html/squine.html


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130#!/usr/bin/python3
"""Run all the tests inside the test/ directory as a test suite."""
if __name__ == '__main__':
	import unittest
	from test import *

	tests = []
	for key, val in vars().copy().items():
		if key.startswith('tc_'):
			tests.extend(v for k,v in vars(val).items() if type(v) == type)

	suite = unittest.TestSuite(map(unittest.makeSuite, tests))
	unittest.TextTestRunner(verbosity=2).run(suite)
<!DOCTYPE html>
<html lang="en">
<head>
    <!--
MIT License

Copyright (c) m15o

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
-->
    <meta charset="utf-8">
    <title>squine</title>
</head>
<style>
    html, body, #app, .column, textarea, table, td {
        height: 100%;
    }

    body {
        padding: 0;
        margin: 0;
        background: linear-gradient(to bottom, #e4d16f, #d5363d);
    }

    header {
        display: flex;
        border-bottom: 1px solid;
        border-top: 1px solid;
    }

    header > * {
        border-right: 1px solid;
    }

    .column {
        display: flex;
        flex-direction: column;
        min-width: 10px;
    }

    article, section {
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    .name {
        box-sizing: border-box;
        width: 100%;
        padding: 2px 5px;
        margin: 0;
        outline: none;
        border: 0;
        border-right: 1px solid;
        background-color: #fffad6;
    }

    #search {
        display: none;
    }

    #search.searching {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background-color: darkblue;
        color: white;
    }

    textarea {
        box-sizing: border-box;
        padding: 5px;
        margin: 0;
        border: 0;
        outline: none;
        resize: none;
        background-color: #fff9e9;
    }

    .action {
        padding: 2px 5px;
        cursor: pointer;
    }

    .back, .forward {
        background-color: silver;
    }

    .hist {
        background-color: inherit;
    }

    .folded article, .folded .h-resize, .maxed .h-resize {
        display: none;
    }

    .maxed article {
        display: flex;
    }

    .folded .maxed, .maxed article {
        flex-grow: 1;
    }

    section:last-child, section:last-child article {
        flex-grow: 1;
    }

    .folded section {
        flex-grow: 0;
    }

    table {
        width: 100%;
        border-collapse: collapse;
    }

    td {
        padding: 0;
        border: 1px solid;
    }

    .menu > * {
        padding: 0 4px;
        cursor: pointer;
    }

    .menu > *:hover {
        background-color: #dfad6a;
    }

    .active-p .content {
        background-color: white;
    }

    .active {
        background-color: #e5d575;
    }

    .col {
        position: relative;
    }

    .h-resize:hover, .resize:hover {
        background-color: rebeccapurple;
    }

    .resize {
        width: 2px;
        background-color: silver;
        cursor: col-resize;
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
    }

    #settings {
        display: none;
    }

    #settings.visible {
        display: table-row;
    }

    .dirty .save {
        background-color: aquamarine;
    }

    .h-resize {
        height: 2px;
        background-color: darkgrey;
        cursor: row-resize;
    }

    .parse {
        background-color: #dfad6a;
    }
</style>
<body>
<div id="app"></div>
<script>
    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Helpers

    function $(elt) {
        return document.querySelector(elt);
    }

    function $$(elt) {
        return document.querySelectorAll(elt);
    }

    function $$active(elt) {
        return $panel => ($panel && $panel.querySelector(elt)) || $('.active-p ' + elt);
    }

    function $name($panel) {
        return $$active('.name')($panel);
    }

    function $content($panel) {
        return $$active('.content')($panel);
    }

    function t$(e) {
        return e.target;
    }

    function closest$(e, sel) {
        return t$(e).closest(sel);
    }

    function $search() {
        return $('#search');
    }

    function $panel() {
        return $('.active-p');
    }

    function hasCls($elt, cls) {
        return $elt.classList.contains(cls);
    }

    function date() {
        return (new Date()).toLocaleDateString('en-CA');
    }

    function makeElt(elt, cls, attrs, html, value) {
        let e = document.createElement(elt);
        cls.forEach(c => e.classList.add(c));
        Object.keys(attrs).forEach(k => e.setAttribute(k, attrs[k]));
        html && (e.innerHTML = html);
        value && (e.value = value);
        return e;
    }

