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#![deny(
missing_docs,
rust_2018_idioms,
unused,
unused_import_braces,
unused_lifetimes,
unused_qualifications,
warnings,
)]
use {
proc_macro::TokenStream,
proc_macro2::Span,
quote::quote,
syn::{
AttributeArgs,
Ident,
ItemFn,
Lit,
Meta,
MetaNameValue,
NestedMeta,
parse_macro_input,
},
};
#[proc_macro_attribute]
pub fn command(_: TokenStream, item: TokenStream) -> TokenStream {
let command_fn = parse_macro_input!(item as ItemFn);
let asyncness = &command_fn.sig.asyncness;
let command_name = &command_fn.sig.ident;
let command_name_str = command_name.to_string();
let wrapper_name = Ident::new(&format!("{}_wrapper", command_name), Span::call_site());
let awaitness = asyncness.as_ref().map(|_| quote!(.await));
let wrapper_body = quote! {
::bitbar::CommandOutput::report(#command_name(args.into_iter())#awaitness, #command_name_str);
};
#[cfg(not(any(feature = "tokio", feature = "tokio02")))] let (wrapper_ret, wrapper_body) = (quote!(), wrapper_body);
#[cfg(any(feature = "tokio", feature = "tokio02"))] let (wrapper_ret, wrapper_body) = (
quote!(-> ::std::pin::Pin<::std::boxed::Box<dyn ::std::future::Future<Output = ()>>>),
quote!(::std::boxed::Box::pin(async move { #wrapper_body })),
);
TokenStream::from(quote! {
fn #wrapper_name(program: ::std::ffi::OsString, args: Vec<::std::ffi::OsString>) #wrapper_ret {
#command_fn
#wrapper_body
}
inventory::submit! {
Subcommand {
name: #command_name_str,
func: #wrapper_name,
}
}
})
}
#[proc_macro_attribute]
pub fn fallback_command(_: TokenStream, item: TokenStream) -> TokenStream {
let fallback_fn = parse_macro_input!(item as ItemFn);
let asyncness = &fallback_fn.sig.asyncness;
let fn_name = &fallback_fn.sig.ident;
let wrapper_name = Ident::new(&format!("{}_wrapper", fn_name), Span::call_site());
let awaitness = asyncness.as_ref().map(|_| quote!(.await));
let wrapper_body = quote! {
let first_arg = args.first().expect("missing subcommand to report on").to_str().unwrap_or("<invalid UTF-8>").to_owned();
::bitbar::CommandOutput::report(#fn_name(cmd, args.into_iter())#awaitness, &first_arg);
};
#[cfg(not(any(feature = "tokio", feature = "tokio02")))] let (wrapper_ret, wrapper_body) = (quote!(), wrapper_body);
#[cfg(any(feature = "tokio", feature = "tokio02"))] let (wrapper_ret, wrapper_body) = (
quote!(-> ::std::pin::Pin<::std::boxed::Box<dyn ::std::future::Future<Output = ()>>>),
quote!(::std::boxed::Box::pin(async move { #wrapper_body })),
);
TokenStream::from(quote! {
fn #wrapper_name(cmd: ::std::ffi::OsString, args: Vec<::std::ffi::OsString>) #wrapper_ret {
#fallback_fn
#wrapper_body
}
inventory::submit! { Fallback(#wrapper_name) }
})
}
#[proc_macro_attribute]
pub fn main(args: TokenStream, item: TokenStream) -> TokenStream {
let args = parse_macro_input!(args as AttributeArgs);
let error_template_image = match &args[..] {
[] => quote!(::core::option::Option::None),
[NestedMeta::Meta(Meta::NameValue(MetaNameValue { path, lit: Lit::Str(path_lit), ..}))]
if path.get_ident().map_or(false, |arg| arg.to_string() == "error_template_image") => {
quote!(::core::option::Option::Some(::bitbar::attr::Image::from(&include_bytes!(#path_lit)[..])))
}
_ => return TokenStream::from(quote!(compile_error!("unexpected bitbar::main arguments"))),
};
let main_fn = parse_macro_input!(item as ItemFn);
let asyncness = &main_fn.sig.asyncness;
let awaitness = asyncness.as_ref().map(|_| quote!(.await));
let inner_params = &main_fn.sig.inputs;
let inner_args = if inner_params.len() >= 1 {
quote!(::bitbar::Flavor::check())
} else {
quote!()
};
#[cfg(not(any(feature = "tokio", feature = "tokio02")))] let (cmd_ret, cmd_awaitness) = (quote!(), quote!());
#[cfg(any(feature = "tokio", feature = "tokio02"))] let (cmd_ret, cmd_awaitness) = (
quote!(-> ::std::pin::Pin<::std::boxed::Box<dyn ::std::future::Future<Output = ()>>>),
quote!(.await),
);
let wrapper_body = quote!({
let mut args = ::std::env::args_os();
let program = args.next().expect("missing program name");
if let ::core::option::Option::Some(subcommand) = args.next() {
let subcommand_str = subcommand.to_str().unwrap_or_else(|| {
::bitbar::notify("subcommand is not valid UTF-8");
::std::process::exit(1)
});
if let ::core::option::Option::Some(command) = inventory::iter::<Subcommand>.into_iter().find(|command| command.name == subcommand_str) {
(command.func)(program, args.collect())#cmd_awaitness;
} else if let ::core::option::Option::Some(Fallback(fallback)) = inventory::iter::<Fallback>.into_iter().next() {
fallback(subcommand, args.collect())#cmd_awaitness;
} else {
::bitbar::notify(format!("no such subcommand: {}", subcommand_str));
::std::process::exit(1)
}
} else {
print!("{}", ::bitbar::MainOutput::main_output(main_inner(#inner_args)#awaitness, #error_template_image));
}
});
#[cfg(feature = "tokio02")] let wrapper_body = quote!({
::bitbar::tokio::runtime::Builder::new()
.threaded_scheduler()
.enable_all()
.build()
.unwrap()
.block_on(async #wrapper_body)
});
#[cfg(feature = "tokio")] let wrapper_body = quote!({
::bitbar::tokio::runtime::Builder::new_multi_thread()
.enable_all()
.build()
.unwrap()
.block_on(async #wrapper_body)
});
let ret = main_fn.sig.output;
let inner_body = main_fn.block;
TokenStream::from(quote! {
use ::bitbar::inventory;
struct Subcommand {
name: &'static str,
func: fn(::std::ffi::OsString, Vec<::std::ffi::OsString>) #cmd_ret,
}
inventory::collect!(Subcommand);
struct Fallback(fn(::std::ffi::OsString, Vec<::std::ffi::OsString>) #cmd_ret);
inventory::collect!(Fallback);
#asyncness fn main_inner(#inner_params) #ret #inner_body
fn main() #wrapper_body
})
}