Move to lerna repo (#19)

* Pull api-* packages into lerna repo

* Bootstrap with hoist

* Update jest alias config

* Add api-jsonrpc

* Pull in jsonrpc

* Update badges

* Don't hoist, use workspaces

* .eslintrc to root

* Cleanups, build from root

* Shorthand commands

* Update to @polkadot/dev 0.9.1

* Update description

packages/api-format/src/input/hex.js

@@ -0,0 +1,33 @@
+// ISC, Copyright 2017 Jaco Greeff
+// @flow
+
+const { hexAddPrefix, hexHasPrefix, hexStripPrefix } = require('@polkadot/util/hex');
+
+const H64_ZERO: string = '00000000000000000000000000000000';
+const H128_ZERO: string = `${H64_ZERO}${H64_ZERO}`;
+const H256_ZERO: string = `${H128_ZERO}${H128_ZERO}`;
+// const H512_ZERO: string = `${H256_ZERO}${H256_ZERO}`;
+
+function leftHexPad (value: ?string, bitLength: number): string {
+  const length = 2 * bitLength / 8;
+
+  if (hexHasPrefix(value)) {
+    value = hexStripPrefix(value);
+  }
+
+  return hexAddPrefix(`${H256_ZERO}${value || ''}`.slice(-length));
+}
+
+function formatH160 (value: ?string): string {
+  return leftHexPad(value, 160);
+}
+
+function formatH256 (value: ?string): string {
+  return leftHexPad(value, 256);
+}
+
+module.exports = {
+  leftHexPad,
+  formatH160,
+  formatH256
+};