@cindex Perl mode
@cindex Icon mode
-@cindex Awk mode
@cindex Makefile mode
@cindex Tcl mode
@cindex CPerl mode
@cindex PostScript mode
The existing programming language major modes include Lisp, Scheme (a
variant of Lisp) and the Scheme-based DSSSL expression language, Ada,
-Awk, C, C++, Delphi (Object Pascal), Fortran (free format and fixed
+AWK, C, C++, Delphi (Object Pascal), Fortran (free format and fixed
format), Icon, IDL (CORBA), IDLWAVE, Java, Metafont (@TeX{}'s
companion for font creation), Modula2, Objective-C, Octave, Pascal,
Perl, Pike, PostScript, Prolog, Simula, Tcl, and VHDL. There is
tab character before point, in these modes.
Separate manuals are available for the modes for Ada (@pxref{Top, , Ada
-Mode, ada-mode, Ada Mode}), C/C++/Objective C/Java/Corba IDL
+Mode, ada-mode, Ada Mode}), C/C++/Objective C/Java/Corba IDL/Pike/AWK
(@pxref{Top, , CC Mode, ccmode, CC Mode}) and the IDLWAVE modes
(@pxref{Top, , IDLWAVE, idlwave, IDLWAVE User Manual}).
")
@end example
+ To help you catch violations of this convention, Font Lock mode
+highlights confusing opening delimiters (those that ought to be
+quoted) in bold red.
+
In the earliest days, the original Emacs found defuns by moving
upward a level of parentheses or braces until there were no more
levels to go up. This always required scanning all the way back to
reindents the current line as usual, then reindents by the same amount
all the lines in the parenthetical grouping starting on the current
line. It is clever, though, and does not alter lines that start
-inside strings, or C preprocessor lines when in C mode.
+inside strings. Neither does it alter C preprocessor lines when in C
+mode, but it does reindent any continuation lines that may be attached
+to them.
@findex indent-code-rigidly
You can also perform this operation on the region, using the command
@kbd{M-x indent-code-rigidly}. It rigidly shifts all the lines in the
region sideways, like @code{indent-rigidly} does (@pxref{Indentation
Commands}). It doesn't alter the indentation of lines that start
-inside a comment or a string, unless the region starts inside that
-comment or string.
+inside a string, unless the region also starts inside that string.
@node Lisp Indent
@subsection Customizing Lisp Indentation
@cindex @code{lisp-indent-function} property
You can override the standard pattern in various ways for individual
-functions, according to the @code{lisp-indent-function} property of the
-function name. There are four possibilities for this property:
-
-@table @asis
-@item @code{nil}
-This is the same as no property---use the standard indentation pattern.
-@item @code{defun}
-Handle this function like a @samp{def} construct: treat the second
-line as the start of a @dfn{body}.
-@item a number, @var{number}
-The first @var{number} arguments of the function are
-@dfn{distinguished} arguments; the rest are considered the body
-of the expression. A line in the expression is indented according to
-whether the first argument on it is distinguished or not. If the
-argument is part of the body, the line is indented @code{lisp-body-indent}
-more columns than the open-parenthesis starting the containing
-expression. If the argument is distinguished and is either the first
-or second argument, it is indented @emph{twice} that many extra columns.
-If the argument is distinguished and not the first or second argument,
-the line uses the standard pattern.
-@item a symbol, @var{symbol}
-@var{symbol} should be a function name; that function is called to
-calculate the indentation of a line within this expression. The
-function receives two arguments:
-@table @asis
-@item @var{state}
-The value returned by @code{parse-partial-sexp} (a Lisp primitive for
-indentation and nesting computation) when it parses up to the
-beginning of this line.
-@item @var{pos}
-The position at which the line being indented begins.
-@end table
-@noindent
-It should return either a number, which is the number of columns of
-indentation for that line, or a list whose car is such a number. The
-difference between returning a number and returning a list is that a
-number says that all following lines at the same nesting level should
-be indented just like this one; a list says that following lines might
-call for different indentations. This makes a difference when the
-indentation is being computed by @kbd{C-M-q}; if the value is a
-number, @kbd{C-M-q} need not recalculate indentation for the following
-lines until the end of the list.
-@end table
+functions, according to the @code{lisp-indent-function} property of
+the function name. Normally you would use this for macro definitions
+and specify it using the @code{declare} construct (@pxref{Defining
+Macros,,, elisp, the Emacs Lisp Reference Manual}).
