copy_as_gfm_spec.rb

require 'spec_helper'

describe 'Copy as GFM', feature: true, js: true do
  include GitlabMarkdownHelper
  include ActionView::Helpers::JavaScriptHelper

  before do
    @feat = MarkdownFeature.new

    # `markdown` helper expects a `@project` variable
    @project = @feat.project

    visit namespace_project_issue_path(@project.namespace, @project, @feat.issue)
  end

  # The filters referenced in lib/banzai/pipeline/gfm_pipeline.rb convert GitLab Flavored Markdown (GFM) to HTML.
  # The handlers defined in app/assets/javascripts/copy_as_gfm.js.es6 consequently convert that same HTML to GFM.
  # To make sure these filters and handlers are properly aligned, this spec tests the GFM-to-HTML-to-GFM cycle
  # by verifying (`html_to_gfm(gfm_to_html(gfm)) == gfm`) for a number of examples of GFM for every filter, using the `verify` helper.

  # These are all in a single `it` for performance reasons.
  it 'works', :aggregate_failures do
    verify(
      'nesting',

      '> 1. [x] **[$`2 + 2`$ {-=-}{+=+} 2^2 ~~:thumbsup:~~](http://google.com)**'
    )

    verify(
      'a real world example from the gitlab-ce README',

      <<-GFM.strip_heredoc
        # GitLab

        [![Build status](https://gitlab.com/gitlab-org/gitlab-ce/badges/master/build.svg)](https://gitlab.com/gitlab-org/gitlab-ce/commits/master)
        [![CE coverage report](https://gitlab.com/gitlab-org/gitlab-ce/badges/master/coverage.svg?job=coverage)](https://gitlab-org.gitlab.io/gitlab-ce/coverage-ruby)
        [![Code Climate](https://codeclimate.com/github/gitlabhq/gitlabhq.svg)](https://codeclimate.com/github/gitlabhq/gitlabhq)
        [![Core Infrastructure Initiative Best Practices](https://bestpractices.coreinfrastructure.org/projects/42/badge)](https://bestpractices.coreinfrastructure.org/projects/42)

        ## Canonical source

        The canonical source of GitLab Community Edition is [hosted on GitLab.com](https://gitlab.com/gitlab-org/gitlab-ce/).

        ## Open source software to collaborate on code

        To see how GitLab looks please see the [features page on our website](https://about.gitlab.com/features/).


        - Manage Git repositories with fine grained access controls that keep your code secure

        - Perform code reviews and enhance collaboration with merge requests

        - Complete continuous integration (CI) and CD pipelines to builds, test, and deploy your applications

        - Each project can also have an issue tracker, issue board, and a wiki

        - Used by more than 100,000 organizations, GitLab is the most popular solution to manage Git repositories on-premises

        - Completely free and open source (MIT Expat license)
      GFM
    )

    verify(
      'InlineDiffFilter',

      '{-Deleted text-}',
      '{+Added text+}'
    )

    verify(
      'TaskListFilter',

      '- [ ] Unchecked task',
      '- [x] Checked task',
      '1. [ ] Unchecked numbered task',
      '1. [x] Checked numbered task'
    )

    verify(
      'ReferenceFilter',

      # issue reference
      @feat.issue.to_reference,
      # full issue reference
      @feat.issue.to_reference(full: true),
      # issue URL
      namespace_project_issue_url(@project.namespace, @project, @feat.issue),
      # issue URL with note anchor
      namespace_project_issue_url(@project.namespace, @project, @feat.issue, anchor: 'note_123'),
      # issue link
      "[Issue](#{namespace_project_issue_url(@project.namespace, @project, @feat.issue)})",
      # issue link with note anchor
      "[Issue](#{namespace_project_issue_url(@project.namespace, @project, @feat.issue, anchor: 'note_123')})",
    )

    verify(
      'AutolinkFilter',

      'https://example.com'
    )

