Work out which commands I use in Fish the most

count-commands.js

'use strict'

const fs = require('fs')
const path = require('path')
const os = require('os')
const df = require('data-forge')

// Read the history of commands executed in the Fish shell and work out which
// are used the most!
const filePath = path.join(os.homedir(), '.local/share/fish/fish_history')
const historyFile = fs.readFileSync(filePath)

// Entries in the Fish shell history are stored in the following format:
// - cmd: git add package-lock.json
//   when: 1527650946
//   paths:
//     - package-lock.json
// We only care about the initial part of the command here
const cmdRegex = /^- cmd: ([a-z_\-0-9]+).*$/i

new df.DataFrame(historyFile.toString().split('\n'))
    .where(line => cmdRegex.test(line))
    .select(line => cmdRegex.exec(line)[1])
    .groupBy(cmd => cmd)
    .select(group => ({ name: group.first(), count: group.count() }))
    .orderByDescending(cmd => cmd.count)
    .forEach(cmd => {
        console.log(cmd.name + ': ' + cmd.count)
    })