[Refactor/Bugfix] Improve null ls handler (#1277)

11 files changed, 577 insertions, 474 deletions

diff --git a/lua/core/galaxyline.lua b/lua/core/galaxyline.lua
index ee0a317d..512dd78c 100644
--- a/lua/core/galaxyline.lua
+++ b/lua/core/galaxyline.lua
@@ -204,19 +204,23 @@ table.insert(gls.right, {
 
 local function get_attached_provider_name(msg)
   msg = msg or "LSP Inactive"
+
   local buf_clients = vim.lsp.buf_get_clients()
   if next(buf_clients) == nil then
     return msg
   end
-  local buf_ft = vim.bo.filetype
+
   local buf_client_names = {}
-  local null_ls_providers = require("lsp.null-ls").get_registered_providers_by_filetype(buf_ft)
   for _, client in pairs(buf_clients) do
     if client.name ~= "null-ls" then
       table.insert(buf_client_names, client.name)
     end
   end
+
+  local null_ls = require "lsp.null-ls"
+  local null_ls_providers = null_ls.list_supported_provider_names(vim.bo.filetype)
   vim.list_extend(buf_client_names, null_ls_providers)
+
   return table.concat(buf_client_names, ", ")
 end
 
diff --git a/lua/core/info.lua b/lua/core/info.lua
index 5e5c5edc..1610e763 100644
--- a/lua/core/info.lua
+++ b/lua/core/info.lua
@@ -1,6 +1,4 @@
 local M = {}
-local u = require "utils"
-local null_ls_handler = require "lsp.null-ls"
 local indent = "  "
 
 M.banner = {
@@ -25,7 +23,8 @@ local function str_list(list)
 end
 
 local function get_formatter_suggestion_msg(ft)
-  local supported_formatters = u.get_supported_formatters_by_filetype(ft)
+  local null_formatters = require "lsp.null-ls.formatters"
+  local supported_formatters = null_formatters.list_available(ft)
   return {
     indent
       .. "───────────────────────────────────────────────────────────────────",
@@ -36,7 +35,7 @@ local function get_formatter_suggestion_msg(ft)
     indent .. "* Configured formatter needs to be installed and executable.",
     indent .. "* Enable installed formatter(s) with following config in ~/.config/lvim/config.lua",
     "",
-    indent .. "  lvim.lang." .. tostring(ft) .. [[.formatting = { { exe = ']] .. table.concat(
+    indent .. "  lvim.lang." .. tostring(ft) .. [[.formatters = { { exe = ']] .. table.concat(
       supported_formatters,
       "│"
     ) .. [[' } }]],
@@ -45,7 +44,8 @@ local function get_formatter_suggestion_msg(ft)
 end
 
 local function get_linter_suggestion_msg(ft)
-  local supported_linters = u.get_supported_linters_by_filetype(ft)
+  local null_linters = require "lsp.null-ls.linters"
+  local supported_linters = null_linters.list_available(ft)
   return {
     indent
       .. "───────────────────────────────────────────────────────────────────",
@@ -129,16 +129,14 @@ local function tbl_set_highlight(terms, highlight_group)
 end
 
 function M.toggle_popup(ft)
-  local client = u.get_active_client_by_ft(ft)
+  local lsp_utils = require "lsp.utils"
+  local client = lsp_utils.get_active_client_by_ft(ft)
   local is_client_active = false
   local client_enabled_caps = {}
   local client_name = ""
   local client_id = 0
   local document_formatting = false
-  local missing_linters = {}
-  local missing_formatters = {}
   local num_caps = 0
-  local null_ls_providers = null_ls_handler.get_registered_providers_by_filetype(ft)
   if client ~= nil then
     is_client_active = not client.is_stopped()
     client_enabled_caps = require("lsp").get_ls_capabilities(client.id)
@@ -147,10 +145,6 @@ function M.toggle_popup(ft)
     client_id = client.id
     document_formatting = client.resolved_capabilities.document_formatting
   end
-  if lvim.lang[ft] ~= nil then
-    missing_linters = lvim.lang[ft].linters._failed_requests or {}
-    missing_formatters = lvim.lang[ft].formatters._failed_requests or {}
-  end
 
   local buf_lines = {}
   vim.list_extend(buf_lines, M.banner)
@@ -173,23 +167,27 @@ function M.toggle_popup(ft)
   }
   vim.list_extend(buf_lines, lsp_info)
 
+  local null_ls = require "lsp.null-ls"
+  local registered_providers = null_ls.list_supported_provider_names(ft)
   local null_ls_info = {
     indent .. "Formatters and linters",
-    indent .. "* Configured providers: " .. table.concat(null_ls_providers, "  , ") .. "  ",
+    indent .. "* Configured providers: " .. table.concat(registered_providers, "  , ") .. "  ",
   }
   vim.list_extend(buf_lines, null_ls_info)
 
