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|
#[cfg(feature = "general_renderer")]
use crate::error::GeneralRendererSerializeError;
use crate::{
AnyOutput, ChainProcess, RenderResult, asset::dispatcher::Dispatcher,
error::ProgramExecuteError,
};
use std::{env, fmt::Display, pin::Pin};
#[doc(hidden)]
pub mod exec;
#[doc(hidden)]
pub mod setup;
mod config;
pub use config::*;
mod flag;
pub use flag::*;
use tokio::io::AsyncWriteExt;
/// Program, used to define the behavior of the entire command-line program
#[derive(Default)]
pub struct Program<C, G>
where
C: ProgramCollect,
G: Display,
{
pub(crate) collect: std::marker::PhantomData<C>,
pub(crate) group: std::marker::PhantomData<G>,
pub(crate) args: Vec<String>,
pub(crate) dispatcher: Vec<Box<dyn Dispatcher<G>>>,
pub stdout_setting: ProgramStdoutSetting,
pub user_context: ProgramUserContext,
#[cfg(feature = "general_renderer")]
pub general_renderer_name: GeneralRendererSetting,
}
impl<C, G> Program<C, G>
where
C: ProgramCollect<Enum = G>,
G: Display,
{
/// Creates a new Program instance, initializing args from environment.
pub fn new() -> Self {
Program {
collect: std::marker::PhantomData,
group: std::marker::PhantomData,
args: env::args().collect(),
dispatcher: Vec::new(),
stdout_setting: Default::default(),
user_context: Default::default(),
#[cfg(feature = "general_renderer")]
general_renderer_name: GeneralRendererSetting::Disable,
}
}
/// Run the command line program
pub async fn exec_without_render(mut self) -> Result<RenderResult, ProgramExecuteError> {
self.args = self.args.iter().skip(1).cloned().collect();
crate::exec::exec(self).await.map_err(|e| e.into())
}
/// Run the command line program
pub async fn exec(self) {
let stdout_setting = self.stdout_setting.clone();
let result = match self.exec_without_render().await {
Ok(r) => r,
Err(e) => match e {
ProgramExecuteError::DispatcherNotFound => {
eprintln!("Dispatcher not found");
return;
}
ProgramExecuteError::RendererNotFound(renderer_name) => {
eprintln!("Renderer `{}` not found", renderer_name);
return;
}
ProgramExecuteError::Other(e) => {
eprintln!("{}", e);
return;
}
},
};
// Render result
if stdout_setting.render_output && !result.is_empty() {
print!("{}", result);
if let Err(e) = tokio::io::stdout().flush().await
&& stdout_setting.error_output
{
eprintln!("{}", e);
}
}
}
}
/// Collected program context
///
/// Note: It is recommended to use the `gen_program!()` macro from [mingling_macros](https://crates.io/crates/mingling_macros) to automatically create this type
pub trait ProgramCollect {
/// Enum type representing internal IDs for the program
type Enum: Display;
/// Build an [AnyOutput](./struct.AnyOutput.html) to indicate that a renderer was not found
fn build_renderer_not_found(member_id: Self::Enum) -> AnyOutput<Self::Enum>;
/// Build an [AnyOutput](./struct.AnyOutput.html) to indicate that a dispatcher was not found
fn build_dispatcher_not_found(args: Vec<String>) -> AnyOutput<Self::Enum>;
/// Render the input [AnyOutput](./struct.AnyOutput.html)
fn render(any: AnyOutput<Self::Enum>, r: &mut RenderResult);
/// Find a matching chain to continue execution based on the input [AnyOutput](./struct.AnyOutput.html), returning a new [AnyOutput](./struct.AnyOutput.html)
fn do_chain(
any: AnyOutput<Self::Enum>,
) -> Pin<Box<dyn Future<Output = ChainProcess<Self::Enum>> + Send>>;
/// Whether the program has a renderer that can handle the current [AnyOutput](./struct.AnyOutput.html)
fn has_renderer(any: &AnyOutput<Self::Enum>) -> bool;
/// Whether the program has a chain that can handle the current [AnyOutput](./struct.AnyOutput.html)
fn has_chain(any: &AnyOutput<Self::Enum>) -> bool;
/// Perform general rendering and presentation of any type
#[cfg(feature = "general_renderer")]
fn general_render(
any: AnyOutput<Self::Enum>,
setting: &GeneralRendererSetting,
) -> Result<RenderResult, GeneralRendererSerializeError>;
}
#[macro_export]
#[doc(hidden)]
macro_rules! __dispatch_program_renderers {
(
$( $render_ty:ty => $prev_ty:ident, )*
) => {
fn render(any: mingling::AnyOutput<Self::Enum>, r: &mut mingling::RenderResult) {
match any.member_id {
$(
Self::$prev_ty => {
// SAFETY: The `type_id` check ensures that `any` contains a value of type `$prev_ty`,
// so downcasting to `$prev_ty` is safe.
let value = unsafe { any.downcast::<$prev_ty>().unwrap_unchecked() };
<$render_ty as mingling::Renderer>::render(value, r);
}
)*
_ => (),
}
}
};
}
#[macro_export]
#[doc(hidden)]
macro_rules! __dispatch_program_chains {
(
$( $chain_ty:ty => $chain_prev:ident, )*
) => {
fn do_chain(
any: mingling::AnyOutput<Self::Enum>,
) -> std::pin::Pin<Box<dyn Future<Output = mingling::ChainProcess<Self::Enum>> + Send>> {
match any.member_id {
$(
Self::$chain_prev => {
// SAFETY: The `type_id` check ensures that `any` contains a value of type `$chain_prev`,
// so downcasting to `$chain_prev` is safe.
let value = unsafe { any.downcast::<$chain_prev>().unwrap_unchecked() };
let fut = async { <$chain_ty as mingling::Chain<Self::Enum>>::proc(value).await };
Box::pin(fut)
}
)*
_ => panic!("No chain found for type id: {:?}", any.type_id),
}
}
};
}
|