@node C Indent
@subsection Commands for C Indentation
@kindex C-M-q @r{(C mode)}
@findex c-indent-exp
Reindent each line in the balanced expression that follows point
-(@code{c-indent-exp}). A prefix argument inhibits error checking and
-warning messages about invalid syntax.
+(@code{c-indent-exp}). A prefix argument inhibits warning messages
+about invalid syntax.
@item @key{TAB}
@findex c-indent-command
Reindent the current line, and/or in some cases insert a tab character
(@code{c-indent-command}).
+@vindex c-tab-always-indent
If @code{c-tab-always-indent} is @code{t}, this command always reindents
the current line and does nothing else. This is the default.
if @code{indent-tabs-mode} is @code{nil}).
Any other value (not @code{nil} or @code{t}) means always reindent the
-line, and also insert a tab if within a comment, a string, or a
-preprocessor directive.
+line, and also insert a tab if within a comment or a string.
@end table
To reindent the whole current buffer, type @kbd{C-x h C-M-\}. This
@subsection Customizing C Indentation
@cindex style (for indentation)
- C mode and related modes use a simple yet flexible mechanism for
-customizing indentation. The mechanism works in two steps: first it
-classifies the line syntactically according to its contents and context;
-second, it associates each kind of syntactic construct with an
-indentation offset based on your selected @dfn{style}.
+ C mode and related modes use a flexible mechanism for customizing
+indentation. C mode indents a source line in two steps: first it
+classifies the line syntactically according to its contents and
+context; second, it determines the indentation offset associated by
+your selected @dfn{style} with the syntactic construct and adds this
+onto the indentation of the @dfn{anchor statement}.
@table @kbd
-@item M-x c-set-style @key{RET} @var{style} @key{RET}
-Select predefined indentation style @var{style}.
+@item C-c . @key{RET} @var{style} @key{RET}
+Select a predefined style @var{style} (@code{c-set-style}).
@end table
- A style is a named collection of indentation customizations that can
+ A @dfn{style} is a named collection of customizations that can
be used in C mode and the related modes. Emacs comes with several
predefined styles, including @code{gnu}, @code{k&r}, @code{bsd},
@code{stroustrup}, @code{linux}, @code{python}, @code{java},
some code, e.g., by typing @key{C-M-q} at the start of a function
definition.
+@kindex C-c . @r{(C mode)}
@findex c-set-style
- To choose a style for the current buffer, use the command @kbd{M-x
-c-set-style}. Specify a style name as an argument (case is not
-significant). This command affects the current buffer only, and it
-affects only future invocations of the indentation commands; it does
-not reindent the code in the buffer. To reindent the whole buffer in
-the new style, you can type @kbd{C-x h C-M-\}.
+ To choose a style for the current buffer, use the command @kbd{C-c
+.}. Specify a style name as an argument (case is not significant).
+This command affects the current buffer only, and it affects only
+future invocations of the indentation commands; it does not reindent
+the code in the buffer. To reindent the whole buffer in the new
+style, you can type @kbd{C-x h C-M-\}.
@vindex c-default-style
You can also set the variable @code{c-default-style} to specify the
-default style for various major modes. Its value should be an alist,
-in which each element specifies one major mode and which indentation
-style to use for it. For example,
+default style for various major modes. Its value should be either the
+style's name (a string) or an alist, in which each element specifies
+one major mode and which indentation style to use for it. For
+example,
@example
(setq c-default-style
Move backward over a balanced expression(@code{backward-sexp}).
@item C-M-k
Kill balanced expression forward (@code{kill-sexp}).
-@item C-M-@key{DEL}
-Kill balanced expression backward (@code{backward-kill-sexp}).
@item C-M-t
Transpose expressions (@code{transpose-sexps}).
@item C-M-@@
+@itemx C-M-@key{SPC}
Put mark after following expression (@code{mark-sexp}).
@end table
@cindex killing expressions
@kindex C-M-k
@findex kill-sexp
-@kindex C-M-DEL
-@findex backward-kill-sexp
Killing a whole balanced expression can be done with @kbd{C-M-k}
-(@code{kill-sexp}) or @kbd{C-M-@key{DEL}} (@code{backward-kill-sexp}).
-@kbd{C-M-k} kills the characters that @kbd{C-M-f} would move over, and
-@kbd{C-M-@key{DEL}} kills the characters that @kbd{C-M-b} would move
-over. On some machines, @kbd{C-M-@key{DEL}} typed on the console is a
-command to reboot; when that is so, you cannot use it as an Emacs
-command. This conflict is rare, though: usually the @key{DEL} key for
-Emacs is really @key{BACKSPACE}, and the reboot command is
-@kbd{C-M-@key{DELETE}}, so there is no conflict.
