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muboard
/
muboard.min.js

!function(){"use strict";const i="Muboard",a="0.5.0";let d,r,s,e=null;const l={};const c={green:`
html {height: 100%}
body {
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}
main {
  background: #255; color: #eed;
  border: 0.75em ridge #933; padding: 1em; box-sizing: border-box;
  width: 100%; height: 66%; resize: both; overflow: auto;
}
textarea {
  background: #111; color: #9c9; display: block; margin-top: 0.75rem;
  border-width: 0.125rem; padding: 0.375rem; box-sizing: border-box;
  width: 100%; height: calc(34% - 0.75em);
}
pre, code, samp, kbd {color: #dec; font-family: monospace, monospace}
h1 {font-size: 1.5em}
h2 {font-size: 1.25em}
h1, h2, h3, h4, h5, h6 {margin: 1em 0 0.5em 0; line-height: 1.2}
main > :first-child, main > :first-child > :first-child {margin-top: 0}
section > :first-child, section > :first-child > :first-child {margin-top: 0}
a:link, a:visited {color: #ccf}
a:hover, a:active {color: #e76}
hr {border: 0; border-bottom: thin solid #fbc}
.center {text-align: center}
article {max-width: 40em; margin: 0 auto}
main > section {display: flex}
main > section > section {
  display: block; flex-basis: 100%; padding: 0 0.5em;
}
main > section > section:first-child {padding-left: 0}
main > section > section:last-child {padding-right: 0}
table {border-collapse: collapse}
th, td {border: thin solid #bed; padding: 0.3em 0.4em; text-align: left}
footer {margin: 1em 0; text-align: center; display: none}
footer a {margin-right: 1em}
footer a:last-child {margin-right: 0}
footer a:link, footer a:visited {color: #03c}
footer a:hover, a:active {color: #06f}
`};function m(){r.innerHTML=window.texme.render(d.value),window.MathJax.texReset(0),window.MathJax.typeset()}function h(){u(),e=window.setTimeout(m,l.renderDelay)}function u(){null!==e&&(window.clearTimeout(e),e=null)}function p(e,t,o){var n=d.selectionStart,i=n-e.length,e=i+t.length;const a=d.value;u(),d.value=a.substr(0,i)+t+o+a.substr(n),d.setSelectionRange(e,e),u()}function w(e){var t=d.selectionStart;let o;o=t<=10?d.value.substr(0,t):d.value.substr(t-10,10);var n,t=o.lastIndexOf(",");if(-1!==t)switch(o.substr(t)){case",clear":u(),r.innerHTML=d.value="",m();break;case",i":p(",i","$ "," $"),m();break;case",d":p(",d","$$ "," $$"),m();break;case",align;":p(",align;","\\begin{align}\n","\n\\end{align}"),m();break;case",align*":p(",align*","\\begin{align*}\n","\n\\end{align*}"),m();break;case",article":p(",article","<article>\n\n","\n\n</article>"),m();break;case",split":p(",split","<section>\n<section>\n\n","\n\n</section>\n<section>\n\n\n\n</section>\n</section>"),m();break;case",section":p(",section","<section>\n\n","\n\n</section>"),m();break;case",center":p(",center",'<div class="center">\n\n',"\n\n</div>"),m();break;case",save":p(",save","",""),m(),setTimeout(b,10);break;case",load":p(",load","",""),m(),setTimeout(f,10);break;case",remove":p(",remove","",""),m(),setTimeout(g,10);break;case",list":p(",list","",""),m(),function(){if(0!==window.localStorage.length){let t=`<article>
<h1>Saved Keys</h1>
<p>
The following Muboard keys are saved in the local storage of your
browser:
</p>
<ol>`;for(let e=0;e<window.localStorage.length;e++)t+="<li>"+window.localStorage.key(e)+"</li>";t+=`</ol>
<p>
Type <code>,load</code> to load any key.
</p>
</article>`,r.innerHTML=t}else r.innerHTML="<article><h1>No Keys Found</h1></article>"}();break;case",footer":p(",footer","",""),m(),n=s.style.display,s.style.display="none"===n?"block":"none";break;case",help":p(",help","",""),r.innerHTML=`
<article>
<h1>${i}</h1>
<p>
Muboard is a web-based mathematics display board. Muboard lets you
scribble mathematics using LaTeX and Markdown while presenting your
desktop screen.
</p>
<h2>Commands</h2>
<p>
The following commands that may be typed anywhere in the input text
field:
</p>
<dl>
  <dt><code>,clear</code></dt>
  <dd>Clear text input field and the board.</dd>

  <dt><code>,i</code></dt>
  <dd>Insert inline mathematics.</dd>

  <dt><code>,d</code></dt>
  <dd>Insert display mathematics.</dd>

  <dt><code>,align;</code></dt>
  <dd>Insert align envrionment.</dd>

  <dt><code>,align*</code></dt>
  <dd>Insert align* environment.</dd>

  <dt><code>,article</code></dt>
  <dd>
    Insert article element. The article element is displayed as a
    single column of text at the center of the board with a fixed
    maximum width that makes the text easier to read. Recommended for
    distributable boards.
  </dd>

  <dt><code>,split</code></dt>
  <dd>
    Split the board into two side-by-side columnar sections. More
    columnar sections may be added with the next command.
  </dd>

  <dt><code>,section</code></dt>
  <dd>Insert section element.</dd>

  <dt><code>,center</code></dt>
  <dd>Insert center-aligned text.</dd>

  <dt><code>,save</code></dt>
  <dd>Save current input to the browser's local storage.</dd>

  <dt><code>,load</code></dt>
  <dd>Load an input from the browser's local storage.</dd>

