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Vintage Terminal

A Pen By Jakub Jankiewicz

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HTML

            
              <div class="tv">
    <div id="term"></div>
    <div class="scanlines"></div>
</div>
!

CSS

            
              /*
 * style based on http://js13kgames.com/entries/lost-in-cyberspace
 */
body {
    margin: 0;
    background: black;
}
#term {
    height: 100vh;
    --background: #031e11;
    --size: 1.5;
}
/* to see yourself like in a mirror */
.self {
    transform: scale(-1, 1);
}
/* flicker animation taken from http://goonhub.com/secret */
#term::after {
    content: " ";
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: rgba(18, 16, 16, 0.2);
    opacity: 0;
    z-index: 2;
    pointer-events: none;
    animation: flicker 0.12s infinite;
}
@keyframes flicker {
  0% {
    opacity: 0.552;
  }
  5% {
    opacity: 0.48287;
  }
  10% {
    opacity: 0.59134;
  }
  15.0% {
    opacity: 0.79543;
  }
  20% {
    opacity: 0.75134;
  }
  25% {
    opacity: 0.1956;
  }
  30.0% {
    opacity: 0.90687;
  }
  35% {
    opacity: 0.122;
  }
  40% {
    opacity: 0.62254;
  }
  45% {
    opacity: 0.56977;
  }
  50% {
    opacity: 0.9925;
  }
  55.0% {
    opacity: 0.55487;
  }
  60.0% {
    opacity: 0.16607;
  }
  65% {
    opacity: 0.12353;
  }
  70% {
    opacity: 0.2214;
  }
  75% {
    opacity: 0.67908;
  }
  80% {
    opacity: 0.97163;
  }
  85.0% {
    opacity: 0.1275;
  }
  90% {
    opacity: 0.37186;
  }
  95% {
    opacity: 0.24475;
  }
  100% {
    opacity: 0.37221;
  }
}
/*
 * reference: https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-within
 */
.cmd:focus-within .prompt {
    color: red;
}
/* glow */
.terminal {
    text-shadow: 0 0.2rem 1rem #0c7b46;
}
/* based on
https://blog.carbonfive.com/2015/01/07/vintage-terminal-effect-in-css3/
*/
.scanlines {
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: linear-gradient(
        to bottom,
        rgba(255,255,255,0),
        rgba(255,255,255,0) 50%,
        rgba(0,0,0,.2) 70%,
        rgba(0,0,0,.6)
    );
    background-size: 100% .3rem;
    position: fixed;
    pointer-events: none;
}
.scanlines:before {
  position: absolute;
  top: 0px;
  width: 100%;
  height: 5px;
  background: #fff;
  background: linear-gradient(to bottom,
      rgba(255,0,0,0) 0%,
      rgba(255,250,250,1) 50%,
      rgba(255,255,255,0.98) 51%,
      rgba(255,0,0,0) 100%
  ); /* W3C */
  opacity: .1;
}
.scanlines:after {
  box-shadow: 0 2px 6px rgba(25,25,25,0.2),
      inset 0 1px rgba(50,50,50,0.1),
      inset 0 3px rgba(50,50,50,0.05),
      inset 0 3px 8px rgba(64,64,64,0.05),
      inset 0 -5px 10px rgba(25,25,25,0.1);
}

#term:focus-within + .scanlines:before {
  content: '';
  animation: vline calc(var(--time, 2) * 1s) linear infinite;
}
/*
 * MS Edge don't support focus-within and css vars
 * inside pseudo selector
 */
@supports (-ms-ime-align:auto) {
    .scanlines:before {
        content: '';
        animation: vline 3s linear infinite;
    }
}
@keyframes vline {
  to { transform: translate(0, 100vh)}
}
/* turn off animation */
.tv {
    height: 100vh;
    position: relative;
}
.tv.collapse {
    animation: size 2s ease-out;
    animation-fill-mode: forwards;
}
.tv.collapse:before {
    content: '';
    display: block;
    height: 100%;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    background: white;
    z-index: 1;
    opacity: 0;
    animation: opacity 2s ease-out;
    animation-fill-mode: forwards;
}

@keyframes opacity {
    to { opacity: 1; }
}
@keyframes size {
    50% {
        transform: scaleX(calc(1 / var(--width)));
        opacity: 1;
    }
    98% {
        transform: scaleX(calc(1 / var(--width))) scaleY(calc(1 / var(--height)));
        opacity: 1;
    }
    100% {
        transform: scaleX(calc(1 / var(--width))) scaleY(calc(1 / var(--height)));
        opacity: 0;
    }  
}
!

JS

            
              var scanlines = $('.scanlines');
var tv = $('.tv');
var term = $('#term').terminal(function(command, term) {
    if (command.match(/^\s*exit\s*$/)) {
        $('.tv').addClass('collapse');
        term.disable();
    } else if (command !== '') {
        try {
            var result = window.eval(command);
            if (result !== undefined) {
                term.echo(new String(result));
            }
        } catch(e) {
            term.error(new String(e));
        }
    } else {
        term.echo('');
    }
}, {
    name: 'js_demo',
    onResize: set_size,
    exit: false,
    // detect iframe codepen preview
    enabled: $('body').attr('onload') === undefined,
    onInit: function() {
        set_size();
        this.echo('Type [[b;#fff;]exit] to see turn off animation.');
        this.echo('Type and execute grab() function to get the scre' +
                  'enshot from your camera');
        this.echo('Type camera() to get video and pause()/play() to stop/play');
    },
    prompt: 'js> '
});
function set_size() {
    // for window height of 170 it should be 2s
    var height = $(window).height();
    var width = $(window).width()
    var time = (height * 2) / 170;
    scanlines[0].style.setProperty("--time", time);
    tv[0].style.setProperty("--width", width);
    tv[0].style.setProperty("--height", height);
}

function tree(obj) {
    term.echo(treeify.asTree(obj, true, true));
}
function camera() {
    if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        term.pause();
        var media = navigator.mediaDevices.getUserMedia({video: true});
        media.then(function(mediaStream) {
            term.resume();
            term.echo('<video data-play="true" class="self"></video>', {
                raw: true,
                finalize: function(div) {
                    var video = div.find('video');
                    if (!video.length) {
                        return;
                    }
                    video[0].src = window.URL.createObjectURL(mediaStream);
                    if (video.data('play')) {
                        video[0].play();
                    }
                }
            });
        });
    }
}
var play = function() {
    var video = term.find('video').slice(-1);
    if (video.length) {
        video[0].play();
    }
}
function pause() {
    term.find('video').each(function() {
        this.pause(); 
    });
}
function grab() {
    if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        term.pause();
        var media = navigator.mediaDevices.getUserMedia({video: true});
        media.then(function(mediaStream) {
            const mediaStreamTrack = mediaStream.getVideoTracks()[0];
            const imageCapture = new ImageCapture(mediaStreamTrack);
            return imageCapture.takePhoto();
        }).then(function(blob) {
            term.echo('<img src="' + URL.createObjectURL(blob) + '" class="self"/>', {
                raw: true,
                finialize: function(div) {
                    div.find('img').on('load', function() {
                        URL.revokeObjectURL(this.src);
                    });
                }
            }).resume();
        }).catch(function(error) {
            term.error('Device Media Error: ' + error);
        });
    }
}


github('jcubic/jquery.terminal');
!
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