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use super::{Command, Usage};
use crate::{Config, Configurable, FrameworkError, Options, Runnable};
use std::path::PathBuf;
#[derive(Debug, Options)]
pub struct EntryPoint<Cmd>
where
Cmd: Command + Runnable,
{
#[options(short = "c", help = "path to configuration file")]
pub config: Option<PathBuf>,
#[options(short = "h", help = "print help message")]
pub help: bool,
#[options(short = "v", help = "be verbose")]
pub verbose: bool,
#[options(command)]
pub command: Option<Cmd>,
}
impl<Cmd> EntryPoint<Cmd>
where
Cmd: Command + Runnable,
{
fn command(&self) -> &Cmd {
self.command
.as_ref()
.unwrap_or_else(|| Cmd::print_usage_and_exit(&[]))
}
}
impl<Cmd> Runnable for EntryPoint<Cmd>
where
Cmd: Command + Runnable,
{
fn run(&self) {
self.command().run()
}
}
impl<Cmd> Command for EntryPoint<Cmd>
where
Cmd: Command + Runnable,
{
fn name() -> &'static str {
Cmd::name()
}
fn description() -> &'static str {
Cmd::description()
}
fn version() -> &'static str {
Cmd::version()
}
fn authors() -> &'static str {
Cmd::authors()
}
fn subcommand_usage(command: &str) -> Option<Usage> {
Cmd::subcommand_usage(command)
}
}
impl<Cfg, Cmd> Configurable<Cfg> for EntryPoint<Cmd>
where
Cmd: Command + Configurable<Cfg> + Runnable,
Cfg: Config,
{
fn config_path(&self) -> Option<PathBuf> {
match &self.config {
Some(cfg) => Some(cfg.clone()),
None => self.command.as_ref().and_then(|cmd| cmd.config_path()),
}
}
fn process_config(&self, config: Cfg) -> Result<Cfg, FrameworkError> {
match &self.command {
Some(cmd) => cmd.process_config(config),
None => Ok(config),
}
}
}