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This is ../info/xemacs.info, produced by makeinfo version 4.0 from
xemacs/xemacs.texi.

INFO-DIR-SECTION XEmacs Editor
START-INFO-DIR-ENTRY
* XEmacs: (xemacs).             XEmacs Editor.
END-INFO-DIR-ENTRY

   This file documents the XEmacs editor.

   Copyright (C) 1985, 1986, 1988 Richard M. Stallman.  Copyright (C)
1991, 1992, 1993, 1994 Lucid, Inc.  Copyright (C) 1993, 1994 Sun
Microsystems, Inc.  Copyright (C) 1995 Amdahl Corporation.

   Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

   Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided also
that the sections entitled "The GNU Manifesto", "Distribution" and "GNU
General Public License" are included exactly as in the original, and
provided that the entire resulting derived work is distributed under the
terms of a permission notice identical to this one.

   Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that the sections entitled "The GNU Manifesto",
"Distribution" and "GNU General Public License" may be included in a
translation approved by the author instead of in the original English.

\1f
File: xemacs.info,  Node: TeX Print,  Prev: TeX Editing,  Up: TeX Mode

TeX Printing Commands
.....................

   You can invoke TeX as an inferior of Emacs on either the entire
contents of the buffer or just a region at a time.  Running TeX in this
way on just one chapter is a good way to see what your changes look
like without taking the time to format the entire file.

`C-c C-r'
     Invoke TeX on the current region, plus the buffer's header
     (`tex-region').

`C-c C-b'
     Invoke TeX on the entire current buffer (`tex-buffer').

`C-c C-l'
     Recenter the window showing output from the inferior TeX so that
     the last line can be seen (`tex-recenter-output-buffer').

`C-c C-k'
     Kill the inferior TeX (`tex-kill-job').

`C-c C-p'
     Print the output from the last `C-c C-r' or `C-c C-b' command
     (`tex-print').

`C-c C-q'
     Show the printer queue (`tex-show-print-queue').

   You can pass the current buffer through an inferior TeX using `C-c
C-b' (`tex-buffer').  The formatted output appears in a file in `/tmp';
to print it, type `C-c C-p' (`tex-print').  Afterward use `C-c C-q'
(`tex-show-print-queue') to view the progress of your output towards
being printed.

   The console output from TeX, including any error messages, appears
in a buffer called `*TeX-shell*'.  If TeX gets an error, you can switch
to this buffer and feed it input (this works as in Shell mode; *note
Interactive Shell::).  Without switching to this buffer, you can scroll
it so that its last line is visible by typing `C-c C-l'.

   Type `C-c C-k' (`tex-kill-job') to kill the TeX process if you see
that its output is no longer useful.  Using `C-c C-b' or `C-c C-r' also
kills any TeX process still running.

   You can pass an arbitrary region through an inferior TeX by typing
`C-c C-r' (`tex-region').  This is tricky, however, because most files
of TeX input contain commands at the beginning to set parameters and
define macros.  Without them, no later part of the file will format
correctly.  To solve this problem, `C-c C-r' allows you to designate a
part of the file as containing essential commands; it is included
before the specified region as part of the input to TeX.  The
designated part of the file is called the "header".

   To indicate the bounds of the header in Plain TeX mode, insert two
special strings in the file: `%**start of header' before the header,
and `%**end of header' after it.  Each string must appear entirely on
one line, but there may be other text on the line before or after.  The
lines containing the two strings are included in the header.  If
`%**start of header' does not appear within the first 100 lines of the
buffer, `C-c C-r' assumes there is no header.

   In LaTeX mode, the header begins with `\documentstyle' and ends with
`\begin{document}'.  These are commands that LaTeX requires you to use,
so you don't need to do anything special to identify the header.

   When you enter either kind of TeX mode, Emacs calls with no
arguments the value of the variable `text-mode-hook', if that value
exists and is not `nil'.  Emacs then calls the variable `TeX-mode-hook'
and either `plain-TeX-mode-hook' or `LaTeX-mode-hook' under the same
conditions.

\1f
File: xemacs.info,  Node: Outline Mode,  Prev: TeX Mode,  Up: Text Mode

Outline Mode
------------

   Outline mode is a major mode similar to Text mode but intended for
editing outlines.  It allows you to make parts of the text temporarily
invisible so that you can see just the overall structure of the
outline.  Type `M-x outline-mode' to turn on Outline mode in the
current buffer.

   When you enter Outline mode, Emacs calls with no arguments the value
of the variable `text-mode-hook', if that value exists and is not
`nil'; then it does the same with the variable `outline-mode-hook'.

   When a line is invisible in outline mode, it does not appear on the
screen.  The screen appears exactly as if the invisible line were
deleted, except that an ellipsis (three periods in a row) appears at
the end of the previous visible line (only one ellipsis no matter how
many invisible lines follow).

   All editing commands treat the text of the invisible line as part of
the previous visible line.  For example, `C-n' moves onto the next
visible line.  Killing an entire visible line, including its
terminating newline, really kills all the following invisible lines as
well; yanking everything back yanks the invisible lines and they remain
invisible.

* Menu:

* Format: Outline Format.         What the text of an outline looks like.
* Motion: Outline Motion.         Special commands for moving through outlines.
* Visibility: Outline Visibility. Commands to control what is visible.