-  local missing_formatters_status
+  local null_formatters = require "lsp.null-ls.formatters"
+  local missing_formatters = null_formatters.list_unsupported_names(ft)
   if vim.tbl_count(missing_formatters) > 0 then
-    missing_formatters_status = {
+    local missing_formatters_status = {
       indent .. "* Missing formatters:   " .. table.concat(missing_formatters, "  , ") .. "  ",
     }
     vim.list_extend(buf_lines, missing_formatters_status)
   end
 
-  local missing_linters_status
+  local null_linters = require "lsp.null-ls.linters"
+  local missing_linters = null_linters.list_unsupported_names(ft)
   if vim.tbl_count(missing_linters) > 0 then
-    missing_linters_status = {
+    local missing_linters_status = {
       indent .. "* Missing linters:      " .. table.concat(missing_linters, "  , ") .. "  ",
     }
     vim.list_extend(buf_lines, missing_linters_status)
@@ -198,7 +196,6 @@ function M.toggle_popup(ft)
   vim.list_extend(buf_lines, { "" })
 
   vim.list_extend(buf_lines, get_formatter_suggestion_msg(ft))
-
   vim.list_extend(buf_lines, get_linter_suggestion_msg(ft))
 
   local function set_syntax_hl()
@@ -209,11 +206,11 @@ function M.toggle_popup(ft)
     vim.cmd('let m=matchadd("LvimInfoIdentifier", " ' .. ft .. '$")')
     vim.cmd 'let m=matchadd("string", "true")'
     vim.cmd 'let m=matchadd("error", "false")'
-    tbl_set_highlight(null_ls_providers, "LvimInfoIdentifier")
+    tbl_set_highlight(registered_providers, "LvimInfoIdentifier")
     tbl_set_highlight(missing_formatters, "LvimInfoIdentifier")
     tbl_set_highlight(missing_linters, "LvimInfoIdentifier")
-    -- tbl_set_highlight(u.get_supported_formatters_by_filetype(ft), "LvimInfoIdentifier")
-    -- tbl_set_highlight(u.get_supported_linters_by_filetype(ft), "LvimInfoIdentifier")
+    -- tbl_set_highlight(require("lsp.null-ls.formatters").list_available(ft), "LvimInfoIdentifier")
+    -- tbl_set_highlight(require("lsp.null-ls.linters").list_available(ft), "LvimInfoIdentifier")
     vim.cmd('let m=matchadd("LvimInfoIdentifier", "' .. client_name .. '")')
   end
 
