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authorTobias Geerinckx-Rice <me@tobias.gr>2020-11-15 19:25:00 +0100
committerTobias Geerinckx-Rice <me@tobias.gr>2020-12-05 16:47:59 +0100
commita81258c12415b9cee52c951b8b53cbe46f27654f (patch)
tree351283a51cc1212f27515bf029218004d15add0e /guix
parent4d0b61a1f6ff99ff1795b876841e84e136b05186 (diff)
ui: Handle multiword and empty $PAGER values.
* guix/ui.scm (call-with-paginated-output-port): Empty PAGER values disable paging. Non-empty ones are split into command arguments. Reported by Daniel Brooks <db48x@db48x.net>.
Diffstat (limited to 'guix')
-rw-r--r--guix/ui.scm47
1 files changed, 28 insertions, 19 deletions
diff --git a/guix/ui.scm b/guix/ui.scm
index 0c2c6a5e97..fce2878354 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -12,7 +12,7 @@
;;; Copyright © 2018 Kyle Meyer <kyle@kyleam.com>
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2019 Chris Marusich <cmmarusich@gmail.com>
-;;; Copyright © 2019 Tobias Geerinckx-Rice <me@tobias.gr>
+;;; Copyright © 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2019 Simon Tournier <zimon.toutoune@gmail.com>
;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
@@ -1664,24 +1664,33 @@ zero means that PACKAGE does not match any of REGEXPS."
(define* (call-with-paginated-output-port proc
#:key (less-options "FrX"))
- (if (isatty?* (current-output-port))
- ;; Set 'LESS' so that 'less' exits if everything fits on the screen (F),
- ;; lets ANSI escapes through (r), does not send the termcap
- ;; initialization string (X). Set it unconditionally because some
- ;; distros set it to something that doesn't work here.
- ;;
- ;; For things that produce long lines, such as 'guix processes', use 'R'
- ;; instead of 'r': this strips hyperlinks but allows 'less' to make a
- ;; good estimate of the line length.
- (let ((pager (with-environment-variables `(("LESS" ,less-options))
- (open-pipe* OPEN_WRITE
- (or (getenv "GUIX_PAGER") (getenv "PAGER")
- "less")))))
- (dynamic-wind
- (const #t)
- (lambda () (proc pager))
- (lambda () (close-pipe pager))))
- (proc (current-output-port))))
+ (let ((pager-command-line (or (getenv "GUIX_PAGER")
+ (getenv "PAGER")
+ "less")))
+ ;; Setting PAGER to the empty string conventionally disables paging.
+ (if (and (not (string-null? pager-command-line))
+ (isatty?* (current-output-port)))
+ ;; Set 'LESS' so that 'less' exits if everything fits on the screen
+ ;; (F), lets ANSI escapes through (r), does not send the termcap
+ ;; initialization string (X). Set it unconditionally because some
+ ;; distros set it to something that doesn't work here.
+ ;;
+ ;; For things that produce long lines, such as 'guix processes', use
+ ;; 'R' instead of 'r': this strips hyperlinks but allows 'less' to
+ ;; make a good estimate of the line length.
+ (let* ((pager (with-environment-variables `(("LESS" ,less-options))
+ (apply open-pipe* OPEN_WRITE
+ ;; Split into arguments. Treat runs of multiple
+ ;; whitespace characters as one. libpipeline-
+ ;; style "cmd one\ arg" escaping is unsupported.
+ (remove (lambda (s) (string-null? s))
+ (string-split pager-command-line
+ char-set:whitespace))))))
+ (dynamic-wind
+ (const #t)
+ (lambda () (proc pager))
+ (lambda () (close-pipe pager))))
+ (proc (current-output-port)))))
(define-syntax with-paginated-output-port
(syntax-rules ()