1 files changed, 48 insertions, 0 deletions
diff --git a/src/compiler_plugin.rs b/src/compiler_plugin.rs
new file mode 100644
index 0000000..b7ff6ea
--- /dev/null
+++ b/src/compiler_plugin.rs
@@ -0,0 +1,48 @@
+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(())
+}