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The Emacs command `C-x 4 a' adds a new entry to the change log file
for the file you are editing (`add-change-log-entry-other-window').
A change log file contains a chronological record of when and why you
have changed a program, consisting of a sequence of entries describing
individual changes. Normally it is kept in a file called `ChangeLog'
in the same directory as the file you are editing, or one of its parent
directories. A single `ChangeLog' file can record changes for all the
files in its directory and all its subdirectories.
A change log entry starts with a header line that contains your name
and the current date. Aside from these header lines, every line in the
change log starts with a space or a tab. The bulk of the entry consists
of "items", each of which starts with a line starting with whitespace
and a star. Here are two entries, each with two items:
Wed May 5 14:11:45 1993 Richard Stallman (firstname.lastname@example.org)
* man.el: Rename functions and variables `man-*' to `Man-*'.
(manual-entry): Make prompt string clearer.
* simple.el (blink-matching-paren-distance): Change default to 12,000.
Tue May 4 12:42:19 1993 Richard Stallman (email@example.com)
* vc.el (minor-mode-map-alist): Don't use it if it's void.
(vc-cancel-version): Doc fix.
One entry can describe several changes; each change should have its
own item. Normally there should be a blank line between items. When
items are related (parts of the same change, in different places), group
them by leaving no blank line between them. The second entry above
contains two items grouped in this way.
`C-x 4 a' visits the change log file and creates a new entry unless
the most recent entry is for today's date and your name. It also
creates a new item for the current file. For many languages, it can
even guess the name of the function or other object that was changed.
The change log file is visited in Change Log mode. Each bunch of
grouped items counts as one paragraph, and each entry is considered a
page. This facilitates editing the entries. LFD and auto-fill indent
each new line like the previous line; this is convenient for entering
the contents of an entry.
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