1 files changed, 119 insertions, 0 deletions
diff --git a/vendor/clap_derive/src/derives/parser.rs b/vendor/clap_derive/src/derives/parser.rs
new file mode 100644
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+++ b/vendor/clap_derive/src/derives/parser.rs
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+// 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.
+
+use proc_macro2::TokenStream;
+use quote::quote;
+use syn::Ident;
+use syn::Variant;
+use syn::{
+    self, punctuated::Punctuated, token::Comma, Data, DataStruct, DeriveInput, Field, Fields,
+    Generics,
+};
+
+use crate::derives::args::collect_args_fields;
+use crate::derives::{args, into_app, subcommand};
+use crate::item::Item;
+use crate::item::Name;
+
+pub fn derive_parser(input: &DeriveInput) -> Result<TokenStream, syn::Error> {
+    let ident = &input.ident;
+    let pkg_name = std::env::var("CARGO_PKG_NAME").ok().unwrap_or_default();
+
+    match input.data {
+        Data::Struct(DataStruct {
+            fields: Fields::Named(ref fields),
+            ..
+        }) => {
+            let name = Name::Assigned(quote!(#pkg_name));
+            let item = Item::from_args_struct(input, name)?;
+            let fields = collect_args_fields(&item, fields)?;
+            gen_for_struct(&item, ident, &input.generics, &fields)
+        }
+        Data::Struct(DataStruct {
+            fields: Fields::Unit,
+            ..
+        }) => {
+            let name = Name::Assigned(quote!(#pkg_name));
+            let item = Item::from_args_struct(input, name)?;
+            let fields = Punctuated::<Field, Comma>::new();
+            let fields = fields
+                .iter()
+                .map(|field| {
+                    let item = Item::from_args_field(field, item.casing(), item.env_casing())?;
+                    Ok((field, item))
+                })
+                .collect::<Result<Vec<_>, syn::Error>>()?;
+            gen_for_struct(&item, ident, &input.generics, &fields)
+        }
+        Data::Enum(ref e) => {
+            let name = Name::Assigned(quote!(#pkg_name));
+            let item = Item::from_subcommand_enum(input, name)?;
+            let variants = e
+                .variants
+                .iter()
+                .map(|variant| {
+                    let item =
+                        Item::from_subcommand_variant(variant, item.casing(), item.env_casing())?;
+                    Ok((variant, item))
+                })
+                .collect::<Result<Vec<_>, syn::Error>>()?;
+            gen_for_enum(&item, ident, &input.generics, &variants)
+        }
+        _ => abort_call_site!("`#[derive(Parser)]` only supports non-tuple structs and enums"),
+    }
+}
+
+fn gen_for_struct(
+    item: &Item,
+    item_name: &Ident,
+    generics: &Generics,
+    fields: &[(&Field, Item)],
+) -> Result<TokenStream, syn::Error> {
+    let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
+
+    let into_app = into_app::gen_for_struct(item, item_name, generics)?;
+    let args = args::gen_for_struct(item, item_name, generics, fields)?;
+
+    Ok(quote! {
+        #[automatically_derived]
+        #[allow(
+            unused_qualifications,
+            clippy::redundant_locals,
+        )]
+        impl #impl_generics clap::Parser for #item_name #ty_generics #where_clause {}
+
+        #into_app
+        #args
+    })
+}
+
+fn gen_for_enum(
+    item: &Item,
+    item_name: &Ident,
+    generics: &Generics,
+    variants: &[(&Variant, Item)],
+) -> Result<TokenStream, syn::Error> {
+    let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
+
+    let into_app = into_app::gen_for_enum(item, item_name, generics)?;
+    let subcommand = subcommand::gen_for_enum(item, item_name, generics, variants)?;
+
+    Ok(quote! {
+        #[automatically_derived]
+        impl #impl_generics clap::Parser for #item_name #ty_generics #where_clause {}
+
+        #into_app
+        #subcommand
+    })
+}