+(@code{kill-sexp}). @kbd{C-M-k} kills the characters that @kbd{C-M-f}
+would move over.
@cindex transposition of expressions
@kindex C-M-t
at or after point and the mark.
@kindex C-M-@@
+@kindex C-M-@key{SPC}
@findex mark-sexp
To set the region around the next balanced expression in the buffer,
use @kbd{C-M-@@} (@code{mark-sexp}), which sets mark at the same place
that @kbd{C-M-f} would move to. @kbd{C-M-@@} takes arguments like
@kbd{C-M-f}. In particular, a negative argument is useful for putting
the mark at the beginning of the previous balanced expression.
+The alias @kbd{C-M-@key{SPC}} is equivalent to @kbd{C-M-@@}.
In languages that use infix operators, such as C, it is not possible
to recognize all balanced expressions as such because there can be
@cindex comments
Because comments are such an important part of programming, Emacs
-provides special commands for editing and inserting comments.
+provides special commands for editing and inserting comments. It can
+also do spell checking on comments with Flyspell Prog mode
+(@pxref{Spelling}).
@menu
* Comment Commands:: Inserting, killing, and indenting comments.
The comment commands in this table insert, kill and align comments.
They are described in this section and following sections.
-@table @kbd
-@item M-;
+@table @asis
+@item @kbd{M-;}
Insert or realign comment on current line; alternatively, comment or
uncomment the region (@code{comment-dwim}).
-@item C-u M-;
+@item @kbd{C-u M-;}
Kill comment on current line (@code{comment-kill}).
-@item C-x ;
+@item @kbd{C-x ;}
Set comment column (@code{comment-set-column}).
-@item C-M-j
+@item @kbd{C-M-j}
+@itemx @kbd{M-j}
Like @key{RET} followed by inserting and aligning a comment
(@code{comment-indent-new-line}).
-@item M-x comment-region
+@item @kbd{M-x comment-region}
+@itemx @kbd{C-c C-c} (in C-like modes)
Add or remove comment delimiters on all the lines in the region.
@end table
@subsection Multiple Lines of Comments
@kindex C-M-j
+@kindex M-j
@cindex blank lines in programs
@findex comment-indent-new-line
If you are typing a comment and wish to continue it on another line,
-you can use the command @kbd{C-M-j} (@code{comment-indent-new-line}).
-This terminates the comment you are typing, creates a new blank line
-afterward, and begins a new comment indented under the old one. When
-Auto Fill mode is on, going past the fill column while typing a comment
-causes the comment to be continued in just this fashion. If point is
-not at the end of the line when @kbd{C-M-j} is typed, the text on
-the rest of the line becomes part of the new comment line.
-
+you can use the command @kbd{C-M-j} or @kbd{M-j}
+(@code{comment-indent-new-line}). This terminates the comment you are
+typing, creates a new blank line afterward, and begins a new comment
+indented under the old one. When Auto Fill mode is on, going past the
+fill column while typing a comment causes the comment to be continued
+in just this fashion. If point is not at the end of the line when you
+type the command, the text on the rest of the line becomes part of the
+new comment line.
+
+@kindex C-c C-c (C mode)
@findex comment-region
To turn existing lines into comment lines, use the @kbd{M-x
comment-region} command. It adds comment delimiters to the lines that start
@vindex comment-column
@kindex C-x ;
@findex comment-set-column
- The comment column is stored in the variable @code{comment-column}. You
-can set it to a number explicitly. Alternatively, the command @kbd{C-x ;}
-(@code{comment-set-column}) sets the comment column to the column point is
-at. @kbd{C-u C-x ;} sets the comment column to match the last comment
-before point in the buffer, and then does a @kbd{M-;} to align the
-current line's comment under the previous one.
+ The @dfn{comment column}, the column at which Emacs tries to place
+comments, is stored in the variable @code{comment-column}. You can
+set it to a number explicitly. Alternatively, the command @kbd{C-x ;}
+(@code{comment-set-column}) sets the comment column to the column
+point is at. @kbd{C-u C-x ;} sets the comment column to match the
+last comment before point in the buffer, and then does a @kbd{M-;} to
+align the current line's comment under the previous one.
