Generated name override

Author: justsmth

src/callbacks.rs

@@ -31,6 +31,12 @@ pub trait ParseCallbacks: fmt::Debug + UnwindSafe {
         MacroParsingBehavior::Default
     }
 
+    /// This function will run for every function. The returned value determines the name visible
+    /// in the bindings.
+    fn generated_name_override(&self, _function_name: &str) -> Option<String> {
+        None
+    }
+
     /// The integer kind an integer macro should have, given a name and the
     /// value of that macro, or `None` if you want the default to be chosen.
     fn int_macro(&self, _name: &str, _value: i64) -> Option<IntKind> {

src/ir/function.rs

@@ -635,6 +635,12 @@ impl ClangSubItemParser for Function {
             // but seems easy enough to handle it here.
             name.push_str("_destructor");
         }
+        if let Some(callbacks) = context.parse_callbacks() {
+            if let Some(nm) = callbacks.generated_name_override(&name) {
+                name = nm;
+            }
+        }
+        assert!(!name.is_empty(), "Empty function name.");
 
         let mangled_name = cursor_mangling(context, &cursor);
         let comment = cursor.raw_comment();

tests/expectations/tests/issue-1375-prefixed-functions.rs

@@ -0,0 +1,4 @@
+// bindgen-parse-callbacks: remove-function-prefix-my_custom_prefix_
+
+void my_custom_prefix_function_name(const int x);
+

tests/headers/issue-1375-prefixed-functions.h

@@ -1,5 +1,29 @@
 use bindgen::callbacks::*;
 
+#[derive(Debug)]
+pub struct RemoveFunctionPrefixParseCallback {
+    pub remove_function_prefix: Option<String>,
+}
+
+impl RemoveFunctionPrefixParseCallback {
+    pub fn new(prefix: &str) -> Self {
+        RemoveFunctionPrefixParseCallback {
+            remove_function_prefix: Some(prefix.to_string()),
+        }
+    }
+}
+
+impl ParseCallbacks for RemoveFunctionPrefixParseCallback {
+    fn generated_name_override(&self, function_name: &str) -> Option<String> {
+        if let Some(prefix) = &self.remove_function_prefix {
+            if function_name.starts_with(prefix) {
+                return Some(function_name[prefix.len()..].to_string());
+            }
+        }
+        None
+    }
+}
+
 #[derive(Debug)]
 struct EnumVariantRename;
 
@@ -37,6 +61,18 @@ pub fn lookup(cb: &str) -> Box<dyn ParseCallbacks> {
         "blocklisted-type-implements-trait" => {
             Box::new(BlocklistedTypeImplementsTrait)
         }
-        _ => panic!("Couldn't find name ParseCallbacks: {}", cb),
+        call_back => {
+            if call_back.starts_with("remove-function-prefix-") {
+                let prefix = call_back
+                    .split("remove-function-prefix-")
+                    .last()
+                    .to_owned();
+                let lnopc =
+                    RemoveFunctionPrefixParseCallback::new(prefix.unwrap());
+                Box::new(lnopc)
+            } else {
+                panic!("Couldn't find name ParseCallbacks: {}", cb)
+            }
+        }
     }
 }