bug#58307: 29.0.50; Fix battery mode over TRAMP on *BSD

[Manuel Giraud <manuel@ledu-giraud.fr>]

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Hi,

I'm using OpenBSD on a laptop.  I'm also using battery-mode.  Whenever,
I'm accessing another machine over TRAMP, the string displayed by
battery-mode become useless in this buffer.

The attached patch fixes this issue.  AFAIU, shell-command-to-string is
using the current directory of the buffer and fails to find a usable
"/usr/sbin/apm" on a remote Linux, for instance.  So I'm using
call-process that does call the local "/usr/sbin/apm".

Best regards,

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From e0a4eaa69171378664e28e8ab30a0e83e09ce19c Mon Sep 17 00:00:00 2001
From: Manuel Giraud <manuel@ledu-giraud.fr>
Date: Wed, 5 Oct 2022 15:59:14 +0200
Subject: [PATCH] Fix BSD battery mode over TRAMP

* lisp/battery.el (call-process-to-string): Simple wrapper to
  `call-process' that outputs to a string.
  (battery-bsd-apm): Use it instead of `shell-command-to-string'.
---
 lisp/battery.el | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lisp/battery.el b/lisp/battery.el
index 72b3dfdae7..0fae92ab98 100644
--- a/lisp/battery.el
+++ b/lisp/battery.el
@@ -913,6 +913,10 @@ battery-upower
 
 \f
 ;;; `apm' interface for BSD.
+(defun call-process-to-string (program &rest args)
+  (with-output-to-string
+    (with-current-buffer standard-output
+      (apply #'call-process program nil t nil args))))
 
 (defun battery-bsd-apm ()
   "Get APM status information from BSD apm binary.
@@ -929,13 +933,13 @@ battery-bsd-apm
 %t Remaining time (to charge or discharge) in the form `h:min'"
   (let* ((os-name (car (split-string
                         ;; FIXME: Can't we use something like `system-type'?
-                        (shell-command-to-string "/usr/bin/uname"))))
+                        (call-process-to-string "/usr/bin/uname"))))
          (apm-flag (pcase os-name
                      ("OpenBSD" "mP")
                      ("FreeBSD" "st")
                      (_         "ms")))
-         (apm-cmd (concat "/usr/sbin/apm -abl" apm-flag))
-         (apm-output (split-string (shell-command-to-string apm-cmd)))
+         (apm-args (concat "-abl" apm-flag))
+         (apm-output (split-string (call-process-to-string "/usr/sbin/apm" apm-args)))
          (indices (pcase os-name
                     ;; FreeBSD's manpage documents that multiple
                     ;; outputs are ordered by "the order in which
-- 
2.37.3


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In GNU Emacs 29.0.50 (build 2, x86_64-unknown-openbsd7.2, cairo version
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Repository revision: 6430c4c44f3cbfdaa702302017afbc5d442960f3
Repository branch: mgi/battery
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-- 
Manuel Giraud