LunarVim/lua/lsp/null-ls/linters.lua

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