Cargo merge

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.

Features

• 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

Examples

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

Install

Just run the following command:

cargo install cargo-merge

Usage

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.

Options

Long flag	Short flag	Description
-s	--silence-standard-error-output	Remove all the usages of eprint! and eprintln! macros from your code.

Credits

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.