Implement CLI

1 files changed, 46 insertions, 0 deletions

diff --git a/bin/dicebag.js b/bin/dicebag.js
new file mode 100755
index 0000000..f7b0921
--- /dev/null
+++ b/bin/dicebag.js
@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+/* eslint no-console: 0 */
+
+const { parse, roll, pool } = require('../index.js')
+
+const parseArgs = () => {
+  const args = process.argv.slice(2)
+  const parsedArgs = {
+    roller: roll,
+    expression: null
+  }
+
+  while (args.length > 0) {
+    const arg = args.shift()
+    if (arg === '-p') {
+      parsedArgs.roller = pool
+    } else {
+      parsedArgs.expression = arg
+    }
+  }
+
+  return parsedArgs
+}
+
+const rollDie = (string, roller) => {
+  try {
+    const die = parse(string.trim())
+    console.log(roller(die))
+  } catch (error) {
+    console.log(error.message)
+  }
+}
+
+const runIoLoop = (roller) => {
+  process.stdin.setEncoding('utf8')
+  process.stdin.on('data', (string) => {
+    rollDie(string, roller)
+  })
+}
+
+const parsedArgs = parseArgs()
+if (parsedArgs.expression) {
+  rollDie(parsedArgs.expression, parsedArgs.roller)
+} else {
+  runIoLoop(parsedArgs.roller)
+}