first commit

Author: Kanthub

.github/workflows/test.yml

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+name: CI
+
+permissions:
+    contents: read
+
+on:
+    push:
+    pull_request:
+    workflow_dispatch:
+
+env:
+    FOUNDRY_PROFILE: ci
+
+jobs:
+    check:
+        name: Foundry project
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v5
+              with:
+                  persist-credentials: false
+                  submodules: recursive
+
+            - name: Install Foundry
+              uses: foundry-rs/foundry-toolchain@v1
+
+            - name: Show Forge version
+              run: forge --version
+
+            - name: Run Forge fmt
+              run: forge fmt --check
+
+            - name: Run Forge build
+              run: forge build --sizes
+
+            - name: Run Forge tests
+              run: forge test -vvv

.gitignore

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+# Compiler files
+cache/
+out/
+
+# Ignores development broadcast logs
+!/broadcast
+/broadcast/*/31337/
+/broadcast/**/dry-run/
+
+# Docs
+docs/
+
+# Dotenv file
+.env

.gitmodules

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+[submodule "lib/forge-std"]
+	path = lib/forge-std
+	url = https://github.com/foundry-rs/forge-std

.prettierrc

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+{
+    "printWidth": 500,
+    "tabWidth": 4,
+    "overrides": [
+        {
+            "files": "*.sol",
+            "options": {
+                "printWidth": 500
+            }
+        }
+    ]
+}

README.md

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+## Foundry
+
+**Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.**
+
+Foundry consists of:
+
+-   **Forge**: Ethereum testing framework (like Truffle, Hardhat and DappTools).
+-   **Cast**: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
+-   **Anvil**: Local Ethereum node, akin to Ganache, Hardhat Network.
+-   **Chisel**: Fast, utilitarian, and verbose solidity REPL.
+
+## Documentation
+
+https://book.getfoundry.sh/
+
+## Usage
+
+### Build
+
+```shell
+$ forge build
+```
+
+### Test
+
+```shell
+$ forge test
+```
+
+### Format
+
+```shell
+$ forge fmt
+```
+
+### Gas Snapshots
+
+```shell
+$ forge snapshot
+```
+
+### Anvil
+
+```shell
+$ anvil
+```
+
+### Deploy
+
+```shell
+$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>
+```
+
+### Cast
+
+```shell
+$ cast <subcommand>
+```
+
+### Help
+
+```shell
+$ forge --help
+$ anvil --help
+$ cast --help
+```

RootHashSwapERC20.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "../interfaces/IRootHashSwapERC20.sol";
+
+contract RootHashSwapERC20 is IRootHashSwapERC20 {
+    string public constant name = "RootHashSwap V2";
+    string public constant symbol = "UNI-V2";
+    uint8 public constant decimals = 18;
+    uint256 public totalSupply;
+    mapping(address => uint256) public balanceOf;
+    mapping(address => mapping(address => uint256)) public allowance;
+
+    bytes32 public DOMAIN_SEPARATOR;
+    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
+    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
+    mapping(address => uint256) public nonces;
+
+    constructor() {
+        uint256 chainId;
+        chainId = block.chainid;
+        DOMAIN_SEPARATOR = keccak256(abi.encode(keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), keccak256(bytes(name)), keccak256(bytes("1")), chainId, address(this)));
+    }
+
+    function _mint(address to, uint256 value) internal {
+        totalSupply += value;
+        balanceOf[to] += value;
+        emit Transfer(address(0), to, value);
+    }
+
+    function _burn(address from, uint256 value) internal {
+        balanceOf[from] -= value;
+        totalSupply -= value;
+        emit Transfer(from, address(0), value);
+    }
+
+    function _approve(address owner, address spender, uint256 value) private {
+        allowance[owner][spender] = value;
+        emit Approval(owner, spender, value);
+    }
+
+    function _transfer(address from, address to, uint256 value) private {
+        balanceOf[from] -= value;
+        balanceOf[to] += value;
+        emit Transfer(from, to, value);
+    }
+
+    function approve(address spender, uint256 value) external returns (bool) {
+        _approve(msg.sender, spender, value);
+        return true;
+    }
+
+    function transfer(address to, uint256 value) external returns (bool) {
+        _transfer(msg.sender, to, value);
+        return true;
+    }
+
+    function transferFrom(address from, address to, uint256 value) external returns (bool) {
+        if (allowance[from][msg.sender] != type(uint256).max) {
+            allowance[from][msg.sender] -= value;
+        }
+        _transfer(from, to, value);
+        return true;
+    }
+
+    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external {
+        require(deadline >= block.timestamp, "RootHashSwap: EXPIRED");
+        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))));
+        address recoveredAddress = ecrecover(digest, v, r, s);
+        require(recoveredAddress != address(0) && recoveredAddress == owner, "RootHashSwap: INVALID_SIGNATURE");
+        _approve(owner, spender, value);
+    }
+}

foundry.lock

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+{
+  "lib/forge-std": {
+    "tag": {
+      "name": "v1.11.0",
+      "rev": "8e40513d678f392f398620b3ef2b418648b33e89"
+    }
+  }
+}

foundry.toml

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+[profile.default]
+src = "src"
+out = "out"
+libs = ["lib"]
+
+# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
+solc = "0.8.22"
+# https://github.com/OpenZeppelin/openzeppelin-foundry-upgrades
+ffi = true
+ast = true
+build_info = true
+extra_output = ["storageLayout"]
+fs_permissions = [{ access = "read-write", path = "./"}]
+
+[rpc_endpoints]
+sepolia = "${SEPOLIA_RPC_URL}"
+
+[fmt]
+line_length = 500
+tab_width = 4
+