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Vintage Terminal

A Pen By Jakub Jankiewicz

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HTML

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

CSS

            
              /*
 * style based on http://js13kgames.com/entries/lost-in-cyberspace
 */
body {
    margin: 0;
}
#term {
    height: 100vh;
    --background: #031e11;
    --size: 1.5;
}
/*
 * reference: https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-within
 */
.cmd:focus-within .prompt {
    color: red;
}
.terminal {
    text-shadow: 0 0.2rem 1rem #0c7b46;
}
.terminal a:hover {
    background: #0F60FF;
    color: var(--background, #aaa);
    text-decoration: none;
}
.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;
}
/* based on
https://blog.carbonfive.com/2015/01/07/vintage-terminal-effect-in-css3/
*/
.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;
}
@keyframes vline {
  to { transform: translate(0, 100vh)}
}
/* turn off animation */
.tv {
    height: 100vh;
    position: relative;
}
.white {
    content: '';
    display: block;
    height: 100%;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    background: white;
    z-index: 1;
    opacity: 0;
    animation: opacity 5s ease-out infinite;
    animation-fill-mode: forwards;
}

@keyframes opacity {
    0%: { opacity: 0.1 }
    100%: { opacity: 1; }
}
!

JS

            
              // for browsers that don't support key property
keyboardeventKeyPolyfill.polyfill();
var scanlines = $('.scanlines');
var term = $('#term').terminal(function(command, term) {
    if (command.match(/^\s*exit\s*$/)) {
        $('.tv').addClass('collapse');
        term.disable();
    } else if (command !== '') {
        try {
            var result = window.eval(command);
            if (result !== undefined) {
                term.echo(new String(result));
            }
        } catch(e) {
            term.error(new String(e));
        }
    } else {
        term.echo('');
    }
}, {
    name: 'js_demo',
    onResize: set_time,
    exit: false,
    onInit: set_time,
    prompt: 'js> '
});
function set_time() {
    // for window heihgt of 170 it should be 2s
    var time = ($(window).height() * 2) / 170;
    scanlines[0].style.setProperty("--time", time);
}
!
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