https://snowdreams1006.github.io/gitbook/gitbook-plugin-code/plugin.js

1require(['gitbook', 'jQuery'], function(gitbook, $) {
2
3  const TERMINAL_HOOK = '**[terminal]'
4
5  var pluginConfig = {};
6  var timeouts = {};
7
8  function addCopyButton(wrapper) {
9    wrapper.append(
10        $('<i class="fa fa-clone t-copy"></i>')
11            .click(function() {
12              copyCommand($(this));
13            })
14    );
15  }
16
17  function addCopyTextarea() {
18
19    /* Add also the text area that will allow to copy */
20    $('body').append('<textarea id="code-textarea" />');
21  }
22
23  function copyCommand(button) {
24    pre = button.parent();
25    textarea = $('#code-textarea');
26    textarea.val(pre.text());
27    textarea.focus();
28    textarea.select();
29    document.execCommand('copy');
30    pre.focus();
31    updateCopyButton(button);
32  }
33
34  function initializePlugin(config) {
35    pluginConfig = config.code;
36  }
37
38  function format_code_block(block) {
39    /*
40     * Add line numbers for multiline blocks.
41     */
42    code = block.children('code');
43    lines = code.html().split('\n');
44
45    if (lines[lines.length - 1] == '') {
46      lines.splice(-1, 1);
47    }
48
49    if (lines.length > 1) {
50      console.log(lines);
51      lines = lines.map(line => '<span class="code-line">' + line + '</span>');
52      console.log(lines);
53      code.html(lines.join('\n'));
54    }
55
56    // Add wrapper to pre element
57    wrapper = block.wrap('<div class="code-wrapper"></div>');
58
59    if (pluginConfig.copyButtons) {
60      addCopyButton(wrapper);
61    }
62  }
63
64  function updateCopyButton(button) {
65    id = button.attr('data-command');
66    button.removeClass('fa-clone').addClass('fa-check');
67
68    // Clear timeout
69    if (id in timeouts) {
70      clearTimeout(timeouts[id]);
71    }
72    timeouts[id] = window.setTimeout(function() {
73      button.removeClass('fa-check').addClass('fa-clone');
74    }, 1000);
75  }
76
77  gitbook.events.bind('start', function(e, config) {
78    initializePlugin(config);
79
80    if (pluginConfig.copyButtons) {
81      addCopyTextarea();
82    }
83  });
84
85  gitbook.events.bind('page.change', function() {
86    $('pre').each(function() {
87      format_code_block($(this));
88    });
89  });
90
91});