feat(runtime): Allow lua to be used in colorschemes

* tests(runtime): move runtime/plugin tests to functional/lua/runtime_spec

runtime/doc/syntax.txt

@@ -4749,8 +4749,9 @@ in their own color.
 			feature it will output "unknown".
 
 :colo[rscheme] {name}	Load color scheme {name}.  This searches 'runtimepath'
-			for the file "colors/{name}.vim".  The first one that
+			for the file "colors/{name}.(vim|lua)".  The first one that
 			is found is loaded.
+			Note: "colors/{name}.vim" is tried first.
 			Also searches all plugins in 'packpath', first below
 			"start" and then under "opt".
 

src/nvim/syntax.c

@@ -6438,6 +6438,10 @@ int load_colors(char_u *name)
   apply_autocmds(EVENT_COLORSCHEMEPRE, name, curbuf->b_fname, false, curbuf);
   snprintf((char *)buf, buflen, "colors/%s.vim", name);
   retval = source_runtime(buf, DIP_START + DIP_OPT);
+  if (retval == FAIL) {
+    snprintf((char *)buf, buflen, "colors/%s.lua", name);
+    retval = source_runtime(buf, DIP_START + DIP_OPT);
+  }
   xfree(buf);
   apply_autocmds(EVENT_COLORSCHEME, name, curbuf->b_fname, FALSE, curbuf);
 

test/functional/core/startup_spec.lua

@@ -11,7 +11,6 @@ local exec_lua = helpers.exec_lua
 local feed = helpers.feed
 local funcs = helpers.funcs
 local mkdir = helpers.mkdir
-local mkdir_p = helpers.mkdir_p
 local nvim_prog = helpers.nvim_prog
 local nvim_set = helpers.nvim_set
 local read_file = helpers.read_file
@@ -495,53 +494,6 @@ describe('user config init', function()
   end)
 end)
 
-describe('runtime/plugin', function()
-  local xhome = 'Xhome'
-  local pathsep = helpers.get_pathsep()
-  local xconfig = xhome .. pathsep .. 'Xconfig'
-
-  before_each(function()
-    mkdir_p(xconfig .. pathsep .. 'nvim')
-  end)
-
-  after_each(function()
-    rmdir(xhome)
-  end)
-
-  it('loads plugin/*.lua from XDG config home', function()
-    local plugin_folder_path = table.concat({xconfig, 'nvim', 'plugin'}, pathsep)
-    local plugin_file_path = table.concat({plugin_folder_path, 'plugin.lua'}, pathsep)
-    mkdir_p(plugin_folder_path)
-    write_file(plugin_file_path, [[
-    vim.g.lua_plugin = 1
-    ]])
-
-    clear{ args_rm={'-u' }, env={ XDG_CONFIG_HOME=xconfig }}
-
-    eq(1, eval('g:lua_plugin'))
-    rmdir(plugin_folder_path)
-  end)
-
-
-  it('loads plugin/*.lua from start plugins', function()
-    local plugin_path = table.concat({xconfig, 'nvim', 'pack', 'catagory',
-                                      'start', 'test_plugin'}, pathsep)
-    local plugin_folder_path = table.concat({plugin_path, 'plugin'}, pathsep)
-    local plugin_file_path = table.concat({plugin_folder_path, 'plugin.lua'},
-                                          pathsep)
-    mkdir_p(plugin_folder_path)
-    write_file(plugin_file_path, [[
-    vim.g.lua_plugin = 2
-    ]])
-
-    clear{ args_rm={'-u' }, env={ XDG_CONFIG_HOME=xconfig }}
-
-    eq(2, eval('g:lua_plugin'))
-    rmdir(plugin_path)
-  end)
-
-end)
-
 describe('user session', function()
   local xhome = 'Xhome'
   local pathsep = helpers.get_pathsep()

test/functional/lua/runtime_spec.lua

@@ -0,0 +1,89 @@
+local helpers = require('test.functional.helpers')(after_each)
+
+local clear = helpers.clear
+local eq = helpers.eq
+local eval = helpers.eval
+local exec = helpers.exec
+local mkdir_p = helpers.mkdir_p
+local rmdir = helpers.rmdir
+local write_file = helpers.write_file
+
+describe('runtime:', function()
+  local xhome = 'Xhome'
+  local pathsep = helpers.get_pathsep()
+  local xconfig = xhome .. pathsep .. 'Xconfig'
+
+  before_each(function()
+    clear()
+    mkdir_p(xconfig .. pathsep .. 'nvim')
+  end)
+
+  after_each(function()
+    rmdir(xhome)
+  end)
+
+  describe('plugin', function()
+    it('loads plugin/*.lua from XDG config home', function()
+      local plugin_folder_path = table.concat({xconfig, 'nvim', 'plugin'}, pathsep)
+      local plugin_file_path = table.concat({plugin_folder_path, 'plugin.lua'}, pathsep)
+      mkdir_p(plugin_folder_path)
+      write_file(plugin_file_path, [[ vim.g.lua_plugin = 1 ]])
+
+      clear{ args_rm={'-u' }, env={ XDG_CONFIG_HOME=xconfig }}
+
+      eq(1, eval('g:lua_plugin'))
+      rmdir(plugin_folder_path)
+    end)
+
+
+    it('loads plugin/*.lua from start plugins', function()
+      local plugin_path = table.concat({xconfig, 'nvim', 'pack', 'catagory',
+      'start', 'test_plugin'}, pathsep)
+      local plugin_folder_path = table.concat({plugin_path, 'plugin'}, pathsep)
+      local plugin_file_path = table.concat({plugin_folder_path, 'plugin.lua'},
+      pathsep)
+      mkdir_p(plugin_folder_path)
+      write_file(plugin_file_path, [[vim.g.lua_plugin = 2]])
+
+      clear{ args_rm={'-u' }, env={ XDG_CONFIG_HOME=xconfig }}
+
+      eq(2, eval('g:lua_plugin'))
+      rmdir(plugin_path)
+    end)
+  end)
+
+  describe('colors', function()
+    it('loads lua colorscheme', function()
+      local colorscheme_folder = table.concat({xconfig, 'nvim', 'colors'},
+                                                   pathsep)
+      local colorscheme_file = table.concat({colorscheme_folder, 'new_colorscheme.lua'},
+                                            pathsep)
+      mkdir_p(colorscheme_folder)
+      write_file(colorscheme_file, [[vim.g.lua_colorscheme = 1]])
+
+      clear{ args_rm={'-' }, env={ XDG_CONFIG_HOME=xconfig }}
+      exec('colorscheme new_colorscheme')
+
+      eq(1, eval('g:lua_colorscheme'))
+      rmdir(colorscheme_folder)
+    end)
+
+    it('loads vim colorscheme when both lua and vim version exist', function()
+      local colorscheme_folder = table.concat({xconfig, 'nvim', 'colors'},
+                                                   pathsep)
+      local colorscheme_file = table.concat({colorscheme_folder, 'new_colorscheme'},
+                                            pathsep)
+      mkdir_p(colorscheme_folder)
+      write_file(colorscheme_file..'.vim', [[let g:colorscheme = 'vim']])
+      write_file(colorscheme_file..'.lua', [[vim.g.colorscheme = 'lua']])
+
+      clear{ args_rm={'-u' }, env={ XDG_CONFIG_HOME=xconfig }}
+      exec('colorscheme new_colorscheme')
+
+      eq('vim', eval('g:colorscheme'))
+      rmdir(colorscheme_folder)
+    end)
+  end)
+
+end)
+