James Ellis

James Ellis

1593462660

A fully working, most feature-rich Vue.js terminal emulator

vue-command

A fully working, most feature-rich Vue.js terminal emulator. See the demo.

Features

  • Parses arguments with getopts
  • Supports asynchronous commands
  • Browse history (with /)
  • Autocompletion resolver (with )
  • Customize terminal with slots
  • Search history (with Ctrl + r)

Installation

$ npm i vue-command --save

Usage

Let’s start with a very simple example. We want to send “Hello world” to Stdout when entering hello-world.

<template>
  <vue-command :commands="commands" />
</template>

<script>
import VueCommand, { createStdout } from 'vue-command'
import 'vue-command/dist/vue-command.css'

export default {
  components: {
    VueCommand
  },

  data: () =>  ({
    commands: { 
      'hello-world': () => createStdout('Hello world') 
    }
  })
}
</script>

Now a more complex one. Let’s assume we want to build the Nano editor available in many shells.

We will use the provided environment variable to make sure the editor is only visible when this command is executing and inject a function called terminate to tell the terminal that the command has been finished when the user enters Ctrl + x. Furthermore, we inject the setIsFullscreen function to switch the terminal into fullscreen mode.

<template>
  <div v-if="environment.isExecuting">
    <textarea
      ref="nano"
      @keydown.ctrl.88="terminate">This is a text editor! Press Ctrl + x to leave.</textarea>
  </div>
</template>

<script>
export default {
  inject: ['setIsFullscreen', 'terminate'],

  created () {
    this.setIsFullscreen(true)
  },

  mounted () {
    this.$refs.nano.focus()
  }
}
</script>

Now the command has to return the component.

<template>
  <vue-command :commands="commands" />
</template>

<script>
import VueCommand from 'vue-command'
import 'vue-command/dist/vue-command.css'

import NanoEditor from '@/components/NanoEditor.vue'

export default {
  components: {
    VueCommand
  },

  data: () =>  ({
    commands: { 
      nano: () => NanoEditor 
    }
  })
}
</script>

Properties

There are two types of commands: Built-in and regular ones. In most cases regular commands are appropriate. Built-in commands provide higher flexibility, see section Built-in for more information.

Some properties can be changed by the terminal, therefore, the sync modifier has to be added.

Property Type Default Required Sync Description
autocompletion-resolver Function null No No See Autocompletion resolver
built-in Object {} No No See Built-in section
commands Object Yes No See Commands section
cursor Number 0 No Yes Sets the Stdin cursor position
event-listeners Array [EVENT_LISTENERS.autocomplete, EVENT_LISTENERS.history, EVENT_LISTENERS.search] No No See Event listeners section
executed Set new Set() No Yes Executed programs, see “Overwriting executed functions”
help-text String Type help No No Sets the placeholder
help-timeout Number 4000 No No Sets the placeholder timeout
hide-bar Boolean false No No Hides the bar
hide-prompt Boolean false No No Hides the prompt
history Array [] No Yes Executed commands
intro String Fasten your seatbelts! No No Sets the intro
is-fullscreen Boolean false No Yes Sets the terminal fullscreen mode
is-in-progress Boolean false No Yes Sets the terminal progress status
not-found String not found No No Sets the command not found text
parser-options Object {} No No Sets the parser options
pointer Number 0 No Yes Sets the command pointer
prompt String ~neil@moon:# No No Sets the prompt
show-help Boolean false No No Shows the placeholder
show-intro Boolean false No No Shows the intro
stdin String '' No Yes Sets the current Stdin
title String neil@moon: ~ No No Sets the title

Commands

commands must be an object containing key-value pairs where key is the command and the value is a function that will be called with the getops arguments. The function can return a Promise and must return or resolve a Vue.js component. To return strings or nothing use one of the convenient helper methods:

Function Description
createStdout(content: String, isEscapeHtml: Boolean, name: String, ...mixins: Array): Object Returns a Stdout component containing a span element with given inner content
createStderr(content: String, isEscapeHtml: Boolean, name: String, ...mixins: Array): Object Returns a Stderr component containing a span element with given inner content
createDummyStdout(name: String, ...mixins: Array): Object Returns a dummy Stdout to show a Stdin

