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authorLudovic Courtès <ludo@gnu.org>2019-06-25 23:05:00 +0200
committerLudovic Courtès <ludo@gnu.org>2019-06-27 11:14:40 +0200
commit4593f5a654b4e59c5025cc4f99914e24e82515a4 (patch)
tree58e5584c28d45650c99cd60a015c339d7e53b6d3 /guix/build/syscalls.scm
parent8874faaaac665100a095ef25e39c9a389f5a397f (diff)
syscalls: Add 'terminal-rows'.
* guix/build/syscalls.scm (terminal-dimension): New procedure. (terminal-columns): Rewrite in terms of 'terminal-dimension'. (terminal-rows): New procedure. * tests/syscalls.scm ("terminal-rows"): New test.
Diffstat (limited to 'guix/build/syscalls.scm')
-rw-r--r--guix/build/syscalls.scm37
1 files changed, 25 insertions, 12 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 5c2eb3c14d..eb045cbd1c 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -146,6 +146,7 @@
window-size-y-pixels
terminal-window-size
terminal-columns
+ terminal-rows
utmpx?
utmpx-login-type
@@ -1871,23 +1872,17 @@ corresponds to the TIOCGWINSZ ioctl."
(list (strerror err))
(list err)))))
-(define* (terminal-columns #:optional (port (current-output-port)))
- "Return the best approximation of the number of columns of the terminal at
-PORT, trying to guess a reasonable value if all else fails. The result is
-always a positive integer."
- (define (fall-back)
- (match (and=> (getenv "COLUMNS") string->number)
- (#f 80)
- ((? number? columns)
- (if (> columns 0) columns 80))))
-
+(define (terminal-dimension window-dimension port fall-back)
+ "Return the terminal dimension defined by WINDOW-DIMENSION, one of
+'window-size-columns' or 'window-size-rows' for PORT. If PORT does not
+correspond to a terminal, return the value returned by FALL-BACK."
(catch 'system-error
(lambda ()
(if (file-port? port)
- (match (window-size-columns (terminal-window-size port))
+ (match (window-dimension (terminal-window-size port))
;; Things like Emacs shell-mode return 0, which is unreasonable.
(0 (fall-back))
- ((? number? columns) columns))
+ ((? number? n) n))
(fall-back)))
(lambda args
(let ((errno (system-error-errno args)))
@@ -1900,6 +1895,24 @@ always a positive integer."
(fall-back)
(apply throw args))))))
+(define* (terminal-columns #:optional (port (current-output-port)))
+ "Return the best approximation of the number of columns of the terminal at
+PORT, trying to guess a reasonable value if all else fails. The result is
+always a positive integer."
+ (define (fall-back)
+ (match (and=> (getenv "COLUMNS") string->number)
+ (#f 80)
+ ((? number? columns)
+ (if (> columns 0) columns 80))))
+
+ (terminal-dimension window-size-columns port fall-back))
+
+(define* (terminal-rows #:optional (port (current-output-port)))
+ "Return the best approximation of the number of rows of the terminal at
+PORT, trying to guess a reasonable value if all else fails. The result is
+always a positive integer."
+ (terminal-dimension window-size-rows port (const 25)))
+
;;;
;;; utmpx.