diff --git a/lua/default-config.lua b/lua/default-config.lua
index bba21206..13f74c30 100644
--- a/lua/default-config.lua
+++ b/lua/default-config.lua
@@ -127,11 +127,10 @@ end
 lvim.lang = {
   asm = {
     formatters = {
-      {
-        -- @usage can be asmfmt
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "asmfmt",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -141,11 +140,10 @@ lvim.lang = {
   },
   beancount = {
     formatters = {
-      {
-        -- @usage can be bean_format
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "bean_format",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -160,12 +158,14 @@ lvim.lang = {
   },
   c = {
     formatters = {
-      {
-        -- @usage can be clang_format or uncrustify
-        exe = "",
-        args = {},
-        stdin = true,
-      },
+      -- {
+      --   exe = "clang_format",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "uncrustify",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -187,12 +187,14 @@ lvim.lang = {
   },
   cpp = {
     formatters = {
-      {
-        -- @usage can be clang_format or uncrustify
-        exe = "",
-        args = {},
-        stdin = true,
-      },
+      -- {
+      --   exe = "clang_format",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "uncrustify",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -214,11 +216,10 @@ lvim.lang = {
   },
   crystal = {
     formatters = {
-      {
-        -- @usage can be crystal_format
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "crystal_format",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -233,11 +234,14 @@ lvim.lang = {
   },
   cs = {
     formatters = {
-      {
-        -- @usage can be clang_format or uncrustify
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "clang_format ",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "uncrustify",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -257,11 +261,10 @@ lvim.lang = {
   },
   cmake = {
     formatters = {
-      {
-        -- @usage can be cmake_format
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "cmake_format",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -277,10 +280,7 @@ lvim.lang = {
     },
   },
   clojure = {
-    formatters = { {
-      exe = "",
-      args = {},
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "clojure_lsp",
@@ -297,11 +297,14 @@ lvim.lang = {
   },
   css = {
     formatters = {
-      {
-        -- @usage can be prettier or prettierd
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -320,11 +323,14 @@ lvim.lang = {
   },
   less = {
     formatters = {
-      {
-        -- @usage can be prettier or prettierd
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -343,11 +349,10 @@ lvim.lang = {
   },
   d = {
     formatters = {
-      {
-        -- @usage can be dfmt
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "dfmt",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -362,12 +367,10 @@ lvim.lang = {
   },
   dart = {
     formatters = {
-      {
-        -- @usage can be dart_format
-        exe = "",
-        args = {},
-        stdin = true,
-      },
+      -- {
+      --   exe = "dart_format",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -385,13 +388,7 @@ lvim.lang = {
     },
   },
   docker = {
-    formatters = {
-      {
-        exe = "",
-        args = {},
-      },
-      -- @usage can be {"hadolint"}
-    },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "dockerls",
@@ -408,12 +405,10 @@ lvim.lang = {
   },
   elixir = {
     formatters = {
-      {
-        -- @usage can be mix
-        exe = "",
-        args = {},
-        stdin = true,
-      },
+      -- {
+      --   exe = "mix",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -430,12 +425,10 @@ lvim.lang = {
   },
   elm = {
     formatters = {
-      {
-        -- @usage can be elm_format
-        exe = "",
-        args = {},
-        stdin = true,
-      },
+      -- {
+      --   exe = "elm_format",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -457,11 +450,10 @@ lvim.lang = {
   },
   erlang = {
     formatters = {
-      {
-        -- @usage can be erlfmt
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "erlfmt",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -479,11 +471,10 @@ lvim.lang = {
   emmet = { active = false },
   fish = {
     formatters = {
-      {
-        -- @usage can be fish_indent
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "fish_indent",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -497,12 +488,18 @@ lvim.lang = {
   },
   go = {
     formatters = {
-      {
-        -- @usage can be gofmt or goimports or gofumpt
-        exe = "",
-        args = {},
-        stdin = true,
-      },
+      -- {
+      --   exe = "gofmt",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "goimports",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "gofumpt",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -518,10 +515,7 @@ lvim.lang = {
     },
   },
   graphql = {
-    formatters = { {
-      exe = "",
-      args = {},
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "graphql",
@@ -539,10 +533,7 @@ lvim.lang = {
     },
   },
   haskell = {
-    formatters = { {
-      exe = "",
-      args = {},
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "hls",
@@ -556,11 +547,14 @@ lvim.lang = {
   },
   html = {
     formatters = {
-      {
-        -- @usage can be prettier or prettierd
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -579,11 +573,14 @@ lvim.lang = {
   },
   java = {
     formatters = {
-      {
-        -- @usage can be clang_format or uncrustify
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "clang_format",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "uncrustify",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -598,12 +595,18 @@ lvim.lang = {
   },
   json = {
     formatters = {
-      {
-        -- @usage can be json_tool or prettier or prettierd
-        exe = "",
-        args = {},
-        stdin = true,
-      },
+      -- {
+      --   exe = "json_tool",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -639,10 +642,7 @@ lvim.lang = {
     },
   },
   julia = {
-    formatters = { {
-      exe = "",
-      args = {},
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "julials",
@@ -661,10 +661,7 @@ lvim.lang = {
     },
   },
   kotlin = {
-    formatters = { {
-      exe = "",
-      args = {},
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "kotlin_language_server",
@@ -695,11 +692,14 @@ lvim.lang = {
   },
   lua = {
     formatters = {
-      {
-        -- @usage can be stylua or lua_format
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "stylua",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "lua_format",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -742,25 +742,23 @@ lvim.lang = {