The variable @code{comment-column} is per-buffer: setting the variable
in the normal fashion affects only the current buffer, but there is a
than the comment starting delimiter in the strictest sense of the word;
for example, in C mode the value of the variable is
@c This stops M-q from breaking the line inside that @code.
-@code{@w{"/\\*+ *\\|//+ *""}}, which matches extra stars and spaces
+@code{@w{"/\\*+ *\\|//+ *"}}, which matches extra stars and spaces
after the @samp{/*} itself, and accepts C++ style comments also.
(Note that @samp{\\} is needed in Lisp syntax to include a @samp{\} in
the string, which is needed to deny the first star its special meaning
@vindex comment-padding
The variable @code{comment-padding} specifies how many spaces
-@code{comment-region} should insert on each line between the
-comment delimiter and the line's original text. The default is 1,
-to insert one space.
+@code{comment-region} should insert on each line between the comment
+delimiter and the line's original text. The default is 1, to insert
+one space. @code{nil} means 0. Alternatively, @code{comment-padding}
+can hold the actual string to insert.
@vindex comment-multi-line
The variable @code{comment-multi-line} controls how @kbd{C-M-j}
-(@code{indent-new-comment-line}) behaves when used inside a comment. If
-@code{comment-multi-line} is @code{nil}, as it normally is, then the
-comment on the starting line is terminated and a new comment is started
-on the new following line. If @code{comment-multi-line} is not
-@code{nil}, then the new following line is set up as part of the same
-comment that was found on the starting line. This is done by not
-inserting a terminator on the old line, and not inserting a starter on
-the new line. In languages where multi-line comments work, the choice
-of value for this variable is a matter of taste.
+(@code{indent-new-comment-line}) behaves when used inside a comment.
+Specifically, when @code{comment-multi-line} is @code{nil} (the
+default value), the command inserts a comment terminator, begins a new
+line, and finally inserts a comment starter. Otherwise it does not
+insert the terminator and starter, so it effectively continues the
+current comment across multiple lines. In languages that allow
+multi-line comments, the choice of value for this variable is a matter
+of taste.
@vindex comment-indent-function
The variable @code{comment-indent-function} should contain a function
@findex info-lookup-symbol
@findex info-lookup-file
-@kindex C-h C-i
+@kindex C-h S
For C, Lisp, and other languages that have documentation in Info,
-you can use @kbd{C-h C-i} (@code{info-lookup-symbol}) to view the Info
+you can use @kbd{C-h S} (@code{info-lookup-symbol}) to view the Info
documentation for a symbol. You specify the symbol with the
minibuffer; the default is the symbol appearing in the buffer at
point.
You can also use @kbd{M-x info-lookup-file} to look for documentation
for a file name.
- This feature currently supports the modes Awk, Autoconf, Bison, C,
+ This feature currently supports the modes AWK, Autoconf, Bison, C,
Emacs Lisp, LaTeX, M4, Makefile, Octave, Perl, Scheme, and Texinfo,
provided you have installed the relevant Info files, which are
typically available with the appropriate GNU package.
@findex manual-entry
You can read the man page for an operating system command, library
-function, or system call, with the @kbd{M-x manual-entry} command. It
+function, or system call, with the @kbd{M-x man} command. It
runs the @code{man} program to format the man page; if the system
permits, it runs @code{man} asynchronously, so that you can keep on
editing while the page is being formatted. (On MS-DOS and MS-Windows
command @kbd{M-x glasses-mode} to enable or disable the mode in the
current buffer; you can also add @code{glasses-mode} to the mode hook
of the programming language major modes in which you normally want
-to use Glasses mode.
+to use Glasses mode.
@node Misc for Programs
@section Other Features Useful for Editing Programs
@cindex CORBA IDL mode
@cindex Objective C mode
@cindex C++ mode
+@cindex AWK mode
@cindex mode, Java
@cindex mode, C
+@cindex mode, C++
@cindex mode, Objective C
@cindex mode, CORBA IDL
@cindex mode, Pike
+@cindex mode, AWK
This section gives a brief description of the special features
-available in C, C++, Objective-C, Java, CORBA IDL, and Pike modes.
-(These are called ``C mode and related modes.'') @xref{Top, CC Mode,
-ccmode, , CC Mode}, for a more extensive description of these modes
+available in C, C++, Objective-C, Java, CORBA IDL, Pike and AWK modes.
+(These are called ``C mode and related modes.'') @xref{Top, , CC Mode,
+ccmode, CC Mode}, for a more extensive description of these modes
and their special features.
