Building Interactive npm Command Line Modules

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      # .big-one[.yellow[Building Interactive npm Command Line Applications]]

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      # .big-one[![wave](./src/images/wave.png),   .brown[NodeFest]]

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# .big-one[![sassyLady](./src/images/sassyLady.png) I am .brown[[@_lrlna](https://twitter.com/_lrlna)]]

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# .big-one[.brown[80%] ![ramen](./src/images/ramen.png)]

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# ![canada](./src/images/canada.png)  ![rain](./src/images/rain.png)   .yellow-font[-->]   ![uk](./src/images/uk.png) ![rain](./src/images/rain.png)

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      # .big-one[.brown[Building Interactive npm Command Line Applications]]

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      # .align-centre[.brown[I <3] ![linux](./src/images/penguin.png)]

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      # .align-centre[.brown[4G of Ram]  ![computer](./src/images/computer.png)]

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      # .align-centre[.brown[I <3 CLIs]]

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      # .brown-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

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      # .brown-font[.javascript[tar -xfv /path/to/file]]
      #### where x === --get

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      # .brown-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

--
      # .yellow[lol wut?]

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      # .yellow[Monday]

# .yellow-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

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      # .yellow[Tuesday]

# .yellow-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

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      # .yellow[Wednesday]

# .yellow-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

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      # .yellow[Thursday]

# .yellow-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

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![glasses](./src/images/glasses.png) ![crown](./src/images/crown.png) ![nailCare](./src/images/nail-care.png)

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      # .brown[Friday]

# .brown-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

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      # .yellow-font[.javascript[yourCoolCli -rgb global-status --latest -m]]

## .yellow[lol wut?]

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      # ![ok](./src/images/ok.png), ![cool](./src/images/cool.png)
      # .brown[so what's a command line application ?]

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# .brown[git]
      # .brown-font[.javascript[git rebase i veryCoolSHA]]

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# .brown[npm]
      # .brown-font[.javascript[npm i coolModule@latest --save]]

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# .brown[vagrant]
      # .brown-font[.javascript[vagrant halt processID]]

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      background-image: url(./src/images/ls.gif)
      background-size: cover

# .yellow[ls]
      # .yellow-font[.javascript[ls -al]]

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      background-image: url(./src/images/cowsay.gif)
      background-size: cover

# .yellow[cow-say]
      # .yellow-font[.javascript[cowsay hello nodefest]]
      .citation[https://www.npmjs.com/package/cowsay]

---
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# .yellow[wombat]
      # .yellow-font[.javascript[wombat hello nodefest]]
      .citation[https://www.npmjs.com/package/wombatjs]

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      background-image: url(./src/images/wombatjs.gif)
      background-size: cover

.citation[https://www.npmjs.com/package/wombatjs]

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      # ![ok](./src/images/ok.png), ![cool](./src/images/cool.png)
      # .yellow[so what's a command line application ?]

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      > Command Line Interface is a means of interacting with a computer program where the user *issues commands to the program* in the form of successive lines of text.

.blockquote-footer[[the internet](https://en.wikipedia.org/wiki/Command-line_interface)]

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# .brown-font[issues commands to the program]

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# .brown-font[~~issues commands to~~ interacts with the program]

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# .yellow-font[.javascript[yourCoolCli -rgb global-status --latest -m]]
      # .yellow[lol wut?]

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      class: bottom, center
      background-image: url(./src/images/excited-baby.gif)
      background-size: cover

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      # .brown[Irina's guide to interactivity™]
      ### .brown-font[aka level up your CLI skillz]

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# ![cool](./src/images/cool.png) .yellow-font[,] 
      #.yellow[so you want to write a command line module?]

