Add task lists to issues and merge requests

app/assets/javascripts/issue.js.coffee

@@ -6,4 +6,28 @@ class Issue
     $(".issue-box .inline-update").on "change", "#issue_assignee_id", ->
       $(this).submit()
 
+    if $("a.btn-close").length
+      $("li.task-list-item input:checkbox").prop("disabled", false)
+
+    $(".task-list-item input:checkbox").on "click", ->
+      is_checked = $(this).prop("checked")
+      if $(this).is(":checked")
+        state_event = "task_check"
+      else
+        state_event = "task_uncheck"
+
+      mr_url = $("form.edit-issue").first().attr("action")
+      mr_num = mr_url.match(/\d+$/)
+      task_num = 0
+      $("li.task-list-item input:checkbox").each( (index, e) =>
+        if e == this
+          task_num = index + 1
+      )
+
+      $.ajax
+        type: "PATCH"
+        url: mr_url
+        data: "issue[state_event]=" + state_event +
+          "&issue[task_num]=" + task_num
+
 @Issue = Issue

app/assets/javascripts/merge_request.js.coffee

@@ -17,6 +17,8 @@ class MergeRequest
 
     disableButtonIfEmptyField '#commit_message', '.accept_merge_request'
 
+    if $("a.close-mr-link").length
+      $("li.task-list-item input:checkbox").prop("disabled", false)
 
   # Local jQuery finder
   $: (selector) ->
@@ -72,6 +74,27 @@ class MergeRequest
       this.$('.remove_source_branch_in_progress').hide()
       this.$('.remove_source_branch_widget.failed').show()
 
+    this.$(".task-list-item input:checkbox").on "click", ->
+      is_checked = $(this).prop("checked")
+      if $(this).is(":checked")
+        state_event = "task_check"
+      else
+        state_event = "task_uncheck"
+
+      mr_url = $("form.edit-merge_request").first().attr("action")
+      mr_num = mr_url.match(/\d+$/)
+      task_num = 0
+      $("li.task-list-item input:checkbox").each( (index, e) =>
+        if e == this
+          task_num = index + 1
+      )
+
+      $.ajax
+        type: "PATCH"
+        url: mr_url
+        data: "merge_request[state_event]=" + state_event +
+          "&merge_request[task_num]=" + task_num
+
   activateTab: (action) ->
     this.$('.merge-request-tabs li').removeClass 'active'
     this.$('.tab-content').hide()

app/assets/stylesheets/generic/common.scss

@@ -356,3 +356,6 @@ table {
   font-size: 42px;
 }
 
+.task-status {
+  margin-left: 10px;
+}

app/assets/stylesheets/generic/lists.scss

@@ -122,3 +122,7 @@ ul.bordered-list {
     }
   }
 }
+
+li.task-list-item {
+  list-style-type: none;
+}

app/controllers/projects/issues_controller.rb

@@ -152,7 +152,7 @@ class Projects::IssuesController < Projects::ApplicationController
   def issue_params
     params.require(:issue).permit(
       :title, :assignee_id, :position, :description,
-      :milestone_id, :state_event, label_ids: []
+      :milestone_id, :state_event, :task_num, label_ids: []
     )
   end
 end

app/controllers/projects/merge_requests_controller.rb

@@ -250,7 +250,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     params.require(:merge_request).permit(
       :title, :assignee_id, :source_project_id, :source_branch,
       :target_project_id, :target_branch, :milestone_id,
-      :state_event, :description, label_ids: []
+      :state_event, :description, :task_num, label_ids: []
     )
   end
 end

app/models/concerns/taskable.rb

+# Contains functionality for objects that can have task lists in their
+# descriptions.  Task list items can be added with Markdown like "* [x] Fix
+# bugs".
+#
+# Used by MergeRequest and Issue
+module Taskable
+  TASK_PATTERN_MD = /^(?<bullet> *[*-] *)\[(?<checked>[ xX])\]/.freeze
+  TASK_PATTERN_HTML = /^<li>\[(?<checked>[ xX])\]/.freeze
+
+  # Change the state of a task list item for this Taskable.  Edit the object's
+  # description by finding the nth task item and changing its checkbox
+  # placeholder to "[x]" if +checked+ is true, or "[ ]" if it's false.
+  # Note: task numbering starts with 1
+  def update_nth_task(n, checked)
+    index = 0
+    check_char = checked ? 'x' : ' '
+
+    # Do this instead of using #gsub! so that ActiveRecord detects that a field
+    # has changed.
+    self.description = self.description.gsub(TASK_PATTERN_MD) do |match|
+      index += 1
+      case index
+      when n then "#{$LAST_MATCH_INFO[:bullet]}[#{check_char}]"
+      else match
+      end
+    end
+
+    save
+  end
+
+  # Return true if this object's description has any task list items.
+  def tasks?
+    description && description.match(TASK_PATTERN_MD)
+  end
+
+  # Return a string that describes the current state of this Taskable's task
+  # list items, e.g. "20 tasks (12 done, 8 unfinished)"
+  def task_status
+    return nil unless description
+
+    num_tasks = 0
+    num_done = 0
+
+    description.scan(TASK_PATTERN_MD) do
+      num_tasks += 1
+      num_done += 1 unless $LAST_MATCH_INFO[:checked] == ' '
+    end
+
+    "#{num_tasks} tasks (#{num_done} done, #{num_tasks - num_done} unfinished)"
+  end
+end

app/models/issue.rb

@@ -23,6 +23,7 @@ require 'file_size_validator'
 class Issue < ActiveRecord::Base
   include Issuable
   include InternalId
+  include Taskable
 
