fix(completion): include lua syntaxes in :ownsyntax completion (#21941)

This just removes DIP_LUA and always executes its branches.
Also add tests for cmdline completion for other lua runtime files.

test/functional/lua/runtime_spec.lua

@@ -4,6 +4,7 @@ local clear = helpers.clear
 local eq = helpers.eq
 local eval = helpers.eval
 local exec = helpers.exec
+local funcs = helpers.funcs
 local mkdir_p = helpers.mkdir_p
 local rmdir = helpers.rmdir
 local write_file = helpers.write_file
@@ -29,6 +30,7 @@ describe('runtime:', function()
 
   after_each(function()
     rmdir(plug_dir)
+    exec('bwipe!')
   end)
 
   describe('colors', function()
@@ -39,6 +41,8 @@ describe('runtime:', function()
       mkdir_p(colorscheme_folder)
       write_file(colorscheme_file, [[vim.g.lua_colorscheme = 1]])
 
+      eq({'new_colorscheme'}, funcs.getcompletion('new_c', 'color'))
+
       exec('colorscheme new_colorscheme')
 
       eq(1, eval('g:lua_colorscheme'))
@@ -64,23 +68,25 @@ describe('runtime:', function()
     it('loads lua compilers', function()
       local compiler_file = compiler_folder .. sep .. 'new_compiler.lua'
       mkdir_p(compiler_folder)
-      write_file(compiler_file, [[vim.g.lua_compiler = 1]])
+      write_file(compiler_file, [[vim.b.lua_compiler = 1]])
+
+      eq({'new_compiler'}, funcs.getcompletion('new_c', 'compiler'))
 
       exec('compiler new_compiler')
 
-      eq(1, eval('g:lua_compiler'))
+      eq(1, eval('b:lua_compiler'))
       rmdir(compiler_folder)
     end)
 
     it('loads vim compilers when both lua and vim version exist', function()
       local compiler_file = compiler_folder .. sep .. 'new_compiler'
       mkdir_p(compiler_folder)
-      write_file(compiler_file..'.vim', [[let g:compiler = 'vim']])
-      write_file(compiler_file..'.lua', [[vim.g.compiler = 'lua']])
+      write_file(compiler_file..'.vim', [[let b:compiler = 'vim']])
+      write_file(compiler_file..'.lua', [[vim.b.compiler = 'lua']])
 
       exec('compiler new_compiler')
 
-      eq('vim', eval('g:compiler'))
+      eq('vim', eval('b:compiler'))
       rmdir(compiler_folder)
     end)
   end)
@@ -91,10 +97,12 @@ describe('runtime:', function()
     it('loads lua ftplugins', function()
       local ftplugin_file = table.concat({ftplugin_folder , 'new-ft.lua'}, sep)
       mkdir_p(ftplugin_folder)
-      write_file(ftplugin_file , [[vim.g.lua_ftplugin = 1]])
+      write_file(ftplugin_file , [[vim.b.lua_ftplugin = 1]])
+
+      eq({'new-ft'}, funcs.getcompletion('new-f', 'filetype'))
 
       exec [[set filetype=new-ft]]
-      eq(1, eval('g:lua_ftplugin'))
+      eq(1, eval('b:lua_ftplugin'))
       rmdir(ftplugin_folder)
     end)
   end)
@@ -105,10 +113,12 @@ describe('runtime:', function()
     it('loads lua indents', function()
       local indent_file = table.concat({indent_folder , 'new-ft.lua'}, sep)
       mkdir_p(indent_folder)
-      write_file(indent_file , [[vim.g.lua_indent = 1]])
+      write_file(indent_file , [[vim.b.lua_indent = 1]])
+
+      eq({'new-ft'}, funcs.getcompletion('new-f', 'filetype'))
 
       exec [[set filetype=new-ft]]
-      eq(1, eval('g:lua_indent'))
+      eq(1, eval('b:lua_indent'))
       rmdir(indent_folder)
     end)
   end)
@@ -116,24 +126,32 @@ describe('runtime:', function()
   describe('syntax', function()
     local syntax_folder = table.concat({plug_dir, 'syntax'}, sep)
 
-    it('loads lua syntaxes on filetype change', function()
+    before_each(function()
       local syntax_file = table.concat({syntax_folder , 'my-lang.lua'}, sep)
       mkdir_p(syntax_folder)
-      write_file(syntax_file , [[vim.g.lua_syntax = 1]])
+      write_file(syntax_file , [[vim.b.current_syntax = 'my-lang']])
+      exec([[let b:current_syntax = '']])
+    end)
 
+    it('loads lua syntaxes on filetype change', function()
       exec('set filetype=my-lang')
-      eq(1, eval('g:lua_syntax'))
-      rmdir(syntax_folder)
+      eq('my-lang', eval('b:current_syntax'))
     end)
 
     it('loads lua syntaxes on syntax change', function()
-      local syntax_file = table.concat({syntax_folder , 'my-lang.lua'}, sep)
-      mkdir_p(syntax_folder)
-      write_file(syntax_file , [[vim.g.lua_syntax = 5]])
-
       exec('set syntax=my-lang')
-      eq(5, eval('g:lua_syntax'))
-      rmdir(syntax_folder)
+      eq('my-lang', eval('b:current_syntax'))
+    end)
+
+    it('loads lua syntaxes for :ownsyntax', function()
+      exec('ownsyntax my-lang')
+      eq('my-lang', eval('w:current_syntax'))
+      eq('', eval('b:current_syntax'))
+    end)
+
+    it('lua syntaxes are included in cmdline completion', function()
+      eq({'my-lang'}, funcs.getcompletion('my-l', 'filetype'))
+      eq({'my-lang'}, funcs.getcompletion('my-l', 'syntax'))
     end)
   end)