    function togCls(cls, sel, $elt) {
        $$(sel).forEach((e) => e.classList.remove(cls));
        $elt.classList.add(cls);
    }

    function setActive($section) {
        togCls('active-p', 'section', $section);
    }

    function closeSearch() {
        $search().classList.remove('searching');
        $content().focus();
    }

    function refPane(name) {
        let p;
        $$('section').forEach(e => e.querySelector('.name').value.startsWith('+ref') && (p = e));
        if (!p) {
            p = createPane();
        }
        setActive(p);
        load(name);
        return p;
    }

    function runPane(content) {
        let p;
        save();
        let old = $panel();
        $$('section').forEach(e => e.querySelector('.name').value.startsWith('+run') && (p = e));
        let err, rv;
        storeKeys().forEach(k => {
            if (k === 'main') return;
            try {
                global[k] = eval(global, parse(storeGet(k)), true);
            } catch (e) {
                err = `in ${k}: ${e}`
            }
        });
        if (!p) {
            p = createPane();
            load('+run');
        }
        setActive(p);
        if (err) {
            $content().value = err;
            return;
        }
        try {
            $content().value = asString(exec(storeGet('main')));
        } catch (e) {
            $content().value = e;
        }
        setActive(old);
        $content().focus();
    }


    // function runPane(content) {
    //     let p;
    //     $$('section').forEach(e => e.querySelector('.name').value.startsWith('+run') && (p = e));
    //     let err, rv;
    //     try {
    //         if ($name().value !== 'main') {
    //             global[$name().value] = eval(global, parse(content), true);
    //             rv = asString(global[$name().value]);
    //         }
    //     } catch (e) {
    //         err = e;
    //     }
    //
    //     if (!p) {
    //         p = createPane();
    //         load('+run');
    //     }
    //     setActive(p);
    //     if (err) {
    //         $content().value = err;
    //         return;
    //     }
    //     if (rv) {
    //         $content().value = rv;
    //         return;
    //     }
    //     try {
    //         $content().value = asString(exec(content));
    //     } catch (e) {
    //         $content().value = e;
    //     }
    // }

    function isChordNav(e) {
        return e.metaKey || e.ctrlKey;
    }

    function isChordNavBlank(e) {
        return isChordNav(e) && e.altKey;
    }

    function navBlank(name) {
        findOrCreatePane(name);
    }

    function debounce(fn, ms) {
        let timeout;
        return (...args) => {
            clearTimeout(timeout);
            timeout = setTimeout(() => fn(...args), ms);
        }
    }

    function basename(path) {
        const n = path.split('/').pop();
        return n.split('.').shift();
    }

    function download(data, name, mime) {
        const link = document.createElement('a');
        link.download = name;
        link.href = window.URL.createObjectURL(new Blob([data], {type: mime}));
        document.body.appendChild(link);
        link.click();
        document.body.removeChild(link);
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // storage

    let store = {};

    function storeSet(k, v) {
        if (isStoreKey(k) && v === storeGet(k, v)) return;
        $('#app').classList.add('dirty');
        store[k] = v;
    }

    function storeGet(k) {
        return store[k] || '';
    }

    function storeDel(k) {
        delete store[k];
    }

    function storeKeys(sorted) {
        let rv = Object.keys(store);
        if (sorted) return rv.sort();
        return rv;
    }

    function isStoreKey(k) {
        return storeKeys().includes(k);
    }

    function storeClear() {
        store = {};
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Core

    function save() {
        let name = $name().value;
        let content = $content().value;
        $panel().dataset['name'] = name;
        if (!name || name === '+run') return;
        storeSet(name, content);
        refresh();
    }

    const saveD = debounce(save, 200);

    function updateHistory(name) {
        let cname = $panel().dataset['name'];
        if (!name || name === cname) return;
        hpush(hist().back, cname);
        hist().forward = [];
    }

    function ls(prefix) {
        return storeKeys(true).filter(k => !prefix || k.startsWith(prefix)).join('\n');
    }

