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bug#21002: 25.0.50; (elisp): `Mode Line Variables', doc of `display-time

From: Drew Adams
Subject: bug#21002: 25.0.50; (elisp): `Mode Line Variables', doc of `display-time-string'
Date: Tue, 7 Jul 2015 07:44:56 -0700 (PDT)

Variable `global-mode-string' is described in (elisp): `Mode Line
Variables', including its default value.  `display-time-string' is
mentioned explicitly.

But `C-h v' tells you nothing about `display-time-string'.  To
understand something about it you need to look at `time.el'.

1. At the least, some doc string should be added for
   `display-time-string'.  It can, for example, refer users to command
   `display-time' or to (emacs) `Optional Mode Line', where `display-time'
   is covered.

2. (elisp): `Mode Line Variables' should itself cross-reference (emacs)
   `Optional Mode Line' or at least mention command `display-time',
   where it mentions `display-time-string'.

Displaying the time in the mode-line is a user-level thing, and there
are many user options that control the resulting `display-time-string'.
The only mention of `display-time-string' in the Elisp manual should at
least point readers to information about the things that control the
content of `display-time-string', especially since most of these things
are user-level controls (e.g., options, a command).

In GNU Emacs (i686-pc-mingw32)
 of 2014-10-20 on LEG570
Bzr revision: 118168 address@hidden
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking=yes,glyphs CPPFLAGS=-DGLYPH_DEBUG=1'

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