neovim: Fix telescope's config

hm-modules/common/neovim/plugins/telescope.nix

@@ -1,34 +1,48 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, nixpkgs-channel, pkgs, ... }:
 
 let
   cfg = config.modules.neovim;
   cfg-plug = config.programs.nixvim.plugins;
+
+  keymaps = {
+    "<leader>ff" = { action = "find_files"; options.desc = "Telescope: Find files"; };
+    "<leader>fg" = { action = "live_grep";  options.desc = "Telescope: Live grep";  };
+    "<leader>fb" = { action = "buffers";    options.desc = "Telescope: Buffers";    };
+    "<leader>fh" = { action = "help_tags";  options.desc = "Telescope: Help tags";  };
+  };
+
+  settings = {
+    # FIXME: Use mkRaw helper once I figure out how to get helpers working
+    defaults.vimgrep_arguments.__raw = /* lua */ ''
+      (function()
+        local telescopeConfig = require("telescope.config")
+        local vimgrep_arguments = { unpack(telescopeConfig.values.vimgrep_arguments) }
+        table.insert(vimgrep_arguments, "--hidden")
+        table.insert(vimgrep_arguments, "--glob")
+        table.insert(vimgrep_arguments, "!**/.git/*")
+        return vimgrep_arguments
+      end)()
+    '';
+
+    pickers.find_files.find_command = [ "rg" "--files" "--hidden" "--glob" "!**/.git/*" ];
+  };
 in
 lib.mkIf cfg.enable {
   programs.nixvim = {
-    extraPackages = lib.optional cfg-plug.telescope.enable pkgs.fd;
+    extraPackages = lib.optionals cfg-plug.telescope.enable [ pkgs.fd pkgs.ripgrep ];
 
     plugins.telescope = {
-      keymaps = {
-        "<leader>ff" = { action = "find_files"; desc = "Telescope: Find files"; };
-        "<leader>fg" = { action = "live_grep";  desc = "Telescope: Live grep"; };
-        "<leader>fb" = { action = "buffers";    desc = "Telescope: Buffers"; };
-        "<leader>fh" = { action = "help_tags";  desc = "Telescope: Help tags"; };
-      };
-
-      # FIXME: Use mkRaw helper once I figure out how to get helpers working
-      defaults.vimgrep_arguments.__raw = /* lua */ ''
-        (function()
-          local telescopeConfig = require("telescope.config")
-          local vimgrep_arguments = { unpack(telescopeConfig.values.vimgrep_arguments) }
-          table.insert(vimgrep_arguments, "--hidden")
-          table.insert(vimgrep_arguments, "--glob")
-          table.insert(vimgrep_arguments, "!**/.git/*")
-          return vimgrep_arguments
-        end)()
-      '';
-
-      extraOptions.pickers.find_files.find_command = [ "rg" "--files" "--hidden" "--glob" "!**/.git/*" ];
-    };
+      keymaps = lib.mapAttrs
+        (_: value:
+          if nixpkgs-channel == "stable" then
+            { inherit (value) action; } // value.options
+          else
+            value
+        )
+        keymaps;
+      } // (if nixpkgs-channel == "stable" then {
+        inherit (settings) defaults;
+        extraOptions = { inherit (settings) pickers; };
+      } else { inherit settings; });
   };
 }