aconfig: move codegen into separate module

Consolidate the code generation sources into its own module. This is
done in preparation for when support for the new flag storage will be
added, which should also be placed in a separate module.

Bug: N/A
Test: atest aconfig.test aconfig.test.java
Change-Id: I8246729218ec60f2af4568c460e98329665a89fa

tools/aconfig/src/codegen/cpp.rs

@@ -56,12 +56,12 @@ where
     let files = [
         FileSpec {
             name: &format!("{}.h", header),
-            template: include_str!("../templates/cpp_exported_header.template"),
+            template: include_str!("../../templates/cpp_exported_header.template"),
             dir: "include",
         },
         FileSpec {
             name: &format!("{}.cc", header),
-            template: include_str!("../templates/cpp_source_file.template"),
+            template: include_str!("../../templates/cpp_source_file.template"),
             dir: "",
         },
     ];

tools/aconfig/src/codegen/java.rs

@@ -50,18 +50,18 @@ where
         library_exported,
     };
     let mut template = TinyTemplate::new();
-    template.add_template("Flags.java", include_str!("../templates/Flags.java.template"))?;
+    template.add_template("Flags.java", include_str!("../../templates/Flags.java.template"))?;
     template.add_template(
         "FeatureFlagsImpl.java",
-        include_str!("../templates/FeatureFlagsImpl.java.template"),
+        include_str!("../../templates/FeatureFlagsImpl.java.template"),
     )?;
     template.add_template(
         "FeatureFlags.java",
-        include_str!("../templates/FeatureFlags.java.template"),
+        include_str!("../../templates/FeatureFlags.java.template"),
     )?;
     template.add_template(
         "FakeFeatureFlagsImpl.java",
-        include_str!("../templates/FakeFeatureFlagsImpl.java.template"),
+        include_str!("../../templates/FakeFeatureFlagsImpl.java.template"),
     )?;
 
     let path: PathBuf = package.split('.').collect();

tools/aconfig/src/codegen/mod.rs

@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+pub mod cpp;
+pub mod java;
+pub mod rust;
+
 use anyhow::{ensure, Result};
 
 pub fn is_valid_name_ident(s: &str) -> bool {

tools/aconfig/src/codegen/rust.rs

@@ -43,8 +43,8 @@ where
     template.add_template(
         "rust_code_gen",
         match codegen_mode {
-            CodegenMode::Production => include_str!("../templates/rust_prod.template"),
-            CodegenMode::Test => include_str!("../templates/rust_test.template"),
+            CodegenMode::Production => include_str!("../../templates/rust_prod.template"),
+            CodegenMode::Test => include_str!("../../templates/rust_test.template"),
             CodegenMode::Exported => {
                 todo!("exported mode not yet supported for rust, see b/313894653.")
             }

tools/aconfig/src/commands.rs

@@ -20,9 +20,9 @@ use protobuf::Message;
 use std::io::Read;
 use std::path::PathBuf;
 
-use crate::codegen_cpp::generate_cpp_code;
-use crate::codegen_java::generate_java_code;
-use crate::codegen_rust::generate_rust_code;
+use crate::codegen::cpp::generate_cpp_code;
+use crate::codegen::java::generate_java_code;
+use crate::codegen::rust::generate_rust_code;
 use crate::protos::{
     ProtoFlagMetadata, ProtoFlagPermission, ProtoFlagState, ProtoParsedFlag, ProtoParsedFlags,
     ProtoTracepoint,

tools/aconfig/src/main.rs

@@ -25,9 +25,6 @@ use std::io::Write;
 use std::path::{Path, PathBuf};
 
 mod codegen;
-mod codegen_cpp;
-mod codegen_java;
-mod codegen_rust;
 mod commands;
 mod protos;