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[![Latest Release][d1]][d2]
[![stack-exchange][s1]][s2]
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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://docs.substrate.io/tutorials/v3/ink-workshop/pt1/) •
[ink! Documentation Portal](https://ink.substrate.io)
<br/>
</div>
More relevant links:
* Find answers to your questions by joining our [Stack Exchange][s2] community
* [ink!](https://github.com/paritytech/ink) ‒ The main ink! repository with smart contract examples
* [Contracts UI](https://contracts-ui.substrate.io/) ‒ Frontend for contract deployment and interaction
* [Substrate Contracts Node](https://github.com/paritytech/substrate-contracts-node) ‒ Simple Substrate blockchain which includes smart contract functionality
## Installation
In addition to Rust, installation requires a C++ compiler that supports C++17.
Modern releases of gcc and clang, as well as Visual Studio 2019+ should work.
* Step 1: `rustup component add rust-src`.
* Step 2: `cargo install --force --locked cargo-contract`.
* Step 3: (**Optional**) Install `dylint` for linting.
* (MacOS) `brew install openssl`
* `cargo install cargo-dylint dylint-link`.
You can always update the `cargo-contract` binary to the latest version by running the Step 2.
### Installation using Docker Image
If you prefer to use Docker instead we have a Docker image
[available on the Docker Hub](https://hub.docker.com/r/paritytech/contracts-ci-linux):
```bash
# Pull the latest stable image.
docker pull paritytech/contracts-ci-linux:production
# Create a new contract in your current directory.
docker run --rm -it -v $(pwd):/sources paritytech/contracts-ci-linux:production \
cargo contract new --target-dir /sources my_contract
# Build the contract. This will create the contract file under
# `my_contract/target/ink/my_contract.contract`.
docker run --rm -it -v $(pwd):/sources paritytech/contracts-ci-linux:production \
cargo contract build --manifest-path=/sources/my_contract/Cargo.toml
```
If you want to reproduce other steps of CI process you can use the following
[guide](https://github.com/paritytech/scripts#reproduce-ci-locally).
## 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 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 check`
Checks that the code builds as WebAssembly. This command does not output any `<name>.contract`
artifact to the `target/` directory.
##### `cargo contract upload`
Upload a contract to a `pallet-contracts` enabled chain. See [extrinsics](docs/extrinsics.md).
##### `cargo contract instantiate`
Create an instance of a contract on chain. See [extrinsics](docs/extrinsics.md).
##### `cargo contract call`
Invoke a message on an existing contract on chain. See [extrinsics](docs/extrinsics.md).
##### `cargo contract decode`
Decodes a contracts input or output data.
This can be either an event, an invocation of a contract message, or an invocation of a contract constructor.
The argument has to be given as hex-encoding, starting with `0x`.
##### `cargo contract remove`
Remove a contract from a `pallet-contracts` enabled chain. See [extrinsics](docs/extrinsics.md).
##### `cargo contract info`
Fetch and display contract information of a contract on chain. See [info](docs/info.md).
## Publishing
In order to publish a new version of `cargo-contract`:
- Bump all crate versions, we move them in lockstep.
- Make sure your PR is approved by one or more core developers.
- Publish `metadata` ➜ `transcode` ➜ `build` ➜ `cargo-contract`.
- Merge you PR and push a tag `vX.X` with your version number.
- Create a GitHub release with the changelog entries.
## 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.