feat(cli): Add input CLI option!

ref #25

index.js

@@ -2,49 +2,62 @@
 
 const program = require('commander')
 const updateNotifier = require('update-notifier')
+const fs = require('fs-extra')
 
 const reporter = require('./lib/reporter')
 const pkg = require('./package.json')
 
 updateNotifier({ pkg }).notify()
 
+let stdin = ''
+
 program
   .version(pkg.version)
   .option('-o, --output [output]', 'output file')
+  .option('-i, --input [input]', 'input file')
   .option('-t, --template [handlebars file]', 'handlebars template file')
+  .action(async (cmd, env) => {
+    try {
+      let data
+      if (cmd.input) {
+        data = await fs.readJson(cmd.input)
+      } else if (stdin) {
+        data = JSON.parse(stdin)
+      } else {
+        console.log('No input')
+        return process.exit(1)
+      }
 
-const genReport = (stdin, output = 'npm-audit.html', template) => {
-  if (!stdin) {
-    console.log('No JSON')
-    return process.exit(1)
-  }
+      await genReport(data, cmd.output, cmd.template)
+    } catch (err) {
+      console.error('Failed to parse NPM Audit JSON!')
+      return process.exit(1)
+    }
+  })
 
-  let json
+const genReport = async (data, output = 'npm-audit.html', template) => {
   try {
-    json = JSON.parse(stdin)
+    if (!data) {
+      console.log('No JSON')
+      return process.exit(1)
+    }
+
+    const templateFile = template || `${__dirname}/templates/template.hbs`
+
+    await reporter(data, templateFile, output)
+
+    console.log(`Vulnerability snapshot saved at ${output}`)
+    process.exit(0)
   } catch (err) {
-    console.error('Failed to parse NPM Audit JSON!')
-    return process.exit(1)
+    console.log('An error occurred!')
+    console.log(err)
+    process.exit(1)
   }
-
-  const templateFile = template || `${__dirname}/templates/template.hbs`
-
-  reporter(json, templateFile, output)
-    .then(() => {
-      console.log(`Vulnerability snapshot saved at ${output}`)
-      process.exit(0)
-    })
-    .catch(err => {
-      console.log('An error occurred!')
-      console.log(err)
-      process.exit(1)
-    })
 }
 
 if (process.stdin.isTTY) {
   program.parse(process.argv)
 } else {
-  let stdin = ''
   process.stdin.on('readable', function () {
     const chunk = this.read()
     if (chunk !== null) {
@@ -53,6 +66,5 @@ if (process.stdin.isTTY) {
   })
   process.stdin.on('end', function () {
     program.parse(process.argv)
-    genReport(stdin, program.output, program.template)
   })
 }