   },
   nginx = {
     formatters = {
-      {
-        -- @usage can be nginx_beautifier
-        exe = "",
-        args = {
-          provider = "",
-          setup = {},
-        },
-      },
+      -- {
+      --   exe = "nginx_beautifier",
+      --   args = {
+      --     provider = "",
+      --     setup = {},
+      --   },
+      -- },
     },
     linters = {},
     lsp = {},
   },
   perl = {
     formatters = {
-      {
-        -- @usage can be perltidy
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "perltidy",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -770,11 +768,10 @@ lvim.lang = {
   },
   sql = {
     formatters = {
-      {
-        -- @usage can be sqlformat
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "sqlformat",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -786,11 +783,10 @@ lvim.lang = {
   },
   php = {
     formatters = {
-      {
-        -- @usage can be phpcbf
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "phpcbf",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -814,10 +810,7 @@ lvim.lang = {
     },
   },
   puppet = {
-    formatters = { {
-      exe = "",
-      args = {},
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "puppet",
@@ -829,12 +822,19 @@ lvim.lang = {
     },
   },
   javascript = {
-    -- @usage can be prettier or prettier_d_slim or prettierd
     formatters = {
-      {
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettier_d_slim",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
     },
     -- @usage can be {"eslint"} or {"eslint_d"}
     linters = {},
@@ -854,13 +854,19 @@ lvim.lang = {
   },
   javascriptreact = {
     formatters = {
-      {
-        -- @usage can be prettier or prettier_d_slim or prettierd
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettier_d_slim",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
     },
-    -- @usage can be {"eslint"} or {"eslint_d"}
     linters = {},
     lsp = {
       provider = "tsserver",
@@ -878,11 +884,14 @@ lvim.lang = {
   },
   python = {
     formatters = {
-      {
-        -- @usage can be black or yapf or isort
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "yapf",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "isort",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -902,11 +911,10 @@ lvim.lang = {
   -- R -e 'install.packages("readr",repos = "http://cran.us.r-project.org")'
   r = {
     formatters = {
-      {
-        -- @usage can be format_r
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "format_r",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -926,11 +934,10 @@ lvim.lang = {
   },
   ruby = {
     formatters = {
-      {
-        -- @usage can be rufo
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "rufo",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -961,11 +968,10 @@ lvim.lang = {
   },
   rust = {
     formatters = {
-      {
-        -- @usage can be rustfmt
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "rustfmt",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -982,11 +988,10 @@ lvim.lang = {
   },
   scala = {
     formatters = {
-      {
-        -- @usage can be scalafmt
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "scalafmt",
+      --   args = {},
+      -- },
     },
     linters = { "" },
     lsp = {
@@ -1000,11 +1005,10 @@ lvim.lang = {
   },
   sh = {
     formatters = {
-      {
-        -- @usage can be shfmt
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "shfmt",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -1021,10 +1025,7 @@ lvim.lang = {
     },
   },
   svelte = {
-    formatters = { {
-      exe = "",
-      args = {},
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "svelte",
@@ -1041,11 +1042,10 @@ lvim.lang = {
   },
   swift = {
     formatters = {
-      {
-        -- @usage can be swiftformat
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "swiftformat",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -1075,11 +1075,10 @@ lvim.lang = {
   },
   terraform = {
     formatters = {
-      {
-        -- @usage can be terraform_fmt
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "terraform_fmt",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -1096,14 +1095,7 @@ lvim.lang = {
     },
   },
   tex = {
-    formatters = {
-      {
-        exe = "",
-        args = {},
-        stdin = false,
-      },
-      -- @usage can be chktex or vale
-    },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "texlab",
@@ -1117,12 +1109,18 @@ lvim.lang = {
   },
   typescript = {
     formatters = {
-      {
-        -- @usage can be prettier or prettierd or prettier_d_slim
-        exe = "",
-        args = {},
-      },
-      -- @usage can be {"eslint"} or {"eslint_d"}
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettier_d_slim",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -1141,11 +1139,18 @@ lvim.lang = {
   },
   typescriptreact = {
     formatters = {
-      {
-        -- @usage can be prettier or prettierd or prettier_d_slim
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettier_d_slim",
+      --   args = {},
+      -- },
     },
     -- @usage can be {"eslint"} or {"eslint_d"}
     linters = {},
@@ -1164,13 +1169,7 @@ lvim.lang = {
     },
   },
   vim = {
-    formatters = {
-      {
-        exe = "",
-        args = {},
-      },
-    },
-    -- @usage can be {"vint"}
+    formatters = {},
     linters = { "" },
     lsp = {
       provider = "vimls",
@@ -1187,13 +1186,19 @@ lvim.lang = {
   },
   vue = {
     formatters = {
-      {
-        -- @usage can be prettier or prettierd or prettier_d_slim
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettier_d_slim",
+      --   args = {},
+      -- },
     },
-    -- @usage can be {"eslint"} or {"eslint_d"}
     linters = {},
     lsp = {
       provider = "vuels",
@@ -1209,11 +1214,14 @@ lvim.lang = {
   },
   yaml = {
     formatters = {
-      {
-        -- @usage can be prettier or prettierd
-        exe = "",
-        args = {},
-      },
+      -- {
+      --   exe = "prettier",
+      --   args = {},
+      -- },
+      -- {
+      --   exe = "prettierd",
+      --   args = {},
+      -- },
     },
     linters = {},
     lsp = {
@@ -1230,11 +1238,7 @@ lvim.lang = {
     },
   },
   zig = {
-    formatters = { {
-      exe = "",
-      args = {},
-      stdin = false,
-    } },
+    formatters = {},
     linters = {},
     lsp = {
       provider = "zls",
diff --git a/lua/lsp/init.lua b/lua/lsp/init.lua
index e4ea02db..891147e5 100644
--- a/lua/lsp/init.lua
+++ b/lua/lsp/init.lua
@@ -1,5 +1,6 @@
 local M = {}
 local Log = require "core.log"
+
 function M.config()
   vim.lsp.protocol.CompletionItemKind = lvim.lsp.completion.item_kind
 
