Rename from service, and move to lib/gitlab

app/services/mattermost/commands/issue_search_service.rb

-module Mattermost
-  module Commands
-    class IssueSearchService < IssueService
-      def execute
-        present search_results
-      end
-    end
-  end
-end

app/services/mattermost/commands/issue_show_service.rb

-module Mattermost
-  module Commands
-    class IssueShowService < IssueService
-      def execute
-        present find_by_iid
-      end
-    end
-  end
-end

app/services/mattermost/commands/merge_request_search_service.rb

-module Mattermost
-  module Commands
-    class MergeRequestSearchService < MergeRequestService
-      def execute
-        present search_results
-      end
-    end
-  end
-end

app/services/mattermost/commands/merge_request_show_service.rb

-module Mattermost
-  module Commands
-    class MergeRequestShowService < MergeRequestService
-      def execute
-        present find_by_iid
-      end
-    end
-  end
-end

app/services/mattermost/slash_command_service.rb

-module Mattermost
-  class SlashCommandService < BaseService
-    def self.registry
-      @registry ||= Hash.new({})
-    end
-
-    def self.command(command, sub_command, klass, help_message)
-      registry[command][sub_command] = { klass: klass, help_message: help_message }
-    end
-
-    command 'issue', 'show',    Mattermost::Commands::IssueShowService,   'issue show <id>'
-    command 'issue', 'search',  Mattermost::Commands::IssueSearchService, 'issue search <query>'
-    command 'issue', 'create',  Mattermost::Commands::IssueCreateService, 'issue create my title'
-
-    command 'mergerequest', 'show',   Mattermost::Commands::MergeRequestShowService,    'mergerequest show <id>'
-    command 'mergerequest', 'search', Mattermost::Commands::MergeRequestSearchService,  'mergerequest search <query>'
-
-    def execute
-      command, subcommand = parse_command
-
-      #TODO think how to do this to support ruby 2.1
-      service = registry.dig(command, subcommand, :klass)
-
-      return help_messages(registry) unless service.try(:available?, project)
-
-      service.new(project, current_user, params).execute
-    end
-
-    private
-
-    def parse_command
-      params[:text].split.first(2)
-    end
-
-    def registry
-      self.class.registry
-    end
-  end
-end

app/services/mattermost/commands/base_service.rb → lib/gitlab/chat_commands/base_command.rb

-module Mattermost
-  module Commands
-    class BaseService < ::BaseService
+module Gitlab
+  module ChatCommands
+    class BaseCommand
       QUERY_LIMIT = 5
 
-      def execute
+      def self.match(_)
         raise NotImplementedError
       end
 
-      def available?
+      def self.help_message
+        raise NotImplementedError
+      end
+
+      def self.available?(_)
+        raise NotImplementedError
+      end
+
+      def execute(_)
         raise NotImplementedError
       end
 
@@ -15,33 +23,33 @@ module Mattermost
         raise NotImplementedError
       end
 
+      attr_accessor :project, :current_user, :params
+
+      def initialize(project, user, params = {})
+        @project, @current_user, @params = project, user, params.dup
+      end
+
       private
 
+      def can?(object, action, subject)
+        Ability.allowed?(object, action, subject)
+      end
+
       def present(resource)
         Mattermost::Presenter.present(resource)
       end
 
-      def find_by_iid
+      def find_by_iid(iid)
         resource = collection.find_by(iid: iid)
 
         readable?(resource) ? resource : nil
       end
 
-      def search_results
+      def search_results(query)
         collection.search(query).limit(QUERY_LIMIT).select do |resource|
           readable?(resource)
         end
       end
-
-      # params[:text] = issue search <search query>
-      def query
-        params[:text].split[2..-1].join(' ')
-      end
-
-      # params[:text] = 'mergerequest show 123'
-      def iid
-        params[:text].split[2]
-      end
     end
   end
 end

