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use std::io::stdin;
use std::io::stdout;
use std::str;
use protobuf::descriptor::FileDescriptorProto;
use protobuf::plugin::*;
use protobuf::Message;
use protobuf_parse::ProtoPathBuf;
pub struct GenRequest<'a> {
pub file_descriptors: &'a [FileDescriptorProto],
pub files_to_generate: &'a [ProtoPathBuf],
pub parameter: &'a str,
}
pub struct GenResult {
pub name: String,
pub content: Vec<u8>,
}
pub fn plugin_main<F>(gen: F) -> anyhow::Result<()>
where
F: Fn(&GenRequest) -> anyhow::Result<Vec<GenResult>>,
{
let req = CodeGeneratorRequest::parse_from_reader(&mut stdin()).unwrap();
let result = gen(&GenRequest {
file_descriptors: &req.proto_file,
files_to_generate: &req
.file_to_generate
.iter()
.map(|n| ProtoPathBuf::new(n.to_owned()))
.collect::<anyhow::Result<Vec<_>>>()?,
parameter: req.parameter(),
})?;
let mut resp = CodeGeneratorResponse::new();
resp.set_supported_features(code_generator_response::Feature::FEATURE_PROTO3_OPTIONAL as u64);
resp.file = result
.iter()
.map(|file| {
let mut r = code_generator_response::File::new();
r.set_name(file.name.to_string());
r.set_content(str::from_utf8(file.content.as_ref()).unwrap().to_string());
r
})
.collect();
resp.write_to_writer(&mut stdout()).unwrap();
Ok(())
}
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