From 1cbcd244cbfc9cd4d32bed80f9e2754b2a74bb69 Mon Sep 17 00:00:00 2001
From: llama <gh@siid.sh>
Date: Wed, 24 Sep 2025 23:33:50 +0800
Subject: [PATCH] add support for `launcher` rustcfg to trim translations

---
 rslib/i18n/build.rs         | 16 +++++++++++++---
 rslib/i18n/src/generated.rs |  4 ++++
 rslib/i18n/write_strings.rs |  6 ++++--
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/rslib/i18n/build.rs b/rslib/i18n/build.rs
index 4baa6a709..8331ca9ec 100644
--- a/rslib/i18n/build.rs
+++ b/rslib/i18n/build.rs
@@ -23,10 +23,10 @@ use write_strings::write_strings;
 
 fn main() -> Result<()> {
     // generate our own requirements
-    let map = get_ftl_data();
+    let mut map = get_ftl_data();
     check(&map);
-    let modules = get_modules(&map);
-    write_strings(&map, &modules);
+    let mut modules = get_modules(&map);
+    write_strings(&map, &modules, "strings.rs");
 
     typescript::write_ts_interface(&modules)?;
     python::write_py_interface(&modules)?;
@@ -41,5 +41,15 @@ fn main() -> Result<()> {
             write_file_if_changed(path, meta_json)?;
         }
     }
+
+    // allow passing in "--cfg launcher" for the launcher
+    println!("cargo::rustc-check-cfg=cfg(launcher)");
+
+    // generate strings for the launcher
+    map.iter_mut()
+        .for_each(|(_, modules)| modules.retain(|module, _| module == "launcher"));
+    modules.retain(|module| module.name == "launcher");
+    write_strings(&map, &modules, "strings_launcher.rs");
+
     Ok(())
 }
diff --git a/rslib/i18n/src/generated.rs b/rslib/i18n/src/generated.rs
index f3fa71ce8..e9985e4bb 100644
--- a/rslib/i18n/src/generated.rs
+++ b/rslib/i18n/src/generated.rs
@@ -5,4 +5,8 @@
 
 #![allow(clippy::all)]
 
+#[cfg(not(launcher))]
 include!(concat!(env!("OUT_DIR"), "/strings.rs"));
+
+#[cfg(launcher)]
+include!(concat!(env!("OUT_DIR"), "/strings_launcher.rs"));
diff --git a/rslib/i18n/write_strings.rs b/rslib/i18n/write_strings.rs
index 33905d98f..04b0499a2 100644
--- a/rslib/i18n/write_strings.rs
+++ b/rslib/i18n/write_strings.rs
@@ -15,7 +15,7 @@ use crate::extract::VariableKind;
 use crate::gather::TranslationsByFile;
 use crate::gather::TranslationsByLang;
 
-pub fn write_strings(map: &TranslationsByLang, modules: &[Module]) {
+pub fn write_strings(map: &TranslationsByLang, modules: &[Module], out_fn: &str) {
     let mut buf = String::new();
 
     // lang->module map
@@ -28,14 +28,16 @@ pub fn write_strings(map: &TranslationsByLang, modules: &[Module]) {
     write_methods(modules, &mut buf);
 
     let dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
-    let path = dir.join("strings.rs");
+    let path = dir.join(out_fn);
     fs::write(path, buf).unwrap();
 }
 
 fn write_methods(modules: &[Module], buf: &mut String) {
     buf.push_str(
         r#"
+#[allow(unused_imports)]
 use crate::{I18n,Number};
+#[allow(unused_imports)]
 use fluent::{FluentValue, FluentArgs};
 use std::borrow::Cow;