    function orph() {
        return storeKeys().map(k => {
            const v = storeGet(k);
            const m = [...v.matchAll(/\[\[([\w\.\-]+)\]\]/g)].map(match => match[1]);
            const r = m.filter(e => !storeGet(e));
            if (!r.length) return null;
            return ['[[' + k + ']]', '----------', ...r.map(e => '[[' + e + ']]'), ''].join('\n');
        }).filter(Boolean).join('\n');
    }

    function load(name, noHist) {
        if (!name) {
            $name().value = '';
            $content().value = '';
            return;
        }
        !noHist && updateHistory(name)
        if (name === '+orph') {
            $content().value = orph();
        } else if (name.startsWith('+ls')) {
            $content().value = ls(name.split(':')[1]);
        } else if (name.startsWith('+search')) {
            $content().value = name.split(':')[1] ? lookup(name.split(':')[1]) : '';
        } else if (name.startsWith('+ref')) {
            $content().value = name.split(':')[1] ? lookup('[[' + name.split(':')[1] + ']]') : '';
        } else {
            $content().value = storeGet(name);
        }
        $name().value = name;
        $panel().dataset['name'] = name;
        $panel().querySelector('.back').classList.toggle('hist', !!hist().back.length);
        $panel().querySelector('.forward').classList.toggle('hist', !!hist().forward.length);
    }

    function refresh() {
        let $elt = $('#files');
        $elt.innerHTML = '';
        storeKeys().forEach(k => $elt.appendChild(makeElt('option', [], {}, null, k)));
        $elt = $('#globals');
        $elt.innerHTML = '';
        Object.keys(global).forEach(k => $elt.appendChild(makeElt('option', [], {}, null, k)));
    }

    let paneID = 0;

    function createHistory(paneID) {
        history[paneID] = {back: [], forward: []};
    }

    function removeHistory(paneID) {
        delete history[paneID];
    }

    function deletePane($pane) {
        removeHistory($pane.dataset['id']);
        $pane.remove();
    }

    function createPane() {
        const header = document.createElement('header');
        header.append(
            makeElt('span', ['back', 'action'], {}, '<'),
            makeElt('span', ['forward', 'action'], {}, '>'),
            makeElt('input', ['name'], {list: 'files', autocomplete: 'off'}),
            makeElt('span', ['max', 'action'], {}, '+'),
            makeElt('span', ['move', 'action'], {}, '~'),
            makeElt('span', ['close', 'action'], {}, 'x')
        );
        const id = paneID++;
        const section = document.createElement('section');
        const article = document.createElement('article');
        article.append(makeElt('textarea', ['content'], {spellcheck: false, onkeyup: 'saveD()'}));
        section.setAttribute('data-id', '' + id);
        section.append(
            header,
            makeElt('div', ['parse'], {}),
            article,
            makeElt('div', ['h-resize'], {})
        );
        createHistory(id);
        $(".column.active").appendChild(section);
        setActive(section);
        $content().focus();
        return section;
    }

    function lookup(str) {
        return storeKeys(true).map(k => {
            const v = storeGet(k);
            const m = v.split('\n').filter(l => l.includes(str));
            if (!m.length) return null;
            return ['[[' + k + ']]', '----------', ...m, ''].join('\n');
        }).filter(Boolean).join('\n');
    }

    function mv(before, after) {
        return storeKeys().forEach(k => {
            const v = storeGet(k);
            storeSet(k, v.replaceAll('[[' + before + ']]', '[[' + after + ']]'))
        })
    }

    function link(textarea) {
        const text = textarea.value;
        const pos = textarea.selectionStart;
        let start, end;

        for (start = pos - 1; start > -1 && /[^\s\(\)]/.test(text[start]); start--) {
        }

        for (end = pos; end < text.length && /[^\s\(\)]/.test(text[end]); end++) {
        }

        return text.substring(start + 1, end);
    }

    function insert(textarea, text) {
        const start = textarea.selectionStart;
        const end = textarea.selectionEnd;
        const before = textarea.value.substring(0, start);
        const after = textarea.value.substring(end, textarea.value.length);

        textarea.value = before + text + after;
        textarea.selectionStart = textarea.selectionEnd = start + text.length;
    }

