nixos/config/nvim/lua/config_plugins/config_lsp.lua

-- Set up null_ls first
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.latexindent,
        null_ls.builtins.formatting.trim_whitespace,
        null_ls.builtins.hover.dictionary,
    },
}

-- 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(client, 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,
}

local capabilities = require('cmp_nvim_lsp').default_capabilities()

require('lspconfig')['pyright'].setup{
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}

require('lspconfig')['fortls'].setup {
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities
}

require('lspconfig')['sumneko_lua'].setup {
    settings = {
        Lua = {
            runtime = {
                -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
                version = 'LuaJIT',
            },
            diagnostics = {
                -- Get the language server to recognize the `vim` global
                globals = { 'vim' },
            },
            workspace = {
                -- Make the server aware of Neovim runtime files
                library = vim.api.nvim_get_runtime_file("", true),
            },
            -- Do not send telemetry data containing a randomized but unique identifier
            telemetry = {
                enable = false,
            },
        },
    },
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}

require('lspconfig')['texlab'].setup {
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}