[bug#56428] [PATCH] home: Add -I, --list-installed option.

[Antero Mejr]

* guix/scripts/package.scm (list-installed): New procedure.
* guix/scripts/home.scm: Use it.
---
Remove extra (reverse...) from last patch.

 guix/scripts/home.scm    | 12 ++++++++++++
 guix/scripts/package.scm | 30 +++++++++++++++++-------------
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/guix/scripts/home.scm b/guix/scripts/home.scm
index 0f5c3388a1..b0b8412d8c 100644
--- a/guix/scripts/home.scm
+++ b/guix/scripts/home.scm
@@ -4,6 +4,7 @@
 ;;; Copyright © 2021 Pierre Langlois <pierre.langlois@gmx.com>
 ;;; Copyright © 2021 Oleg Pykhalov <go.wigust@gmail.com>
 ;;; Copyright © 2022 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2022 Antero Mejr <antero@mailbox.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -143,6 +144,10 @@ (define (show-help)
                          use BACKEND for 'extension-graph' and 
'shepherd-graph'"))
   (newline)
   (display (G_ "
+  -I, --list-installed[=REGEXP]
+                         list installed packages matching REGEXP"))
+  (newline)
+  (display (G_ "
   -h, --help             display this help and exit"))
   (display (G_ "
   -V, --version          display version information and exit"))
@@ -183,6 +188,13 @@ (define %options
          (option '("graph-backend") #t #f
                  (lambda (opt name arg result)
                    (alist-cons 'graph-backend arg result)))
+         (option '(#\I "list-installed") #f #t
+                 (lambda (opt name arg result)
+                   (pretty-print-table
+                    (list-installed (or arg "")
+                                    (list
+                                     (string-append %guix-home "/profile"))))
+                   (exit 0)))
 
          ;; Container options.
          (option '(#\N "network") #f #f
diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index 99a6cfaa29..02e91a0ee1 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -11,6 +11,7 @@
 ;;; Copyright © 2020 Simon Tournier <zimon.toutoune@gmail.com>
 ;;; Copyright © 2018 Steve Sprang <scs@stevesprang.com>
 ;;; Copyright © 2022 Josselin Poiret <dev@jpoiret.xyz>
+;;; Copyright © 2022 Antero Mejr <antero@mailbox.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -773,6 +774,20 @@ (define absolute
 
   (add-indirect-root store absolute))
 
+(define-public (list-installed regexp profiles)
+  (let* ((regexp    (and regexp (make-regexp* regexp regexp/icase)))
+         (manifest  (concatenate-manifests
+                     (map profile-manifest profiles)))
+         (installed (manifest-entries manifest)))
+    (leave-on-EPIPE
+     (let ((rows (filter-map
+                  (match-lambda
+                    (($ <manifest-entry> name version output path _)
+                     (and (regexp-exec regexp name)
+                          (list name (or version "?") output path))))
+                  installed)))
+       rows))))
+
 
 ;;;
 ;;; Queries and actions.
@@ -824,19 +839,8 @@ (define (diff-profiles profile numbers)
        #t)
 
       (('list-installed regexp)
-       (let* ((regexp    (and regexp (make-regexp* regexp regexp/icase)))
-              (manifest  (concatenate-manifests
-                          (map profile-manifest profiles)))
-              (installed (manifest-entries manifest)))
-         (leave-on-EPIPE
-          (let ((rows (filter-map
-                       (match-lambda
-                         (($ <manifest-entry> name version output path _)
-                          (and (regexp-exec regexp name)
-                               (list name (or version "?") output path))))
-                       installed)))
-            ;; Show most recently installed packages last.
-            (pretty-print-table (reverse rows)))))
+       ;; Show most recently installed packages last.
+       (pretty-print-table (reverse (list-installed regexp profiles)))
        #t)
 
       (('list-available regexp)
-- 
2.36.1