    const write = text => document.execCommand('insertText', false, text);

    const history = {};

    function hist() {
        return history[$panel().dataset['id']];
    }

    function hpush(h, name) {
        if (h[h.length - 1] === name) return;
        h.push(name);
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Menu

    function menuNew() {
        createPane();
    }

    function menuLs() {
        $name() || createPane();
        load('+ls');
    }

    function menuReset() {
        if (confirm('delete everything?')) {
            storeClear();
        }
    }

    function menuRun() {
        runPane($content().value);
    }

    function menuMv() {
        let prev = $panel().dataset['name'];
        if (prev === $name().value) return;
        mv(prev, $name().value);
        save();
        storeDel(prev);
        $prevPanel = $panel();
        $$('section').forEach($pane => {
            setActive($pane);
            load($name().value, false);
        })
        setActive($prevPanel);
        refresh();
    }

    function quine() {
        const regex = /let store = (.*)/;
        return ['<!DOCTYPE html>',
            `<head>${document.head.innerHTML}</head>`,
            '<body>',
            '<div id="app"></div>',
            `<script>${$('script').innerHTML.replace(regex, "let store = " + JSON.stringify(store)
                .replaceAll('</' + 'script', "' + '</' + 'script' + '") + ';') + '</'}script>`,
            '</body>'].join('\n');
    }

    function menuSave() {
        $('#app').classList.remove('dirty');
        download(quine(), basename(window.location.href) + '.html', 'text/html');
    }

    function menuExport() {
        download(JSON.stringify(store), basename(window.location.href) + '.json', 'text/json');
    }

    function menuDel() {
        let name = $name().value;
        if (name && confirm('delete ' + name + '?')) {
            storeDel(name);
            refresh();
            deletePane($panel());
        }
    }

    function menuSettings() {
        $('#settings').classList.toggle('visible');
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Pane actions

    function paneFold(e) {
        closest$(e, 'section').classList.toggle('folded');
    }

    function paneMax(e) {
        if (closest$(e, 'section').classList.contains('maxed')) {
            closest$(e, 'section').classList.remove('maxed');
            closest$(e, '.column').classList.remove('folded');
        } else {
            closest$(e, '.column').querySelectorAll('section').forEach(e => e.classList.remove("maxed"));
            closest$(e, 'section').classList.add("maxed");
            closest$(e, '.column').classList.add('folded');
        }
    }

    function paneMove(e) {
        let $c;
        $$('.column').forEach(c => {
            if (c !== closest$(e, '.column')) $c = c;
        });
        $c.appendChild(closest$(e, 'section'));
    }

    function paneClose(e) {
        deletePane(closest$(e, 'section'));
        if ($('section')) {
            setActive($('section'));
            $content().focus;
        }
    }

    function paneHist(from, to) {
        return function (e) {
            if (!from.length) return;
            let name = from.pop();
            if (isChordNavBlank(e)) {
                from.push(name);
                createPane();
            } else if (isChordNav(e)) {
                from.push(name);
                setActive($prevPanel);
                load(name);
                $content().focus();
            } else {
                hpush(to, $panel().dataset['name']);
            }
            load(name, true);
        }
    }

    function findOrCreatePane(name) {
        let p;
        $$('section').forEach(e => e.querySelector('.name').value === name && (p = e));
        if (!p) {
            p = createPane();
        }
        setActive(p);
        load(name);
        return p;
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Scheme interpreter

