chore: initial function stubs

lib/blockchain/install.js

@@ -112,6 +112,11 @@ function plugin (crypto) {
   return plugin
 }
 
+function getSyncedBlockchains (cryptoList) {
+  const installedCryptos = _.reduce((acc, value) => ({ ...acc, [value.cryptoCode]: isInstalledSoftware(value) && isInstalledVolume(value) }), {}, cryptoList)
+  const syncedBlockchains = plugin()
+}
+
 function run () {  
   const choices = _.flow([
     _.filter(c => c.type !== 'erc-20'),
@@ -132,10 +137,14 @@ function run () {
   questions.push({
     type: 'checkbox',
     name: 'crypto',
-    message: 'Which cryptocurrencies would you like to install?',
+    message: 'Which cryptocurrencies would you like to install?\nTo prevent server resource overloading, only TWO coins should be installed simultaneously.\nMore coins can be installed after this process is over.',
-    choices
+    choices,
+    validate: (a) => {
+      getSyncedBlockchains(cryptos)
+      return _.size(a) > 0 && _.size(a) <= 2
+    }
   })
 
   inquirer.prompt(questions)
-    .then(answers => processCryptos(answers.crypto))
+    .then(answers => console.log('answers', answers) /* processCryptos(answers.crypto) */)
 }

lib/plugins/wallet/bitcoind/bitcoind.js

@@ -176,6 +176,12 @@ function supportsBatching (cryptoCode) {
     .then(() => SUPPORTS_BATCHING)
 }
 
+function checkBlockchainStatus (cryptoCode) {
+  return checkCryptoCode(cryptoCode)
+    .then(() => fetch('getblockchaininfo'))
+    .then(res => !!res['initialblockdownload'] ? 'ready' : 'syncing')
+}
+
 module.exports = {
   balance,
   sendCoins,