[question] How to disable TAB and S-TAB?

[jabbalaci]

I have a snippet like this:

snippet for
	for (${2:i} = 0; $2 < ${1:count}; $2${3:++}) {
		${4}
	}

After inserting a snippet, in insert mode I use TAB to insert 4 spaces. However, TAB means jump in LuaSnip. I added jumps to different hotkeys. Here is my config:

return {
  'L3MON4D3/LuaSnip',
  lazy = true,
  config = function()
    require('luasnip').setup {
      -- Your luasnip config here
    }
    -- for snipmate format:
    require('luasnip.loaders.from_snipmate').lazy_load()
  end,
  keys = {
    {
      '<C-h>',
      function()
        require('luasnip').jump(-1)
      end,
      mode = { 'i', 's' },
    },
    {
      '<C-l>',
      function()
        require('luasnip').jump(1)
      end,
      mode = { 'i', 's' },
    },
  },
}

But it leaves TAB and S-TAB still activated. I don't need them. How could I disable them completely? C-h and C-l are enough for me, and then I could use TAB in insert mode for indenting. Thanks.

[leiserfg]

We don't add any mappings automatically, maybe you are using a neovim distribution that is doing it for you (lazy-vim or something like it)?

[jabbalaci]

@leiserfg : Thanks, you are right. It's saghen/blink.cmp that adds this behaviour.

[jabbalaci]

I could solve the problem. Here is my config for saghen/blink.cmp:

return {
  -- Autocompletion
  -- https://github.com/Saghen/blink.cmp
  -- https://cmp.saghen.dev/
  'saghen/blink.cmp',
  event = 'VimEnter',
  version = '1.*',
  dependencies = {
    -- Snippet Engine
    {
      'L3MON4D3/LuaSnip',
      version = '2.*',
      build = (function()
        -- Build Step is needed for regex support in snippets.
        -- This step is not supported in many windows environments.
        -- Remove the below condition to re-enable on windows.
        if vim.fn.has 'win32' == 1 or vim.fn.executable 'make' == 0 then
          return
        end
        return 'make install_jsregexp'
      end)(),
      dependencies = {
        -- `friendly-snippets` contains a variety of premade snippets.
        --    See the README about individual language/framework/plugin snippets:
        --    https://github.com/rafamadriz/friendly-snippets
        -- {
        --   'rafamadriz/friendly-snippets',
        --   config = function()
        --     require('luasnip.loaders.from_vscode').lazy_load()
        --   end,
        -- },
      },
      opts = {},
    },
    'folke/lazydev.nvim',
  },
  --- @module 'blink.cmp'
  --- @type blink.cmp.Config
  opts = {
    keymap = {
      -- 'default' (recommended) for mappings similar to built-in completions
      --   <c-y> to accept ([y]es) the completion.
      --    This will auto-import if your LSP supports it.
      --    This will expand snippets if the LSP sent a snippet.
      -- 'super-tab' for tab to accept
      -- 'enter' for enter to accept
      -- 'none' for no mappings
      --
      -- For an understanding of why the 'default' preset is recommended,
      -- you will need to read `:help ins-completion`
      --
      -- No, but seriously. Please read `:help ins-completion`, it is really good!
      --
      -- All presets have the following mappings:
      -- <tab>/<s-tab>: move to right/left of your snippet expansion
      -- <c-space>: Open menu or open docs if already open
      -- <c-n>/<c-p> or <up>/<down>: Select next/previous item
      -- <c-e>: Hide menu
      -- <c-k>: Toggle signature help
      --
      -- See :h blink-cmp-config-keymap for defining your own keymap
      -- preset = 'default',
      preset = 'super-tab',

      -- overwrite <Tab> and <S-Tab>
      ['<Tab>'] = {
        function(cmp)
          if cmp.snippet_active() then
            return cmp.accept()
          else
            return cmp.select_and_accept()
          end
        end,
        -- 'snippet_forward',
        'fallback',
      },
      ['<S-Tab>'] = {
        -- 'snippet_backward',
        'fallback',
      },

      -- cancel selection: <C-e>

      -- For more advanced Luasnip keymaps (e.g. selecting choice nodes, expansion) see:
      --    https://github.com/L3MON4D3/LuaSnip?tab=readme-ov-file#keymaps
    },

    appearance = {
      -- 'mono' (default) for 'Nerd Font Mono' or 'normal' for 'Nerd Font'
      -- Adjusts spacing to ensure icons are aligned
      nerd_font_variant = 'mono',
    },

    completion = {
      -- By default, you may press `<c-space>` to show the documentation.
      -- Optionally, set `auto_show = true` to show the documentation after a delay.
      documentation = { auto_show = false, auto_show_delay_ms = 500 },

      -- https://cmp.saghen.dev/configuration/completion.html#menu
      menu = {
        draw = {
          columns = { -- possible values: source_name, source_id, label, kind_icon, kind, label_description
            { 'kind_icon' },
            { 'label' },
            { 'kind' },
            { 'label_description' },
          },
        },
      },
      -- https://cmp.saghen.dev/configuration/reference.html#completion-ghost-text
      -- ghost_text = { enabled = true },
    },

    sources = {
      default = { 'lsp', 'path', 'snippets', 'lazydev', 'buffer' },
      providers = {
        lazydev = { module = 'lazydev.integrations.blink', score_offset = 100 },
      },
    },

    snippets = { preset = 'luasnip' },

    -- Blink.cmp includes an optional, recommended rust fuzzy matcher,
    -- which automatically downloads a prebuilt binary when enabled.
    --
    -- By default, we use the Lua implementation instead, but you may enable
    -- the rust implementation via `'prefer_rust_with_warning'`
    --
    -- See :h blink-cmp-config-fuzzy for more information
    fuzzy = { implementation = 'lua' },

    -- Shows a signature help window while you type arguments for a function
    signature = { enabled = true },
  },
}

This is the important part:

preset = 'super-tab',

      -- overwrite <Tab> and <S-Tab>
      ['<Tab>'] = {
        function(cmp)
          if cmp.snippet_active() then
            return cmp.accept()
          else
            return cmp.select_and_accept()
          end
        end,
        -- 'snippet_forward',
        'fallback',
      },
      ['<S-Tab>'] = {
        -- 'snippet_backward',
        'fallback',
      },

The super-tab preset is good for me but I didn't like how Tab and S-Tab behaved. But I can overwrite them here. In blink.cmp-main/lua/blink/cmp/keymap/presets.lua you can find the source code for these two hotkeys. I copied them here and put 'snippet_forward' and 'snippet_backward', in comment.