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use crate::{
r_println,
systems::{
cmd::errors::{CmdExecuteError, CmdPrepareError, CmdProcessError, CmdRenderError},
render::{render_system::render, renderer::JVRenderResult},
},
};
use std::{
any::{Any, TypeId},
collections::HashMap,
future::Future,
};
pub struct JVCommandContext {
pub help: bool,
pub confirmed: bool,
}
pub trait JVCommand<Argument, Input, Collect>
where
Argument: clap::Parser + Send,
Input: Send,
Collect: Send,
{
/// Get help string for the command
fn get_help_str() -> String;
/// Run the command and convert the result into type-agnostic serialized information,
/// then hand it over to the universal renderer for rendering.
/// Universal renderer: uses the renderer specified by the `--renderer` flag.
fn process_to_renderer_override(
args: Vec<String>,
ctx: JVCommandContext,
renderer_override: String,
) -> impl Future<Output = Result<JVRenderResult, CmdProcessError>> + Send {
async move {
// If the `--help` flag is used,
// skip execution and return an error,
// unlike `process_to_render_system`,
// when the `--renderer` flag specifies a renderer, `--help` output is not allowed
if ctx.help {
return Err(CmdProcessError::RendererOverrideButRequestHelp);
}
let (data, type_id) = Self::process(args, ctx).await?;
let renderer_override = renderer_override.as_str();
// Serialize the data based on its concrete type
let render_result: Result<JVRenderResult, CmdRenderError> = if type_id
== std::any::TypeId::of::<crate::cmds::out::hex::JVHexOutput>()
{
let concrete_data = data
.downcast::<crate::cmds::out::hex::JVHexOutput>()
.map_err(|_| CmdProcessError::DowncastFailed)?;
include!("../render/_override_renderer_dispatcher.rs")
} else if type_id
== std::any::TypeId::of::<crate::cmds::out::mappings::JVMappingsOutput>()
{
let concrete_data = data
.downcast::<crate::cmds::out::mappings::JVMappingsOutput>()
.map_err(|_| CmdProcessError::DowncastFailed)?;
include!("../render/_override_renderer_dispatcher.rs")
} else if type_id == std::any::TypeId::of::<crate::cmds::out::status::JVStatusOutput>()
{
let concrete_data = data
.downcast::<crate::cmds::out::status::JVStatusOutput>()
.map_err(|_| CmdProcessError::DowncastFailed)?;
include!("../render/_override_renderer_dispatcher.rs")
} else {
return Err(CmdProcessError::NoMatchingCommand);
};
match render_result {
Ok(r) => Ok(r),
Err(e) => Err(CmdProcessError::Render(e)),
}
}
}
/// Run the command and hand it over to the rendering system
/// to select the appropriate renderer for the result
fn process_to_render_system(
args: Vec<String>,
ctx: JVCommandContext,
) -> impl Future<Output = Result<JVRenderResult, CmdProcessError>> + Send {
async {
// If the `--help` flag is used,
// skip execution and directly render help information
if ctx.help {
let mut r = JVRenderResult::default();
r_println!(r, "{}", Self::get_help_str());
return Ok(r);
}
let (data, id) = Self::process(args, ctx).await?;
match render(data, id).await {
Ok(r) => Ok(r),
Err(e) => Err(CmdProcessError::Render(e)),
}
}
}
fn process(
args: Vec<String>,
ctx: JVCommandContext,
) -> impl Future<Output = Result<(Box<dyn Any + Send + 'static>, TypeId), CmdProcessError>> + Send
{
async move {
let mut full_args = vec!["jv".to_string()];
full_args.extend(args);
let parsed_args = match Argument::try_parse_from(full_args) {
Ok(args) => args,
Err(_) => return Err(CmdProcessError::ParseError(Self::get_help_str())),
};
let (input, collect) = match tokio::try_join!(
Self::prepare(&parsed_args, &ctx),
Self::collect(&parsed_args, &ctx)
) {
Ok((input, collect)) => (input, collect),
Err(e) => return Err(CmdProcessError::from(e)),
};
let data = match Self::exec(input, collect).await {
Ok(output) => output,
Err(e) => return Err(CmdProcessError::from(e)),
};
Ok(data)
}
}
/// Prepare
/// Converts Argument input into parameters readable during the execution phase
fn prepare(
args: &Argument,
ctx: &JVCommandContext,
) -> impl Future<Output = Result<Input, CmdPrepareError>> + Send;
/// Resource collection
/// Reads required resources and sends them to the `exec` function
fn collect(
args: &Argument,
ctx: &JVCommandContext,
) -> impl Future<Output = Result<Collect, CmdPrepareError>> + Send;
/// Execute
/// Executes the results obtained from `prepare` and `collect`
/// Returns data that can be used for rendering
fn exec(
input: Input,
collect: Collect,
) -> impl Future<Output = Result<(Box<dyn Any + Send + 'static>, TypeId), CmdExecuteError>> + Send;
/// Get output type mapping
fn get_output_type_mapping() -> HashMap<String, TypeId>;
}
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