lib/gitlab/chat_commands/command.rb

+module Gitlab
+  module ChatCommands
+    class Command < BaseCommand
+      COMMANDS = [
+        Gitlab::ChatCommands::IssueShow,
+        Gitlab::ChatCommands::IssueSearch,
+        Gitlab::ChatCommands::IssueCreate,
+
+        Gitlab::ChatCommands::MergeRequestShow,
+        Gitlab::ChatCommands::MergeRequestSearch,
+      ].freeze
+
+      def execute
+        klass, match = fetch_klass
+
+        return help(help_messages) unless klass.try(:available?, project)
+
+        klass.new(project, current_user, params).execute(match)
+      end
+
+      private
+
+      def fetch_klass
+        match = nil
+        service = COMMANDS.find do |klass|
+          if klass.available?(project)
+            false
+          else
+            match = klass.match(command)
+          end
+        end
+
+        [service, match]
+      end
+
+      def help_messages
+        COMMANDS.map do |klass|
+          next unless klass.available?(project)
+
+          klass.help_message
+        end.compact
+      end
+
+      def command
+        params[:text]
+      end
+    end
+  end
+end

app/services/mattermost/commands/issue_service.rb → lib/gitlab/chat_commands/issue_command.rb

-module Mattermost
-  module Commands
-    class IssueService < Mattermost::Commands::BaseService
+module Gitlab
+  module ChatCommands
+    class IssueCommand < BaseCommand
       def self.available?(project)
         project.issues_enabled? && project.default_issues_tracker?
       end

app/services/mattermost/commands/issue_create_service.rb → lib/gitlab/chat_commands/issue_create.rb

-module Mattermost
-  module Commands
-    class IssueCreateService < IssueService
-      def execute
-        title, description = parse_command
-
-        present Issues::CreateService.new(project, current_user, title: title, description: description).execute
+module Gitlab
+  module ChatCommands
+    class IssueCreate < BaseCommand
+      def self.match(text)
+        /\Aissue\s+create\s+(?<title>[^\n]*)\n*(?<description>.*)\z/.match(text)
       end
 
-      private
-
-      def parse_command
-        match = params[:text].match(/\Aissue create (?<title>.*)\n*/)
+      def execute(match)
         title = match[:title]
-        description = match.post_match
+        description = match[:description]
 
-        [title, description]
+        present Issues::CreateService.new(project, current_user, title: title, description: description).execute
       end
     end
   end

lib/gitlab/chat_commands/issue_search.rb

+module Gitlab
+  module ChatCommands
+    class IssueSearch < IssueCommand
+      def self.match(text)
+        /\Aissue\s+search\s+(?<query>.*)/.match(text)
+      end
+
+      def self.help_message
+        "issue search <query>"
+      end
+
+      def execute(match)
+        present search_results(match[:query])
+      end
+    end
+  end
+end

lib/gitlab/chat_commands/issue_show.rb

+module Gitlab
+  module ChatCommands
+    class IssueShow < IssueCommand
+      def self.match(text)
+        /\Aissue\s+show\s+(?<iid>\d+)/.match(text)
+      end
+
+      def self.help_message
+        "issue show <id>"
+      end
+
+      def execute(match)
+        present find_by_iid(match[:iid])
+      end
+    end
+  end
+end

app/services/mattermost/commands/merge_request_service.rb → lib/gitlab/chat_commands/merge_request_command.rb

-module Mattermost
-  module Commands
-    class MergeRequestService < Mattermost::Commands::BaseService
+module Gitlab
+  module ChatCommands
+    class MergeRequestCommand < BaseCommand
       def self.available?(project)
         project.merge_requests_enabled?
       end

lib/gitlab/chat_commands/merge_request_search.rb

+module Gitlab
+  module ChatCommands
+    class MergeRequestSearch < MergeRequestCommand
+      def self.match(text)
+        /\Amergerequest\s+search\s+(?<query>.*)/.match(text)
+      end
+
+      def self.help_message
+        "mergerequest search <query>"
+      end
+
+      def execute(match)
+        present search_results(match[:query])
+      end
+    end
+  end
+end

