Partial support for syntax highlighting without proper app

Author: tpope

after/syntax/ruby/rails.vim

@@ -1,21 +1,33 @@
-if !exists('*RailsDetect') || !RailsDetect()
-  finish
-endif
+hi def link rubyEntity                      rubyMacro
+hi def link rubyEntities                    rubyMacro
+hi def link rubyExceptionHandler            rubyMacro
+hi def link rubyValidation                  rubyMacro
+hi def link rubyCallback                    rubyMacro
+hi def link rubyRakeMacro                   rubyMacro
+hi def link rubyTestMacro                   rubyMacro
+hi def link rubyMacro                       Macro
+hi def link rubyRoute                       rubyControl
+hi def link rubySchema                      rubyControl
+hi def link rubyResponse                    rubyControl
+hi def link rubyUrlHelper                   rubyHelper
+hi def link rubyViewHelper                  rubyHelper
+hi def link rubyTestHelper                  rubyHelper
+hi def link rubyUserAssertion               rubyAssertion
+hi def link rubyAssertion                   rubyException
+hi def link rubyTestAction                  rubyControl
+hi def link rubyHelper                      Function
 
-syn keyword rubyAttribute class_attribute
-syn keyword rubyAttribute attr_internal attr_internal_accessor attr_internal_reader attr_internal_writer
-syn keyword rubyAttribute cattr_accessor cattr_reader cattr_writer mattr_accessor mattr_reader mattr_writer
-syn keyword rubyAttribute thread_cattr_accessor thread_cattr_reader thread_cattr_writer thread_mattr_accessor thread_mattr_reader thread_mattr_writer
-syn keyword rubyMacro alias_attribute concern concerning delegate delegate_missing_to with_options
+let s:has_app = exists('*RailsDetect') && RailsDetect()
+let s:path = tr(expand('%:p'), '\', '/')
 
-if rails#buffer().type_name('channel','controller','helper','job','mailer','model','view')
+if s:path =~# '\v/app/%(channels|controllers|helpers|jobs|mailers|models)/.*\.rb$\|/app/views/'
   syn keyword rubyHelper logger
 endif
 
-if rails#buffer().type_name('model-observer')
+if s:path =~# '/app/models/.*_observer\.rb$'
   syn keyword rubyMacro observe
 
-elseif rails#buffer().type_name('model')
+elseif s:path =~# '/app/models/.*\.rb$'
   syn keyword rubyMacro accepts_nested_attributes_for attr_readonly attribute enum serialize store store_accessor
   syn keyword rubyMacro default_scope scope
   syn keyword rubyEntity belongs_to has_one composed_of
@@ -31,13 +43,13 @@ elseif rails#buffer().type_name('model')
   syn keyword rubyMacro validate has_secure_password has_secure_token
 endif
 
-if rails#buffer().type_name('job')
+if s:path =~# '/app/jobs/.*\.rb$'
   syn keyword rubyMacro queue_as
   syn keyword rubyExceptionHandler rescue_from retry_on discard_on
   syn keyword rubyCallback before_enqueue around_enqueue after_enqueue before_perform around_perform after_perform
 endif
 
-if rails#buffer().type_name('helper','view')
+if s:path =~# '/app/helpers/.*_helper\.rb$\|/app/views/'
   syn keyword rubyViewHelper
         \ action_name asset_pack_path asset_path asset_url atom_feed audio_path audio_tag audio_url auto_discovery_link_tag
         \ button_tag button_to
@@ -63,27 +75,27 @@ if rails#buffer().type_name('helper','view')
   syn match rubyViewHelper '\<select\>\%(\s*{\|\s*do\>\|\s*(\=\s*&\)\@!'
   syn match rubyViewHelper '\<\%(content_for\w\@!?\=\|current_page?\)'
   syn match rubyViewHelper '\.\@<!\<\(h\|html_escape\|u\|url_encode\)\>'
-  if rails#buffer().type_name('view-partial')
+  if s:path =~# '_[^\/]*$'
     syn keyword rubyViewHelper local_assigns
   endif
 endif
 
-if rails#buffer().type_name('controller')
+if s:path =~# '/app/controllers/.*\.rb$'
   syn keyword rubyHelper params request response session headers cookies flash
   syn keyword rubyMacro protect_from_forgery
   syn match   rubyMacro '\<respond_to\>\ze[( ] *[:*]'
   syn match   rubyResponse '\<respond_to\>\ze[( ] *\%([&{]\|do\>\)'
   syn keyword rubyResponse render head redirect_to redirect_back respond_with send_data send_file
 endif
 
-if rails#buffer().type_name('controller', 'mailer')
+if s:path =~# '/app/controllers/.*\.rb$\|/app/mailers/.*\.rb$\|/app/models/.*_mailer\.rb$'
   syn keyword rubyHelper render_to_string
   syn keyword rubyCallback before_action append_before_action prepend_before_action after_action append_after_action prepend_after_action around_action append_around_action prepend_around_action skip_before_action skip_after_action skip_action
   syn keyword rubyMacro helper helper_attr helper_method layout
   syn keyword rubyExceptionHandler rescue_from
 endif
 
