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use super::tmux_interface::*;
use super::tmux_interface_error::TmuxInterfaceError;
use std::process::Output;


/// # Manual
///
/// ```text
/// tmux set-environment [-gru] [-t target-session] name [value]
/// (alias: setenv)
/// ```
#[derive(Default)]
pub struct SetEnvironment<'a> {
    pub global: Option<bool>,                   // [-g]
    pub remove: Option<bool>,                   // [-r]
    pub unset: Option<bool>,                    // [-u]
    pub target_session: Option<&'a str>,        // [-t target-session]
    pub name: &'a str,                          // option
    pub value: Option<&'a str>                  // [value]
}

impl<'a> SetEnvironment<'a> {
    pub fn new() -> Self {
        Default::default()
    }
}


/// Global and session environment
impl<'a> TmuxInterface<'a> {

    const SET_ENVIRONMENT: &'static str = "set-environment";
    const SHOW_ENVIRONMENT: &'static str = "show-environment";


    /// # Manual
    ///
    /// ```text
    /// tmux set-environment [-gru] [-t target-session] name [value]
    /// (alias: setenv)
    /// ```
    pub fn set_environment(&self,
                           set_environment: &SetEnvironment
                           ) -> Result<Output, TmuxInterfaceError> {
        let mut args: Vec<&str> = Vec::new();
        if set_environment.global.unwrap_or(false) { args.push(g_KEY); }
        if set_environment.remove.unwrap_or(false) { args.push(r_KEY); }
        if set_environment.unset.unwrap_or(false) { args.push(u_KEY); }
        set_environment.target_session.and_then(|s| Some(args.extend_from_slice(&[t_KEY, &s])));
        args.push(set_environment.name);
        set_environment.value.and_then(|s| Some(args.push(&s)));
        let output = self.subcommand(TmuxInterface::SET_ENVIRONMENT, &args)?;
        Ok(output)
    }


    /// # Manual
    ///
    /// ```text
    /// tmux show-environment [-gs] [-t target-session] [variable]
    /// (alias: showenv)
    /// ```
    pub fn show_environment(&self,
                            global: Option<bool>,
                            shell_format: Option<bool>,
                            target_session: Option<&str>,
                            variable: Option<&str>
                            ) -> Result<Output, TmuxInterfaceError> {
        let mut args: Vec<&str> = Vec::new();
        if global.unwrap_or(false) { args.push(g_KEY); }
        if shell_format.unwrap_or(false) { args.push(s_KEY); }
        target_session.and_then(|s| Some(args.extend_from_slice(&[t_KEY, &s])));
        variable.and_then(|s| Some(args.push(&s)));
        let output = self.subcommand(TmuxInterface::SHOW_ENVIRONMENT, &args)?;
        Ok(output)
    }


}