>From 81d7ada26c30effede23926fb85b2b8ed59778af Mon Sep 17 00:00:00 2001
From: Steve Sprang <scs@stevesprang.com>
Date: Tue, 9 Jan 2018 14:10:04 -0800
Subject: [PATCH 2/4] package: Improve output appearance when listing packages.

* guix/scripts/package.scm (process-query): Use pretty-print-table when
listing installed and available packages.

Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
---
 guix/scripts/package.scm | 37 ++++++++++++++++++-------------------
 1 file changed, 18 insertions(+), 19 deletions(-)

diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index 694959d326..a34ecdcb54 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -9,6 +9,7 @@
 ;;; Copyright © 2019 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2020 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2020 Simon Tournier <zimon.toutoune@gmail.com>
+;;; Copyright © 2018 Steve Sprang <scs@stevesprang.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -831,15 +832,14 @@ processed, #f otherwise."
                           (map profile-manifest profiles)))
               (installed (manifest-entries manifest)))
          (leave-on-EPIPE
-          (for-each (match-lambda
-                      (($ <manifest-entry> name version output path _)
-                       (when (or (not regexp)
-                                 (regexp-exec regexp name))
-                         (format #t "~a\t~a\t~a\t~a~%"
-                                 name (or version "?") output path))))
-
-                    ;; Show most recently installed packages last.
-                    (reverse installed))))
+          (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)))))
        #t)
 
       (('list-available regexp)
@@ -862,16 +862,15 @@ processed, #f otherwise."
                                 result))
                           '())))
          (leave-on-EPIPE
-          (for-each (match-lambda
-                      ((name version outputs location)
-                       (format #t "~a\t~a\t~a\t~a~%"
-                               name version
-                               (string-join outputs ",")
-                               (location->string location))))
-                    (sort available
-                          (match-lambda*
-                            (((name1 . _) (name2 . _))
-                             (string<? name1 name2))))))
+          (let ((rows (map (match-lambda
+                             ((name version outputs location)
+                              (list name version (string-join outputs ",")
+                                    (location->string location))))
+                           (sort available
+                                 (match-lambda*
+                                   (((name1 . _) (name2 . _))
+                                    (string<? name1 name2)))))))
+            (pretty-print-table rows)))
          #t))
 
       (('list-profiles _)
-- 
2.32.0