Implement script to flatten contracts

docker/docker-compose.yml

@@ -0,0 +1,8 @@
+version: '2'
+services:
+  flatten:
+    build:
+      context: .
+      dockerfile: solidity-flattener/Dockerfile
+    volumes:
+      - ../:/project

docker/solidity-flattener/Dockerfile

@@ -0,0 +1,6 @@
+FROM ethereum/solc:0.4.18 AS solc
+
+FROM python:3.6.4
+COPY --from=solc /usr/bin/solc /usr/bin/solc
+RUN pip3 install solidity-flattener
+ENTRYPOINT ["solidity_flattener"]

package.json

@@ -25,7 +25,13 @@
     "lint:tslint": "tslint --project .",
     "lint:tslint:fix": "tslint --fix --project .",
     "lint:solhint": "solhint contracts/**/*.sol test/**/*.sol",
-    "format": "prettier --write *.ts **/*.ts"
+    "format": "prettier --write *.ts **/*.ts",
+    "flatten:migrations": "run-s compile:ts flatten:migrations:js",
+    "flatten:migrations:js": "node scripts/flatten.js -c Migrations",
+    "flatten:token": "run-s compile:ts flatten:token:js",
+    "flatten:token:js": "node scripts/flatten.js -c OnLiveToken",
+    "flatten:externalcrowdsale": "run-s compile:ts flatten:externalcrowdsale:js",
+    "flatten:externalcrowdsale:js": "node scripts/flatten.js -c ExternalCrowdsale"
   },
   "repository": {
     "type": "git",

scripts/flatten.ts

@@ -0,0 +1,49 @@
+// tslint:disable:no-console
+
+import * as commander from 'commander';
+
+import { spawn } from 'child_process';
+import { createWriteStream } from 'fs';
+import { join } from 'path';
+
+interface Options {
+  contract: string;
+}
+
+const argv = (commander
+  .option('-c, --contract <contract', 'contract name')
+  .parse(process.argv)
+  .opts() as any) as Options;
+
+if (!argv.contract) {
+  throw new Error('Missing contract name [-c, --contract]');
+}
+
+const args = [
+  'run',
+  '--rm',
+  'flatten',
+  '--solc-paths',
+  'zeppelin-solidity/=/project/node_modules/zeppelin-solidity/',
+  `/project/contracts/${argv.contract}.sol`
+];
+
+const outPath = join(__dirname, '..', 'build', 'flat', `${argv.contract}.sol`);
+const outStream = createWriteStream(outPath);
+
+const child = spawn('docker-compose', args, {
+  cwd: join(__dirname, '..', 'docker')
+});
+
+child.stdout.pipe(outStream);
+child.stderr.on('data', chunk => {
+  console.error(chunk.toString());
+});
+
+child.on('close', code => {
+  if (code !== 0) {
+    console.error(`Failed to flatten ${argv.contract} contract`);
+  } else {
+    console.log(`Saved flattened ${argv.contract} contract to ${outPath}`);
+  }
+});