@@ -127,13 +128,13 @@ function M.common_on_attach(client, bufnr)
 end
 
 function M.setup(lang)
+  local lsp_utils = require "lsp.utils"
   local lsp = lvim.lang[lang].lsp
-  if require("utils").check_lsp_client_active(lsp.provider) then
+  if lsp_utils.is_client_active(lsp.provider) then
     return
   end
 
   local overrides = lvim.lsp.override
-
   if type(overrides) == "table" then
     if vim.tbl_contains(overrides, lang) then
       return
diff --git a/lua/lsp/null-ls.lua b/lua/lsp/null-ls.lua
deleted file mode 100644
index 2ce98f2c..00000000
--- a/lua/lsp/null-ls.lua
+++ /dev/null
@@ -1,142 +0,0 @@
-local M = {}
-local Log = require "core.log"
-
-local null_ls = require "null-ls"
-
-local nodejs_local_providers = { "prettier", "prettierd", "prettier_d_slim", "eslint_d", "eslint" }
-
-M.requested_providers = {}
-
-function M.get_registered_providers_by_filetype(ft)
-  local matches = {}
-  for _, provider in pairs(M.requested_providers) do
-    if vim.tbl_contains(provider.filetypes, ft) then
-      local provider_name = provider.name
-      -- special case: show "eslint_d" instead of eslint
-      -- https://github.com/jose-elias-alvarez/null-ls.nvim/blob/9b8458bd1648e84169a7e8638091ba15c2f20fc0/doc/BUILTINS.md#eslint
-      if string.find(provider._opts.command, "eslint_d") then
-        provider_name = "eslint_d"
-      end
-      table.insert(matches, provider_name)
-    end
-  end
-
-  return matches
-end
-
-function M.get_missing_providers_by_filetype(ft)
-  local matches = {}
-  for _, provider in pairs(M.requested_providers) do
-    if vim.tbl_contains(provider.filetypes, ft) then
-      local provider_name = provider.name
-
-      table.insert(matches, provider_name)
-    end
-  end
-
-  return matches
-end
-
-local function register_failed_request(ft, provider, operation)
-  if not lvim.lang[ft][operation]._failed_requests then
-    lvim.lang[ft][operation]._failed_requests = {}
-  end
-  table.insert(lvim.lang[ft][operation]._failed_requests, provider)
-end
-
-local function validate_nodejs_provider(provider)
-  local command_path
-  local root_dir
-  if lvim.builtin.rooter.active then
-    --- use vim-rooter to set root_dir
-    vim.cmd "let root_dir = FindRootDirectory()"
-    root_dir = vim.api.nvim_get_var "root_dir"
-  else
-    --- use LSP to set root_dir
-    local ts_client = require("utils").get_active_client_by_ft "typescript"
-    if ts_client == nil then
-      Log:get_default().error "Unable to determine root directory since tsserver didn't start correctly"
-      return
-    end
-    root_dir = ts_client.config.root_dir
-  end
-  local local_nodejs_command = root_dir .. "/node_modules/.bin/" .. provider._opts.command
-  Log:get_default().debug("checking for local node module: ", vim.inspect(provider))
-
-  if vim.fn.executable(local_nodejs_command) == 1 then
-    command_path = local_nodejs_command
-  elseif vim.fn.executable(provider._opts.command) == 1 then
-    Log:get_default().debug("checking in global path instead for node module", provider._opts.command)
-    command_path = provider._opts.command
-  else
-    Log:get_default().debug("Unable to find node module", provider._opts.command)
-  end
-  return command_path
-end
-
-local function validate_provider_request(provider)
-  if provider == "" or provider == nil then
-    return
-  end
-  -- NOTE: we can't use provider.name because eslint_d uses eslint name
-  if vim.tbl_contains(nodejs_local_providers, provider._opts.command) then
-    return validate_nodejs_provider(provider)
-  end
-  if vim.fn.executable(provider._opts.command) ~= 1 then
-    Log:get_default().debug("Unable to find the path for", vim.inspect(provider))
-    Log:get_default().warn("Unable to find the path for ", provider._opts.command)
-    return
-  end
-  return provider._opts.command
-end
-
--- TODO: for linters and formatters with spaces and '-' replace with '_'
-function M.setup(filetype)
-  for _, formatter in pairs(lvim.lang[filetype].formatters) do
-    Log:get_default().debug("validating format provider: ", formatter.exe)
-    local builtin_formatter = null_ls.builtins.formatting[formatter.exe]
-    if not vim.tbl_contains(M.requested_providers, builtin_formatter) then
