Refactor helper scripts to use kredits module

This reuses the kredits library functions in the helper scripts and
seeds. We no longer need to add IPFS hashes manually but simply can
provider contributor/proposal data.

scripts/add-contributor.js

@@ -1,45 +1,50 @@
 const Registry = artifacts.require('./Registry.sol');
-const Operator = artifacts.require('./Operator.sol');
-const Contributors = artifacts.require('./Contributors.sol');
 const promptly = require('promptly');
-
 const bs58 = require('bs58');
 
-function getBytes32FromMultiash(multihash) {
-  const decoded = bs58.decode(multihash);
+const ethers = require('ethers');
+const Kredits = require('../lib/kredits');
 
-  return {
-    digest: `0x${decoded.slice(2).toString('hex')}`,
-    hashFunction: decoded[0],
-    size: decoded[1],
-  };
+async function prompt(message, options) {
+  if (!options) {
+    options = {default: ''}
+  }
+  return await promptly.prompt(message, options);
 }
 
 module.exports = function(callback) {
   Registry.deployed().then(async (registry) => {
-    var operatorAddress = await registry.getProxyFor('Operator');
-    var contributorsAddress = await registry.getProxyFor('Contributors');
 
-    var operator = await Operator.at(operatorAddress);
-    var contributors = await Contributors.at(contributorsAddress);
+    const networkId = parseInt(web3.version.network);
+    const provider = new ethers.providers.Web3Provider(
+      web3.currentProvider, { chainId: networkId }
+    );
+    const kredits = await Kredits.setup(provider, provider.getSigner());
 
-    let contributorToAddAddress = await promptly.prompt('Contributor address: ');
-    let ipfsHash = await promptly.prompt('IPFS hash (blank for default): ', { default: 'QmQNA1hhVyL1Vm6HiRxXe9xmc6LUMBDyiNMVgsjThtyevs' });
+    console.log(`Using contributors at: ${kredits.Contributor.contract.address}`);
 
-    let contributorMultihash = getBytes32FromMultiash(ipfsHash);
-    let isCore = true;
-    let contributorResult = await contributors.addContributor(contributorToAddAddress, contributorMultihash.digest, contributorMultihash.hashFunction, contributorMultihash.size, isCore);
-    console.log('Contributor added, tx: ', contributorResult.tx);
+    let contributorAttributes = {
+      account: await prompt('Contributor address: ', {}),
+      name: await prompt('Name: '),
+      isCore: await prompt('core? y/n') === 'y',
+      kind: await prompt('Kind (default person): ', {default: 'person'}),
+      url: await prompt('URL: '),
+      github_username: await prompt('GitHub username: '),
+      github_uid: await prompt('GitHub UID: '),
+      wiki_username: await prompt('Wiki username: '),
+    };
 
-    let contributorId = await contributors.getContributorIdByAddress(contributorToAddAddress);
-    let proposalMultihash = getBytes32FromMultiash('QmQNA1hhVyL1Vm6HiRxXe9xmc6LUMBDyiNMVgsjThtyevs');
-    let proposalResult = await operator.addProposal(contributorId, 23, proposalMultihash.digest, proposalMultihash.hashFunction, proposalMultihash.size);
-    console.log('Proposal added, tx: ', proposalResult.tx);
+    console.log("\nAdding contributor:");
+    console.log(contributorAttributes);
 
-    let proposalId = await operator.proposalsCount();
-    let votingResult = await operator.vote(proposalId.toNumber()-1);
-    console.log('Voted for proposal', proposalId.toString(), votingResult.tx);
+    kredits.Contributor.add(contributorAttributes, {gasLimit: 250000}).then((result) => {
+      console.log("\n\nResult:");
+      console.log(result);
+      callback();
+    }).catch((error) => {
+      console.log('Failed to create contributor');
+      callback(error);
+    });
 
-    callback();
   });
 }