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The Alt-; command creates
a comment on the current line, using the commenting style of the
current language mode. The comment begins at the column specified by
the comment-column variable (by default 40). (However, if the
comment is the first thing on the line and
indent-comment-as-code is nonzero, it indents to the column
specified by the buffer's language-specific indentation function.) If
the line already has a comment, this command moves the comment to the
comment column. (Also see the align-region command described
in Aligning to align all comments in a region to the same
With a numeric argument, Alt-; searches for the
next comment in the buffer and goes to its start. With a negative
argument, Alt-; searches backwards for a comment. Press Alt-; again
to reindent the comment.
By default (and in modes that don't specify a commenting style),
comments begin with the ; character and continue to the end of the
line. C mode recognizes both old-style /* */ comments, and the newer
C++-style comments //, and by default creates the latter. Set the
variable new-c-comments to 0 if you want Alt-; to create
The Ctrl-X ; command sets future comments to begin at the current
column. With a positive argument, it sets the comment column based on
the indentation of the previous comment in the buffer.
If the current line has a comment, this command reindents it.
With a negative argument (as in Alt-<Minus> Ctrl-X ;), the Ctrl-X ;
command doesn't change the comment column at all. Instead, it kills
any comment on the current line. The command saves the comment in a
You can comment out a region of text by pressing Ctrl-C Ctrl-R.
Epsilon adds a comment delimiter to the start of each line in the
region between point and mark. With a numeric argument, as in Ctrl-U
Ctrl-C Ctrl-R, Epsilon removes such a comment delimiter from each
The comment commands look for comments using regular expression
patterns (see Regular Expressions) contained in the buffer-specific
variables comment-pattern (which should match the whole
comment) and comment-start (which should match the sequence
that begins a comment, like "/*"). When creating a comment, it
inserts the contents of the buffer-specific variables
comment-begin and comment-end around the new comment.
When Epsilon puts a buffer in C mode, it decides how to set these
variables based on the new-c-comments variable.
In certain modes, including C and Perl modes,
Epsilon normally auto-fills text in block comments as you type,
breaking overly long lines. See the c-auto-fill-mode variable
for C and Perl modes, tex-auto-fill-mode for TeX,
html-auto-fill-mode for HTML, xml-auto-fill-mode for XML,
and misc-language-fill-mode in Makefile, VHDL, Visual Basic,
Python, PostScript, Conf, and Ini modes. As with normal auto-fill
mode (see Formatting Text), use Ctrl-X F to set the right
margin for filling. Set the c-fill-column variable to change
the default right margin in C and Perl mode buffers;
margin-right in other modes.
You can manually refill the current paragraph in a block comment by
pressing Alt-q. If you provide a numeric prefix argument to Alt-q,
say by typing Alt-2 Alt-q, it will fill using the current column as
the right margin. By default, Epsilon doesn't apply auto-filling to
a comment line that also contains non-comment text (such as a C
statement with a comment after it on the same line). Use Alt-q to
break such lines.
The auto-fill-comment-rules variable lets you customize certain
aspects of Epsilon's behavior when breaking and filling comment lines.
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