Implemenet option to output all content, output each line with line number or output total line none empty

Author: hamdiheb

implement-shell-tools/cat/cat.js

@@ -2,10 +2,34 @@ import { program } from 'commander'
 import process from 'process'
 import fs from 'fs'
 
-const argv = process.argv[2]
-const data = fs.readFileSync(`sample-files/${argv}`, 'utf-8')
+// const argv = process.argv[4]
+// const data = fs.readFileSync(`sample-files/${argv}`, 'utf-8')
+
 program
-  .command('cat')
+  .command('cat <file>')
   .description('Output file content')
-  .option('-a, --all', "show all users' processes")
-  .action(console.log(data))
+  .option('-a, --all', 'Output all content')
+  .option('-n, --line', 'Output each line with number')
+  .option('-b, --nonempty', 'Output total lines not empty')
+  .action((file, options) => {
+    const data = fs.readFileSync(`sample-files/${file}`, 'utf-8').split('\n')
+    if (options.all) {
+      console.log(data.join())
+    }
+    if (options.line) {
+      for (let i = 0; i < data.length; i++) {
+        console.log(`${i} - ${data[i]}`)
+      }
+    }
+    if (options.nonempty) {
+      let totalline = 0
+      data.forEach((line) => {
+        if (line.length != 0) {
+          totalline++
+        }
+      })
+      console.log(totalline)
+    }
+  })
+
+program.parse()