live_grep config to: set glob, toggle case-sensitivity and toggle regex

[hernancerm]

When using the picker live_grep I like having dedicated keymaps to toggle case-sensitivity, regex, and also to set a glob. Below is a short video showing what I mean. This behavior aligns more closely than require("fzf-lua").actions.grep_lgrep to what is offered in most editors.

fzf-lua_live_grep.mp4

Here is the excerpt of my lazy.nvim config used for the video. It's brittle in a way since I'm using non-public code from fzf-lua:

  {
    "ibhagwan/fzf-lua",
    event = "VeryLazy",
    opts = function()
      local utils = require("fzf-lua.utils")
      local actions = require("fzf-lua.actions")
      return {
        defaults = {
          header_separator = " | "
        },
        grep = {
          rg_opts = "--column --line-number --no-heading --color=always"
            .. " --fixed-strings --ignore-case --max-columns=4096 -e",
          formatter = "path.filename_first",
          winopts = {
            backdrop = 100,
            border = "single",
            preview = {
              border = "single",
              title_pos = "left",
              layout = "vertical"
            },
          },
          actions = {
            ["ctrl-g"] = {
              fn = function(_, opts)
                vim.ui.input({ prompt = "Enter glob pattern: " }, function(input)
                  vim.g._fzf_lua_glob_previous = vim.g._fzf_lua_glob_current or input
                  vim.g._fzf_lua_glob_current = input
                end)
                -- It's ok to always remove the previous glob since `utils.toggle_cmd_flag()`
                -- internally does a `gsub` to the empty string ("") when arg `enabled` == false.
                local cmd = utils.toggle_cmd_flag(
                  utils.toggle_cmd_flag(
                    opts._cmd or opts.cmd,
                    "--glob=" .. vim.g._fzf_lua_glob_previous,
                    false),
                  "--glob=" .. vim.g._fzf_lua_glob_current,
                  true)
                -- See function actions.toggle_flag in fzf-lua repo.
                local o = vim.tbl_deep_extend("keep", {
                  cmd = cmd,
                  resume = true
                }, opts.__call_opts)
                opts.__call_fn(o)
              end,
              desc = "set-glob-pattern",
              header = function(o)
                local no_glob = "[] Glob"
                if vim.g._fzf_lua_glob_current == nil then
                  return no_glob
                end
                local flag = "--glob=" .. vim.g._fzf_lua_glob_current
                if o.cmd and o.cmd:match(utils.lua_regex_escape(flag)) then
                  return "[" .. vim.g._fzf_lua_glob_current .. "] Glob"
                else
                  return no_glob
                end
              end
            },
            ["ctrl-r"] = {
              fn = function(_, opts)
                actions.toggle_flag(_, vim.tbl_extend("force", opts, {
                  toggle_flag = "--fixed-strings"
                }))
              end,
              desc = "toggle-fixed-strings",
              header = function(o)
                local flag = "--fixed-strings"
                local cmd = o.cmd or o._cmd
                if cmd and cmd:match(utils.lua_regex_escape(flag)) then
                  return "[ ] Regex"
                else
                  return "[x] Regex"
                end
              end
            },
            ["ctrl-s"] = {
              fn = function(_, opts)
                actions.toggle_flag(_, vim.tbl_extend("force", opts, {
                  toggle_flag = "--ignore-case"
                }))
              end,
              desc = "toggle-ignore-case",
              header = function(o)
                local flag = "--ignore-case"
                local cmd = o.cmd or o._cmd
                if cmd and cmd:match(utils.lua_regex_escape(flag)) then
                  return "[ ] Case-sensitive"
                else
                  return "[x] Case-sensitive"
                end
              end
            }
          }
        }
      }
    end
  },

---

Changelog:

1. Nov 15th, 2025: Use o._cmd when o.cmd is nil. Fixes incorrect checkboxes at start for Regex and Case-sensitive.

[ibhagwan]

Looks great, ty for sharing @hernancerm!!