-if rails#buffer().type_name('mailer')
+if s:path =~# '/app/mailers/.*\.rb$\|/app/models/.*_mailer\.rb$'
   syn keyword rubyResponse mail render
   syn match   rubyResponse "\<headers\>"
   syn match   rubyHelper "\<headers\[\@="
@@ -92,16 +104,16 @@ if rails#buffer().type_name('mailer')
   syn keyword rubyMacro register_interceptor register_interceptors register_observer register_observers
 endif
 
-if rails#buffer().type_name('model-concern', 'controller-concern')
+if s:path =~# '/app/\w\+/concerns/.*\.rb$'
   syn keyword rubyMacro included class_methods
 endif
 
-if rails#buffer().type_name('controller','helper','mailer','view') ||
-      \ rails#buffer().type_name('test-controller', 'test-integration', 'test-system', 'spec-request', 'spec-feature', 'cucumber')
+if s:path =~# '\v/app/%(controllers|helpers|mailers).*\.rb$|/app/views/' ||
+      \ s:has_app && rails#buffer().type_name('test-controller', 'test-integration', 'test-system', 'spec-request', 'spec-feature', 'cucumber')
   syn keyword rubyUrlHelper url_for polymorphic_path polymorphic_url edit_polymorphic_path edit_polymorphic_url new_polymorphic_path new_polymorphic_url
 endif
 
-if rails#buffer().type_name('db-migration','db-schema')
+if s:path =~# '/db/migrate/.*\.rb$\|/db/schema\.rb$'
   syn keyword rubySchema create_table change_table drop_table rename_table create_join_table drop_join_table
   syn keyword rubySchema add_column rename_column change_column change_column_default change_column_null remove_column remove_columns
   syn keyword rubySchema add_foreign_key remove_foreign_key
@@ -112,11 +124,11 @@ if rails#buffer().type_name('db-migration','db-schema')
   syn keyword rubySchema execute transaction
 endif
 
-if rails#buffer().type_name('task')
+if s:path =~# '\.rake$\|/Rakefile[^/]*$'
   syn match rubyRakeMacro '^\s*\zs\%(task\|file\|namespace\|desc\)\>\%(\s*=\)\@!'
 endif
 
-if rails#buffer().type_name('config-routes')
+if s:path =~# '/config/routes\>.*\.rb$'
   syn keyword rubyRoute resource resources collection member new nested shallow
   syn keyword rubyRoute match get put patch post delete root mount
   syn keyword rubyRoute scope controller namespace constraints defaults
@@ -125,14 +137,39 @@ if rails#buffer().type_name('config-routes')
   syn keyword rubyHelper redirect
 endif
 
+if s:path =~# '/test\%(/\|/.*/\)test_[^\/]*\.rb$\|/test/.*_test\.rb$\|/features/step_definitions/.*\.rb$'
+  syn keyword rubyAssertion refute refute_empty refute_equal refute_in_delta refute_in_epsilon refute_includes refute_instance_of refute_kind_of refute_match refute_nil refute_operator refute_predicate refute_respond_to refute_same
+  syn keyword rubyAssertion assert assert_block assert_equal assert_includes assert_in_delta assert_instance_of assert_kind_of assert_match assert_nil assert_no_match assert_not assert_not_equal assert_not_includes assert_not_nil assert_not_same assert_nothing_raised assert_nothing_thrown assert_operator assert_raise assert_respond_to assert_same assert_send assert_throws
+  syn keyword rubyAssertion flunk
+endif
+
+if s:path =~# '/spec/.*_spec\.rb$'
+  syn match rubyTestHelper '\<subject\>'
+  syn match rubyTestMacro '\<\%(let\|given\)\>!\='
+  syn match rubyTestMacro '\<subject\>!\=\ze\s*\%([({&:]\|do\>\)'
+  syn keyword rubyTestMacro before after around background setup teardown
+  syn keyword rubyTestMacro context describe feature shared_context shared_examples shared_examples_for containedin=rubyKeywordAsMethod
+  syn keyword rubyTestMacro it example specify scenario include_examples include_context it_should_behave_like it_behaves_like
+  syn keyword rubyComment xcontext xdescribe xfeature containedin=rubyKeywordAsMethod
+  syn keyword rubyComment xit xexample xspecify xscenario
+endif
+if s:path =~# '/spec/.*_spec\.rb$\|/features/step_definitions/.*\.rb$'
+  syn keyword rubyAssertion pending skip expect is_expected expect_any_instance_of allow allow_any_instance_of
+  syn keyword rubyTestHelper described_class
+  syn keyword rubyTestHelper double instance_double class_double object_double
+  syn keyword rubyTestHelper spy instance_spy class_spy object_spy
+  syn keyword rubyTestAction stub_const hide_const
+endif
+
+if !s:has_app
+  finish
+endif
+
 if rails#buffer().type_name('test')
   if !empty(rails#app().user_assertions())
     exe "syn keyword rubyUserAssertion ".join(rails#app().user_assertions())
   endif
   syn keyword rubyTestMacro test setup teardown
-  syn keyword rubyAssertion refute refute_empty refute_equal refute_in_delta refute_in_epsilon refute_includes refute_instance_of refute_kind_of refute_match refute_nil refute_operator refute_predicate refute_respond_to refute_same
-  syn keyword rubyAssertion assert assert_block assert_equal assert_includes assert_in_delta assert_instance_of assert_kind_of assert_match assert_nil assert_no_match assert_not assert_not_equal assert_not_includes assert_not_nil assert_not_same assert_nothing_raised assert_nothing_thrown assert_operator assert_raise assert_respond_to assert_same assert_send assert_throws
-  syn keyword rubyAssertion flunk
   syn keyword rubyAssertion assert_difference assert_no_difference
   syn keyword rubyTestAction travel travel_to travel_back
 endif
@@ -152,23 +189,6 @@ if rails#buffer().type_name('test-system')
   syn keyword rubyAssertion    refute_button    refute_checked_field    refute_content    refute_css    refute_current_path    refute_field    refute_link    refute_select    refute_selector    refute_table    refute_text    refute_title    refute_unchecked_field    refute_xpath
 endif
 