Helper methods can be imported by name:

import { createStdout, createStderr, createDummyStdout } from 'vue-command'

If none of the helper methods is used, the command has to be manually terminated inside the component. Next to termination it’s possible to inject the following functions to manipulate the terminal or signal an event:

Function Description
emitExecute Emit command execution event
emitExecuted Emit command executed event
emitInput(input: String) Emit the current input
setCursor(cursor: Number) Set cursor position
setIsFullscreen(isFullscreen: Boolean) Change if the terminal is in fullscreen mode
setIsInProgress(isInProgress: Boolean) Change if the terminal is in progress
setPointer(pointer: Number) Set command history pointer
setStdin(stdin: String) Set the current Stdin
terminate Executes common final tasks after command has been finished

Functions can be injected into your component by name:

inject: ['setIsFullscreen', 'setIsInProgress', 'terminate']

In your component you have access to a context and an environment variable. The environment variable contains the following properties (note that built-in commands have to take care by theirselves about the terminals state):

Property Description
isExecuting: Boolean Is the current component executing
isFullscreen: Boolean Is the terminal in fullscreen mode
isInProgress: Boolean Is any command active

The context variable contains the following properties:

Property Description
cursor: Number Copy of cursor position at Stdin
executed: Set Copy of executed programs
history: Array Copy of executed commands
parsed: Object Parsed getops arguments
pointer: Number Copy of history command pointer
stdin: String Copy of Stdin

Built-in

Built-in commands provide more control over the terminals behaviour. On the other side, they have to take care about every regular command step. As a matter of fact, regular commands are just calling helper methods or change properties which could be also called or changed by built-in commands. Regular commands can be seen as a facade to built-in commands.

The API is more likely to change. The argument that is called within the built-in command is the unparsed Stdin. It’s possible to use a custom parser at this place.

To fully simulate a full command circle a built-in command has to follow these steps:

  1. Add the programm to the executed Set property
  2. Increase the history pointer
  3. Emit command executing started
  4. Tell terminal there is a command in progress
  5. Push the Stdout component into the history property
  6. Execute actual task
  7. Exit the command with the injected terminate function

Autocompletion resolver

It is possible to provide a function that is called when the user hits the key. This function needs to take care of the autocompletion experience and should make usage of properties like history and stdin. The following shows a possible, simple autocompletion function:

this.autocompletionResolver = () => {
  // Make sure only programs are autocompleted. See below for version with options
  const command = this.stdin.split(' ')
  if (command.length > 1) {
    return
  }

  const autocompleteableProgram = command[0]
  // Collect all autocompletion candidates
  let candidates = []
  const programs = [...Object.keys(this.commands), ...Object.keys(this.builtIn)].sort()
  programs.forEach(program => {
    if (program.startsWith(autocompleteableProgram)) {
      candidates.push(program)
    }
  })

  // Autocompletion resolved into multiple results
  if (this.stdin !== '' && candidates.length > 1) {
    this.history.push({
      // Build table programmatically
      render: createElement => {
        const columns = candidates.length < 5 ? candidates.length : 4
        const rows = candidates.length < 5 ? 1 : Math.ceil(candidates.length / columns)

        let index = 0
        let table = []
        for (let i = 0; i < rows; i++) {
          let row = []
          for (let j = 0; j < columns; j++) {
            row.push(createElement('td', candidates[index]))
            index++
          }

          table.push(createElement('tr', [row]))
        }

        return createElement('table', { style: { width: '100%' } }, [table])
      }
    })
  }

  // Autocompletion resolved into one result
  if (candidates.length === 1) {
    this.stdin = candidates[0]
  }
}
Advanced version with option autocompletion
this.autocompletionResolver = () => {
  // Preserve cursor position
  const cursor = this.cursor

