Switch to Hugo

This commit includes all the needed workarounds and most changes from the main branch for everything to work, like:

* removing empty lines in raw HTML that break output
* read .browserslistrc, CSS variables from disk instead of duplicating it
* using Hugo mounts
* using Hugo for the docs CSS/JS
* move ToC Sass code to a separate file while adapting it for Hugo

Thus, this patch makes our npm scripts faster since lint runs on one step and there's no separate docs assets processing.

site/assets/js/application.js

@@ -0,0 +1,112 @@
+// NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT
+// IT'S ALL JUST JUNK FOR OUR DOCS!
+// ++++++++++++++++++++++++++++++++++++++++++
+
+/*!
+ * JavaScript for Bootstrap's docs (https://getbootstrap.com/)
+ * Copyright 2011-2020 The Bootstrap Authors
+ * Copyright 2011-2020 Twitter, Inc.
+ * Licensed under the Creative Commons Attribution 3.0 Unported License.
+ * For details, see https://creativecommons.org/licenses/by/3.0/.
+ */
+
+/* global ClipboardJS: false, anchors: false, bsCustomFileInput: false */
+
+(function ($) {
+  'use strict'
+
+  $(function () {
+    // Tooltip and popover demos
+    $('.tooltip-demo').tooltip({
+      selector: '[data-toggle="tooltip"]',
+      container: 'body'
+    })
+
+    $('[data-toggle="popover"]').popover()
+
+    $('.toast')
+      .toast({
+        autohide: false
+      })
+      .toast('show')
+
+    // Demos within modals
+    $('.tooltip-test').tooltip()
+    $('.popover-test').popover()
+
+    // Indeterminate checkbox example
+    $('.bd-example-indeterminate [type="checkbox"]').prop('indeterminate', true)
+
+    // Disable empty links in docs examples
+    $('.bd-content [href="#"]').click(function (e) {
+      e.preventDefault()
+    })
+
+    // Modal relatedTarget demo
+    $('#exampleModal').on('show.bs.modal', function (event) {
+      var $button = $(event.relatedTarget) // Button that triggered the modal
+      var recipient = $button.data('whatever') // Extract info from data-* attributes
+      // If necessary, you could initiate an AJAX request here (and then do the updating in a callback).
+      // Update the modal's content. We'll use jQuery here, but you could use a data binding library or other methods instead.
+      var $modal = $(this)
+      $modal.find('.modal-title').text('New message to ' + recipient)
+      $modal.find('.modal-body input').val(recipient)
+    })
+
+    // Activate animated progress bar
+    $('.bd-toggle-animated-progress').on('click', function () {
+      $(this).siblings('.progress').find('.progress-bar-striped').toggleClass('progress-bar-animated')
+    })
+
+    // Insert copy to clipboard button before .highlight
+    $('div.highlight').each(function () {
+      var btnHtml = '<div class="bd-clipboard"><button type="button" class="btn-clipboard" title="Copy to clipboard">Copy</button></div>'
+      $(this).before(btnHtml)
+      $('.btn-clipboard')
+        .tooltip()
+        .on('mouseleave', function () {
+          // Explicitly hide tooltip, since after clicking it remains
+          // focused (as it's a button), so tooltip would otherwise
+          // remain visible until focus is moved away
+          $(this).tooltip('hide')
+        })
+    })
+
+    var clipboard = new ClipboardJS('.btn-clipboard', {
+      target: function (trigger) {
+        return trigger.parentNode.nextElementSibling
+      }
+    })
+
+    clipboard.on('success', function (e) {
+      $(e.trigger)
+        .attr('title', 'Copied!')
+        .tooltip('_fixTitle')
+        .tooltip('show')
+        .attr('title', 'Copy to clipboard')
+        .tooltip('_fixTitle')
+
+      e.clearSelection()
+    })
+
+    clipboard.on('error', function (e) {
+      var modifierKey = /mac/i.test(navigator.userAgent) ? '\u2318' : 'Ctrl-'
+      var fallbackMsg = 'Press ' + modifierKey + 'C to copy'
+
+      $(e.trigger)
+        .attr('title', fallbackMsg)
+        .tooltip('_fixTitle')
+        .tooltip('show')
+        .attr('title', 'Copy to clipboard')
+        .tooltip('_fixTitle')
+    })
+
+    anchors.options = {
+      icon: '#'
+    }
+    anchors.add('.bd-content > h2, .bd-content > h3, .bd-content > h4, .bd-content > h5')
+    $('.bd-content').children('h2, h3, h4, h5').wrapInner('<span class="bd-content-title"></span>')
+
+    bsCustomFileInput.init()
+  })
+})(jQuery)

