Add copy_file to anki_io, and ensure strings parent folder is created

rslib/i18n/build/main.rs

@@ -6,6 +6,9 @@ mod extract;
 mod gather;
 mod write_strings;
 
+use std::path::Path;
+
+use anki_io::create_dir_all;
 use anki_io::write_file_if_changed;
 use anyhow::Result;
 use check::check;
@@ -26,6 +29,7 @@ fn main() -> Result<()> {
     println!("cargo:rerun-if-env-changed=STRINGS_JSON");
     if let Some(path) = option_env!("STRINGS_JSON") {
         let meta_json = serde_json::to_string_pretty(&modules).unwrap();
+        create_dir_all(Path::new(path).parent().unwrap())?;
         write_file_if_changed(path, meta_json)?;
     }
     Ok(())

rslib/io/src/lib.rs

@@ -83,6 +83,14 @@ pub fn read_to_string(path: impl AsRef<Path>) -> Result<String> {
     })
 }
 
+/// See [std::fs::copy].
+pub fn copy_file(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> Result<u64> {
+    std::fs::copy(&src, &dst).context(FileIoSnafu {
+        path: dst.as_ref(),
+        op: FileOp::CopyFrom(src.as_ref().to_owned()),
+    })
+}
+
 /// Like [read_file], but skips the section that is potentially locked by
 /// SQLite.
 pub fn read_locked_db_file(path: impl AsRef<Path>) -> Result<Vec<u8>> {