  // Reverse concatenate autocompletable according to cursor
  let pointer = this.cursor
  let autocompleteableStdin = ''
  while (this.stdin[pointer - 1] !== ' ' && pointer - 1 > 0) {
    pointer--
    autocompleteableStdin = `${this.stdin[pointer]}${autocompleteableStdin}`
  }

  // Divide by arguments
  const command = this.stdin.split(' ')

  // Autocompleteable is program
  if (command.length === 1) {
    const autocompleteableProgram = command[0]
    // Collect all autocompletion candidates
    const candidates = []
    const programs = [...Object.keys(this.commands), ...Object.keys(this.builtIn)].sort()
    programs.forEach(program => {
      if (program.startsWith(autocompleteableProgram)) {
        candidates.push(program)
      }
    })

    // Autocompletion resolved into multiple results
    if (this.stdin !== '' && candidates.length > 1) {
      this.history.push({
        // Build table programmatically
        render: createElement => {
          const columns = candidates.length < 5 ? candidates.length : 4
          const rows = candidates.length < 5 ? 1 : Math.ceil(candidates.length / columns)

          let index = 0
          const table = []
          for (let i = 0; i < rows; i++) {
            const row = []
            for (let j = 0; j < columns; j++) {
              row.push(createElement('td', candidates[index]))
              index++
            }

            table.push(createElement('tr', [row]))
          }

          return createElement('table', { style: { width: '100%' } }, [table])
        }
      })
    }

    // Autocompletion resolved into one result
    if (candidates.length === 1) {
      // Mutating Stdin mutates the cursor, so we've to wait to push it to the end
      const unwatch = this.$watch(() => this.cursor, () => {
        this.cursor = cursor + (candidates[0].length - autocompleteableStdin.length + 2)

        unwatch()
      })

      this.stdin = candidates[0]
    }

    return
  }

  // Check if option might be completed already or option is last tokens
  if ((this.stdin[cursor] !== '' && this.stdin[cursor] !== ' ') && typeof this.stdin[cursor] !== 'undefined') {
    return
  }

  // Get the executable
  const program = command[0]

  // Check if any autocompleteable exists
  if (typeof this.options.long[program] === 'undefined' && typeof this.options.short[program] === 'undefined') {
    return
  }

  // Autocompleteable is long option
  if (autocompleteableStdin.substring(0, 2) === '--') {
    const candidates = []
    this.options.long[program].forEach(option => {
      // If only dashes are present, user requests all options
      if (`--${option}`.startsWith(autocompleteableStdin) || autocompleteableStdin === '--') {
        candidates.push(option)
      }
    })

    // Autocompletion resolved into one result
    if (candidates.length === 1) {
      const autocompleted = `${this.stdin.substring(0, pointer - 1)} --${candidates[0]}`
      const rest = `${this.stdin.substring(this.cursor)}`

      // Mutating Stdin mutates the cursor, so we've to wait to push it to the end
      const unwatch = this.$watch(() => this.cursor, () => {
        this.cursor = cursor + (candidates[0].length - autocompleteableStdin.length + 2)

        unwatch()
      })

      this.stdin = `${autocompleted}${rest}`

      return
    }

    // Autocompletion resolved into multiple result
    if (autocompleteableStdin === '--' || candidates.length > 1) {
      this.history.push({
        // Build table programmatically
        render: createElement => {
          const columns = candidates.length < 5 ? candidates.length : 4
          const rows = candidates.length < 5 ? 1 : Math.ceil(candidates.length / columns)

          let index = 0
          const table = []
          for (let i = 0; i < rows; i++) {
            const row = []
            for (let j = 0; j < columns; j++) {
              row.push(createElement('td', `--${candidates[index]}`))
              index++
            }

            table.push(createElement('tr', [row]))
          }

          return createElement('table', { style: { width: '100%' } }, [table])
        }
      })
    }

    return
  }

  // Autocompleteable is option
  if (autocompleteableStdin.substring(0, 1) === '-') {
    const candidates = []
    this.options.short[program].forEach(option => {
      // If only one dash is present, user requests all options
      if (`-${option}`.startsWith(autocompleteableStdin) || autocompleteableStdin === '-') {
        candidates.push(option)
      }
    })

