dev: shell.nix: add emacs 29, 30.0.50, & CI versions

And default to 29.1 (the new stable release of Emacs).

Author: hlissner

shell.nix

@@ -18,11 +18,15 @@
 #   nix-shell --argstr emacs 27.2      # 27.2
 #   nix-shell --argstr emacs 28.1      # 28.1
 #   nix-shell --argstr emacs 28.2      # 28.2
-#   nix-shell --argstr emacs head      # 29.0.50
+#   nix-shell --argstr emacs 29.1      # 29.1
+#   nix-shell --argstr emacs head      # 30.0.50
 #   nix-shell --argstr emacs ci-26.3   # 26.3    (barebones; no GUI)
 #   nix-shell --argstr emacs ci-27.1   # 27.1    (barebones; no GUI)
 #   nix-shell --argstr emacs ci-27.2   # 27.2    (barebones; no GUI)
-#   nix-shell --argstr emacs ci-HEAD   # 29.0.50 (barebones; no GUI)
+#   nix-shell --argstr emacs ci-28.1   # 28.1    (barebones; no GUI)
+#   nix-shell --argstr emacs ci-28.2   # 28.2    (barebones; no GUI)
+#   nix-shell --argstr emacs ci-29.1   # 29.1    (barebones; no GUI)
+#   nix-shell --argstr emacs ci-HEAD   # 30.0.50 (barebones; no GUI)
 
 { pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/22.05.tar.gz")
   {
@@ -37,10 +41,11 @@
         emacs27-1 = (import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/11264a390b197b80edeffac6f20e582f3ea318bd.tar.gz") {}).emacs;
         emacs27-2 = (import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/4c87cb87a2db6b9eb43541c1cf83f2a2f725fa25.tar.gz") {}).emacs;
         emacs28-1 = (import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/54e795706d9fa90004ed1274af639a717f04a2aa.tar.gz") {}).emacs;
+        emacs29-1 = (import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/c434383f2a4866a7c674019b4cdcbfc55db3c4ab.tar.gz") {}).emacs29;
       })
     ];
   }
-, emacs ? "28.2"
+, emacs ? "29.1"
 , emacsdir ? "$(pwd)"
 , doomdir ? ""
 , doomlocaldir ? "$EMACSDIR/.local" }:
@@ -50,12 +55,14 @@ let emacsPkg = (if      emacs == "26.3"     then pkgs.emacs26
                 else if emacs == "27.2"     then pkgs.emacs27-2
                 else if emacs == "28.1"     then pkgs.emacs28-1
                 else if emacs == "28.2"     then pkgs.emacs
+                else if emacs == "29.1"     then pkgs.emacs29-1
                 else if emacs == "head"     then pkgs.emacsGit
                 else if emacs == "ci-26.3"  then pkgs.emacs-26-3
                 else if emacs == "ci-27.1"  then pkgs.emacs-27-1
                 else if emacs == "ci-27.2"  then pkgs.emacs-27-2
                 else if emacs == "ci-28.1"  then pkgs.emacs-28-1
                 else if emacs == "ci-28.2"  then pkgs.emacs-28-2
+                else if emacs == "ci-29.1"  then pkgs.emacs-29-1
                 else if emacs == "ci-head"  then pkgs.emacs-snapshot
                 else pkgs.emacs);
 in pkgs.stdenv.mkDerivation {