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extern crate shell;
extern crate docopt;
extern crate rustc_serialize;
pub extern crate pad;
pub use ::shell::MultiShell;
use ::std::error::Error;
use ::docopt::Docopt;
use ::rustc_serialize::Decodable;
pub trait Command {
type Error: Error;
#[inline]
fn name() -> Option<&'static str> {
None
}
#[inline]
fn usage() -> &'static str;
fn execute(&self, shell: &mut MultiShell) -> Result<(), Self::Error>;
}
pub trait Decode {
fn decode(args: Vec<String>) -> Self;
fn decode_with_version<S: Into<String>>(args: Vec<String>, version: S) -> Self;
}
impl<T: Command + Decodable> Decode for T {
fn decode(args: Vec<String>) -> Self {
let docopt = Docopt::new(T::usage())
.unwrap()
.options_first(true)
.argv(args)
.help(true);
docopt.decode().unwrap_or_else(|e| e.exit())
}
fn decode_with_version<S: Into<String>>(args: Vec<String>, version: S) -> Self {
let docopt = Docopt::new(T::usage())
.unwrap()
.options_first(true)
.argv(args)
.help(true)
.version(Some(version.into()));
docopt.decode().unwrap_or_else(|e| e.exit())
}
}
#[inline]
pub fn main_with_command<C: Command>(cmd: C) {
let mut shell = MultiShell::new_stdio(false);
let r = cmd.execute(&mut shell);
match r {
Ok(_) => (),
Err(e) => shell.error_full(&e, true).unwrap(),
}
}
#[macro_export]
macro_rules! route {
( name = $name:expr;
error = $error:path;
usage = $usage:expr;
match $cmd:path {
$( $left:pat => $right:path, )*
}
) => {
impl ::yacli::Command for $cmd {
type Error = $error;
fn name() -> Option<&'static str> { Some($name) }
fn usage() -> &'static str { $usage }
fn execute(&self, shell: &mut MultiShell) -> Result<(), Self::Error> {
if self.get_help() {
if let &Some(ref cmd) = self.get_command() {
match *cmd {
$( $left => {
println!("{}", <$right as ::yacli::Command>::usage().trim());
}),*
};
} else {
println!("{}", Self::usage().trim());
::std::process::exit(-1);
}
} else if self.get_list() {
let commands = &[ $( (<$right as ::yacli::Command>::name().unwrap().trim(),
<$right as ::yacli::Command>::usage().trim()
.lines()
.next()
.unwrap()) ),* ];
let title = "Command";
let mut max_cmd = commands.iter().map(|&(ref x,_)| x.len()).max().unwrap();
if max_cmd < title.len() {
max_cmd = title.len();
}
let max_help = commands.iter().map(|&(_,ref y)| y.len()).max().unwrap();
println!("{} | {}", ::yacli::pad::PadStr::pad_to_width(title, max_cmd), "Help");
println!("{}", String::from_utf8(vec![b'-'; max_cmd + 3 + max_help]).unwrap());
for &(ref name, ref usage) in commands {
println!("{} | {}", ::yacli::pad::PadStr::pad_to_width(*name, max_cmd), usage);
}
println!("");
println!("Use `help <command>` for more information on a specific command.");
::std::process::exit(-1);
} else {
if let &Some(ref cmd) = self.get_command() {
match *cmd {
$( $left => {
let mut args = self.get_args().clone();
if let Some(n) = <$right as ::yacli::Command>::name() {
args.insert(0, n.to_string());
}
let x = <$right as ::yacli::Decode>::decode(args);
try!(x.execute(shell));
}),*
};
} else {
println!("{}", Self::usage().trim());
}
}
Ok(())
}
}
};
}
#[macro_export]
macro_rules! main {
($t:path) => {
{
let args: Vec<_> = ::std::env::args().collect();
let cmd = <$t as ::yacli::Decode>::decode(args);
::yacli::main_with_command(cmd);
}
};
($t:path, $version:expr) => {
{
let args: Vec<_> = ::std::env::args().collect();
let cmd = <$t as ::yacli::Decode>::decode_with_version(args, $version);
::yacli::main_with_command(cmd);
}
};
}
#[macro_export]
macro_rules! generic_args {
($id:ident, $t:ty) => {
#[derive(Debug, RustcDecodable)]
pub struct $id {
cmd_help: Option<bool>,
arg_command: Option<$t>,
arg_args: Vec<String>,
flag_list: Option<bool>,
flag_verbose: Option<bool>,
}
#[allow(dead_code)]
impl $id {
pub fn get_args(&self) -> &Vec<String> {
&self.arg_args
}
pub fn get_command(&self) -> &Option<$t> {
&self.arg_command
}
pub fn get_help(&self) -> bool {
self.cmd_help.unwrap_or(false)
}
pub fn get_verbose(&self) -> bool {
self.flag_verbose.unwrap_or(false)
}
pub fn get_list(&self) -> bool {
self.flag_list.unwrap_or(false)
}
}
}
}