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//! A crate with bunch of lazy macros

/// Macro to construct subprocess command
///
/// Arguments:
///
///* ```cmd``` - to specify command name.
///
///Usage:
///
///* ```exec_cmd!(cmd=>"cmd_name", [arg1, arg2, ..., argN]) ```
#[macro_export]
macro_rules! cmd {
    (cmd=>$cmd:expr, $($arg:expr),*) => { std::process::Command::new($cmd)$(.arg($arg))* }
}

/// Macro to exectute subprocess silently.
///
/// All output will be redirected to null.
///
/// Arguments:
///
///* ```cmd``` - to specify command name.
///
///Usage:
///
///* ```exec_cmd!(cmd=>"cmd_name", [arg1, arg2, ..., argN]) ```
///
///Returns status code
#[macro_export]
macro_rules! exec_silent_cmd {
    (cmd=>$cmd:expr, $($arg:expr),*) => { std::process::Command::new($cmd)
                                                                 .stderr(std::process::Stdio::null())
                                                                 .stdout(std::process::Stdio::null())
                                                                 $(.arg($arg))*
                                                                 .status().unwrap() }
}

/// Macro to check if given path/string belongs to file.
///
/// Returns false if no such file exists or cannot access it.
#[macro_export]
macro_rules! is_file {
    ($path:expr) => { std::fs::metadata($path).ok().map_or(false, |data| data.is_file()) }
}

/// Macro to check if given path/string belongs to directory.
///
/// Returns false if no such directory exists or cannot access it.
#[macro_export]
macro_rules! is_dir {
    ($path:expr) => { std::fs::metadata($path).ok().map_or(false, |data| data.is_dir()) }
}

///Trace macro like ```println```
///
///It uses ```format_args!``` for creating formatted string from passed arguments.
///
///Prints with the following format: ```file!:line! - [type:] [Message]```
#[macro_export]
macro_rules! trace {
    ($($arg:tt)+) => {{ println!("{}", format_args!("{}:{} - {}", file!(), line!(), format_args!($($arg)+))); }};
}