For discussion, see the following threads:
https://lists.gnu.org/archive/html/emacs-devel/2020-01/msg00843.htmlhttps://lists.gnu.org/archive/html/emacs-devel/2020-02/msg00042.htmlhttps://lists.gnu.org/archive/html/emacs-devel/2020-02/msg00282.html
* etc/NEWS: Announce that battery-upower is enabled by default.
* lisp/battery.el (battery-upower-device): Accept both battery and
line power device names, or a list thereof (bug#39491).
(battery-upower-line-power-device): Remove user option; superseded
by battery-upower-device.
(battery-upower-subscribe): New user option.
(battery-status-function): Check whether a UPower service is
provided without activating it.
(display-battery-mode): Subscribe to UPower signals when using
battery-upower.
(battery-upower): Merge data from multiple power sources. Calculate
terse battery status %b based on average battery load percentage
rather than coarse and often missing BatteryLevel (bug#39491). Add
support for average temperature %d.
(battery-upower-dbus-service)
(battery-upower-dbus-interface)
(battery-upower-dbus-path)
(battery-upower-dbus-device-interface)
(battery-upower-dbus-device-path)
(battery-upower-device-all-properties): Rename to...
(battery-upower-service)
(battery-upower-interface)
(battery-upower-path)
(battery-upower-device-interface)
(battery-upower-device-path)
(battery--upower-device-properties): ...these, respectively.
(battery-upower-device-list): Rename to...
(battery--upower-devices) ...this. Return a flat list of device
names determined by battery-upower-device.
(battery-upower-types, battery-upower-states)
(battery-upower-device-property, battery-upower-device-autodetect):
Remove.
(battery--upower-signals): New variable.
(battery--upower-signal-handler, battery--upower-props-changed)
(battery--upower-unsubscribe, battery--upower-subsribe)
(battery--upower-state): New functions.
* test/lisp/battery-tests.el (battery-upower-state)
(battery-upower-state-unknown): New tests.
* lisp/battery.el: Mention BSD support in Commentary. Don't load
preloaded lisp/emacs-lisp/timer.el.
(battery--files): New function.
(battery--find-linux-sysfs-batteries): Use it and make fewer
syscalls.
(battery-status-function): Perform GNU/Linux checks in increasing
order of obsolescence: sysfs, ACPI, and then APM. Simplify Darwin
check. Add :version tag now that battery-upower is the default.
(battery-echo-area-format, battery-mode-line-format): Mention %s.
(battery-load-low, battery-load-critical): New faces.
(battery-update): Display battery-mode-line-format even if
percentage is N/A. Apply faces battery-load-low or
battery-load-critical according to the percentage, but append them
so they don't override user customizations. Update all mode lines
since we are in global-mode-string.
(battery-linux-proc-apm-regexp): Mark as obsolete, replacing with...
(battery--linux-proc-apm): ...this new rx definition.
(battery-linux-proc-apm): Use it. Fix indentation. Simplify.
(battery--acpi-rate, battery--acpi-capacity): New rx definitions.
(battery-linux-proc-acpi): Use them. Fix pathological whitespace
regexps. Simplify.
(battery-linux-sysfs): Fix docstring and indentation. Reduce number
of file searches. Simplify.
(battery-bsd-apm): Fix docstring. Simplify.
(battery-pmset): Fix docstring. Simplify ID regexp.
* lisp/emacs-lisp/rx.el (rx-define): Indent as a defun.
* test/lisp/battery-tests.el (battery-linux-proc-apm-regexp): Test
new battery--linux-proc-apm rx definition.
(battery-acpi-rate-regexp, battery-acpi-capacity-regexp): New tests.
* lisp/format-spec.el: Use lexical-binding. Remove dependence on
subr-x.el.
(format-spec-make): Clarify docstring.
(format-spec--parse-modifiers): Rename to...
(format-spec--parse-flags): ...this and simplify. In particular,
don't bother parsing :space-pad which is redundant and unused.
(format-spec--pad): Remove, replacing with...
(format-spec--do-flags): ...this new helper function which performs
more of format-spec's supported text manipulation.
(format-spec): Autoload. Allow optional argument to take on special
values 'ignore' and 'delete' for more control over what happens when
a replacement for a format specification isn't provided. Bring back
proper support for a precision modifier similar to that of 'format'.
* lisp/battery.el (battery-format): Rewrite in terms of format-spec.
(battery-echo-area-format, battery-mode-line-format): Mention
support of format-spec syntax in docstrings.
* doc/lispref/strings.texi (Custom Format Strings):
* etc/NEWS: Document and announce these changes.
* lisp/dired-aux.el (dired-do-compress-to):
* lisp/erc/erc-match.el (erc-log-matches):
* lisp/erc/erc.el (erc-update-mode-line-buffer):
* lisp/gnus/gnus-sieve.el (gnus-sieve-update):
* lisp/gnus/gssapi.el (open-gssapi-stream):
* lisp/gnus/mail-source.el (mail-source-fetch-file)
(mail-source-fetch-directory, mail-source-fetch-pop)
(mail-source-fetch-imap):
* lisp/gnus/message.el (message-insert-formatted-citation-line):
* lisp/image-dired.el:
* lisp/net/eww.el:
* lisp/net/imap.el (imap-kerberos4-open, imap-gssapi-open)
(imap-shell-open):
* lisp/net/network-stream.el (network-stream-open-shell):
* lisp/obsolete/tls.el (open-tls-stream):
* lisp/textmodes/tex-mode.el:
Remove extraneous loads and autoloads of format-spec now that it is
autoloaded and simplify its uses where possible.
* test/lisp/battery-tests.el (battery-format): Test new format-spec
support.
* test/lisp/format-spec-tests.el (test-format-spec): Rename to...
(format-spec) ...this, extending test cases.
(test-format-unknown): Rename to...
(format-spec-unknown): ...this, extending test cases.
(test-format-modifiers): Rename to...
(format-spec-flags): ...this.
(format-spec-make, format-spec-parse-flags, format-spec-do-flags)
(format-spec-do-flags-truncate, format-spec-do-flags-pad)
(format-spec-do-flags-chop, format-spec-do-flags-case): New tests.
