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[bug#36390] [PATCH 2/3] syscalls: Add 'terminal-rows'.
From: |
Ludovic Courtès |
Subject: |
[bug#36390] [PATCH 2/3] syscalls: Add 'terminal-rows'. |
Date: |
Wed, 26 Jun 2019 10:59:03 +0200 |
* 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.
---
guix/build/syscalls.scm | 37 +++++++++++++++++++++++++------------
tests/syscalls.scm | 5 ++++-
2 files changed, 29 insertions(+), 13 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.
diff --git a/tests/syscalls.scm b/tests/syscalls.scm
index 3e267c9f01..eeb223b950 100644
--- a/tests/syscalls.scm
+++ b/tests/syscalls.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <address@hidden>
+;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès
<address@hidden>
;;; Copyright © 2015 David Thompson <address@hidden>
;;;
;;; This file is part of GNU Guix.
@@ -538,6 +538,9 @@
(> (terminal-columns (open-input-string "Join us now, share the software!"))
0))
+(test-assert "terminal-rows"
+ (> (terminal-rows) 0))
+
(test-assert "utmpx-entries"
(match (utmpx-entries)
(((? utmpx? entries) ...)
--
2.22.0