Add a clear command to clear filters

app/models/command/clear_filters.rb

@@ -0,0 +1,20 @@
+class Command::ClearFilters < Command
+  store_accessor :data, :params
+
+  def title
+    "Clear filters"
+  end
+
+  def execute
+    redirect_to cards_path(**params.to_h.with_indifferent_access.without(*filters_to_clear))
+  end
+
+  private
+    FILTERS_TO_KEEP = [ :collection_ids, :indexed_by ]
+
+    def filters_to_clear
+      Filter::Params::PERMITTED_PARAMS
+        .flat_map { |param| param.is_a?(Hash) ? param.keys : param }
+        .without(*FILTERS_TO_KEEP)
+    end
+end

app/models/command/parser.rb

@@ -25,6 +25,8 @@ class Command::Parser
         Command::GoToUser.new(user_id: assignee_from(command_name)&.id)
       when "/assign", "/assignto"
         Command::Assign.new(assignee_ids: assignees_from(command_arguments).collect(&:id), card_ids: cards.ids)
+      when "/clear"
+        Command::ClearFilters.new(params: filter.as_params)
       when "/close"
         Command::Close.new(card_ids: cards.ids, reason: command_arguments.join(" "))
       when "/tag"

app/views/commands/_help.html.erb

@@ -14,6 +14,8 @@
     <dd>Filter multiple cards by their IDs</dd>
     <dt><code>search_term</code></dt>
     <dd>Search for cards containing the term</dd>
+    <dt><code>/clear</code></dt>
+    <dd>Clear all the filters</dd>
 
     <h3>Cards</h3>
     <dt><code>/assign [username 1] [username 2]...</code></dt>

test/models/command/clear_filters_test.rb

@@ -0,0 +1,15 @@
+require "test_helper"
+
+class Command::FilterTest < ActionDispatch::IntegrationTest
+  include CommandTestHelper
+
+  setup do
+    Current.session = sessions(:david)
+  end
+
+  test "clear the filters keeping the selected collections" do
+    result = execute_command "/clear", context_url: "?card_ids%5B%5D=1&card_ids%5B%5D=2&collection_ids%5B%5D=#{collections(:writebook).id}&indexed_by=newest&terms%5B%5D=jorge"
+
+    assert_equal cards_path(indexed_by: "newest", collection_ids: [ collections(:writebook).id ]), result.url
+  end
+end