-      -- FIXME: why doesn't this work?
-      builtin_formatter._opts.args = formatter.args or builtin_formatter._opts.args
-      -- builtin_formatter._opts.to_stdin = formatter.stdin or builtin_formatter._opts.to_stdin
-      local resolved_path = validate_provider_request(builtin_formatter)
-      if resolved_path then
-        builtin_formatter._opts.command = resolved_path
-        table.insert(M.requested_providers, builtin_formatter)
-        Log:get_default().info("Using format provider", builtin_formatter.name)
-      else
-        -- mark it here to avoid re-doing the lookup again
-        register_failed_request(filetype, formatter.exe, "formatters")
-      end
-    end
-  end
-
-  for _, linter in pairs(lvim.lang[filetype].linters) do
-    local builtin_diagnoser = null_ls.builtins.diagnostics[linter.exe]
-    Log:get_default().debug("validating lint provider: ", linter.exe)
-    -- special case: fallback to "eslint"
-    -- https://github.com/jose-elias-alvarez/null-ls.nvim/blob/9b8458bd1648e84169a7e8638091ba15c2f20fc0/doc/BUILTINS.md#eslint
-    -- if provider.exe
-    if linter.exe == "eslint_d" then
-      builtin_diagnoser = null_ls.builtins.diagnostics.eslint.with { command = "eslint_d" }
-    end
-    if not vim.tbl_contains(M.requested_providers, builtin_diagnoser) then
-      -- FIXME: why doesn't this work?
-      -- builtin_diagnoser._opts.args = linter.args or builtin_diagnoser._opts.args
-      -- builtin_diagnoser._opts.to_stdin = linter.stdin or builtin_diagnoser._opts.to_stdin
-      local resolved_path = validate_provider_request(builtin_diagnoser)
-      if resolved_path then
-        builtin_diagnoser._opts.command = resolved_path
-        table.insert(M.requested_providers, builtin_diagnoser)
-        Log:get_default().info("Using linter provider", builtin_diagnoser.name)
-      else
-        -- mark it here to avoid re-doing the lookup again
-        register_failed_request(filetype, linter.exe, "linters")
-      end
-    end
-  end
-
-  null_ls.register { sources = M.requested_providers }
-end
-
-return M
diff --git a/lua/lsp/null-ls/formatters.lua b/lua/lsp/null-ls/formatters.lua
new file mode 100644
index 00000000..dd88fa60
--- /dev/null
+++ b/lua/lsp/null-ls/formatters.lua
@@ -0,0 +1,79 @@
+local M = {}
+local formatters_by_ft = {}
+
+local null_ls = require "null-ls"
+local services = require "lsp.null-ls.services"
+local logger = require("core.log"):get_default()
+
+local function list_names(formatters, options)
+  options = options or {}
+  local names = {}
+
+  local filter = options.filter or "supported"
+  for name, _ in pairs(formatters[filter]) do
+    table.insert(names, name)
+  end
+
+  return names
+end
+
+function M.list_supported_names(filetype)
+  if not formatters_by_ft[filetype] then
+    return {}
+  end
+  return list_names(formatters_by_ft[filetype], { filter = "supported" })
+end
+
+function M.list_unsupported_names(filetype)
+  if not formatters_by_ft[filetype] then
+    return {}
+  end
+  return list_names(formatters_by_ft[filetype], { filter = "unsupported" })
+end
+
+function M.list_available(filetype)
+  local formatters = {}
+  for _, provider in pairs(null_ls.builtins.formatting) do
+    -- TODO: Add support for wildcard filetypes
+    if vim.tbl_contains(provider.filetypes or {}, filetype) then
+      table.insert(formatters, provider.name)
+    end
+  end
+
+  return formatters
+end
+
+function M.list_configured(formatter_configs)
+  local formatters, errors = {}, {}
+
+  for _, fmt_config in ipairs(formatter_configs) do
+    local formatter = null_ls.builtins.formatting[fmt_config.exe]
+
+    if not formatter then
+      logger.error("Not a valid formatter:", fmt_config.exe)
+      errors[fmt_config.exe] = {} -- Add data here when necessary
+    else
+      local formatter_cmd = services.find_command(formatter._opts.command)
+      if not formatter_cmd then
+        logger.warn("Not found:", formatter._opts.command)
+        errors[fmt_config.exe] = {} -- Add data here when necessary
+      else
+        logger.info("Using formatter:", formatter_cmd)
+        formatters[fmt_config.exe] = formatter.with { command = formatter_cmd, args = fmt_config.args }
