Tracking a function in a source code file includes determining an author of an initial version of the source code file, and generating a data structure for one or more functions in the initial version. The determined author is associated as a function author of the one or more functions. In response to a new version of the source code file being committed, one or more added or changed functions are identified, and an author of the new version of the source code file is determined. The data structure for each changed function is updated to associate the author of the new version of the source code file as the function author for a new version of the changed function, and a new data structure is generated for each added function associating the author of the new version as a function author of the added function.