lib/gitlab/chat_commands/merge_request_show.rb

+module Gitlab
+  module ChatCommands
+    class MergeRequestShow < MergeRequestCommand
+      def self.match(text)
+        /\Amergerequest\s+show\s+(?<iid>\d+)/.match(text)
+      end
+
+      def self.help_message
+        "mergerequest show <id>"
+      end
+
+      def execute(match)
+        present find_by_iid(match[:iid])
+      end
+    end
+  end
+end

lib/mattermost/presenter.rb

@@ -12,12 +12,11 @@ module Mattermost
         }
       end
 
-      # TODO figure out how I know which are available or not
-      def help_message(commands)
+      def help(messages)
         messages = ["Available commands:"]
 
-        commands.each do |sub_command, attrs|
-          messages << "\t#{COMMAND_PREFIX} #{attrs[:help_message]}"
+        messages.each do |messsage|
+          messages << "- #{message}"
         end
 
         {

spec/services/mattermost/slash_command_service_spec.rb → spec/lib/gitlab/chat_commands/command_spec.rb

 require 'spec_helper'
 
-describe Mattermost::SlashCommandService, service: true do
-  let(:project)         { build(:project) }
-  let(:user)            { build(:user) }
+describe Gitlab::ChatCommands::Command, service: true do
+  let(:project)         { create(:project) }
+  let(:user)            { create(:user) }
   let(:params)          { { text: 'issue show 1' } }
 
   subject { described_class.new(project, user, params).execute }

spec/services/mattermost/commands/issue_create_service_spec.rb → spec/lib/gitlab/chat_commands/issue_create_spec.rb

 require 'spec_helper'
 
-describe Mattermost::Commands::IssueCreateService, service: true do
+describe Gitlab::ChatCommands::IssueCreate, service: true do
   describe '#execute' do
     let(:project)  { create(:empty_project) }
     let(:user)     { create(:user) }
-    let(:params)   { { text: "issue create bird is the word" } }
+    let(:regex_match) { described_class.match("issue create bird is the word") }
 
     before { project.team << [user, :master] }
 
-    subject { described_class.new(project, user, params).execute }
+    subject { described_class.new(project, user).execute(regex_match) }
 
     context 'without description' do
       it 'creates the issue' do
@@ -23,7 +23,7 @@ describe Mattermost::Commands::IssueCreateService, service: true do
 
     context 'with description' do
       let(:description) { "Surfin bird" }
-      let(:params) { { text: "issue create The bird is the word\n#{description}" } }
+      let(:regex_match) { described_class.match("issue create bird is the word\n#{description}") }
 
       before { subject }
 

spec/services/mattermost/commands/issue_search_service_spec.rb → spec/lib/gitlab/chat_commands/issue_search_spec.rb

 require 'spec_helper'
 
-describe Mattermost::Commands::IssueSearchService, service: true do
+describe Gitlab::ChatCommands::IssueSearch, service: true do
   describe '#execute' do
     let!(:issue)    { create(:issue, title: 'The bird is the word') }
     let(:project)  { issue.project }
     let(:user)     { issue.author }
-    let(:params)   { { text: "issue search bird is the" } }
+    let(:regex_match) { described_class.match("issue search bird is the") }
 
     before { project.team << [user, :master] }
 
-    subject { described_class.new(project, user, params).execute }
+    subject { described_class.new(project, user).execute(regex_match) }
 
     context 'without results' do
-      let(:params) { { text: "issue search no results for this one" } }
+      let(:regex_match) { described_class.match("issue search no results for this one") }
 
       it "returns nil" do
         expect(subject[:response_type]).to be :ephemeral

spec/services/mattermost/commands/issue_show_service_spec.rb → spec/lib/gitlab/chat_commands/issue_show_spec.rb

 require 'spec_helper'
 
