README: Add development instructions

Also:
- Makes the second parameter of deployment-artifacts-to-app-env.ts
  optional and emit on stdout when missing, so that people can use the
  script to copy & paste into their env file easily.
- In the .env example file, make the hardhat env the default (one less
  thing to do for contributors).

README.md

@@ -1 +1,44 @@
-# BOLD
+# Liquity v2
+
+## Requirements
+
+- [Node.js](https://nodejs.org/)
+- [pnpm](https://pnpm.io/)
+- [Foundry](https://book.getfoundry.sh/getting-started/installation)
+
+## Setup
+
+```sh
+git clone git@github.com:liquity/bold.git
+cd bold
+pnpm install
+```
+
+## How to develop
+
+```sh
+# Run the anvil local node
+anvil
+
+# Deploy the contracts
+cd contracts
+./deploy local --open-demo-troves # optionally open troves for the first 8 anvil accounts
+
+# Print the addresses of the deployed contracts
+pnpm tsx utils/deployment-artifacts-to-app-env.ts deployment-context-latest.json
+
+# Now, the app:
+cd ../frontend
+
+# Copy the example .env file
+cp .env .env.local
+
+# Edit the .env.local file:
+#  - Make sure the Hardhat / Anvil section is uncommented.
+#  - Copy into it the addresses printed by the previous command.
+
+# Run the app development server
+pnpm dev
+
+# Open https://localhost:3000 in your browser
+```

contracts/utils/deployment-artifacts-to-app-env.ts

@@ -6,11 +6,15 @@ converts the deployment artifacts created by ./deploy into environment
 variables to be used by the Next.js app located in frontend/.
 
 Usage:
-  ./deployment-artifacts-to-app-env.ts <INPUT_JSON> <OUTPUT_ENV> [OPTIONS]
+  ./deployment-artifacts-to-app-env.ts <INPUT_JSON> [OUTPUT_ENV] [OPTIONS]
+
+Arguments:
+  INPUT_JSON                               Path to the deployment artifacts JSON file.
+  OUTPUT_ENV                               Path to the environment variables file (if missing, stdout is used).
 
 Options:
   --help, -h                               Show this help message.
-  --append                                 Append to the output file instead of overwriting it.
+  --append                                 Append to the output file instead of overwriting it (requires OUTPUT_ENV).
 `;
 
 const ZAddress = z.string().regex(/^0x[0-9a-fA-F]{40}$/);
@@ -40,8 +44,8 @@ export async function main() {
     process.exit(0);
   }
 
-  if (!options.inputJsonPath || !options.outputEnvPath) {
-    console.error("\nInvalid number of arguments provided (--help for instructions).\n");
+  if (!options.inputJsonPath) {
+    console.error("\nPlease provide the path to the deployment artifacts JSON file.\n");
     process.exit(1);
   }
 
@@ -53,6 +57,11 @@ export async function main() {
     deploymentContextToAppEnvVariables(deploymentContext),
   );
 
+  if (!options.outputEnvPath) {
+    console.log(outputEnv);
+    process.exit(0);
+  }
+
   await fs.ensureFile(options.outputEnvPath);
   if (options.append) {
     await fs.appendFile(options.outputEnvPath, `\n${outputEnv}\n`);

frontend/.env

@@ -1,20 +1,20 @@
 NEXT_PUBLIC_WALLET_CONNECT_PROJECT_ID=1
 
 # Ethereum
-NEXT_PUBLIC_CHAIN_ID=1
-NEXT_PUBLIC_CHAIN_NAME=Ethereum
-NEXT_PUBLIC_CHAIN_CURRENCY=Ether|ETH|18
-NEXT_PUBLIC_CHAIN_RPC_URL=https://cloudflare-eth.com
-NEXT_PUBLIC_CHAIN_BLOCK_EXPLORER=Etherscan|https://etherscan.io
-NEXT_PUBLIC_CHAIN_CONTRACT_ENS_REGISTRY=0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e
-NEXT_PUBLIC_CHAIN_CONTRACT_ENS_RESOLVER=0xce01f8eee7E479C928F8919abD53E553a36CeF67|19258213
-NEXT_PUBLIC_CHAIN_CONTRACT_MULTICALL=0xca11bde05977b3631167028862be2a173976ca11|14353601
-
-# Hardhat
-# NEXT_PUBLIC_CHAIN_ID=31337
-# NEXT_PUBLIC_CHAIN_NAME=Hardhat
+# NEXT_PUBLIC_CHAIN_ID=1
+# NEXT_PUBLIC_CHAIN_NAME=Ethereum
 # NEXT_PUBLIC_CHAIN_CURRENCY=Ether|ETH|18
-# NEXT_PUBLIC_CHAIN_RPC_URL=http://127.0.0.1:8545
+# NEXT_PUBLIC_CHAIN_RPC_URL=https://cloudflare-eth.com
+# NEXT_PUBLIC_CHAIN_BLOCK_EXPLORER=Etherscan|https://etherscan.io
+# NEXT_PUBLIC_CHAIN_CONTRACT_ENS_REGISTRY=0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e
+# NEXT_PUBLIC_CHAIN_CONTRACT_ENS_RESOLVER=0xce01f8eee7E479C928F8919abD53E553a36CeF67|19258213
+# NEXT_PUBLIC_CHAIN_CONTRACT_MULTICALL=0xca11bde05977b3631167028862be2a173976ca11|14353601
+
+# Hardhat / Anvil
+NEXT_PUBLIC_CHAIN_ID=31337
+NEXT_PUBLIC_CHAIN_NAME=Hardhat
+NEXT_PUBLIC_CHAIN_CURRENCY=Ether|ETH|18
+NEXT_PUBLIC_CHAIN_RPC_URL=http://127.0.0.1:8545
 
 # Liquity Testnet
 # NEXT_PUBLIC_CHAIN_ID=1337