    const global = {};
    const arity = (fn, n) => (s, env) => {
        if (collect(cdr(s)).length !== n) throw new Error(`${asString(car(s))}: Wrong number of arguments`);
        return fn(s, env);
    }
    const primitive = {
        define: arity((s, env) => {
            return env[cadr(s)] = eval(env, cadr(cdr(s)));
        }, 2),
        quote: arity((s, env) => cadr(s), 1),
        car: arity((s, env) => {
            let rv = eval(env, cadr(s));
            if (rv === null) throw new Error('You cannot ask for the car of the empty list');
            else if (isAtom(rv)) throw new Error('You cannot ask for the car of an atom');
            return car(rv)
        }, 1),
        cdr: arity((s, env) => {
            let rv = eval(env, cadr(s));
            if (rv === null) throw new Error('You cannot ask for the cdr of the empty list');
            if (isAtom(rv)) throw new Error('You cannot ask for the cdr of an atom');
            return cdr(rv)
        }, 1),
        cons: arity((s, env) => {
            let r = eval(env, cadr(cdr(s)));
            if (!isList(r)) throw new Error('Second argument of cons must be a list');
            return cons(eval(env, cadr(s)), r);
        }, 2),
        'null?': arity((s, env) => {
            let r = eval(env, cadr(s));
            if (!isList(r)) throw new Error('null? is defined only for lists');
            return r === null;
        }, 1),
        'zero?': arity((s, env) => {
            let r = eval(env, cadr(s));
            if (!isAtom(r)) throw new Error('zero? is defined only for atoms');
            return r === 0;
        }, 1),
        'atom?': arity((s, env) => {
            return isAtom(eval(env, cadr(s)));
        }, 1),
        'number?': arity((s, env) => {
            return isNumber(eval(env, cadr(s)));
        }, 1),
        'eq?': arity((s, env) => {
            let l = eval(env, cadr(s));
            let r = eval(env, cadr(cdr(s)));
            if (!isAtom(l) || isNumber(l) || !isAtom(r) || isNumber(r)) throw new Error('eq? takes two non-numeric atoms');
            return l === r;
        }, 2),
        or: arity((s, env) => {
            return eval(env, cadr(s)) || eval(env, cadr(cdr(s)));
        }, 2),
        and: arity((s, env) => {
            return eval(env, cadr(s)) && eval(env, cadr(cdr(s)));
        }, 2),
        add1: arity((s, env) => eval(env, cadr(s)) + 1, 1),
        sub1: arity((s, env) => eval(env, cadr(s)) - 1, 1),
        lambda: arity((s, env) => {
            return {
                args: collect(cadr(s)), body: cadr(cdr(s)),
                env: Object.fromEntries(Object.entries(env))
            }
        }, 2),
        letrec: arity((s, env) => {
            let f = eval(env, car(cdr(car(cadr(s)))));
            f.env[car(car(car(cdr(s))))] = f;
            return eval(f.env, car(cdr(cdr(s))));
        }, 2),
        cond: (s, env) => {
            let b = collect(cdr(s));
            for (let i = 0; i < b.length; i++) {
                if (car(b[i]) === 'else' || eval(env, car(b[i])))
                    return eval(env, cadr(b[i]));
            }
        }
    }
    const cons = (car, cdr) => [car, cdr];
    const car = c => c[0];
    const cdr = c => c[1];
    const cadr = c => car(cdr(c));
    const isAtom = s => s !== null && !Array.isArray(s);
    const isList = s => Array.isArray(s) || s === null;
    const isNumber = s => typeof s === 'number';
    const parse = src => ast(src.replaceAll('(', ' ( ').replaceAll(')', ' ) ').replaceAll(/;.*$/gm, '').split(/\s/).filter(Boolean));
    const exec = src => eval(global, parse(src), true);

    function ast(tokens, d = {depth: 0}) {
        if (!tokens.length) {
            if (d.depth > 0) throw new Error('Unexpected EOF!');
            else return null;
        }
        let t = tokens.shift();
        if (t === ')') {
            if (d.depth-- === 0) throw new Error('Unexpected closing parenthesis');
            return null;
        } else if (t === '(') {
            d.depth++;
            return cons(ast(tokens, d), ast(tokens, d));
        } else if (t[0] === '#') {
            if (tokens.length) return cons(t[1] === 't', ast(tokens, d));
            return t[1] === 't';
        } else if (isNaN(t)) {
            if (tokens.length) return cons(t, ast(tokens, d));
            return t;
        }
        if (tokens.length) return cons(+t, ast(tokens, d));
        return +t;
    }

    function collect(s) {
        if (!s) return [];
        return [car(s), ...collect(cdr(s))];
    }

