feat(startup): Source runtime/plugin/**/*.lua at startup

For opt plugins these files are sourced on `:packadd`

* `:runtime` Now can exexute lua files

3 files changed, 63 insertions, 0 deletions

diff --git a/test/functional/core/startup_spec.lua b/test/functional/core/startup_spec.lua
index d5f03db03a..258fea85e4 100644
--- a/test/functional/core/startup_spec.lua
+++ b/test/functional/core/startup_spec.lua
@@ -11,6 +11,7 @@ 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
@@ -494,6 +495,53 @@ 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()
diff --git a/test/functional/helpers.lua b/test/functional/helpers.lua
index 4acb1a7d8d..08ca14c3df 100644
--- a/test/functional/helpers.lua
+++ b/test/functional/helpers.lua
@@ -878,6 +878,11 @@ function module.os_kill(pid)
     or  'kill -9 '..pid..' > /dev/null'))
 end
 
+-- Create directories with non exsisting intermidiate directories
+function module.mkdir_p(path)
+  return module.meths.call_function('mkdir', {path, 'p'})
+end
+
 module = global_helpers.tbl_extend('error', module, global_helpers)
 
 return function(after_each)
diff --git a/test/functional/legacy/packadd_spec.lua b/test/functional/legacy/packadd_spec.lua
index 486a1fe471..48cd3ef9f8 100644
--- a/test/functional/legacy/packadd_spec.lua
+++ b/test/functional/legacy/packadd_spec.lua
@@ -101,9 +101,14 @@ describe('packadd', function()
         call setline(1, 'let g:plugin_works = 24')
         wq
 
+        exe 'split ' . plugdir . '/plugin/test.lua'
+        call setline(1, 'vim.g.plugin_lua_works = 24')
+        wq
+
         packadd other
 
         call assert_equal(24, g:plugin_works)
+        call assert_equal(24, g:plugin_lua_works)
         call assert_true(len(&rtp) > len(rtp))
         call assert_match(Escape(plugdir) . '\($\|,\)', &rtp)
       endfunc
@@ -117,13 +122,18 @@ describe('packadd', function()
         exe 'split ' . s:plugdir . '/plugin/test.vim'
         call setline(1, 'let g:plugin_works = 42')
         wq
+        exe 'split ' . s:plugdir . '/plugin/test.lua'
+        call setline(1, 'let g:plugin_lua_works = 42')
+        wq
         let g:plugin_works = 0
+        let g:plugin_lua_works = 0
 
         packadd! mytest
 
         call assert_true(len(&rtp) > len(rtp))
         call assert_match(Escape(s:plugdir) . '\($\|,\)', &rtp)
         call assert_equal(0, g:plugin_works)
+        call assert_equal(0, g:plugin_lua_works)
 
         " check the path is not added twice
         let new_rtp = &rtp