   ActsAsTaggableOn.strict_case_match = true
 

app/models/merge_request.rb

@@ -25,6 +25,7 @@ require Rails.root.join("lib/static_model")
 
 class MergeRequest < ActiveRecord::Base
   include Issuable
+  include Taskable
   include InternalId
 
   belongs_to :target_project, foreign_key: :target_project_id, class_name: "Project"

app/services/issues/update_service.rb

@@ -8,9 +8,14 @@ module Issues
         Issues::ReopenService.new(project, current_user, {}).execute(issue)
       when 'close'
         Issues::CloseService.new(project, current_user, {}).execute(issue)
+      when 'task_check'
+        issue.update_nth_task(params[:task_num].to_i, true)
+      when 'task_uncheck'
+        issue.update_nth_task(params[:task_num].to_i, false)
       end
 
-      if params.present? && issue.update_attributes(params.except(:state_event))
+      if params.present? && issue.update_attributes(params.except(:state_event,
+                                                                  :task_num))
         issue.reset_events_cache
 
         if issue.previous_changes.include?('milestone_id')
@@ -28,5 +33,12 @@ module Issues
 
       issue
     end
+
+    private
+
+    def update_task(issue, params, checked)
+      issue.update_nth_task(params[:task_num].to_i, checked)
+      params.except!(:task_num)
+    end
   end
 end

app/services/merge_requests/update_service.rb

@@ -17,9 +17,15 @@ module MergeRequests
         MergeRequests::ReopenService.new(project, current_user, {}).execute(merge_request)
       when 'close'
         MergeRequests::CloseService.new(project, current_user, {}).execute(merge_request)
+      when 'task_check'
+        merge_request.update_nth_task(params[:task_num].to_i, true)
+      when 'task_uncheck'
+        merge_request.update_nth_task(params[:task_num].to_i, false)
       end
 
-      if params.present? && merge_request.update_attributes(params.except(:state_event))
+      if params.present? && merge_request.update_attributes(
+        params.except(:state_event, :task_num)
+      )
         merge_request.reset_events_cache
 
         if merge_request.previous_changes.include?('milestone_id')

app/views/projects/issues/_issue.html.haml

@@ -26,6 +26,10 @@
       %span
         %i.fa.fa-clock-o
         = issue.milestone.title
+    - if issue.tasks?
+      %span.task-status
+        = issue.task_status
+
     .pull-right
       %small updated #{time_ago_with_tooltip(issue.updated_at, 'bottom', 'issue_update_ago')}
 

app/views/projects/issues/show.html.haml

@@ -48,7 +48,7 @@
     .description
       .wiki
         = preserve do
-          = markdown @issue.description
+          = markdown(@issue.description, parse_tasks: true)
   .context
     %cite.cgray
       = render partial: 'issue_context', locals: { issue: @issue }

app/views/projects/merge_requests/_merge_request.html.haml

@@ -27,7 +27,9 @@
       %span
         %i.fa.fa-clock-o
         = merge_request.milestone.title
-
+    - if merge_request.tasks?
+      %span.task-status
+        = merge_request.task_status
 
     .pull-right
       %small updated #{time_ago_with_tooltip(merge_request.updated_at, 'bottom', 'merge_request_updated_ago')}

app/views/projects/merge_requests/show/_mr_box.html.haml

@@ -18,7 +18,7 @@
     .description
       .wiki
         = preserve do
-          = markdown @merge_request.description
+          = markdown(@merge_request.description, parse_tasks: true)
 
   .context
     %cite.cgray

lib/gitlab/markdown.rb

@@ -33,6 +33,11 @@ module Gitlab
 
     attr_reader :html_options
 
+    def gfm_with_tasks(text, project = @project, html_options = {})
+      text = gfm(text, project, html_options)
+      parse_tasks(text)
+    end
+
     # Public: Parse the provided text with GitLab-Flavored Markdown
     #
     # text         - the source text
@@ -265,5 +270,24 @@ module Gitlab
       )
       link_to("#{prefix_text}##{identifier}", url, options)
     end
+
+    # Turn list items that start with "[ ]" into HTML checkbox inputs.
+    def parse_tasks(text)
+      li_tag = '<li class="task-list-item">'
+      unchecked_box = '<input type="checkbox" value="on" disabled />'
+      checked_box = unchecked_box.sub(/\/>$/, 'checked="checked" />')
+
+      # Regexp captures don't seem to work when +text+ is an
+      # ActiveSupport::SafeBuffer, hence the `String.new`
+      String.new(text).gsub(Taskable::TASK_PATTERN_HTML) do
+        checked = $LAST_MATCH_INFO[:checked].downcase == 'x'
+
+        if checked
+          "#{li_tag}#{checked_box}"
+        else
+          "#{li_tag}#{unchecked_box}"
+        end
+      end
+    end
   end
 end

lib/redcarpet/render/gitlab_html.rb

@@ -47,6 +47,10 @@ class Redcarpet::Render::GitlabHTML < Redcarpet::Render::HTML
     unless @template.instance_variable_get("@project_wiki") || @project.nil?
       full_document = h.create_relative_links(full_document)
     end
-    h.gfm(full_document)
+    if @options[:parse_tasks]
+      h.gfm_with_tasks(full_document)
+    else
+      h.gfm(full_document)
+    end
   end
 end