dotfiles/.config/nvim/after/plugin/lsp.lua

local Remap = require("halfdan.keymap")
local nnoremap = Remap.nnoremap
local inoremap = Remap.inoremap

vim.fn.sign_define("DiagnosticSignError",  {text = "", texthl = "DiagnosticSignError"})
vim.fn.sign_define("DiagnosticSignWarn",   {text = "", texthl = "DiagnosticSignWarn"})
vim.fn.sign_define("DiagnosticSignInfo",   {text = "", texthl = "DiagnosticSignInfo"})
vim.fn.sign_define("DiagnosticSignHint",   {text = "", texthl = "DiagnosticSignHint"})

-- Set Default Prefix.
-- Note: You can set a prefix per lsp server in the lv-globals.lua file
vim.lsp.handlers["textDocument/publishDiagnostics"] = vim.lsp.with(
  vim.lsp.diagnostic.on_publish_diagnostics, {
    -- virtual_text = {
    --   prefix = "",
    --   spacing = 1,
    -- },
    signs = true,
    underline = true,
  }
)

-- Setup for nvim-notify
vim.lsp.set_log_level(2)

local convert_lsp_log_level_to_neovim_log_level = function(lsp_log_level)
  if lsp_log_level == 1 then
    return 4
  elseif lsp_log_level == 2 then
    return 3
  elseif lsp_log_level == 3 then
    return 2
  elseif lsp_log_level == 4 then
    return 1
  end
end

local levels = {
  "ERROR",
  "WARN",
  "INFO",
  "DEBUG",
  [0] = "TRACE",
}
vim.lsp.handlers["window/showMessage"] = function(_, result, ...)
  if require("vim.lsp.log").should_log(convert_lsp_log_level_to_neovim_log_level(result.type)) then
    vim.notify(result.message, levels[result.type])
  end
end

-- symbols for autocomplete
vim.lsp.protocol.CompletionItemKind = {
    "   (Text) ",
    "   (Method)",
    "   (Function)",
    "   (Constructor)",
    " ﴲ  (Field)",
    "[] (Variable)",
    "   (Class)",
    " ﰮ  (Interface)",
    "   (Module)",
    " 襁 (Property)",
    "   (Unit)",
    "   (Value)",
    " 練 (Enum)",
    "   (Keyword)",
    "   (Snippet)",
    "   (Color)",
    "   (File)",
    "   (Reference)",
    "   (Folder)",
    "   (EnumMember)",
    " ﲀ  (Constant)",
    " ﳤ  (Struct)",
    "   (Event)",
    "   (Operator)",
    "   (TypeParameter)"
}

local function documentHighlight(client, bufnr)
    -- Set autocommands conditional on server_capabilities
    if client.resolved_capabilities.document_highlight then
        vim.api.nvim_exec(
            [[
      hi LspReferenceRead cterm=bold ctermbg=red guibg=#464646
      hi LspReferenceText cterm=bold ctermbg=red guibg=#464646
      hi LspReferenceWrite cterm=bold ctermbg=red guibg=#464646
      augroup lsp_document_highlight
        autocmd! * <buffer>
        autocmd CursorHold <buffer> lua vim.lsp.buf.document_highlight()
        autocmd CursorMoved <buffer> lua vim.lsp.buf.clear_references()
      augroup END
    ]],
            false
        )
    end
end

-- -- needed for the LSP to recognize elixir files (alternativly just use elixir-editors/vim-elixir)
-- vim.cmd([[
--   au BufRead,BufNewFile *.ex,*.exs set filetype=elixir
--   au BufRead,BufNewFile *.eex,*.leex,*.sface set filetype=eelixir
--   au BufRead,BufNewFile mix.lock set filetype=elixir
-- ]])



-- Diagnostic keymaps
vim.api.nvim_set_keymap('n', '<leader>e', '<cmd>lua vim.diagnostic.open_float()<CR>', { noremap = true, silent = true })
vim.api.nvim_set_keymap('n', '<leader>q', '<cmd>lua vim.diagnostic.setloclist()<CR>', { noremap = true, silent = true })

-- LSP settings
local lsp_status = require('lsp-status')
lsp_status.register_progress()

local lspconfig = require 'lspconfig'

local on_attach = function(client, bufnr)
  nnoremap("gd", function() vim.lsp.buf.definition() end)
  nnoremap("gD", function() vim.lsp.buf.declaration() end)
  nnoremap("K", function() vim.lsp.buf.hover() end)
  nnoremap("gW", function() vim.lsp.buf.workspace_symbol() end)
  nnoremap("<leader>vd", function() vim.diagnostic.open_float() end)
  nnoremap("[d", function() vim.diagnostic.goto_next() end)
  nnoremap("]d", function() vim.diagnostic.goto_prev() end)
  nnoremap("<leader>ca", function() vim.lsp.buf.code_action() end)
  nnoremap("gr", function() vim.lsp.buf.references() end)
  nnoremap("<leader>rn", function() vim.lsp.buf.rename() end)
  nnoremap("<leader>cl", function() vim.lsp.codelens.run() end)
  nnoremap("<leader>fa", function() vim.lsp.buf.format{async = true} end)
  inoremap("<C-h>", function() vim.lsp.buf.signature_help() end)

  lsp_status.on_attach(client, bufnr)
end

local function config(_config)
  _config = vim.tbl_deep_extend("force", {
    log_level = vim.lsp.protocol.MessageType.Log,
    message_level = vim.lsp.protocol.MessageType.Log,
    capabilities = require("cmp_nvim_lsp").default_capabilities(vim.lsp.protocol.make_client_capabilities()),
    on_attach = on_attach,
  }, _config or {})

  -- Set default client capabilities plus window/workDoneProgress
  _config.capabilities = vim.tbl_extend('keep', _config.capabilities or {}, lsp_status.capabilities)

  return _config
end

local elixir = require('elixir')
elixir.setup(config({
  -- repo = "mhanberg/elixir-ls", -- defaults to elixir-lsp/elixir-ls
  -- branch = "mh/all-workspace-symbols", -- defaults to nil, just checkouts out the default branch, mutually exclusive with the `tag` option
  cmd = {"/usr/local/opt/elixir-ls/rel/language_server.sh"},
  settings = elixir.settings({
    dialyzerEnabled = true,
    fetchDeps = false,
    enableTestLenses = true,
    suggestSpecs = false,
  }),
  on_attach = function(client, bufnr)
    on_attach(client, bufnr)

    local map_opts = { buffer = true, noremap = true}

    -- remove the pipe operator
    vim.keymap.set("n", "<leader>fp", ":ElixirFromPipe<cr>", map_opts)
    -- add the pipe operator
    vim.keymap.set("n", "<leader>tp", ":ElixirToPipe<cr>", map_opts)
    vim.keymap.set("v", "<leader>em", ":ElixirExpandMacro<cr>", map_opts)
  end
}))

-- Enable the following language servers
local servers = { 'gopls', 'julials', 'rust_analyzer', 'pyright' }
for _, lsp in ipairs(servers) do
  lspconfig[lsp].setup(config())
end

lspconfig.sumneko_lua.setup(config({
  settings = {
    Lua = {
      diagnostics = {
        globals = { 'vim' }
      }
    }
  }
}))

-- Generic language server. Used to run credo
lspconfig.efm.setup(config({
  on_attach = on_attach,
  filetypes = {"elixir"}
}))

require('rust-tools').setup({
    tools = {
        inlay_hints = {
            parameter_hints_prefix = "← ",
            other_hints_prefix = "➜ ",
        }
    }
})