    // Autocompletion resolved into one result
    if (candidates.length === 1) {
      const autocompleted = `${this.stdin.substring(0, pointer - 1)} -${candidates[0]}`
      const rest = `${this.stdin.substring(this.cursor)}`

      // Mutating Stdin mutates the cursor, so we've to wait to push it to the end
      const unwatch = this.$watch(() => this.cursor, () => {
        this.cursor = cursor + (candidates[0].length - autocompleteableStdin.length + 1)

        unwatch()
      })

      this.stdin = `${autocompleted}${rest}`

      return
    }

    // Autocompletion resolved into multiple result
    if (autocompleteableStdin === '-' || candidates.length > 1) {
      this.history.push({
        // Build table programmatically
        render: createElement => {
          const columns = candidates.length < 5 ? candidates.length : 4
          const rows = candidates.length < 5 ? 1 : Math.ceil(candidates.length / columns)

          let index = 0
          const table = []
          for (let i = 0; i < rows; i++) {
            const row = []
            for (let j = 0; j < columns; j++) {
              row.push(createElement('td', `-${candidates[index]}`))
              index++
            }

            table.push(createElement('tr', [row]))
          }

          return createElement('table', { style: { width: '100%' } }, [table])
        }
      })
    }
  }
}
```</details> 

### Event listeners

Event listeners trigger terminal behaviour under certain conditions like pressing a button. Pass an array of event listeners you want to bind via the `event-listeners` property. This library provides three event listeners per default which can be imported:

*   **Autocompletion**: Autocompletion when pressing "Tab" key
*   **History**: Cycle through history with "Arrow up key" and "Arrow down key"
*   **Search**: Search history with "Ctrl" and "r"

An event listener is called with the Vue.js component instance as argument.

## Slots

### Bar

It's possible to fully customize the terminal bar using slots as shown in the following. **Note**: If using the bar slot, the properties `hide-bar` and `title` will be ignored.

```html
<template>
  <vue-command :commands="commands">
    <div slot="bar">
      Pokedex
    </div>
  </vue-command>
</template>

Prompt

Customize the prompt with the prompt slot. Note: If using the prompt slot, the property prompt will be ignored and the CSS class term-ps has to be manually applied.

<template>
  <vue-command
    :commands="commands"
    prompt="neil">
    <span
      class="term-ps" 
      slot="prompt">
      {{ prompt }} ready to take off:
    </span>
  </vue-command>
</template>

Events

Event Type Description Note
input String Emits the current input
execute String Emits when executing command Built-in commands have to manually emit this event
executed String Emits after command execution Built-in commands have to manually emit this event. All helper methods emit this event

Browser support

This library uses the ResizeObserver to track if the terminals inner height changes. You may need a pollyfill to support your target browser.

Overwriting executed functions

To track when the executed property has been mutated, this library overwrites the functions add, clear and delete of it. That means if you plan to overwrite the named Set functions by yourself, this library won’t work.

Projects using vue-command

Chuck Norris API

The Chuck Norris jokes are comming from this API. This library has no relation to Chuck Norris or the services provided by the API.

Download Details:

Author: ndabAP

Live Demo: https://ndabap.github.io/vue-command/

GitHub: https://github.com/ndabAP/vue-command

#vuejs #vue #javascript #vue-js

What is GEEK

Buddha Community

A fully working, most feature-rich Vue.js terminal emulator
Aria Barnes

Aria Barnes

1625232484

Why is Vue JS the most Preferred Choice for Responsive Web Application Development?

For more than two decades, JavaScript has facilitated businesses to develop responsive web applications for their customers. Used both client and server-side, JavaScript enables you to bring dynamics to pages through expanded functionality and real-time modifications.

Did you know!

According to a web development survey 2020, JavaScript is the most used language for the 8th year, with 67.7% of people choosing it. With this came up several javascript frameworks for frontend, backend development, or even testing.

