dotfiles/.config/nvim/lua/plugins/lspconfig.lua

local mason_lspconfig = require "mason-lspconfig"
local lspconfig = require "lspconfig"

mason_lspconfig.setup({
    automatic_installation = false
})



-- 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)
    -- Enable completion triggered by <c-x><c-o>
    vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

    -- Mappings.
    -- See `:help vim.lsp.*` for documentation on any of the below functions
    local opts = { noremap = true, silent = true }
    local bufopts = { noremap = true, silent = true, buffer = bufnr }
    vim.keymap.set('n', '<space>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', '<space>q', vim.diagnostic.setloclist, opts)
    vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
    vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
    vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
    vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
    vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)
    vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder, bufopts)
    vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, bufopts)
    vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, bufopts)
    vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, bufopts)
    vim.keymap.set('n', '<space>ca', vim.lsp.buf.code_action, bufopts)
    vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
    vim.keymap.set('n', '<space>ge', function() vim.diagnostic.goto_next() end, bufopts)
    vim.keymap.set('n', '<space>gE', function() vim.diagnostic.goto_prev() end, bufopts)
    vim.keymap.set('n', '<space>fo', function() vim.lsp.buf.format { async = true } end, bufopts)
    vim.keymap.set('n', '<space>wl', function()
        print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
    end, bufopts)
end

-- ADD NVIM CMP AS A CAPABILITY
local lsp_defaults = lspconfig.util.default_config
local capabilities = vim.tbl_deep_extend(
    'force',
    lsp_defaults.capabilities,
    require('cmp_nvim_lsp').default_capabilities()
)

mason_lspconfig.setup_handlers {

    -- This is a default handler that will be called for each installed server (also for new servers that are installed during a session)
    function(server_name)
        lspconfig[server_name].setup {
            on_attach = on_attach,
            flags = lsp_flags,
            capabilities = capabilities,
        }
    end,
}

lspconfig["ocamllsp"].setup {
    on_attach = on_attach,
    flags = lsp_flags,
    capabilities = capabilities,
}

vim.g.rustaceanvim = {
    server = {
        on_attach = on_attach,
        flags = lsp_flags,
        capabilities = capabilities
    },
}