+      end
+    end
+  end
+
+  return { supported = formatters, unsupported = errors }
+end
+
+function M.setup(filetype, options)
+  if formatters_by_ft[filetype] and not options.force_reload then
+    return
+  end
+
+  formatters_by_ft[filetype] = M.list_configured(lvim.lang[filetype].formatters)
+  null_ls.register { sources = formatters_by_ft[filetype].supported }
+end
+
+return M
diff --git a/lua/lsp/null-ls/init.lua b/lua/lsp/null-ls/init.lua
new file mode 100644
index 00000000..8691982e
--- /dev/null
+++ b/lua/lsp/null-ls/init.lua
@@ -0,0 +1,44 @@
+local M = {}
+
+function M.list_supported_provider_names(filetype)
+  local names = {}
+
+  local formatters = require "lsp.null-ls.formatters"
+  local linters = require "lsp.null-ls.linters"
+
+  vim.list_extend(names, formatters.list_supported_names(filetype))
+  vim.list_extend(names, linters.list_supported_names(filetype))
+
+  return names
+end
+
+function M.list_unsupported_provider_names(filetype)
+  local names = {}
+
+  local formatters = require "lsp.null-ls.formatters"
+  local linters = require "lsp.null-ls.linters"
+
+  vim.list_extend(names, formatters.list_unsupported_names(filetype))
+  vim.list_extend(names, linters.list_unsupported_names(filetype))
+
+  return names
+end
+
+-- TODO: for linters and formatters with spaces and '-' replace with '_'
+function M.setup(filetype, options)
+  options = options or {}
+
+  local ok, _ = pcall(require, "null-ls")
+  if not ok then
+    require("core.log"):get_default().error "Missing null-ls dependency"
+    return
+  end
+
+  local formatters = require "lsp.null-ls.formatters"
+  local linters = require "lsp.null-ls.linters"
+
+  formatters.setup(filetype, options)
+  linters.setup(filetype, options)
+end
+
+return M
diff --git a/lua/lsp/null-ls/linters.lua b/lua/lsp/null-ls/linters.lua
new file mode 100644
index 00000000..780a9c4d
--- /dev/null
+++ b/lua/lsp/null-ls/linters.lua
@@ -0,0 +1,79 @@
+local M = {}
+local linters_by_ft = {}
+
+local null_ls = require "null-ls"
+local services = require "lsp.null-ls.services"
+local logger = require("core.log"):get_default()
+
+local function list_names(linters, options)
+  options = options or {}
+  local names = {}
+
+  local filter = options.filter or "supported"
+  for name, _ in pairs(linters[filter]) do
+    table.insert(names, name)
+  end
+
+  return names
+end
+
+function M.list_supported_names(filetype)
+  if not linters_by_ft[filetype] then
+    return {}
+  end
+  return list_names(linters_by_ft[filetype], { filter = "supported" })
+end
+
+function M.list_unsupported_names(filetype)
+  if not linters_by_ft[filetype] then
+    return {}
+  end
+  return list_names(linters_by_ft[filetype], { filter = "unsupported" })
+end
+
+function M.list_available(filetype)
+  local linters = {}
+  for _, provider in pairs(null_ls.builtins.diagnostics) do
+    -- TODO: Add support for wildcard filetypes
+    if vim.tbl_contains(provider.filetypes or {}, filetype) then
+      table.insert(linters, provider.name)
+    end
+  end
+
+  return linters
+end
+
+function M.list_configured(linter_configs)
+  local linters, errors = {}, {}
+
+  for _, lnt_config in pairs(linter_configs) do
+    local linter = null_ls.builtins.diagnostics[lnt_config.exe]
+
+    if not linter then
+      logger.error("Not a valid linter:", lnt_config.exe)
+      errors[lnt_config.exe] = {} -- Add data here when necessary
+    else
+      local linter_cmd = services.find_command(linter._opts.command)
+      if not linter_cmd then
+        logger.warn("Not found:", linter._opts.command)
+        errors[lnt_config.exe] = {} -- Add data here when necessary
+      else
+        logger.info("Using linter:", linter_cmd)
+        linters[lnt_config.exe] = linter.with { command = linter_cmd, args = lnt_config.args }
+      end
+    end
+  end
+
+  return { supported = linters, unsupported = errors }
+end
+
+function M.setup(filetype, options)
+  if linters_by_ft[filetype] and not options.force_reload then
+    return
+  end
+
+  linters_by_ft[filetype] = M.list_configured(lvim.lang[filetype].linters)
+  null_ls.register { sources = linters_by_ft[filetype].supported }
+end
+
+return M
