From: Thomas Dean <tdean9db@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Writing a Lisp to show the capacity of the battery of the laptop
Date: Mon, 21 Feb 2011 22:46:32 +0800 [thread overview]
Message-ID: <87r5b1phrr.fsf@gmail.com> (raw)
Hi,
I'm using Archlinux. I want to write a lisp to show the remaining
capacity of the battery of the laptop. It is expected to work like
this:
1. Read from /proc/acpi/battery/BAT0/state and obtain the remaining
capacity of the battery.
2. Read from /proc/acpi/battery/BAT0/info and obtain the full capacity
of the battery.
3. By calculating remaining / full, get the percentage and print it.
I writing the following lisp but it seems that it doesn't work.
;--------------------------------LISP---------------------------------
; get remaining capacity
(shell-command
"cat /proc/acpi/battery/BAT0/state | grep \"remaining capacity\" | sed \"s/^[a-z][a-z: ]*\([0-9][0-9]*\).*$/\1/g\""
"td-battery-temp-buffer")
(set-buffer "td-battery-temp-buffer")
(setq td-battery-full (string-to-number (buffer-string)))
(erase-buffer)
; get full capacity
(shell-command
"cat /proc/acpi/battery/BAT0/info | grep \"last full capacity\" | sed \"s/^[a-z][a-z: ]*\([0-9][0-9]*\).*$/\1/g\""
"td-battery-temp-buffer")
(setq td-battery-full (string-to-number (buffer-string)))
; calculate percentage
(message (concat "Remaining Capacity: " (number-to-string td-battery-remaining)
"\nFull Capacity: " (number-to-string td-battery-full)))
; kill temporary buffer
(set-buffer-modified-p nil)
(kill-buffer)
;----------------------LISP END-------------------------------
I'm new to lisp :-) So it maybe looks ugly.
Could you please show me a good lisp that can finish this task?
Thomas
--
next reply other threads:[~2011-02-21 14:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-21 14:46 Thomas Dean [this message]
2011-02-22 15:13 ` Writing a Lisp to show the capacity of the battery of the laptop Le Wang
2011-02-22 15:33 ` Deniz Dogan
2011-02-22 16:51 ` Alberto Luaces
2011-02-22 17:25 ` Deniz Dogan
2011-02-22 17:35 ` Alberto Luaces
2011-02-22 17:41 ` Deniz Dogan
2011-02-22 17:25 ` Eli Zaretskii
[not found] <mailman.14.1298381790.4429.help-gnu-emacs@gnu.org>
2011-02-22 16:48 ` Pascal J. Bourguignon
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