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<p align="center">
> <img src="./.images/ink-squid.svg" alt="squink, the ink! mascot" style="vertical-align: middle" align="left" height="60" />`cargo-contract` is a CLI tool which helps you develop smart contracts in Parity's <a href="https://github.com/paritytech/ink">ink!</a>.<br/>ink! is a Rust [eDSL](https://wiki.haskell.org/Embedded_domain_specific_language) which allows you to write smart contracts for blockchains built on the [Substrate](https://github.com/paritytech/substrate) framework.
</p>
<br/>
[Guided Tutorial for Beginners](https://substrate.dev/substrate-contracts-workshop/#/0/building-your-contract) •
[ink! Documentation Portal](https://paritytech.github.io/ink-docs)
<br/>
</div>
More relevant links:
* Talk to us on [Element][b2] or [Discord][c2]
* [`ink!`](https://github.com/paritytech/ink) ‒ The main ink! repository with smart contract examples
* [Canvas UI](https://paritytech.github.io/canvas-ui/#/upload) ‒ Frontend for contract deployment and interaction
* [Canvas Node](https://github.com/paritytech/canvas-node) ‒ Simple Substrate blockchain which includes smart contract functionality
## Installation
* Step 1: `rustup component add rust-src`.
* Step 2: Install `binaryen` in a version >= 99:
* [Debian/Ubuntu](https://tracker.debian.org/pkg/binaryen): `apt-get install binaryen`
* [Homebrew](https://formulae.brew.sh/formula/binaryen): `brew install binaryen`
* [Arch Linux](https://archlinux.org/packages/community/x86_64/binaryen/): `pacman -S binaryen`
* Windows: [binary releases are available](https://github.com/WebAssembly/binaryen/releases)
There's only an old version in your distributions package manager? Just use a
[binary release](https://github.com/WebAssembly/binaryen/releases).
* Step 3: `cargo install --force cargo-contract`
## Usage
You can always use `cargo contract help` to print information on available
commands and their usage.
For each command there is also a `--help` flag with info on additional parameters,
e.g. `cargo contract new --help`.
##### `cargo contract new my_contract`
Creates an initial smart contract with some scaffolding code into a new
folder `my_contract` .
The contract contains the source code for the [`Flipper`](https://github.com/paritytech/ink/blob/master/examples/flipper/lib.rs)
contract, which is about the simplest "smart" contract you can build ‒ a `bool` which gets flipped
from `true` to `false` through the `flip()` function.
##### `cargo +nightly contract build`
Compiles the contract into optimized WebAssembly bytecode, generates metadata for it,
and bundles both together in a `<name>.contract` file, which you can use for
deploying the contract on-chain.
`cargo contract build` must be run using the `nightly` toolchain. If you have
[`rustup`](https://github.com/rust-lang/rustup) installed, the simplest way to
do so is `cargo +nightly contract build`.
To avoid having to always add `+nightly` you can also set `nightly` as the default
toolchain of a directory by executing `rustup override set nightly` in it.
##### `cargo contract check`
Checks that the code builds as WebAssembly. This command does not output any `<name>.contract`
artifact to the `target/` directory.
## License
The entire code within this repository is licensed under the [GPLv3](LICENSE).
Please [contact us](https://www.parity.io/contact/) if you have questions about
the licensing of our products.