-if rails#buffer().type_name('spec')
-  syn match rubyTestHelper '\<subject\>'
-  syn match rubyTestMacro '\<\%(let\|given\)\>!\='
-  syn match rubyTestMacro '\<subject\>!\=\ze\s*\%([({&:]\|do\>\)'
-  syn keyword rubyTestMacro before after around background setup teardown
-  syn keyword rubyTestMacro context describe feature shared_context shared_examples shared_examples_for containedin=rubyKeywordAsMethod
-  syn keyword rubyTestMacro it example specify scenario include_examples include_context it_should_behave_like it_behaves_like
-  syn keyword rubyComment xcontext xdescribe xfeature containedin=rubyKeywordAsMethod
-  syn keyword rubyComment xit xexample xspecify xscenario
-endif
-if rails#buffer().type_name('spec', 'cucumber')
-  syn keyword rubyAssertion pending skip expect is_expected expect_any_instance_of allow allow_any_instance_of
-  syn keyword rubyTestHelper described_class
-  syn keyword rubyTestHelper double instance_double class_double object_double
-  syn keyword rubyTestHelper spy instance_spy class_spy object_spy
-  syn keyword rubyTestAction stub_const hide_const
-endif
 if rails#buffer().type_name('spec-controller')
   syn keyword rubyTestMacro render_views
   syn keyword rubyTestHelper assigns
@@ -202,6 +222,12 @@ if rails#buffer().type_name('test-system', 'spec-feature', 'cucumber')
   syn keyword rubyTestAction attach_file check choose click_button click_link click_link_or_button click_on fill_in select uncheck unselect
 endif
 
+syn keyword rubyAttribute class_attribute
+syn keyword rubyAttribute attr_internal attr_internal_accessor attr_internal_reader attr_internal_writer
+syn keyword rubyAttribute cattr_accessor cattr_reader cattr_writer mattr_accessor mattr_reader mattr_writer
+syn keyword rubyAttribute thread_cattr_accessor thread_cattr_reader thread_cattr_writer thread_mattr_accessor thread_mattr_reader thread_mattr_writer
+syn keyword rubyMacro alias_attribute concern concerning delegate delegate_missing_to with_options
+
 let s:keywords = split(join(filter(rails#buffer().projected('keywords'),
       \ 'type(v:val) == type("")'), ' '))
 let s:special = filter(copy(s:keywords), 'v:val =~# ''^\h\k*[?!]$''')
@@ -213,22 +239,3 @@ endif
 if !empty(s:regular)
   exe 'syn keyword' s:group join(s:regular, ' ')
 endif
-
-hi def link rubyEntity                      rubyMacro
-hi def link rubyEntities                    rubyMacro
-hi def link rubyExceptionHandler            rubyMacro
-hi def link rubyValidation                  rubyMacro
-hi def link rubyCallback                    rubyMacro
-hi def link rubyRakeMacro                   rubyMacro
-hi def link rubyTestMacro                   rubyMacro
-hi def link rubyMacro                       Macro
-hi def link rubyRoute                       rubyControl
-hi def link rubySchema                      rubyControl
-hi def link rubyResponse                    rubyControl
-hi def link rubyUrlHelper                   rubyHelper
-hi def link rubyViewHelper                  rubyHelper
-hi def link rubyTestHelper                  rubyHelper
-hi def link rubyUserAssertion               rubyAssertion
-hi def link rubyAssertion                   rubyException
-hi def link rubyTestAction                  rubyControl
-hi def link rubyHelper                      Function