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

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

-- TODO figure out why this don't work
vim.fn.sign_define(
    "LspDiagnosticsSignError",
    {texthl = "LspDiagnosticsSignError", text = "", numhl = "LspDiagnosticsSignError"}
)
vim.fn.sign_define(
    "LspDiagnosticsSignWarning",
    {texthl = "LspDiagnosticsSignWarning", text = "", numhl = "LspDiagnosticsSignWarning"}
)
vim.fn.sign_define(
    "LspDiagnosticsSignHint",
    {texthl = "LspDiagnosticsSignHint", text = "", numhl = "LspDiagnosticsSignHint"}
)
vim.fn.sign_define(
    "LspDiagnosticsSignInformation",
    {texthl = "LspDiagnosticsSignInformation", text = "", numhl = "LspDiagnosticsSignInformation"}
)

-- 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,
  }
)

local saga = require 'lspsaga'
saga.init_lsp_saga({
  -- symbols in winbar
  symbol_in_winbar = true,
  winbar_file_format = function() 
      return vim.fn.expand("%=%m %f")
  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 lspconfig = require 'lspconfig'
local function config(_config)
	return vim.tbl_deep_extend("force", {
		capabilities = require("cmp_nvim_lsp").update_capabilities(vim.lsp.protocol.make_client_capabilities()),
		on_attach = function()
      -- local opts = { noremap = true, silent = true }
      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("<leader>vws", 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>vca", function() vim.lsp.buf.code_action() end)
      nnoremap("<leader>vrr", function() vim.lsp.buf.references() end)
      nnoremap("<leader>vrn", function() vim.lsp.buf.rename() end)
      inoremap("<C-h>", function() vim.lsp.buf.signature_help() end)
      --vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
      -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
      -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
      -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
      -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
      -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
      -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
      -- vim.api.nvim_buf_set_keymap(bufnr, 'n', '<leader>so', [[<cmd>lua require('telescope.builtin').lsp_document_symbols()<CR>]], opts)
      -- vim.cmd [[ command! Format execute 'lua vim.lsp.buf.formatting()' ]]
		end,
	}, _config or {})
end

lspconfig['elixirls'].setup{config({
  cmd = { "/Users/fbecker18/opt/elixir-ls/language_server.sh"}
})}

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

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

--vim.cmd([[
    --augroup
        --autocmd!
        --autocmd BufWritePre *.go lua vim.lsp.buf.formatting_sync(nil, 100)
        --autocmd BufWritePre *.rs lua vim.lsp.buf.formatting_sync(nil, 100)
        --autocmd BufWritePre *.ex,*.exs lua vim.lsp.buf.formatting_sync(nil, 100)
        --autocmd BufWritePre *.py lua vim.lsp.buf.formatting_sync(nil, 100)
    --augroup END
--]])