4 files changed, 233 insertions, 0 deletions
diff --git a/lua/lvim/lsp/null-ls/formatters.lua b/lua/lvim/lsp/null-ls/formatters.lua
new file mode 100644
index 00000000..87583abd
--- /dev/null
+++ b/lua/lvim/lsp/null-ls/formatters.lua
@@ -0,0 +1,66 @@
+local M = {}
+
+local null_ls = require "null-ls"
+local services = require "lvim.lsp.null-ls.services"
+local Log = require "lvim.core.log"
+
+function M.list_registered_providers(filetype)
+  local null_ls_methods = require "null-ls.methods"
+  local formatter_method = null_ls_methods.internal["FORMATTING"]
+  local registered_providers = services.list_registered_providers_names(filetype)
+  return registered_providers[formatter_method] or {}
+end
+
+function M.list_available(filetype)
+  local formatters = {}
+  local tbl = require "lvim.utils.table"
+  for _, provider in pairs(null_ls.builtins.formatting) do
+    if tbl.contains(provider.filetypes or {}, function(ft)
+      return ft == "*" or ft == filetype
+    end) 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_name = fmt_config.exe:gsub("-", "_")
+    local formatter = null_ls.builtins.formatting[formatter_name]
+
+    if not formatter then
+      Log: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
+        Log:warn("Not found: " .. formatter._opts.command)
+        errors[fmt_config.exe] = {} -- Add data here when necessary
+      else
+        Log:debug("Using formatter: " .. formatter_cmd)
+        formatters[fmt_config.exe] = formatter.with {
+          command = formatter_cmd,
+          extra_args = fmt_config.args,
+          filetypes = fmt_config.filetypes,
+        }
+      end
+    end
+  end
+
+  return { supported = formatters, unsupported = errors }
+end
+
+function M.setup(formatter_configs)
+  if vim.tbl_isempty(formatter_configs) then
+    return
+  end
+
+  local formatters_by_ft = M.list_configured(formatter_configs)
+  null_ls.register { sources = formatters_by_ft.supported }
+end
+
+return M
diff --git a/lua/lvim/lsp/null-ls/init.lua b/lua/lvim/lsp/null-ls/init.lua
new file mode 100644
index 00000000..ef4a1844
--- /dev/null
+++ b/lua/lvim/lsp/null-ls/init.lua
@@ -0,0 +1,38 @@
+local M = {}
+
+local Log = require "lvim.core.log"
+local formatters = require "lvim.lsp.null-ls.formatters"
+local linters = require "lvim.lsp.null-ls.linters"
+
+function M:setup()
+  local status_ok, null_ls = pcall(require, "null-ls")
+  if not status_ok then
+    Log:error "Missing null-ls dependency"
+    return
+  end
+
+  null_ls.config()
+  local default_opts = require("lvim.lsp").get_common_opts()
+
+  if vim.tbl_isempty(lvim.lsp.null_ls.setup or {}) then
+    lvim.lsp.null_ls.setup = default_opts
+  end
+
+  require("lspconfig")["null-ls"].setup(lvim.lsp.null_ls.setup)
+  for filetype, config in pairs(lvim.lang) do
+    if not vim.tbl_isempty(config.formatters) then
+      vim.tbl_map(function(c)
+        c.filetypes = { filetype }
+      end, config.formatters)
+      formatters.setup(config.formatters)
+    end
+    if not vim.tbl_isempty(config.linters) then
+      vim.tbl_map(function(c)
+        c.filetypes = { filetype }
+      end, config.formatters)
+      linters.setup(config.linters)
+    end
+  end
+end
+
+return M
diff --git a/lua/lvim/lsp/null-ls/linters.lua b/lua/lvim/lsp/null-ls/linters.lua
new file mode 100644
index 00000000..1069ac58
--- /dev/null
+++ b/lua/lvim/lsp/null-ls/linters.lua
@@ -0,0 +1,66 @@
+local M = {}
+
+local null_ls = require "null-ls"
+local services = require "lvim.lsp.null-ls.services"
+local Log = require "lvim.core.log"
+
+function M.list_registered_providers(filetype)
+  local null_ls_methods = require "null-ls.methods"
+  local linter_method = null_ls_methods.internal["DIAGNOSTICS"]
+  local registered_providers = services.list_registered_providers_names(filetype)
+  return registered_providers[linter_method] or {}
+end
+
+function M.list_available(filetype)
+  local linters = {}
+  local tbl = require "lvim.utils.table"
+  for _, provider in pairs(null_ls.builtins.diagnostics) do
+    if tbl.contains(provider.filetypes or {}, function(ft)
+      return ft == "*" or ft == filetype
+    end) 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_name = lnt_config.exe:gsub("-", "_")
+    local linter = null_ls.builtins.diagnostics[linter_name]
+
+    if not linter then
+      Log: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
+        Log:warn("Not found: " .. linter._opts.command)
+        errors[lnt_config.exe] = {} -- Add data here when necessary
+      else
+        Log:debug("Using linter: " .. linter_cmd)
+        linters[lnt_config.exe] = linter.with {
+          command = linter_cmd,
+          extra_args = lnt_config.args,
+          filetypes = lnt_config.filetypes,
+        }
+      end
+    end
+  end
+
+  return { supported = linters, unsupported = errors }
+end
+
+function M.setup(linter_configs)
+  if vim.tbl_isempty(linter_configs) then
+    return
+  end
+
+  local linters = M.list_configured(linter_configs)
+  null_ls.register { sources = linters.supported }
+end
+
+return M
diff --git a/lua/lvim/lsp/null-ls/services.lua b/lua/lvim/lsp/null-ls/services.lua
new file mode 100644
index 00000000..9cb29f49
--- /dev/null
+++ b/lua/lvim/lsp/null-ls/services.lua
@@ -0,0 +1,63 @@
+local M = {}
+
+local function find_root_dir()
+  local util = require "lspconfig/util"
+  local lsp_utils = require "lvim.lsp.utils"
+
+  local ts_client = lsp_utils.is_client_active "typescript"
+  if ts_client then
+    return ts_client.config.root_dir
+  end
+  local dirname = vim.fn.expand "%:p:h"
+  return util.root_pattern "package.json"(dirname)
+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 },
+  stylelint = { 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
+
+function M.list_registered_providers_names(filetype)
+  local u = require "null-ls.utils"
+  local c = require "null-ls.config"
+  local registered = {}
+  for method, source in pairs(c.get()._methods) do
+    for name, filetypes in pairs(source) do
+      if u.filetype_matches(filetypes, filetype) then
+        registered[method] = registered[method] or {}
+        table.insert(registered[method], name)
+      end
+    end
+  end
+  return registered
+end
+
+return M