1 files changed, 52 insertions, 0 deletions
diff --git a/third_party/rust/bindgen/options/as_args.rs b/third_party/rust/bindgen/options/as_args.rs
new file mode 100644
index 0000000000..6918ad9fec
--- /dev/null
+++ b/third_party/rust/bindgen/options/as_args.rs
@@ -0,0 +1,52 @@
+use std::path::PathBuf;
+
+use crate::RegexSet;
+
+/// Trait used to turn [`crate::BindgenOptions`] fields into CLI args.
+pub(super) trait AsArgs {
+    fn as_args(&self, args: &mut Vec<String>, flag: &str);
+}
+
+/// If the `bool` is `true`, `flag` is pushed into `args`.
+///
+/// be careful about the truth value of the field as some options, like `--no-layout-tests`, are
+/// actually negations of the fields.
+impl AsArgs for bool {
+    fn as_args(&self, args: &mut Vec<String>, flag: &str) {
+        if *self {
+            args.push(flag.to_string());
+        }
+    }
+}
+
+/// Iterate over all the items of the `RegexSet` and push `flag` followed by the item into `args`
+/// for each item.
+impl AsArgs for RegexSet {
+    fn as_args(&self, args: &mut Vec<String>, flag: &str) {
+        for item in self.get_items() {
+            args.extend_from_slice(&[flag.to_owned(), item.clone().into()]);
+        }
+    }
+}
+
+/// If the `Option` is `Some(value)`, push `flag` followed by `value`.
+impl AsArgs for Option<String> {
+    fn as_args(&self, args: &mut Vec<String>, flag: &str) {
+        if let Some(string) = self {
+            args.extend_from_slice(&[flag.to_owned(), string.clone()]);
+        }
+    }
+}
+
+/// If the `Option` is `Some(path)`, push `flag` followed by the [`std::path::Path::display`]
+/// representation of `path`.
+impl AsArgs for Option<PathBuf> {
+    fn as_args(&self, args: &mut Vec<String>, flag: &str) {
+        if let Some(path) = self {
+            args.extend_from_slice(&[
+                flag.to_owned(),
+                path.display().to_string(),
+            ]);
+        }
+    }
+}