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.twitter-img[![_lrlna-what-clis](./src/images/lrlna-what-clis.png)]

.citation[[https://twitter.com/_lrlna/status/763135592154660864](https://twitter.com/_lrlna/status/763135592154660864)]

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.twitter-img[![trott](./src/images/trott.png)]

.citation[[https://twitter.com/trott/status/763145652368879616](https://twitter.com/trott/status/763145652368879616)]

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.twitter-img[![ceejbot](./src/images/ceejbot.png)]

.citation[[https://twitter.com/ceejbot/status/763140341620801537](https://twitter.com/ceejbot/status/763140341620801537)]

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.twitter-img[![rickycodes](./src/images/rickycodes.png)]

.citation[[https://twitter.com/rickycodes/status/763243646854565888](https://twitter.com/rickycodes/status/763243646854565888)]

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.twitter-img[![othiym23](./src/images/othiym23.png)]

.citation[[https://twitter.com/othiym23/status/763144318911512576](https://twitter.com/othiym23/status/763144318911512576)]

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.twitter-img[![evilchili](./src/images/evilchili.png)]

.citation[[https://twitter.com/evilchili/status/763172629477859329](https://twitter.com/evilchili/status/763172629477859329)]

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.twitter-img[![brianloveswords](./src/images/brianloveswords.png)]

.citation[[https://twitter.com/brianloveswords/status/763245592726401024](https://twitter.com/brianloveswords/status/763245592726401024)]

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# .align-center[![robot](./src/images/robot.png) .yellow-font[-------> bash?]]

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# .align-center[![robot](./src/images/robot.png) .yellow-font[-------> ruby?]]

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# .align-center[![robot](./src/images/robot.png) .yellow-font[-------> perl?]]

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# .align-center[![robot](./src/images/robot.png) .brown-font[-------> node]]

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# .align-centre[![scream](./src/images/scream.png) argument parsing]

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# .yellow[.javascript[process.argv.slice(2)]]

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      background-image: url(./src/images/parser.gif)
      background-size: cover
      background-position: left

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# .align-center[![robot](./src/images/robot.png) .brown-font[------->node]]

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      # .brown[Irina's guide to interactivity™]
      ### .brown-font[aka level up your CLI skillz]

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      # .yellow[Level 1]

# ![scream](./src/images/scream.png) .yellow-font[argument parsing]]]]

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      background-image: url(./src/images/yargs.png)
      background-size: cover
      background-position: left

.citation[yargs.js.org]

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      background-image: url(./src/images/parser.gif)
      background-size: cover
      background-position: left

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      background-image: url(./src/images/yargs.png)
      background-size: cover
      background-position: left

.citation[yargs.js.org]

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      # .brown[Irina's guide to interactivity™]
      ### .brown-font[aka level up your CLI skillz]

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# We use .brown[options] on daily basis

--
      ```shell
      npm install -g yargs@latest
      ```

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      # .yellow[Level 2]

# .yellow-font[Give your options] .yellow[aliases]

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      ```javascript
        var argv = require('yargs')
        .usage('Usage: $0 -n [string] -f [string]')
        .option('n', {
            alias: 'name',
            describe: 'Twitter name of your choosing',
            type: 'string',
            demand: true
        })
      ```
      .citation[https://www.npmjs.com/package/twitter-node-name]

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```shell
      twitter-node-name --name ira<2728>
      ```
      # .yellow[or]
      ```shell
      twitter-node-name -n ira<2728>
      ```
      .citation[https://www.npmjs.com/package/twitter-node-name]
      ---
      class: middle, dark

background-image: url(./src/images/twitter-node-name.gif)
      background-size: cover
      background-position: left

.citation[https://www.npmjs.com/package/twitter-node-name]

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      # .yellow[Level 3]

# .yellow-font[Set up] .yellow[default] .yellow-font[values]

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```javascript
      .option("yellow", {
          alias: "y",
          describe: "yellow wombat",
          type: "boolean",
          default: true
      })
      ```
      .citation[https://www.npmjs.com/package/wombatjs]

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      # .yellow[Level 4]

# .yellow-font[Provide a] .yellow[help] .yellow-font[menu]
      ![pray](./src/images/pray.png)

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      class: middle
      ```javascript
      var argv = require('yargs')
         // all your options
        .help()
        .argv
      ```

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background-image: url(./src/images/twitter-node-help.gif)
      background-size: cover
      background-position: left

.citation[[https://www.npmjs.com/package/twitter-node-name](https://www.npmjs.com/package/twitter-node-name)]

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# .brown[<argument>]

--
      # .brown[--option]

--
      # .brown[command]

--
      # .brown[[optional param]]

.citation[[http://docopt.org/](http://docopt.org/)]

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      # .yellow[Level 5]

