A cargo subcommand that merges your crate source code into a single file.

The initial purpose of this command is to merge your whole crate as a single source file that can be used on competitive programming platforms.

It works by expanding module imports by detecting them with regex, rewriting some "use" statements in the process.

• merge the library crate of the package
• merge modules from the main binary crate of the package
• merge external crates
  • path based crates (crates that are declared as dependencies like this : my-crate = { path = "path/to/crate" } )
• silence the standard error output by cleansing source code from eprint! and eprintln! macros

Working basic examples can be found in the integration tests data.

Just run the following command:

cargo install cargo-merge

Simply call the cargo sub command inside your crate folder hierarchy (it can be any folder below the one containing your Cargo.toml file):

cargo merge

This will generate a merged file in target/merge/merged.rs.

This little project is heavily inspired by rust-sourcebundler. It has the same approach and has the same goal, but I find the cargo subcommand approach less intrusive. Also, I'll hopefully also maintain this project actively.