And one such framework is Vue.Js. It is used to build simple projects and can also be advanced to create sophisticated apps using state-of-the-art tools. Beyond that, some other solid reasons give Vuejs a thumbs up for responsive web application development.

Want to know them? Then follow this blog until the end. Through this article, I will describe all the reasons and benefits of Vue js development. So, stay tuned.

Vue.Js - A Brief Introduction

Released in the year 2014 for public use, Vue.Js is an open-source JavaScript framework used to create UIs and single-page applications. It has over 77.4 million likes on Github for creating intuitive web interfaces.

The recent version is Vue.js 2.6, and is the second most preferred framework according to Stack Overflow Developer Survey 2019.

Every Vue.js development company is widely using the framework across the world for responsive web application development. It is centered around the view layer, provides a lot of functionality for the view layer, and builds single-page web applications.

Some most astonishing stats about Vue.Js:

• Vue was ranked #2 in the Front End JavaScript Framework rankings in the State of JS 2019 survey by developers.

• Approximately 427k to 693k sites are built with Vue js, according to Wappalyzer and BuiltWith statistics of June 2020.

• According to the State of JS 2019 survey, 40.5% of JavaScript developers are currently using Vue, while 34.5% have shown keen interest in using it in the future.

• In Stack Overflow's Developer Survey 2020, Vue was ranked the 3rd most popular front-end JavaScript framework.

Why is Vue.Js so popular?

• High-speed run-time performance
• Vue.Js uses a virtual DOM.
• The main focus is on the core library, while the collaborating libraries handle other features such as global state management and routing.
• Vue.JS provides responsive visual components.

Top 7 Reasons to Choose Vue JS for Web Application Development

Vue js development has certain benefits, which will encourage you to use it in your projects. For example, Vue.js is similar to Angular and React in many aspects, and it continues to enjoy increasing popularity compared to other frameworks.

The framework is only 20 kilobytes in size, making it easy for you to download files instantly. Vue.js easily beats other frameworks when it comes to loading times and usage.

Take a look at the compelling advantages of using Vue.Js for web app development.

#1 Simple Integration

Vue.Js is popular because it allows you to integrate Vue.js into other frameworks such as React, enabling you to customize the project as per your needs and requirements.

It helps you build apps with Vue.js from scratch and introduce Vue.js elements into their existing apps. Due to its ease of integration, Vue.js is becoming a popular choice for web development as it can be used with various existing web applications.

You can feel free to include Vue.js CDN and start using it. Most third-party Vue components and libraries are additionally accessible and supported with the Vue.js CDN.

You don't need to set up node and npm to start using Vue.js. This implies that it helps develop new web applications, just like modifying previous applications.

The diversity of components allows you to create different types of web applications and replace existing frameworks. In addition, you can also choose to hire Vue js developers to use the technology to experiment with many other JavaScript applications.

#2 Easy to Understand

One of the main reasons for the growing popularity of Vue.Js is that the framework is straightforward to understand for individuals. This means that you can easily add Vue.Js to your web projects.

Also, Vue.Js has a well-defined architecture for storing your data with life-cycle and custom methods. Vue.Js also provides additional features such as watchers, directives, and computed properties, making it extremely easy to build modern apps and web applications with ease.

Another significant advantage of using the Vue.Js framework is that it makes it easy to build small and large-scale web applications in the shortest amount of time.

#3 Well-defined Ecosystem

The VueJS ecosystem is vibrant and well-defined, allowing Vue.Js development company to switch users to VueJS over other frameworks for web app development.

Without spending hours, you can easily find solutions to your problems. Furthermore, VueJs lets you choose only the building blocks you need.

Although the main focus of Vue is the view layer, with the help of Vue Router, Vue Test Utils, Vuex, and Vue CLI, you can find solutions and recommendations for frequently occurring problems.

The problems fall into these categories, and hence it becomes easy for programmers to get started with coding right away and not waste time figuring out how to use these tools.

