently replace invalid bytes in the user's source.
        Ok(String::from_utf8(output.stdout)?)
    }
    #[cfg(not(target_os = "macos"))]
    {
        bail!("system clipboard adapter is not available on this platform")
    }
}
/// 将提供的文本交给系统剪贴板命令，不执行文本内容。
pub fn write(value: &str) -> Result<()> {
    #[cfg(target_os = "macos")]
    {
        use std::io::Write;
        let mut child = command("/usr/bin/pbcopy")
            .stdin(std::process::Stdio::piped())
            .spawn()?;
        let mut stdin = child
            .stdin
            .take()
            .ok_or_else(|| anyhow::anyhow!("clipboard stdin is unavailable"))?;
        stdin.write_all(value.as_bytes())?;
        drop(stdin);
        if !child.wait()?.success() {
            bail!("system clipboard write failed");
        }
        Ok(())
    }
    #[cfg(not(target_os = "macos"))]
    {
        let _ = value;
        bail!("system clipboard adapter is not available on this platform")
    }
}