refactor: configure LSP in ~/.config/nvim/lua/lsp

-> moved from ~/.config/nvim/
.../nvim/lua/lsp/init.lua now has a setup() function

!!! nvim-lspconfig is now lazy-loaded
-> packer checks filetype (see .../nvim/plugins.lua)

.config/nvim/init.lua

@@ -12,13 +12,6 @@ require("statusline")   -- ./lua/statusline.lua
 
 require("polyjuice")    -- ~/.local/src/polyjuice/lua/polyjuice.lua
 
--- LSP
-require("lsp")          -- ./lua/lsp/init.lua
-require("lsp.c")        -- ./lua/lsp/c.lua
-require("lsp.lua")      -- ./lua/lsp/lua.lua
-require("lsp.python")   -- ./lua/lsp/python.lua
-require("lsp.tex")      -- ./lua/lsp/python.lua
-
 -- auto complete
 require("plugin.compe") -- ./lua/plugin/compe.lua
 

.config/nvim/lua/lsp/init.lua

@@ -3,6 +3,8 @@
 -- License       : GPLv3
 -- Description   : neovim lsp config file
 
+local lsp = {}
+
 vim.fn.sign_define(
         "LspDiagnosticsSignError",
         {
@@ -63,3 +65,11 @@ vim.lsp.protocol.CompletionItemKind = {
         "   ",       -- Operator
         "   ",       -- TypeParameter
 }
+
+function lsp.setup()
+        local ft = vim.bo.filetype
+        if ft == "cpp" then ft = "c" end
+        require("lsp." .. ft)           -- ./<ft>.lua
+end
+
+return lsp

.config/nvim/lua/plugins.lua

@@ -39,7 +39,12 @@ return require("packer").startup(function()
         }
 
         -- LSP
-        use "neovim/nvim-lspconfig"
+        use {
+                "neovim/nvim-lspconfig",
+                opt = true,
+                ft = { "c", "cpp", "lua", "python", "tex"},
+                config = function() require("lsp").setup() end
+        }
 
         -- auto completion
         use "hrsh7th/nvim-compe"