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use std::any::Any;
use crate::{AnyOutput, Program, ProgramCollect, RenderResult, error::ProgramPanic};
#[derive(Default)]
pub struct ProgramHook<C>
where
C: ProgramCollect<Enum = C>,
{
/// Executes when the program starts running
pub begin: Option<fn()>,
/// Executes before the program dispatches
pub pre_dispatch: Option<fn(args: &Vec<String>)>,
/// Executes after the program dispatches
pub post_dispatch: Option<fn(entry: &C)>,
/// Executes before the type enters the chain
pub pre_chain: Option<fn(input: &C, raw: &dyn Any)>,
/// Executes after the chain processing for the type ends
pub post_chain: Option<fn(output: &AnyOutput<C>)>,
/// Executes before the type enters the renderer
pub pre_render: Option<fn(input: &C, raw: &dyn Any)>,
/// Executes after the type enters the renderer
pub post_render: Option<fn(result: &RenderResult)>,
/// Executes before the program ends
pub finish: Option<fn() -> i32>,
/// Executes when the program panics
pub exec_panic: Option<fn(&ProgramPanic)>,
}
impl<C> Program<C>
where
C: ProgramCollect<Enum = C>,
{
/// Adds a typed hook to the program. The hook will be called at the appropriate
/// lifecycle events.
pub fn with_hook(&mut self, hook: ProgramHook<C>) {
self.hooks.push(hook);
}
pub(crate) fn run_hook_on_begin(&self) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(begin) = hook.begin {
begin()
}
}
}
pub(crate) fn run_hook_pre_dispatch(&self, args: &Vec<String>) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(pre_dispatch) = hook.pre_dispatch {
pre_dispatch(args)
}
}
}
pub(crate) fn run_hook_post_dispatch(&self, entry: &C) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(post_dispatch) = hook.post_dispatch {
post_dispatch(entry)
}
}
}
pub(crate) fn run_hook_pre_chain(&self, input: &C, raw: &dyn Any) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(pre_chain) = hook.pre_chain {
pre_chain(input, raw)
}
}
}
pub(crate) fn run_hook_post_chain(&self, output: &AnyOutput<C>) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(post_chain) = hook.post_chain {
post_chain(output)
}
}
}
pub(crate) fn run_hook_pre_render(&self, input: &C, raw: &dyn Any) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(pre_render) = hook.pre_render {
pre_render(input, raw)
}
}
}
pub(crate) fn run_hook_post_render(&self, result: &RenderResult) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(post_render) = hook.post_render {
post_render(result)
}
}
}
pub(crate) fn run_hook_exec_panic(&self, panic_info: &ProgramPanic) {
if !self.user_context.run_hook {
return;
}
for hook in &self.hooks {
if let Some(exec_panic) = hook.exec_panic {
exec_panic(panic_info)
}
}
}
pub(crate) fn run_hook_finish(&self) -> i32 {
if !self.user_context.run_hook {
return 0;
}
let mut exit_code = 0;
for hook in &self.hooks {
if let Some(finish) = hook.finish {
exit_code = finish();
if exit_code != 0 {
return exit_code;
}
}
}
exit_code
}
}
impl<C> ProgramHook<C>
where
C: ProgramCollect<Enum = C>,
{
/// Creates a new empty hook set with no handlers.
pub fn empty() -> Self {
Self {
begin: None,
pre_dispatch: None,
post_dispatch: None,
pre_chain: None,
post_chain: None,
pre_render: None,
post_render: None,
finish: None,
exec_panic: None,
}
}
/// Sets the handler for the `begin` event.
pub fn on_begin(mut self, handler: fn()) -> Self {
let _ = self.begin.insert(handler);
self
}
/// Sets the handler for the `pre_dispatch` event.
pub fn on_pre_dispatch(mut self, handler: fn(args: &Vec<String>)) -> Self {
let _ = self.pre_dispatch.insert(handler);
self
}
/// Sets the handler for the `post_dispatch` event.
pub fn on_post_dispatch(mut self, handler: fn(entry: &C)) -> Self {
let _ = self.post_dispatch.insert(handler);
self
}
/// Sets the handler for the `pre_chain` event.
pub fn on_pre_chain(mut self, handler: fn(input: &C, raw: &dyn Any)) -> Self {
let _ = self.pre_chain.insert(handler);
self
}
/// Sets the handler for the `post_chain` event.
pub fn on_post_chain(mut self, handler: fn(output: &AnyOutput<C>)) -> Self {
let _ = self.post_chain.insert(handler);
self
}
/// Sets the handler for the `pre_render` event.
pub fn on_pre_render(mut self, handler: fn(input: &C, raw: &dyn Any)) -> Self {
let _ = self.pre_render.insert(handler);
self
}
/// Sets the handler for the `post_render` event.
pub fn on_post_render(mut self, handler: fn(result: &RenderResult)) -> Self {
let _ = self.post_render.insert(handler);
self
}
/// Sets the handler for the `finish` event.
pub fn on_finish(mut self, handler: fn() -> i32) -> Self {
let _ = self.finish.insert(handler);
self
}
/// Sets the handler for the `exec_panic` event.
pub fn on_exec_panic(mut self, handler: fn(&ProgramPanic)) -> Self {
let _ = self.exec_panic.insert(handler);
self
}
}
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