site/assets/js/ie-emulation-modes-warning.js

@@ -0,0 +1,52 @@
+// NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT
+// IT'S ALL JUST JUNK FOR OUR DOCS!
+// ++++++++++++++++++++++++++++++++++++++++++
+
+// Intended to prevent false-positive bug reports about Bootstrap not working properly in old versions of IE due to folks testing using IE's unreliable emulation modes.
+(function () {
+  'use strict'
+
+  function emulatedIEMajorVersion() {
+    var groups = /MSIE ([\d.]+)/.exec(window.navigator.userAgent)
+    if (groups === null) {
+      return null
+    }
+
+    var ieVersionNum = parseInt(groups[1], 10)
+    var ieMajorVersion = Math.floor(ieVersionNum)
+    return ieMajorVersion
+  }
+
+  function actualNonEmulatedIEMajorVersion() {
+    // Detects the actual version of IE in use, even if it's in an older-IE emulation mode.
+    // IE JavaScript conditional compilation docs: https://msdn.microsoft.com/library/121hztk3%28v=vs.94%29.aspx
+    // @cc_on docs: https://msdn.microsoft.com/library/8ka90k2e%28v=vs.94%29.aspx
+    var jscriptVersion = new Function('/*@cc_on return @_jscript_version; @*/')() // eslint-disable-line no-new-func
+    if (typeof jscriptVersion === 'undefined') {
+      return 11 // IE11+ not in emulation mode
+    }
+
+    if (jscriptVersion < 9) {
+      return 8 // IE8 (or lower; haven't tested on IE<8)
+    }
+
+    return jscriptVersion // IE9 or IE10 in any mode, or IE11 in non-IE11 mode
+  }
+
+  var ua = window.navigator.userAgent
+  if (ua.indexOf('Opera') > -1 || ua.indexOf('Presto') > -1) {
+    return // Opera, which might pretend to be IE
+  }
+
+  var emulated = emulatedIEMajorVersion()
+  if (emulated === null) {
+    return // Not IE
+  }
+
+  var nonEmulated = actualNonEmulatedIEMajorVersion()
+
+  if (emulated !== nonEmulated) {
+    // eslint-disable-next-line no-alert
+    window.alert('WARNING: You appear to be using IE' + nonEmulated + ' in IE' + emulated + ' emulation mode.\nIE emulation modes can behave significantly differently from ACTUAL older versions of IE.\nPLEASE DON\'T FILE BOOTSTRAP BUGS based on testing in IE emulation modes!')
+  }
+})()