  <dt><code>,remove</code></dt>
  <dd>Remove an input from the browser's local storage.</dd>

  <dt><code>,list</code></dt>
  <dd>List all inputs saved in the browser's local storage.</dd>

  <dt><code>,footer</code></dt>
  <dd>Toggle the display of footer at the bottom of the page.</dd>

  <dt><code>,help</code></dt>
  <dd>Show this help message.</dd>

  <dt><code>,example</code></dt>
  <dd>Show demo example content on board.</dd>

  <dt><code>,version</code></dt>
  <dd>Show version and license information.</dd>
</dl>
<p>
You can type the above commands anywhere in the input text field to
invoke them. For example, type <code>,i</code> anywhere in input text
field and it will be immediately replaced with LaTeX delimiters for
inline math.
</p>
<p>
${i} can also be used to create distributable boards with Markdown
+ LaTeX content saved in it. See <a
href="https://github.com/susam/muboard">github.com/susam/muboard</a>
for more details.
</p>
<hr style="margin: 1em 0">
<div style="font-size: small; text-align: center">
<p>
${i} is created and maintained by <a
href="https://twitter.com/intent/follow?screen_name=susam">Susam</a>.
</p>
<p>
The source code is available on
<a href="https://github.com/susam/muboard">GitHub</a>.
</p>
</div>
</article>
`;break;case",example":p(",example","",""),d.value=`<article>

# The Möbius function

For any positive integer $ n $, the Möbius function $ \\mu(n) $ is
defined as follows:

$$ \\mu(1) = 1; $$

If $ n > 1, $ write $ n = p_1^{a_1} \\dots p_2^{a_k} $ (prime
factorization). Then

\\begin{align*}
  \\mu(n) & = (-1)^k \\text{ if } a_1 = a_2 = \\dots = a_k = 1, \\\\
  \\mu(n) & = 0 \\text{ otherwise}.
\\end{align*}

If $ n \\ge 1, $ we have

$$
  \\sum_{d \\mid n} \\mu(d) =
  \\begin{cases}
    1 & \\text{ if } n = 1, \\\\
    0 & \\text{ if } n > 1.
  \\end{cases}
$$

</article>`,m();break;case",version":p(",version","",""),r.innerHTML=`
<article>
<h1>${i} ${a}</h1>
<p>
Copyright &copy; 2021 Susam Pal
</p>
<p>
This is free and open source software. You can use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of it,
under the terms of the <a
href="https://github.com/susam/muboard/blob/master/LICENSE.md">MIT
License</a>.
</p>
<p>
This software is provided <em>"as is"</em>, <em>without
warranty of any kind</em>, express or implied. See the MIT License
for details.
</p>
</article>
`;break;default:h()}else h()}function t(){const e=window.document.getElementsByTagName("textarea");r=window.document.createElement("main"),d=window.document.createElement("textarea"),d.placeholder=`Write content in LaTeX + Markdown format here.

Type ,help for help.

Type ,example for demo.`,s=window.document.createElement("footer"),s.innerHTML=`
<a href="https://github.com/susam/muboard">GitHub</a>
<a href="https://twitter.com/intent/follow?screen_name=susam">Twitter</a>
<a href="https://github.com/susam/muboard/blob/master/LICENSE.md">License</a>
`,0<e.length?(d.value=e[0].value.trim(),e[0].remove()):(d.value=window.document.body.innerHTML.trim(),window.document.body.innerHTML=""),void 0!==window.document.title&&""!==window.document.title||(window.document.title=i),window.document.body.appendChild(r),window.document.body.appendChild(d),window.document.body.appendChild(s),d.focus();const t=window.document.createElement("style");var o=c.green;t.appendChild(window.document.createTextNode(o)),window.document.head.appendChild(t);const n=window.document.createElement("meta");n.name="viewport",n.content="width=device-width, initial-scale=1.0",window.document.head.appendChild(n),l.footer&&(s.style.display="block"),m(),d.addEventListener("input",w)}function b(){const e="Provide a key name to save the current input to the browser's local storage.\n\nYou can use the same key to load the input later.";var t=window.prompt(e);if(null!==t)if(""!==t)if(/\s/.test(t))r.innerHTML=`<article>
<h1>Error</h1>
<p>Key cannot have whitespace.</p>
</article>`;else{if(null!==window.localStorage.getItem(t)){const e="A key with the given name already exists.\n\nDo you want to overwrite the same key?";if(!1===window.confirm("A key with the given name already exists.\n\nDo you want to overwrite the same key?"))return}window.localStorage.setItem(t,d.value)}else r.innerHTML=`<article>
<h1>Error</h1>
<p>Key cannot be empty string.</p>
</article>`}function f(){var e=window.prompt("Provide a key name to load input from the browser's local storage."),e=window.localStorage.getItem(e);null!==e?(d.value=e,m()):r.innerHTML=`<article>
<h1>Error</h1>
<p>Key does not exist.</p>
</article>`}function g(){var e=window.prompt("Provide name of key to remove from browser's local storage.");null!==window.localStorage.getItem(e)?window.localStorage.removeItem(e):r.innerHTML=`<article>
<h1>Error</h1>
<p>Key does not exist.</p>
</article>`}l.texmeURL="https://cdn.jsdelivr.net/npm/texme@1.0.0",l.renderDelay=200,l.footer=!1,function(){let e;for(e in l)"undefined"!=typeof window&&void 0!==window.muboard&&void 0!==window.muboard[e]&&(l[e]=window.muboard[e])}(),window.texme={renderOnLoad:!1},function(e,t){const o=window.document.createElement("script");o.src=e,o.onload=t,window.document.head.appendChild(o)}(l.texmeURL),window.addEventListener("load",t)}();