The Vue ecosystem is easy to customize and scales between a library and a framework. Compared to other frameworks, its development speed is excellent, and it can also integrate different projects. This is the reason why most website development companies also prefer the Vue.Js ecosystem over others.

#4 Flexibility

Another benefit of going with Vue.Js for web app development needs is flexibility. Vue.Js provides an excellent level of flexibility. And makes it easier for web app development companies to write their templates in HTML, JavaScript, or pure JavaScript using virtual nodes.

Another significant benefit of using Vue.Js is that it makes it easier for developers to work with tools like templating engines, CSS preprocessors, and type checking tools like TypeScript.

#5 Two-Way Communication

Vue.Js is an excellent option for you because it encourages two-way communication. This has become possible with the MVVM architecture to handle HTML blocks. In this way, Vue.Js is very similar to Angular.Js, making it easier to handle HTML blocks as well.

With Vue.Js, two-way data binding is straightforward. This means that any changes made by the developer to the UI are passed to the data, and the changes made to the data are reflected in the UI.

This is also one reason why Vue.Js is also known as reactive because it can react to changes made to the data. This sets it apart from other libraries such as React.Js, which are designed to support only one-way communication.

#6 Detailed Documentation

One essential thing is well-defined documentation that helps you understand the required mechanism and build your application with ease. It shows all the options offered by the framework and related best practice examples.

Vue has excellent docs, and its API references are one of the best in the industry. They are well written, clear, and accessible in dealing with everything you need to know to build a Vue application.

Besides, the documentation at Vue.js is constantly improved and updated. It also includes a simple introductory guide and an excellent overview of the API. Perhaps, this is one of the most detailed documentation available for this type of language.

#7 Large Community Support

Support for the platform is impressive. In 2018, support continued to impress as every question was answered diligently. Over 6,200 problems were solved with an average resolution time of just six hours.

To support the community, there are frequent release cycles of updated information. Furthermore, the community continues to grow and develop with backend support from developers.



Wrapping Up

VueJS is an incredible choice for responsive web app development. Since it is lightweight and user-friendly, it builds a fast and integrated web application. The capabilities and potential of VueJS for web app development are extensive.

While Vuejs is simple to get started with, using it to build scalable web apps requires professionalism. Hence, you can approach a top Vue js development company in India to develop high-performing web apps.

Equipped with all the above features, it doesn't matter whether you want to build a small concept app or a full-fledged web app; Vue.Js is the most performant you can rely on.

Original source

 

#vue js development company #vue js development company in india #vue js development company india #vue js development services #vue js development #vue js development companies

NBB: Ad-hoc CLJS Scripting on Node.js

Nbb

Not babashka. Node.js babashka!?

Ad-hoc CLJS scripting on Node.js.

Status

Experimental. Please report issues here.

Goals and features

Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.

Additional goals and features are:

  • Fast startup without relying on a custom version of Node.js.
  • Small artifact (current size is around 1.2MB).
  • First class macros.
  • Support building small TUI apps using Reagent.
  • Complement babashka with libraries from the Node.js ecosystem.

Requirements

Nbb requires Node.js v12 or newer.

How does this tool work?

CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).

Usage

Install nbb from NPM:

$ npm install nbb -g

Omit -g for a local install.

Try out an expression:

$ nbb -e '(+ 1 2 3)'
6

And then install some other NPM libraries to use in the script. E.g.:

$ npm install csv-parse shelljs zx

Create a script which uses the NPM libraries:

(ns script
  (:require ["csv-parse/lib/sync$default" :as csv-parse]
            ["fs" :as fs]
            ["path" :as path]
            ["shelljs$default" :as sh]
            ["term-size$default" :as term-size]
            ["zx$default" :as zx]
            ["zx$fs" :as zxfs]
            [nbb.core :refer [*file*]]))

(prn (path/resolve "."))

(prn (term-size))

(println (count (str (fs/readFileSync *file*))))

(prn (sh/ls "."))