# .yellow-font[Get] .yellow[input] .yellow-font[from your users]

---
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      ```javascript
      prompt.start()
      var property = {
          name: "yesno",
          message: message,
          validator: /y[es]*|n[o]?/,
          warning: "Please respond with yer or no",
          default: "yes"
      }

prompt.get(property, function(err, result) {
          if (err) console.log(err)
          done(result)
      })

```
      ---
      class: middle, light

```bash
      prompt: Are you sure you want to overwrite: (yes)
      ```

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# .align-center[.brown[wow p cool] ![sparkles](./src/images/sparkles.png) .brown[prompt] ![sparkles](./src/images/sparkles.png)]

.citation[https://www.npmjs.com/package/prompt]

---
      class: middle, light
      ```javascript
      // where setuprc is your questions file
      promzard(setuprc, function(err, data) {
        // do <2728> magic <2728> with data
      }
      // setuprc
      module.exports = {
          "displayName": prompt("Hey stranger, what shall you be called?", function(displayName) {
              return displayName;
          })
      }
      ```
      ---
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      ```bash
      Hey stranger, what shall you be called?: irina
      ```

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# .align-center[.brown[wow p cool] ![sparkles](./src/images/sparkles.png) .brown[prompt] ![sparkles](./src/images/sparkles.png)]

.citation[https://www.npmjs.com/package/prompt]

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      # .yellow[Level 6]

# .yellow-font[Why not use] .yellow[commands] .yellow-font[?]
      ![sassyLady](./src/images/sassyLady.png)

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# .brown-font[We can make options] .brown[descriptive]

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#.brown-font[but they are not] .brown[*interactive*]

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# user issues commands to the program

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# user ~~issues commands to~~ .brown[interact] with the program

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# .align-center[.brown[wow p cool] ![sparkles](./src/images/sparkles.png) .brown[commands] ![sparkles](./src/images/sparkles.png)]

.citation[https://www.npmjs.com/package/prompt]

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      # .brown[yargs] .brown-font[lets you build out command modules]

---
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      ```javascript
      yargs.command(require('text'))
        .help()
        .argv
      ```

---
      class: middle, light
      ```javascript
      exports.command = 'text <contact> <message>'
      exports.describe = 'text message your contact'
      exports.builder = {
        contact: {
          default: 'mom'
        },
        message: {
          default: 'brunch on sunday?'
        }
      }
      exports.handler = function (argv) {
        // do <2728> magic <2728>
      }
      ```
      ---
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      # .yellow[Level 7]

# .yellow-font[Just add] .yellow[colour]
      ![nailCare](./src/images/nail-care.png)

---
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# .align-center[.brown[wow p cool] ![sparkles](./src/images/sparkles.png) .brown[colour] ![sparkles](./src/images/sparkles.png)]

.citation[https://www.npmjs.com/package/cli-color]

---
      class: middle, light

```javascript
      clc.yellow(wombat + concatArgvs(argv._))
      ```

---
      class: middle, light

# .align-center[.brown[wow p cool] ![sparkles](./src/images/sparkles.png) .brown[colour] ![sparkles](./src/images/sparkles.png)]

.citation[https://www.npmjs.com/package/chalk]

---
      class: middle, light

```javascript
      chalk.yellow(wombat + concatArgvs(argv._))
      ```

---
      class: middle, dark
      # .yellow[Level 8]

# .yellow-font[Can we get the user to] .yellow[interact] .yellow-font[with the program other than prompts?]

---
      class: middle, light

# .align-center[.brown[wow p cool] ![sparkles](./src/images/sparkles.png) .brown[inquirer] ![sparkles](./src/images/sparkles.png)]

.citation[https://www.npmjs.com/package/inquirer]

---
      class: middle, light
      ```javascript
      var prompt = inquirer.createPromptModule();
      prompt({type: 'list', message: 'yourCoolQuestionPrompt' })
        .then(// do <2728> magic <2728>);
       
      //{type: 'list'}
      //{type: 'checkbox'}
      ```

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      background-image: url(./src/images/magic.gif)
      background-size: cover
      class: bottom, center

# .brown[alt='magic']

---
      class: middle, dark

---
      class: middle, light

# .brown[Get out there, and build command line interfaces]

---
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# .big-one[.yellow[Thank you] ![sparkles](./src/images/sparkles.png)]
      ## .yellow[[@_lrlna](https://twitter.com/_lrlna)]
      ## .yellow[lrlna.github.io/nodefest-2016]