diff options
Diffstat (limited to 'guix/ui.scm')
| -rw-r--r-- | guix/ui.scm | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/guix/ui.scm b/guix/ui.scm index cb68a07c6c..a7acd41440 100644 --- a/guix/ui.scm +++ b/guix/ui.scm @@ -17,6 +17,7 @@ ;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net> ;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com> ;;; Copyright © 2018 Steve Sprang <scs@stevesprang.com> +;;; Copyright © 2022 Taiju HIGASHI <higashi@taiju.info> ;;; ;;; This file is part of GNU Guix. ;;; @@ -1672,11 +1673,18 @@ return the underlying port. Otherwise return #f." (_ #f))) +(define (find-available-pager) + "Return the program name of an available pager or the empty string if none is +available." + (or (getenv "GUIX_PAGER") + (getenv "PAGER") + (which "less") + (which "more") + "")) + (define* (call-with-paginated-output-port proc #:key (less-options "FrX")) - (let ((pager-command-line (or (getenv "GUIX_PAGER") - (getenv "PAGER") - "less"))) + (let ((pager-command-line (find-available-pager))) ;; Setting PAGER to the empty string conventionally disables paging. (if (and (not (string-null? pager-command-line)) (isatty?* (current-output-port))) |