(prn (csv-parse "foo,bar"))

(prn (zxfs/existsSync *file*))

(zx/$ #js ["ls"])

Call the script:

$ nbb script.cljs
"/private/tmp/test-script"
#js {:columns 216, :rows 47}
510
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
true
$ ls
node_modules
package-lock.json
package.json
script.cljs

Macros

Nbb has first class support for macros: you can define them right inside your .cljs file, like you are used to from JVM Clojure. Consider the plet macro to make working with promises more palatable:

(defmacro plet
  [bindings & body]
  (let [binding-pairs (reverse (partition 2 bindings))
        body (cons 'do body)]
    (reduce (fn [body [sym expr]]
              (let [expr (list '.resolve 'js/Promise expr)]
                (list '.then expr (list 'clojure.core/fn (vector sym)
                                        body))))
            body
            binding-pairs)))

Using this macro we can look async code more like sync code. Consider this puppeteer example:

(-> (.launch puppeteer)
      (.then (fn [browser]
               (-> (.newPage browser)
                   (.then (fn [page]
                            (-> (.goto page "https://clojure.org")
                                (.then #(.screenshot page #js{:path "screenshot.png"}))
                                (.catch #(js/console.log %))
                                (.then #(.close browser)))))))))

Using plet this becomes:

(plet [browser (.launch puppeteer)
       page (.newPage browser)
       _ (.goto page "https://clojure.org")
       _ (-> (.screenshot page #js{:path "screenshot.png"})
             (.catch #(js/console.log %)))]
      (.close browser))

See the puppeteer example for the full code.

Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet macro is similar to promesa.core/let.

Startup time

$ time nbb -e '(+ 1 2 3)'
6
nbb -e '(+ 1 2 3)'   0.17s  user 0.02s system 109% cpu 0.168 total

The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx this adds another 300ms or so, so for faster startup, either use a globally installed nbb or use $(npm bin)/nbb script.cljs to bypass npx.

Dependencies

NPM dependencies

Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.

Classpath

To load .cljs files from local paths or dependencies, you can use the --classpath argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs relative to your current dir, then you can load it via (:require [foo.bar :as fb]). Note that nbb uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar in the namespace name becomes foo_bar in the directory name.

To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:

$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"

and then feed it to the --classpath argument:

$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]

Currently nbb only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar files will be added later.

Current file

The name of the file that is currently being executed is available via nbb.core/*file* or on the metadata of vars:

(ns foo
  (:require [nbb.core :refer [*file*]]))

(prn *file*) ;; "/private/tmp/foo.cljs"

(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"

Reagent

Nbb includes reagent.core which will be lazily loaded when required. You can use this together with ink to create a TUI application:

$ npm install ink

ink-demo.cljs:

(ns ink-demo
  (:require ["ink" :refer [render Text]]
            [reagent.core :as r]))

(defonce state (r/atom 0))

(doseq [n (range 1 11)]
  (js/setTimeout #(swap! state inc) (* n 500)))

(defn hello []
  [:> Text {:color "green"} "Hello, world! " @state])

(render (r/as-element [hello]))

Promesa

Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core namespace is included with the let and do! macros. An example:

(ns prom
  (:require [promesa.core :as p]))

(defn sleep [ms]
  (js/Promise.
   (fn [resolve _]
     (js/setTimeout resolve ms))))

(defn do-stuff
  []
  (p/do!
   (println "Doing stuff which takes a while")
   (sleep 1000)
   1))

(p/let [a (do-stuff)
        b (inc a)
        c (do-stuff)
        d (+ b c)]
  (prn d))
$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while
3

Also see API docs.

Js-interop

Since nbb v0.0.75 applied-science/js-interop is available:

(ns example
  (:require [applied-science.js-interop :as j]))

(def o (j/lit {:a 1 :b 2 :c {:d 1}}))

(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1

Most of this library is supported in nbb, except the following:

  • destructuring using :syms
  • property access using .-x notation. In nbb, you must use keywords.

See the example of what is currently supported.

Examples

See the examples directory for small examples.

Also check out these projects built with nbb:

API

See API documentation.

Migrating to shadow-cljs

See this gist on how to convert an nbb script or project to shadow-cljs.

