Emacs/Guix: Allow using M-x shell to install profiles.

.emacs.d/lisp/init-guix.el

@@ -126,6 +126,22 @@ If MANIFEST is nil, it is queried from the manifests found in `ambrevar/guix-man
   (first (directory-files ambrevar/guix-channel-spec-directory 'full
                           (concat pattern "-channel"))))
 
+(defun ambrevar/run-in-eshell (command)
+  (let ((eshell-buffer-name "*guix*"))
+      (eshell)
+      (when (eshell-interactive-process)
+        (eshell t))
+      (eshell-interrupt-process)
+      (insert command)
+      (eshell-send-input)))
+
+(defun ambrevar/run-in-shell (command)
+  (shell (generate-new-buffer (generate-new-buffer-name "*guix*")))
+  (goto-char (point-max))
+  (comint-delete-input)
+  (insert command)
+  (comint-send-input))
+
 (defun ambrevar/guix-install-manifest (&optional manifest channel)
   "Install Guix manifest to `ambrevar/guix-extra-profiles'.
 
@@ -138,6 +154,7 @@ If CHANNEL is nil and `ambrevar/guix-always-use-channel-specs' is
 non-nil, then try to use a channel specification file from
 `ambrevar/guix-channel-spec-directory' if any."
   (interactive)
+  (require 'init-eshell)                ; For `ambrevar/prefer-eshell'.
   (let* ((manifest-pair (ambrevar/guix-query-manifest manifest))
          (manifest-name (first manifest-pair))
          (manifest (second manifest-pair))
@@ -159,18 +176,16 @@ non-nil, then try to use a channel specification file from
     (make-directory (expand-file-name manifest-name
                                       ambrevar/guix-extra-profiles)
                     'parents)
-    (let ((eshell-buffer-name "*guix*"))
-      (eshell)
-      (when (eshell-interactive-process)
-        (eshell t))
-      (eshell-interrupt-process)
-      (insert guix " package" (concat " --manifest=" manifest)
-              (if (string= "default" manifest-name)
-                  ""
-                (concat " --profile=" (expand-file-name ambrevar/guix-extra-profiles)
-                        "/" manifest-name
-                        "/" manifest-name)))
-      (eshell-send-input))
+    (funcall (if ambrevar/prefer-eshell
+                 'ambrevar/run-in-eshell
+                 'ambrevar/run-in-shell)
+     (string-join
+      (list guix " package" (concat " --manifest=" manifest)
+            (if (string= "default" manifest-name)
+                ""
+              (concat " --profile=" (expand-file-name ambrevar/guix-extra-profiles)
+                      "/" manifest-name
+                      "/" manifest-name)))))
     (unless channel
       ;; TODO: Only do this when manifest install has succeeded.
       (ambrevar/guix-save-channel-specs