The tool has a number of handy capabilities:
$ cargo contract
Utilities to develop Wasm smart contracts
Usage: cargo contract <COMMAND>
new Setup and create a new smart contract project
build Compiles the contract, generates metadata, bundles both together in a `<name>.contract` file
check Check that the code builds as Wasm; does not output any `<name>.contract` artifact to the `target/` directory
test Test the smart contract off-chain
upload Upload contract code
instantiate Instantiate a contract
call Call a contract
decode Decodes a contracts input or output data (supplied in hex-encoding)
help Print this message or the help of the given subcommand(s)
-h, --help Print help information
-V, --version Print version information
Please see the installation instructions in the
cargo-contract repository here.
You can then use
cargo contract --help to start exploring the commands made available to you.
In order to initialize a new ink! project you can use:
cargo contract new flipper
This will create a folder
flipper in your work directory.
The folder contains a scaffold
Cargo.toml and a
lib.rs, which both contain the necessary building blocks for using ink!.
lib.rs contains our hello world contract ‒ the
Flipper, which we explain in the next section.
In order to build the contract just execute these commands in the
cargo contract build
As a result you'll get the file
target/flipper.contract. It's a JSON which bundles the contract's
metadata and its Wasm blob. This file needs to be used when deploying the contract.
You additionally get the individual
target/metadata.json in the folder as well.