    function eval(env, s, isSrc) {
        if (s === null) throw new Error('Evaluating empty list');
        if (isAtom(s)) {
            if (isNaN(s)) {
                if (env[s] !== undefined) return env[s];
                else if (Object.keys(primitive).includes(s)) return s;
                throw new Error('Undefined variable ' + s);
            }
            return s;
        } else if (isSrc) {
            let rv = eval(env, car(s));
            if (cdr(s)) return eval(env, cdr(s), isSrc);
            return rv;
        }
        let proc = eval(env, car(s));
        if (Object.keys(primitive).includes(proc || car(s))) {
            return primitive[proc || car(s)](s, env)
        }
        try {
            let args = {};
            collect(cdr(s)).forEach((a, i) => {
                args[proc.args[i]] = eval(env, a);
            });
            return arity((_, env) => eval(env, proc.body), proc.args.length)(s, Object.assign({}, env, proc.env, args));
        } catch (e) {
            throw new Error(`${asString(car(s))}: ${e}`);
        }
    }

    function asString(s) {
        function build(s, acc = [], nl = true) {
            if (s === null) {
                acc.push('()');
                return acc;
            } else if (s.body) {
                acc.push('<proc (' + s.args.join(' ') + ')>');
                return acc;
            } else if (isAtom(s)) {
                acc.push(s);
                return acc;
            } else {
                nl && acc.push('(');
                build(s[0], acc, true);
                s[1] && build(s[1], acc, false);
                nl && acc.push(')');
            }
            return acc;
        }

        return build(s).join(' ').replaceAll('( ', '(').replaceAll(' )', ')');
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Listeners

    let $prevPanel;
    let $resize;
    let $hresize;

    function handleSearch(e) {
        e.preventDefault();
        e.stopPropagation();
        if (isChordNavBlank(e)) {
            navBlank(t$(e).value);
            closeSearch();
        } else if (isChordNav(e)) {
            if (!$content()) createPane();
            closeSearch();
            load(t$(e).value);
        } else {
            if (!$content()) return;
            closeSearch();
            if (!isStoreKey(t$(e).value)) {
                storeSet(t$(e).value, '');
                refresh();
            }
            write(t$(e).value);
        }
    }

    document.getElementById('app').innerHTML = `
 <datalist id="files"></datalist>
 <datalist id="globals"></datalist>
<table>
    <tr>
        <td colspan="2" class="menu" style="height: 0;">
            <span class="new">new</span><span class="ls">ls</span><span class="mv">mv</span><span class="del">del</span><span class="save">save</span><span class="run">run</span><span class="settings">import</span><span class="export">export</span><span class="reset">reset</span>
        </td>
    </tr>
    <tr id="settings">
        <td colspan="2" class="menu" style="height: 0;">
            <input type="file" id="import" value="">
        </td>
    </tr>
    <tr>
        <td class="col">
            <div class="active column"></div>
            <div class="resize"></div>
        </td>
        <td>
            <div class="column"></div>
        </td>
    </tr>
</table>
<input list="files" spellcheck="false" id="search" autocomplete="off"/>
    `;

    document.addEventListener('mousedown', function (e) {
        if (hasCls(t$(e), 'resize')) {
            e.preventDefault();
            $resize = closest$(e, 'td');
        } else if (hasCls(t$(e), 'h-resize')) {
            e.preventDefault();
            $hresize = closest$(e, 'section').querySelector('article');
        }
        $prevPanel = $panel() || $prevPanel;
        let section = closest$(e, 'section');
        section && setActive(section);
        let column = closest$(e, '.column');
        if (column && (!e.altKey && !e.metaKey && !e.ctrlKey)) {
            togCls('active', '.column', column);
        }
    });

    document.addEventListener('mousemove', function (e) {
        if ($resize) $resize.width = e.clientX;
        else if ($hresize) {
            const $sib = $hresize.closest('section').nextSibling;
            const rect = $hresize.getBoundingClientRect();
            let h = e.y - rect.top < 0 ? 0 : e.y - rect.top;
            let diff = h - rect.height;
            if ($sib && $sib.nextSibling) {
                const $sArt = $sib.querySelector('article');
                const sRect = $sArt.getBoundingClientRect();
                if (sRect.height - diff <= 0) {
                    $hresize.style.height = `${+$hresize.style.height.split('px')[0] + sRect.height}px`;
                    $sArt.style.height = `0px`;
                    return;
                }
                $sArt.style.height = `${sRect.height - diff}px`;
            }
            $hresize.style.height = `${h}px`;
        }
    })