@menu
-* Motion in C:: Commands to move by C statements, etc.
-* Electric C:: Colon and other chars can automatically reindent.
-* Hungry Delete:: A more powerful DEL command.
-* Other C Commands:: Filling comments, viewing expansion of macros,
- and other neat features.
-* Comments in C:: Options for customizing comment style.
+* Motion in C:: Commands to move by C statements, etc.
+* Electric C:: Colon and other chars can automatically reindent.
+* Hungry Delete:: A more powerful DEL command.
+* Other C Commands:: Filling comments, viewing expansion of macros,
+ and other neat features.
@end menu
@node Motion in C
related modes.
@table @code
+@item M-x c-beginning-of-defun
+@itemx M-x c-end-of-defun
+@findex c-beginning-of-defun
+@findex c-end-of-defun
+Move point to the beginning or end of the current function or
+top-level definition. These are found by searching for the least
+enclosing braces. (By contrast, @code{beginning-of-defun} and
+@code{end-of-defun} search for braces in column zero.) If you are
+editing code where the opening brace of a function isn't placed in
+column zero, you may wish to bind @code{C-M-a} and @code{C-M-e} to
+these commands. @xref{Moving by Defuns}.
+
@item C-c C-u
@kindex C-c C-u @r{(C mode)}
@findex c-up-conditional
Move point back to the containing preprocessor conditional, leaving the
mark behind. A prefix argument acts as a repeat count. With a negative
argument, move point forward to the end of the containing
-preprocessor conditional. When going backwards, @code{#elif} is treated
-like @code{#else} followed by @code{#if}. When going forwards,
-@code{#elif} is ignored.@refill
+preprocessor conditional.
+
+@samp{#elif} is equivalent to @samp{#else} followed by @samp{#if}, so
+the function will stop at a @samp{#elif} when going backward, but not
+when going forward.
@item C-c C-p
@kindex C-c C-p @r{(C mode)}
argument, move backward.
@item M-a
-@kindex ESC a
+@kindex M-a (C mode)
@findex c-beginning-of-statement
Move point to the beginning of the innermost C statement
(@code{c-beginning-of-statement}). If point is already at the beginning
of a statement, move to the beginning of the preceding statement. With
prefix argument @var{n}, move back @var{n} @minus{} 1 statements.
-If point is within a string or comment, or next to a comment (only
-whitespace between them), this command moves by sentences instead of
-statements.
-
-When called from a program, this function takes three optional
-arguments: the numeric prefix argument, a buffer position limit
-(don't move back before that place), and a flag that controls whether
-to do sentence motion when inside of a comment.
+In comments or in strings which span more than one line, this command
+moves by sentences instead of statements.
@item M-e
-@kindex ESC e
+@kindex M-e (C mode)
@findex c-end-of-statement
-Move point to the end of the innermost C statement; like @kbd{M-a}
-except that it moves in the other direction (@code{c-end-of-statement}).
+Move point to the end of the innermost C statement or sentence; like
+@kbd{M-a} except that it moves in the other direction
+(@code{c-end-of-statement}).
@item M-x c-backward-into-nomenclature
@findex c-backward-into-nomenclature
@table @kbd
@item C-c :
+@ifinfo
@c This uses ``colon'' instead of a literal `:' because Info cannot
@c cope with a `:' in a menu
@kindex C-c @key{colon} @r{(C mode)}
+@end ifinfo
+@ifnotinfo
+@kindex C-c : @r{(C mode)}
+@end ifnotinfo
@findex c-scope-operator
Insert a double colon scope operator at point, without reindenting the
line or adding any newlines (@code{c-scope-operator}).
@end table
+@vindex c-electric-pound-behavior
The electric @kbd{#} key reindents the line if it appears to be the
beginning of a preprocessor directive. This happens when the value of
@code{c-electric-pound-behavior} is @code{(alignleft)}. You can turn
this feature off by setting @code{c-electric-pound-behavior} to
@code{nil}.
+@vindex c-hanging-braces-alist
The variable @code{c-hanging-braces-alist} controls the insertion of
newlines before and after inserted braces. It is an association list
with elements of the following form: @code{(@var{syntactic-symbol}
after, or both. If not found, the default is to insert a newline both
before and after braces.
+@vindex c-hanging-colons-alist
The variable @code{c-hanging-colons-alist} controls the insertion of
newlines before and after inserted colons. It is an association list
with elements of the following form: @code{(@var{syntactic-symbol}
If the syntactic symbol is not found in this list, no newlines are
inserted.