    verify(
      'TableOfContentsFilter',

      '[[_TOC_]]'
    )

    verify(
      'EmojiFilter',

      ':thumbsup:'
    )

    verify(
      'ImageLinkFilter',

      '![Image](https://example.com/image.png)'
    )

    verify(
      'VideoLinkFilter',

      '![Video](https://example.com/video.mp4)'
    )

    verify(
      'MathFilter: math as converted from GFM to HTML',

      '$`c = \pm\sqrt{a^2 + b^2}`$',

      # math block
      <<-GFM.strip_heredoc
        ```math
        c = \pm\sqrt{a^2 + b^2}
        ```
      GFM
    )

    aggregate_failures('MathFilter: math as transformed from HTML to KaTeX') do
      gfm = '$`c = \pm\sqrt{a^2 + b^2}`$'

      html = <<-HTML.strip_heredoc
        <span class="katex">
          <span class="katex-mathml">
            <math>
              <semantics>
                <mrow>
                  <mi>c</mi>
                  <mo>=</mo>
                  <mo>±</mo>
                  <msqrt>
                    <mrow>
                      <msup>
                        <mi>a</mi>
                        <mn>2</mn>
                      </msup>
                      <mo>+</mo>
                      <msup>
                        <mi>b</mi>
                        <mn>2</mn>
                      </msup>
                    </mrow>
                  </msqrt>
                </mrow>
                <annotation encoding="application/x-tex">c = \\pm\\sqrt{a^2 + b^2}</annotation>
              </semantics>
            </math>
          </span>
          <span class="katex-html" aria-hidden="true">
              <span class="strut" style="height: 0.913389em;"></span>
              <span class="strut bottom" style="height: 1.04em; vertical-align: -0.126611em;"></span>
              <span class="base textstyle uncramped">
                <span class="mord mathit">c</span>
                <span class="mrel">=</span>
                <span class="mord">±</span>
                <span class="sqrt mord"><span class="sqrt-sign" style="top: -0.073389em;">
                  <span class="style-wrap reset-textstyle textstyle uncramped">√</span>
                </span>
                <span class="vlist">
                  <span class="" style="top: 0em;">
                    <span class="fontsize-ensurer reset-size5 size5">
                      <span class="" style="font-size: 1em;">​</span>
                    </span>
                    <span class="mord textstyle cramped">
                      <span class="mord">
                        <span class="mord mathit">a</span>
                        <span class="msupsub">
                          <span class="vlist">
                            <span class="" style="top: -0.289em; margin-right: 0.05em;">
                              <span class="fontsize-ensurer reset-size5 size5">
                                <span class="" style="font-size: 0em;">​</span>
                              </span>
                              <span class="reset-textstyle scriptstyle cramped">
                                <span class="mord mathrm">2</span>
                              </span>
                            </span>
                            <span class="baseline-fix">
                              <span class="fontsize-ensurer reset-size5 size5">
                                <span class="" style="font-size: 0em;">​</span>
                              </span>
                            ​</span>
                          </span>
                        </span>
                      </span>
                      <span class="mbin">+</span>
                      <span class="mord">
                        <span class="mord mathit">b</span>
                        <span class="msupsub">
                          <span class="vlist">
                            <span class="" style="top: -0.289em; margin-right: 0.05em;">
                              <span class="fontsize-ensurer reset-size5 size5">
                                <span class="" style="font-size: 0em;">​</span>
                              </span>
                              <span class="reset-textstyle scriptstyle cramped">
                                <span class="mord mathrm">2</span>
                              </span>
                            </span>
                            <span class="baseline-fix">
                              <span class="fontsize-ensurer reset-size5 size5">
                                <span class="" style="font-size: 0em;">​</span>
                              </span>
                            ​</span>
                          </span>
                        </span>
                      </span>
                    </span>
                  </span>
                  <span class="" style="top: -0.833389em;">
                    <span class="fontsize-ensurer reset-size5 size5">
                      <span class="" style="font-size: 1em;">​</span>
                    </span>
                    <span class="reset-textstyle textstyle uncramped sqrt-line"></span>
                  </span>
                  <span class="baseline-fix">
                    <span class="fontsize-ensurer reset-size5 size5">
                      <span class="" style="font-size: 1em;">​</span>
                    </span>
                  ​</span>
                </span>
              </span>
            </span>
          </span>
        </span>
      HTML