-describe Mattermost::Commands::IssueShowService, service: true do
+describe Gitlab::ChatCommands::IssueShow, service: true do
   describe '#execute' do
     let(:issue)    { create(:issue) }
     let(:project)  { issue.project }
     let(:user)     { issue.author }
-    let(:params)   { { text: "issue show #{issue.iid}" } }
+    let(:regex_match) { described_class.match("issue show #{issue.iid}") }
 
     before { project.team << [user, :master] }
 
-    subject { described_class.new(project, user, params).execute }
+    subject { described_class.new(project, user).execute(regex_match) }
 
     context 'the issue exists' do
       it 'returns the issue' do
-
         expect(subject[:response_type]).to be :in_channel
         expect(subject[:text]).to match issue.title
       end
     end
 
     context 'the issue does not exist' do
-      let(:params) { { text: "issue show 12345" } }
+      let(:regex_match) { described_class.match("issue show 1234") }
 
       it "returns nil" do
         expect(subject[:response_type]).to be :ephemeral

spec/services/mattermost/commands/merge_request_search_service_spec.rb → spec/lib/gitlab/chat_commands/merge_request_search_spec.rb

 require 'spec_helper'
 
-describe Mattermost::Commands::MergeRequestSearchService, service: true do
+describe Gitlab::ChatCommands::MergeRequestSearch, service: true do
   describe '#execute' do
     let!(:merge_request) { create(:merge_request, title: 'The bird is the word') }
     let(:project)        { merge_request.source_project }
     let(:user)           { merge_request.author }
-    let(:params)         { { text: "mergerequest search #{merge_request.title}" } }
+    let(:regex_match)    { described_class.match("mergerequest search #{merge_request.title}") }
 
     before { project.team << [user, :master] }
 
-    subject { described_class.new(project, user, params).execute }
+    subject { described_class.new(project, user, {}).execute(regex_match) }
 
     context 'the merge request exists' do
       it 'returns the merge request' do
@@ -19,7 +19,7 @@ describe Mattermost::Commands::MergeRequestSearchService, service: true do
     end
 
     context 'no results can be found' do
-      let(:params) { { text: "mergerequest search 12345" } }
+      let(:regex_match) { described_class.match("mergerequest search 12334") }
 
       it "returns a 404 message" do
         expect(subject[:response_type]).to be :ephemeral
@@ -27,4 +27,10 @@ describe Mattermost::Commands::MergeRequestSearchService, service: true do
       end
     end
   end
+
+  describe 'self.match' do
+    it 'matches a valid query' do
+      expect(described_class.match("mergerequest search my title here")).to be_truthy
+    end
+  end
 end

spec/services/mattermost/commands/merge_request_show_service_spec.rb → spec/lib/gitlab/chat_commands/merge_request_show_spec.rb

 require 'spec_helper'
 
-describe Mattermost::Commands::MergeRequestShowService, service: true do
+describe Gitlab::ChatCommands::MergeRequestShow, service: true do
   describe '#execute' do
     let!(:merge_request)  { create(:merge_request) }
     let(:project)         { merge_request.source_project }
     let(:user)            { merge_request.author }
-    let(:params)          { { text: "mergerequest show #{merge_request.iid}" } }
+    let(:regex_match)     { described_class.match("mergerequest show #{merge_request.iid}") }
 
     before { project.team << [user, :master] }
 
-    subject { described_class.new(project, user, params).execute }
+    subject { described_class.new(project, user).execute(regex_match) }
 
     context 'the merge request exists' do
       it 'returns the merge request' do
@@ -19,7 +19,7 @@ describe Mattermost::Commands::MergeRequestShowService, service: true do
     end
 
     context 'the merge request does not exist' do
-      let(:params) { { text: "mergerequest show 12345" } }
+      let(:regex_match) { described_class.match("mergerequest show 12345") }
 
       it "returns nil" do
         expect(subject[:response_type]).to be :ephemeral
@@ -27,4 +27,11 @@ describe Mattermost::Commands::MergeRequestShowService, service: true do
       end
     end
   end
+
+  describe "self.match" do
+    it 'matches valid strings' do
+      expect(described_class.match("mergerequest show 123")).to be_truthy
+      expect(described_class.match("mergerequest show sdf23")).to be_falsy
+    end
+  end
 end