migrate to hardhat (#121)

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+name: CI
+
+on:
+  push:
+    branches: 
+      - master
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: '12'
+
+      # Restore the yarn cache
+      - uses: c-hive/gha-yarn-cache@v1
+
+      - name: Yarn install
+        run: yarn install
+
+      - name: Linter
+        run: yarn lint
+
+      - name: Compile
+        run: yarn compile
+
+      - name: Test
+        run: yarn test
+
+      - name: Coverage
+        run: yarn coverage

README.md

@@ -8,35 +8,35 @@ The `master` branch only contains the `SimpleSwap` contract for now. Everything
 
 ## Tests
 
-This is a regular truffle project. You can either use `truffle test` (if installed) or `npm test` which will use a locally installed truffle.
+This is a hardhat project using the truffle plugin (for tests as this used to be truffle-based). You can run tests using `yarn test`.
 
 ```sh
-npm install
-npm test
+yarn
+yarn test
 ```
 
-To also generate coverage information use `npm run coverage` instead.
+To also generate coverage information use `yarn coverage` instead.
 
 ## Linting
 
-This repo currently uses `solhint` as linter. It can be called through npm:
+This repo currently uses `solhint` as linter. It can be called through yarn:
 ```sh
-npm run solhint
+yarn lint
 ```
 
 ## Go-bindings
 
 To generate go bindings use
 ```sh
-npm run abigen
+yarn abigen
 ```
 
 This will generate the bindings in the `bindings/` directory. Suitable versions of `solc` and `abigen` have to be installed for this to work.
 Alternatively this can also be done through docker:
 
 ```sh
 docker build -t sw3 -f Dockerfile.abigen .
-docker run -v $(pwd)/bindings:/sw3/bindings sw3 npm run abigen
+docker run -v $(pwd)/bindings:/sw3/bindings sw3 yarn abigen
 ```
 
 In addition to the file from `abigen` this will also generate a go file that includes the runtime bytecode.

hardhat.config.js

@@ -0,0 +1,35 @@
+require("@nomiclabs/hardhat-truffle5");
+require("solidity-coverage")
+
+
+// Define mnemonic for accounts.
+let mnemonic = process.env.MNEMONIC;
+if (!mnemonic) {
+  // NOTE: this fallback is for development only!
+  // When using other networks, set the secret in .env.
+  // DO NOT commit or share your mnemonic with others!
+  mnemonic = 'test test test test test test test test test test test test';
+}
+
+const accounts = { mnemonic };
+
+// Config for hardhat.
+module.exports = {
+  solidity: { version: '0.6.12' },  
+  networks: {
+    hardhat: {
+      accounts,
+    },
+    localhost: {
+      url: 'http://localhost:8545',
+      accounts,
+    },
+    staging: {
+      url: 'https://goerli.infura.io/v3/' + process.env.INFURA_TOKEN,
+      accounts,
+    },
+  },
+  paths: {
+    sources: 'contracts',
+  },
+};