+@vindex c-cleanup-list
Electric characters can also delete newlines automatically when the
auto-newline feature is enabled. This feature makes auto-newline more
acceptable, by deleting the newlines in the most common cases where you
@node Hungry Delete
@subsection Hungry Delete Feature in C
+@cindex hungry deletion (C Mode)
When the @dfn{hungry-delete} feature is enabled (indicated by
@samp{/h} or @samp{/ah} in the mode line after the mode name), a single
@subsection Other Commands for C Mode
@table @kbd
+@item M-x c-context-line-break
+@findex c-context-line-break
+This command inserts a line break and indents the new line in a manner
+appropriate to the context. In normal code, it does the work of
+@kbd{C-j} (@code{newline-and-indent}), in a C preprocessor line it
+additionally inserts a @samp{\} at the line break, and within comments
+it's like @kbd{M-j} (@code{c-indent-new-comment-line}).
+
+@code{c-context-line-break} isn't bound to a key by default, but it
+needs a binding to be useful. The following code will bind it to
+@kbd{C-j}.
+@example
+(define-key c-mode-base-map "\C-j" 'c-context-line-break)
+@end example
+
@item C-M-h
Put mark at the end of a function definition, and put point at the
beginning (@code{c-mark-function}).
@itemx M-x global-cwarn-mode
@findex cwarn-mode
@findex global-cwarn-mode
+@vindex global-cwarn-mode
@cindex CWarn mode
@cindex suspicious constructions in C, C++
CWarn minor mode highlights certain suspicious C and C++ constructions:
names.
@end table
-@node Comments in C
-@subsection Comments in C Modes
-
- C mode and related modes use a number of variables for controlling
-comment format.
-
-@table @code
-@item c-comment-only-line-offset
-@vindex c-comment-only-line-offset
-Extra offset for line which contains only the start of a comment. It
-can be either an integer or a cons cell of the form
-@code{(@var{non-anchored-offset} . @var{anchored-offset})}, where
-@var{non-anchored-offset} is the amount of offset given to
-non-column-zero anchored comment-only lines, and @var{anchored-offset}
-is the amount of offset to give column-zero anchored comment-only lines.
-Just an integer as value is equivalent to @code{(@var{val} . 0)}.
-
-@item c-comment-start-regexp
-@vindex c-comment-start-regexp
-This buffer-local variable specifies how to recognize the start of a comment.
-
-@item c-hanging-comment-ender-p
-@vindex c-hanging-comment-ender-p
-If this variable is @code{nil}, @code{c-fill-paragraph} leaves the
-comment terminator of a block comment on a line by itself. The default
-value is @code{t}, which puts the comment-end delimiter @samp{*/} at the
-end of the last line of the comment text.
-
-@item c-hanging-comment-starter-p
-@vindex c-hanging-comment-starter-p
-If this variable is @code{nil}, @code{c-fill-paragraph} leaves the
-starting delimiter of a block comment on a line by itself. The default
-value is @code{t}, which puts the comment-start delimiter @samp{/*} at
-the beginning of the first line of the comment text.
-@end table
-
@node Fortran
@section Fortran Mode
@cindex Fortran mode
@cindex Fortran77 and Fortran90
@findex f90-mode
@findex fortran-mode
- Fortan mode is meant for editing Fortran77 ``fixed format'' source
+ Fortran mode is meant for editing Fortran77 ``fixed format'' source
code. For editing the modern Fortran90 ``free format'' source code,
use F90 mode (@code{f90-mode}). Emacs normally uses Fortran mode for
files with extension @samp{.f}, @samp{.F} or @samp{.for}, and F90 mode
@code{fortran-comment-indent-char} to the single-character string you want
to use.
+@vindex fortran-directive-re
+ Compiler directive lines, or preprocessor lines, have much the same
+appearance as comment lines. It is important, though, that such lines
+never be indented at all, no matter what the value of
+@code{fortran-comment-indent-style}. The variable
+@code{fortran-directive-re} is a regular expression that specifies which
+lines are directives. Matching lines are never indented, and receive
+distinctive font-locking.
+
@vindex comment-line-start
@vindex comment-line-start-skip
Fortran mode introduces two variables @code{comment-line-start} and
The variable @code{asm-comment-char} specifies which character
starts comments in assembler syntax.
+
+@ignore
+ arch-tag: c7ee7409-40a4-45c7-bfb7-ae7f2c74d0c0
+@end ignore