chore(vendor): add anyhow crate

third_party/crates/clap_derive-4.6.7/src/lib.rs

@@ -0,0 +1,118 @@
+// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>,
+// Kevin Knapp (@kbknapp) <kbknapp@gmail.com>, and
+// Ana Hobden (@hoverbear) <operator@hoverbear.org>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+//
+// This work was derived from Structopt (https://github.com/TeXitoi/structopt)
+// commit#ea76fa1b1b273e65e3b0b1046643715b49bec51f which is licensed under the
+// MIT/Apache 2.0 license.
+
+#![doc = include_str!("../README.md")]
+#![doc(html_logo_url = "https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png")]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+#![forbid(unsafe_code)]
+#![warn(missing_docs)]
+#![warn(clippy::print_stderr)]
+#![warn(clippy::print_stdout)]
+
+use proc_macro::TokenStream;
+use syn::{Data, DataStruct, Fields};
+use syn::{DeriveInput, parse_macro_input};
+
+#[macro_use]
+mod macros;
+
+mod attr;
+mod derives;
+mod dummies;
+mod item;
+mod utils;
+
+/// Generates the `ValueEnum` impl.
+#[proc_macro_derive(ValueEnum, attributes(clap, value))]
+pub fn value_enum(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = parse_macro_input!(input);
+    derives::derive_value_enum(&input)
+        .unwrap_or_else(|err| {
+            let dummy = dummies::value_enum(&input.ident);
+            to_compile_error(err, dummy)
+        })
+        .into()
+}
+
+/// Generates the `Parser` implementation.
+///
+/// This is far less verbose than defining the `clap::Command` struct manually,
+/// receiving an instance of `clap::ArgMatches` from conducting parsing, and then
+/// implementing a conversion code to instantiate an instance of the user
+/// context struct.
+#[proc_macro_derive(Parser, attributes(clap, structopt, command, arg, group))]
+pub fn parser(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = parse_macro_input!(input);
+    derives::derive_parser(&input)
+        .unwrap_or_else(|err| {
+            let specific_dummy = match input.data {
+                Data::Struct(DataStruct {
+                    fields: Fields::Named(ref _fields),
+                    ..
+                }) => Some(dummies::args(&input.ident)),
+                Data::Struct(DataStruct {
+                    fields: Fields::Unit,
+                    ..
+                }) => Some(dummies::args(&input.ident)),
+                Data::Enum(_) => Some(dummies::subcommand(&input.ident)),
+                _ => None,
+            };
+            let dummy = specific_dummy
+                .map(|specific_dummy| {
+                    let parser_dummy = dummies::parser(&input.ident);
+                    quote::quote! {
+                        #parser_dummy
+                        #specific_dummy
+                    }
+                })
+                .unwrap_or_else(|| quote::quote!());
+            to_compile_error(err, dummy)
+        })
+        .into()
+}
+
+/// Generates the `Subcommand` impl.
+#[proc_macro_derive(Subcommand, attributes(clap, command, arg, group))]
+pub fn subcommand(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = parse_macro_input!(input);
+    derives::derive_subcommand(&input)
+        .unwrap_or_else(|err| {
+            let dummy = dummies::subcommand(&input.ident);
+            to_compile_error(err, dummy)
+        })
+        .into()
+}
+
+/// Generates the `Args` impl.
+#[proc_macro_derive(Args, attributes(clap, command, arg, group))]
+pub fn args(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = parse_macro_input!(input);
+    derives::derive_args(&input)
+        .unwrap_or_else(|err| {
+            let dummy = dummies::args(&input.ident);
+            to_compile_error(err, dummy)
+        })
+        .into()
+}
+
+fn to_compile_error(
+    error: syn::Error,
+    dummy: proc_macro2::TokenStream,
+) -> proc_macro2::TokenStream {
+    let compile_errors = error.to_compile_error();
+    quote::quote!(
+        #dummy
+        #compile_errors
+    )
+}