feat: add w command output parser

lib/parser.js

@@ -0,0 +1,16 @@
+'use strict';
+
+module.exports = function parse(output) {
+    const lines = output.split('\n')
+
+    const columns = lines[1].split(' ').filter(column => column).map(entry => entry.toLowerCase())
+    const values = lines.slice(2).map(line => line.split(' ').filter(entry => entry))
+    return values.slice(0, values.length - 1).reduce((context, next) => {
+        const line = {}
+        next.forEach((value, index) => {
+            line[columns[index]] = value
+        })
+        context.push(line)
+        return context
+    }, [])
+}

test/spec/parser.spec.js

@@ -0,0 +1,64 @@
+'use strict'
+
+const parser = require('../../lib/parser')
+const { expect } = require('chai')
+
+describe('Parser', () => {
+    it('returns emtpy result if no user logged in', () => {
+        const input = ` 23:50:13 up 1 day, 11:33,  1 user,  load average: 0.08, 0.03, 0.01
+        USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
+        `
+        const result = parser(input)
+        expect(result).to.have.length(0)
+    })
+    it('returns list with size one if one user is logged in', () => {
+        const input = ` 23:50:13 up 1 day, 11:33,  1 user,  load average: 0.08, 0.03, 0.01
+        USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
+        pi       pts/0    192.168.2.107    23:50    1.00s  0.15s  0.01s w
+        `
+        const results = parser(input)
+        expect(results).to.have.length(1)
+    })
+    it('returns one user object for one logged in user', () => {
+        const input = ` 23:50:13 up 1 day, 11:33,  1 user,  load average: 0.08, 0.03, 0.01
+        USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
+        pi       pts/0    192.168.2.107    23:50    1.00s  0.15s  0.01s w
+        `
+        const results = parser(input)
+        const result = results[0]
+        expect(result.user).to.equal('pi')
+        expect(result.tty).to.equal('pts/0')
+        expect(result.from).to.equal('192.168.2.107')
+        expect(result['login@']).to.equal('23:50')
+        expect(result.idle).to.equal('1.00s')
+        expect(result.jcpu).to.equal('0.15s')
+        expect(result.pcpu).to.equal('0.01s')
+        expect(result.what).to.equal('w')
+    })
+    it('returns one user object for one logged in user', () => {
+        const input = ` 23:50:13 up 1 day, 11:33,  1 user,  load average: 0.08, 0.03, 0.01
+        USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
+        pi       pts/0    192.168.2.107    23:50    1.00s  0.15s  0.01s w
+        raspi       pts/1    195.168.2.107    24:50    5.00s  3.15s  1.01s x
+        `
+        const results = parser(input)
+        const result = results[0]
+        expect(result.user).to.equal('pi')
+        expect(result.tty).to.equal('pts/0')
+        expect(result.from).to.equal('192.168.2.107')
+        expect(result['login@']).to.equal('23:50')
+        expect(result.idle).to.equal('1.00s')
+        expect(result.jcpu).to.equal('0.15s')
+        expect(result.pcpu).to.equal('0.01s')
+        expect(result.what).to.equal('w')
+        const secondResult = results[1]
+        expect(secondResult.user).to.equal('raspi')
+        expect(secondResult.tty).to.equal('pts/1')
+        expect(secondResult.from).to.equal('195.168.2.107')
+        expect(secondResult['login@']).to.equal('24:50')
+        expect(secondResult.idle).to.equal('5.00s')
+        expect(secondResult.jcpu).to.equal('3.15s')
+        expect(secondResult.pcpu).to.equal('1.01s')
+        expect(secondResult.what).to.equal('x')
+    })
+})