diff --git a/lua/lsp/null-ls/services.lua b/lua/lsp/null-ls/services.lua
new file mode 100644
index 00000000..89073e5c
--- /dev/null
+++ b/lua/lsp/null-ls/services.lua
@@ -0,0 +1,55 @@
+local M = {}
+
+local logger = require("core.log"):get_default()
+
+local function find_root_dir()
+  if lvim.builtin.rooter.active then
+    --- use vim-rooter to set root_dir
+    vim.cmd "let root_dir = FindRootDirectory()"
+    return vim.api.nvim_get_var "root_dir"
+  end
+
+  -- TODO: Rework this to not make it javascript specific
+  --- use LSP to set root_dir
+  local lsp_utils = require "lsp.utils"
+  local ts_client = lsp_utils.get_active_client_by_ft "typescript"
+  if ts_client == nil then
+    logger.error "Unable to determine root directory since tsserver didn't start correctly"
+    return nil
+  end
+
+  return ts_client.config.root_dir
+end
+
+local function from_node_modules(command)
+  local root_dir = find_root_dir()
+  if not root_dir then
+    return nil
+  end
+
+  return root_dir .. "/node_modules/.bin/" .. command
+end
+
+local local_providers = {
+  prettier = { find = from_node_modules },
+  prettierd = { find = from_node_modules },
+  prettier_d_slim = { find = from_node_modules },
+  eslint_d = { find = from_node_modules },
+  eslint = { find = from_node_modules },
+}
+
+function M.find_command(command)
+  if local_providers[command] then
+    local local_command = local_providers[command].find(command)
+    if local_command and vim.fn.executable(local_command) == 1 then
+      return local_command
+    end
+  end
+
+  if vim.fn.executable(command) == 1 then
+    return command
+  end
+  return nil
+end
+
+return M
diff --git a/lua/lsp/utils.lua b/lua/lsp/utils.lua
new file mode 100644
index 00000000..e28c6085
--- /dev/null
+++ b/lua/lsp/utils.lua
@@ -0,0 +1,27 @@
+local M = {}
+
+function M.is_client_active(name)
+  local clients = vim.lsp.get_active_clients()
+  for _, client in pairs(clients) do
+    if client.name == name then
+      return true
+    end
+  end
+  return false
+end
+
+function M.get_active_client_by_ft(filetype)
+  if not lvim.lang[filetype] or not lvim.lang[filetype].lsp then
+    return nil
+  end
+
+  local clients = vim.lsp.get_active_clients()
+  for _, client in pairs(clients) do
+    if client.name == lvim.lang[filetype].lsp.provider then
+      return client
+    end
+  end
+  return nil
+end
+
+return M
diff --git a/lua/utils/init.lua b/lua/utils/init.lua
index 8264189d..0f42623b 100644
--- a/lua/utils/init.lua
+++ b/lua/utils/init.lua
@@ -99,55 +99,10 @@ function utils.reload_lv_config()
   vim.cmd ":PackerCompile"
   vim.cmd ":PackerInstall"
   -- vim.cmd ":PackerClean"
-  Log:get_default().info "Reloaded configuration"
-end
-
-function utils.check_lsp_client_active(name)
-  local clients = vim.lsp.get_active_clients()
-  for _, client in pairs(clients) do
-    if client.name == name then
-      return true
-    end
-  end
-  return false
-end
-
-function utils.get_active_client_by_ft(filetype)
-  local clients = vim.lsp.get_active_clients()
-  for _, client in pairs(clients) do
-    if client.name == lvim.lang[filetype].lsp.provider then
-      return client
-    end
-  end
-  return nil
-end
+  local null_ls = require "lsp.null-ls"
+  null_ls.setup(vim.bo.filetype, { force_reload = true })
 
--- TODO: consider porting this logic to null-ls instead
-function utils.get_supported_linters_by_filetype(filetype)
-  local null_ls = require "null-ls"
-  local matches = {}
-  for _, provider in pairs(null_ls.builtins.diagnostics) do
-    if vim.tbl_contains(provider.filetypes, filetype) then
-      local provider_name = provider.name
-
-      table.insert(matches, provider_name)
-    end
-  end
-
-  return matches
-end
-
-function utils.get_supported_formatters_by_filetype(filetype)
-  local null_ls = require "null-ls"
-  local matches = {}
-  for _, provider in pairs(null_ls.builtins.formatting) do
-    if provider.filetypes and vim.tbl_contains(provider.filetypes, filetype) then
-      -- table.insert(matches, { provider.name, ft })
-      table.insert(matches, provider.name)
-    end
-  end
-
-  return matches
+  Log:get_default().info "Reloaded configuration"
 end
 
 function utils.unrequire(m)