auto_enums 0.8.8

A library for to allow multiple return types by automatically generated enum.
Documentation 
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// SPDX-License-Identifier: Apache-2.0 OR MIT

pub(crate) mod read {
    use crate::derive::prelude::*;

    pub(crate) const NAME: &[&str] = &["Read", "io::Read"];

    pub(crate) fn derive(_cx: &Context, data: &Data) -> Result<TokenStream> {
        // TODO: Add is_read_vectored once stabilized https://github.com/rust-lang/rust/issues/69941
        // TODO: Add read_buf,read_buf_exact once stabilized https://github.com/rust-lang/rust/issues/78485
        Ok(derive_trait(data, &parse_quote!(::std::io::Read), None, parse_quote! {
            trait Read {
                #[inline]
                fn read(&mut self, buf: &mut [u8]) -> ::std::io::Result<usize>;
                #[inline]
                fn read_vectored(
                    &mut self,
                    bufs: &mut [::std::io::IoSliceMut<'_>],
                ) -> ::std::io::Result<usize>;
                #[inline]
                fn read_to_end(
                    &mut self,
                    buf: &mut ::std::vec::Vec<u8>,
                ) -> ::std::io::Result<usize>;
                #[inline]
                fn read_to_string(
                    &mut self,
                    buf: &mut ::std::string::String,
                ) -> ::std::io::Result<usize>;
                #[inline]
                fn read_exact(&mut self, buf: &mut [u8]) -> ::std::io::Result<()>;
            }
        }))
    }
}

pub(crate) mod write {
    use crate::derive::prelude::*;

    pub(crate) const NAME: &[&str] = &["Write", "io::Write"];

    pub(crate) fn derive(_cx: &Context, data: &Data) -> Result<TokenStream> {
        // TODO: Add is_write_vectored once stabilized https://github.com/rust-lang/rust/issues/69941
        // TODO: Add write_all_vectored once stabilized https://github.com/rust-lang/rust/issues/70436
        Ok(derive_trait(data, &parse_quote!(::std::io::Write), None, parse_quote! {
            trait Write {
                #[inline]
                fn write(&mut self, buf: &[u8]) -> ::std::io::Result<usize>;
                #[inline]
                fn write_vectored(
                    &mut self,
                    bufs: &[::std::io::IoSlice<'_>],
                ) -> ::std::io::Result<usize>;
                #[inline]
                fn flush(&mut self) -> ::std::io::Result<()>;
                #[inline]
                fn write_all(&mut self, buf: &[u8]) -> ::std::io::Result<()>;
                #[inline]
                fn write_fmt(
                    &mut self,
                    fmt: ::std::fmt::Arguments<'_>,
                ) -> ::std::io::Result<()>;
            }
        }))
    }
}

pub(crate) mod seek {
    use crate::derive::prelude::*;

    pub(crate) const NAME: &[&str] = &["Seek", "io::Seek"];

    pub(crate) fn derive(_cx: &Context, data: &Data) -> Result<TokenStream> {
        Ok(derive_trait(data, &parse_quote!(::std::io::Seek), None, parse_quote! {
            trait Seek {
                #[inline]
                fn seek(&mut self, pos: ::std::io::SeekFrom) -> ::std::io::Result<u64>;
            }
        }))
    }
}

pub(crate) mod buf_read {
    use crate::derive::prelude::*;

    pub(crate) const NAME: &[&str] = &["BufRead", "io::BufRead"];

    pub(crate) fn derive(_cx: &Context, data: &Data) -> Result<TokenStream> {
        Ok(derive_trait(data, &parse_quote!(::std::io::BufRead), None, parse_quote! {
            trait BufRead {
                #[inline]
                fn fill_buf(&mut self) -> ::std::io::Result<&[u8]>;
                #[inline]
                fn consume(&mut self, amt: usize);
                #[inline]
                fn read_until(
                    &mut self,
                    byte: u8, buf: &mut ::std::vec::Vec<u8>,
                ) -> ::std::io::Result<usize>;
                #[inline]
                fn read_line(
                    &mut self,
                    buf: &mut ::std::string::String,
                ) -> ::std::io::Result<usize>;
            }
        }))
    }
}