      output_gfm = html_to_gfm(html)
      expect(output_gfm.strip).to eq(gfm.strip)
    end

    verify(
      'SanitizationFilter',

      <<-GFM.strip_heredoc
      <a name="named-anchor"></a>

      <sub>sub</sub>

      <dl>
        <dt>dt</dt>
        <dd>dd</dd>
      </dl>

      <kbd>kbd</kbd>

      <q>q</q>

      <samp>samp</samp>

      <var>var</var>

      <ruby>ruby</ruby>

      <rt>rt</rt>

      <rp>rp</rp>

      <abbr>abbr</abbr>
      GFM
    )

    verify(
      'SanitizationFilter',

      <<-GFM.strip_heredoc,
        ```
        Plain text
        ```
      GFM

      <<-GFM.strip_heredoc,
        ```ruby
        def foo
          bar
        end
        ```
      GFM

      <<-GFM.strip_heredoc
        Foo

            This is an example of GFM

            ```js
            Code goes here
            ```
      GFM
    )

    verify(
      'MarkdownFilter',

      "Line with two spaces at the end  \nto insert a linebreak",

      '`code`',
      '`` code with ` ticks ``',

      '> Quote',

      # multiline quote
      <<-GFM.strip_heredoc,
        > Multiline
        > Quote
        >
        > With multiple paragraphs
      GFM

      '![Image](https://example.com/image.png)',

      '# Heading with no anchor link',

      '[Link](https://example.com)',

      '- List item',

      # multiline list item
      <<-GFM.strip_heredoc,
        - Multiline
            List item
      GFM

      # nested lists
      <<-GFM.strip_heredoc,
        - Nested


            - Lists
      GFM

      # list with blockquote
      <<-GFM.strip_heredoc,
        - List

            > Blockquote
      GFM

      '1. Numbered list item',

      # multiline numbered list item
      <<-GFM.strip_heredoc,
        1. Multiline
            Numbered list item
      GFM

      # nested numbered list
      <<-GFM.strip_heredoc,
        1. Nested


            1. Numbered lists
      GFM

      '# Heading',
      '## Heading',
      '### Heading',
      '#### Heading',
      '##### Heading',
      '###### Heading',

      '**Bold**',

      '_Italics_',

      '~~Strikethrough~~',

      '2^2',

      '-----',

      # table
      <<-GFM.strip_heredoc,
        | Centered | Right | Left |
        |:--------:|------:|------|
        | Foo | Bar | **Baz** |
        | Foo | Bar | **Baz** |
      GFM

      # table with empty heading
      <<-GFM.strip_heredoc,
        |  | x | y |
        |---|---|---|
        | a | 1 | 0 |
        | b | 0 | 1 |
      GFM
    )
  end

  alias_method :gfm_to_html, :markdown

  def html_to_gfm(html)
    js = <<-JS.strip_heredoc
      (function(html) {
        var node = document.createElement('div');
        node.innerHTML = html;
        return window.gl.CopyAsGFM.nodeToGFM(node);
      })("#{escape_javascript(html)}")
    JS
    page.evaluate_script(js)
  end

  def verify(label, *gfms)
    aggregate_failures(label) do
      gfms.each do |gfm|
        html = gfm_to_html(gfm)
        output_gfm = html_to_gfm(html)
        expect(output_gfm.strip).to eq(gfm.strip)
      end
    end
  end

  # Fake a `current_user` helper
  def current_user
    @feat.user
  end
end