nixos/config/nvim/lua/lsp/init.lua

-- Mappings.
-- See `:help vim.diagnostic.*` for documentation on any of the below functions
local opts = { noremap = true, silent = true }
vim.keymap.set("n", "<leader>e", vim.diagnostic.open_float, opts)
vim.keymap.set("n", "[d", vim.diagnostic.goto_prev, opts)
vim.keymap.set("n", "]d", vim.diagnostic.goto_next, opts)
vim.keymap.set("n", "<leader>q", vim.diagnostic.setloclist, opts)

local signs = { Error = " ", Warn = " ", Hint = " ", Info = " " }
for type, icon in pairs(signs) do
    local hl = "DiagnosticSign" .. type
    vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = hl })
end

local lsp_formatting = function(bufnr)
    vim.lsp.buf.format {
        filter = function(client) return client.name == "null-ls" end,
        bufnr = bufnr,
        timeout_ms = 2000,
        -- async = true,
    }
end

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
local on_attach = function(_, bufnr)
    -- Mappings.
    -- See `:help vim.lsp.*` for documentation on any of the below functions
    local bufopts = { noremap = true, silent = true, buffer = bufnr }
    vim.keymap.set("n", "gD", vim.lsp.buf.definition, bufopts)
    vim.keymap.set("n", "gd", "<cmd>Trouble lsp_definitions<cr>", bufopts)
    vim.keymap.set("n", "gR", vim.lsp.buf.references, bufopts)
    vim.keymap.set("n", "gr", "<cmd>Trouble lsp_references<cr>", bufopts)
    vim.keymap.set("n", "gI", vim.lsp.buf.implementation, bufopts)
    vim.keymap.set("n", "gi", "<cmd>Trouble lsp_implementations<cr>", bufopts)
    vim.keymap.set("n", "K", vim.lsp.buf.hover, bufopts)
    vim.keymap.set("n", "<C-k>", vim.lsp.buf.signature_help, bufopts)
    vim.keymap.set("n", "<leader>wa", vim.lsp.buf.add_workspace_folder, bufopts)
    vim.keymap.set("n", "<leader>wr", vim.lsp.buf.remove_workspace_folder, bufopts)
    vim.keymap.set("n", "<leader>wl", function() print(vim.inspect(vim.lsp.buf.list_workspace_folders())) end, bufopts)
    vim.keymap.set("n", "<leader>D", vim.lsp.buf.type_definition, bufopts)
    vim.keymap.set("n", "<leader>rn", vim.lsp.buf.rename, bufopts)
    vim.keymap.set("n", "<leader>ca", vim.lsp.buf.code_action, bufopts)
    vim.keymap.set("n", "<leader>i", lsp_formatting, bufopts)
end

local lsp_flags = {
    -- This is the default in Nvim 0.7+
    debounce_text_changes = 150,
}

require("neodev").setup()

local lspconfig = require "lspconfig"
local capabilities = require("cmp_nvim_lsp").default_capabilities()

lspconfig.pyright.setup {
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}

lspconfig.fortls.setup {
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}

lspconfig.lua_ls.setup {
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}

lspconfig.texlab.setup {
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}

local null_ls = require "null-ls"
null_ls.setup {
    sources = {
        null_ls.builtins.code_actions.gitsigns,
        null_ls.builtins.diagnostics.mypy,
        null_ls.builtins.diagnostics.zsh,
        null_ls.builtins.formatting.black,
        null_ls.builtins.formatting.isort,
        null_ls.builtins.formatting.trim_whitespace,
        null_ls.builtins.formatting.stylua,
        null_ls.builtins.formatting.shfmt,
        null_ls.builtins.formatting.prettier,
        null_ls.builtins.hover.dictionary,
    },
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}