site/assets/js/search.js

@@ -0,0 +1,60 @@
+// NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT
+// IT'S ALL JUST JUNK FOR OUR DOCS!
+// ++++++++++++++++++++++++++++++++++++++++++
+
+(function () {
+  'use strict'
+
+  var inputElement = document.getElementById('search-input')
+
+  if (!window.docsearch || !inputElement) {
+    return
+  }
+
+  var siteDocsVersion = inputElement.getAttribute('data-docs-version')
+
+  function getOrigin() {
+    var location = window.location
+    var origin = location.origin
+
+    if (!origin) {
+      var port = location.port ? ':' + location.port : ''
+
+      origin = location.protocol + '//' + location.hostname + port
+    }
+
+    return origin
+  }
+
+  window.docsearch({
+    apiKey: '5990ad008512000bba2cf951ccf0332f',
+    indexName: 'bootstrap',
+    inputSelector: '#search-input',
+    algoliaOptions: {
+      facetFilters: ['version:' + siteDocsVersion]
+    },
+    transformData: function (hits) {
+      return hits.map(function (hit) {
+        var currentUrl = getOrigin()
+        var liveUrl = 'https://getbootstrap.com/'
+
+        hit.url = currentUrl.lastIndexOf(liveUrl, 0) === 0 ?
+          // On production, return the result as is
+          hit.url :
+          // On development or Netlify, replace `hit.url` with a trailing slash,
+          // so that the result link is relative to the server root
+          hit.url.replace(liveUrl, '/')
+
+        // Prevent jumping to first header
+        if (hit.anchor === 'content') {
+          hit.url = hit.url.replace(/#content$/, '')
+          hit.anchor = null
+        }
+
+        return hit
+      })
+    },
+    // Set debug to `true` if you want to inspect the dropdown
+    debug: false
+  })
+})()

site/assets/js/vendor/bs-custom-file-input.min.js

@@ -0,0 +1,7 @@
+/*!
+ * bsCustomFileInput v1.3.4 (https://github.com/Johann-S/bs-custom-file-input)
+ * Copyright 2018 - 2020 Johann-S <johann.servoire@gmail.com>
+ * Licensed under MIT (https://github.com/Johann-S/bs-custom-file-input/blob/master/LICENSE)
+ */
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).bsCustomFileInput=t()}(this,function(){"use strict";var s={CUSTOMFILE:'.custom-file input[type="file"]',CUSTOMFILELABEL:".custom-file-label",FORM:"form",INPUT:"input"},l=function(e){if(0<e.childNodes.length)for(var t=[].slice.call(e.childNodes),n=0;n<t.length;n++){var l=t[n];if(3!==l.nodeType)return l}return e},u=function(e){var t=e.bsCustomFileInput.defaultText,n=e.parentNode.querySelector(s.CUSTOMFILELABEL);n&&(l(n).textContent=t)},n=!!window.File,r=function(e){if(e.hasAttribute("multiple")&&n)return[].slice.call(e.files).map(function(e){return e.name}).join(", ");if(-1===e.value.indexOf("fakepath"))return e.value;var t=e.value.split("\\");return t[t.length-1]};function d(){var e=this.parentNode.querySelector(s.CUSTOMFILELABEL);if(e){var t=l(e),n=r(this);n.length?t.textContent=n:u(this)}}function v(){for(var e=[].slice.call(this.querySelectorAll(s.INPUT)).filter(function(e){return!!e.bsCustomFileInput}),t=0,n=e.length;t<n;t++)u(e[t])}var p="bsCustomFileInput",m="reset",h="change";return{init:function(e,t){void 0===e&&(e=s.CUSTOMFILE),void 0===t&&(t=s.FORM);for(var n,l,r=[].slice.call(document.querySelectorAll(e)),i=[].slice.call(document.querySelectorAll(t)),o=0,u=r.length;o<u;o++){var c=r[o];Object.defineProperty(c,p,{value:{defaultText:(n=void 0,n="",(l=c.parentNode.querySelector(s.CUSTOMFILELABEL))&&(n=l.textContent),n)},writable:!0}),d.call(c),c.addEventListener(h,d)}for(var f=0,a=i.length;f<a;f++)i[f].addEventListener(m,v),Object.defineProperty(i[f],p,{value:!0,writable:!0})},destroy:function(){for(var e=[].slice.call(document.querySelectorAll(s.FORM)).filter(function(e){return!!e.bsCustomFileInput}),t=[].slice.call(document.querySelectorAll(s.INPUT)).filter(function(e){return!!e.bsCustomFileInput}),n=0,l=t.length;n<l;n++){var r=t[n];u(r),r[p]=void 0,r.removeEventListener(h,d)}for(var i=0,o=e.length;i<o;i++)e[i].removeEventListener(m,v),e[i][p]=void 0}}});
+//# sourceMappingURL=bs-custom-file-input.min.js.map