    document.addEventListener('mouseup', () => {
        $resize = null;
        $hresize = null;
    });

    document.addEventListener('click', function (e) {
        // @formatter:off
        switch (t$(e).classList[0]) {
            case 'new': menuNew(); return;
            case 'ls': menuLs(); return;
            case 'reset': menuReset(); return;
            case 'save': menuSave(); return;
            case 'mv': menuMv(); return;
            case 'del': menuDel(); return;
            case 'settings': menuSettings(); return;
            case 'run': menuRun(); return;
            case 'export': menuExport(); return;
            case 'close': paneClose(e); return;
            case 'max': paneMax(e); return;
            case 'move': paneMove(e); return;
            case 'back': paneHist(hist().back, hist().forward)(e); return;
            case 'forward': paneHist(hist().forward, hist().back)(e); return;
        }
        // @formatter:on
        if (isChordNavBlank(e) && e.button === 0) {
            link($content()) && navBlank(link($content()));
        } else if (isChordNav(e) && e.button === 0) {
            let name = link($content());
            if (name) {
                setActive($prevPanel);
                load(name);
                $content().focus();
            }
        }
    });

    window.addEventListener('beforeunload', e => {
        if ($('.dirty')) {
            e.preventDefault();
            e.returnValue = true;
        }
    })

    function offset(text) {
        const stack = [];
        let o = 0;
        text.split('').forEach((c, i) => {
            if (c === '(') stack.push({spaces: i - o, total: i});
            else if (c === ')') stack.pop();
            else if (c === '\n') o = i + 1;
        });
        return stack.pop() || 0;
    }

    const move = (e, pos) => e.setSelectionRange(pos, pos);
    const caret = e => e.value.substring(0, e.selectionStart);
    let last;

    document.addEventListener('keydown', function (e) {
        if (e.key === 'Enter') {
            if (t$(e).id === 'search') {
                handleSearch(e);
            } else if (isChordNav(e)) {
                $search().value = '';
                $search().classList.add('searching');
                $search().focus();
            } else if (hasCls(e.target, 'name')) {
                load($name().value);
            } else {
                e.preventDefault();
                let s = offset(caret(t$(e)));
                if (s.spaces === undefined) write('\n')
                else write('\n' + Array(s.spaces + 3).join(' '));
            }
        } else if (e.key === 'Escape' && e.target.id === 'search') {
            $search().classList.remove('searching');
            $content().focus();
        } else if (t$(e).classList[0] === 'content') {
            const textarea = t$(e);
            if (e.key === '(') {
                e.preventDefault();
                write('()');
                move(textarea, textarea.selectionStart - 1);
            }
            if (e.key === '\'') {
                e.preventDefault();
                write('(quote )');
                move(textarea, textarea.selectionStart - 1);
            } else if (e.key === 'Tab') {
                e.preventDefault();
                let c = caret(textarea);
                if (c[c.length - 1] === '(') {
                    return move(textarea, last);
                }
                let o = offset(c);
                if (o.spaces === undefined) return;
                last = c.length;
                move(textarea, o.total + 1);
            } else if (e.key === 'r' && (e.metaKey || e.ctrlKey)) {
                runPane(textarea.value);
            }
        }
    });

    document.getElementById('import').addEventListener('change', function (e) {
        const file = e.target.files[0];
        const r = new FileReader();
        r.onload = e => {
            let data = JSON.parse('' + e.target.result);
            Object.keys(data).forEach(k => storeSet(k, data[k]));
            refresh();
        }
        r.readAsText(file);
        refresh();
    });

    document.addEventListener('keyup', function (e) {
        if (t$(e).className === 'content') {
            let $parse = closest$(e, 'section').querySelector('.parse');
            try {
                parse($content().value);
                $parse.innerHTML = '';
            } catch (e) {
                $parse.innerHTML = e;
            }
        }
    })

    refresh();
    createPane();
    load((location.hash && location.hash.substring(1)) || 'main');
</script>
</body>
</html>