Build

Prequisites:

  • babashka >= 0.4.0
  • Clojure CLI >= 1.10.3.933
  • Node.js 16.5.0 (lower version may work, but this is the one I used to build)

To build:

  • Clone and cd into this repo
  • bb release

Run bb tasks for more project-related tasks.

Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb 
License: EPL-1.0

#node #javascript

sophia tondon

sophia tondon

1618971133

Top 10 VueJS Development Companies To Know In 2021-22

Vue.js is one of the most used and popular frontend development, or you can say client-side development framework. It is mainly used to develop single-page applications for both web and mobile. Famous companies like GitLab, NASA, Monito, Adobe, Accenture are currently using VueJS.

Do You Know?

Around 3079 companies reportedly use Vue.js in their tech stacks.
At GitHub, VueJS got 180.9K GitHub stars, including 28.5K GitHub forks.
Observing the increasing usage of VueJS and its robust features, various industry verticals are preferring to develop the website and mobile app Frontend using VueJS, and due to this reason, businesses are focusing on hiring VueJS developers from the top Vue.js development companies.

But the major concern of the enterprises is how to find the top companies to avail leading VueJS development service? Let’s move further and know what can help you find the best VueJS companies.

Read More - https://www.valuecoders.com/blog/technology-and-apps/top-10-vuejs-development-companies/

#hire vue js developer #hire vue.js developers #hire vue.js developer, #hire vue.js developers, #vue js development company #vue.js development company

Luna  Mosciski

Luna Mosciski

1600583123

8 Popular Websites That Use The Vue.JS Framework

In this article, we are going to list out the most popular websites using Vue JS as their frontend framework.

Vue JS is one of those elite progressive JavaScript frameworks that has huge demand in the web development industry. Many popular websites are developed using Vue in their frontend development because of its imperative features.

This framework was created by Evan You and still it is maintained by his private team members. Vue is of course an open-source framework which is based on MVVM concept (Model-view view-Model) and used extensively in building sublime user-interfaces and also considered a prime choice for developing single-page heavy applications.

Released in February 2014, Vue JS has gained 64,828 stars on Github, making it very popular in recent times.

Evan used Angular JS on many operations while working for Google and integrated many features in Vue to cover the flaws of Angular.

“I figured, what if I could just extract the part that I really liked about Angular and build something really lightweight." - Evan You

#vuejs #vue #vue-with-laravel #vue-top-story #vue-3 #build-vue-frontend #vue-in-laravel #vue.js

Top VueJS App Development Company in USA

AppClues Infotech is the best & most reliable VueJS App Development Company in USA that builds high-quality and top-notch mobile apps with advanced methodology. The company is focused on providing innovative & technology-oriented solutions as per your specific business needs.

The organization’s VueJS developers have high experience and we have the capability of handling small to big projects. Being one of the leading mobile app development company in USA we are using the latest programming languages and technologies for their clients.

Key Elements:

· Total year of experience - 8+

· Employees Strength - 120+

· Hourly Rate - $25 – $45 / hr

· Location - New York, USA

· Successfully launched projects - 450+

VueJS Development Services by AppClues Infotech

· Custom VueJS Development

· Portal Development Solutions

· Web Application Development

· VueJS Plugin Development

· VueJS Ecommerce Development

· SPA (Single Page App) Development

· VueJS Migration

Why Hire VueJS Developers from AppClues Infotech?

· Agile & Adaptive Development

· 8+ Years of Average Experience

· 100% Transparency

· Guaranteed Bug-free VueJS Solution

· Flexible Engagement Models

· On-Time Project Delivery

· Immediate Technical Support

If you have any project ideas for VueJS app development then share your requirements with AppClues Infotech to get the best solution for your dream projects.

For more info:
Share Yoru Requirements: https://www.appcluesinfotech.com/contact-us/
Email: info@appcluesinfotech.com
Call: +1-978-309-9910
**

#top vue.js development company #vue.js app development company #best vue js development company #hire top vue js developers #hire top vue.js developers in usa #vue js development company usa