\1f
File: xemacs.info,  Node: Outline Format,  Next: Outline Motion,  Prev: Outline Mode,  Up: Outline Mode

Format of Outlines
..................

   Outline mode assumes that the lines in the buffer are of two types:
"heading lines" and "body lines".  A heading line represents a topic in
the outline.  Heading lines start with one or more stars; the number of
stars determines the depth of the heading in the outline structure.
Thus, a heading line with one star is a major topic; all the heading
lines with two stars between it and the next one-star heading are its
subtopics; and so on.  Any line that is not a heading line is a body
line.  Body lines belong to the preceding heading line.  Here is an
example:

     * Food
     
     This is the body,
     which says something about the topic of food.
     
     ** Delicious Food
     
     This is the body of the second-level header.
     
     ** Distasteful Food
     
     This could have
     a body too, with
     several lines.
     
     *** Dormitory Food
     
     * Shelter
     
     A second first-level topic with its header line.

   A heading line together with all following body lines is called
collectively an "entry".  A heading line together with all following
deeper heading lines and their body lines is called a "subtree".

   You can customize the criterion for distinguishing heading lines by
setting the variable `outline-regexp'.  Any line whose beginning has a
match for this regexp is considered a heading line.  Matches that start
within a line (not at the beginning) do not count.  The length of the
matching text determines the level of the heading; longer matches make
a more deeply nested level.  Thus, for example, if a text formatter has
commands `@chapter', `@section' and `@subsection' to divide the
document into chapters and sections, you can make those lines count as
heading lines by setting `outline-regexp' to
`"@chap\\|@\\(sub\\)*section"'.  Note the trick: the two words
`chapter' and `section' are the same length, but by defining the regexp
to match only `chap' we ensure that the length of the text matched on a
chapter heading is shorter, so that Outline mode will know that
sections are contained in chapters.  This works as long as no other
command starts with `@chap'.

   Outline mode makes a line invisible by changing the newline before it
into an ASCII Control-M (code 015).  Most editing commands that work on
lines treat an invisible line as part of the previous line because,
strictly speaking, it is part of that line, since there is no longer a
newline in between.  When you save the file in Outline mode, Control-M
characters are saved as newlines, so the invisible lines become ordinary
lines in the file.  Saving does not change the visibility status of a
line inside Emacs.

\1f
File: xemacs.info,  Node: Outline Motion,  Next: Outline Visibility,  Prev: Outline Format,  Up: Outline Mode

Outline Motion Commands
.......................

   Some special commands in Outline mode move backward and forward to
heading lines.

`C-c C-n'
     Move point to the next visible heading line
     (`outline-next-visible-heading').

`C-c C-p'
     Move point to the previous visible heading line
     (`outline-previous-visible-heading').

`C-c C-f'
     Move point to the next visible heading line at the same level as
     the one point is on (`outline-forward-same-level').

`C-c C-b'
     Move point to the previous visible heading line at the same level
     (`outline-backward-same-level').

`C-c C-u'
     Move point up to a lower-level (more inclusive) visible heading
     line (`outline-up-heading').

   `C-c C-n' (`next-visible-heading') moves down to the next heading
line.  `C-c C-p' (`previous-visible-heading') moves similarly backward.
Both accept numeric arguments as repeat counts.  The names emphasize
that invisible headings are skipped, but this is not really a special
feature.  All editing commands that look for lines ignore the invisible
lines automatically.

   More advanced motion commands understand the levels of headings.
The commands `C-c C-f' (`outline-forward-same-level') and `C-c C-b'
(`outline-backward-same-level') move from one heading line to another
visible heading at the same depth in the outline.  `C-c C-u'
(`outline-up-heading') moves backward to another heading that is less
deeply nested.

\1f
File: xemacs.info,  Node: Outline Visibility,  Prev: Outline Motion,  Up: Outline Mode

Outline Visibility Commands
...........................

   The other special commands of outline mode are used to make lines
visible or invisible.  Their names all start with `hide' or `show'.
Most of them exist as pairs of opposites.  They are not undoable;
instead, you can undo right past them.  Making lines visible or
invisible is simply not recorded by the undo mechanism.

`M-x hide-body'
     Make all body lines in the buffer invisible.

`M-x show-all'
     Make all lines in the buffer visible.

`C-c C-d'
     Make everything under this heading invisible, not including this
     heading itself (`hide-subtree').

`C-c C-s'
     Make everything under this heading visible, including body,
     subheadings, and their bodies (`show-subtree').

`M-x hide-leaves'
     Make the body of this heading line, and of all its subheadings,
     invisible.

`M-x show-branches'
     Make all subheadings of this heading line, at all levels, visible.

`C-c C-i'
     Make immediate subheadings (one level down) of this heading line
     visible (`show-children').

`M-x hide-entry'
     Make this heading line's body invisible.

`M-x show-entry'
     Make this heading line's body visible.

   Two commands that are exact opposites are `M-x hide-entry' and `M-x
show-entry'.  They are used with point on a heading line, and apply
only to the body lines of that heading.  The subtopics and their bodies
are not affected.

   Two more powerful opposites are `C-c C-h' (`hide-subtree') and `C-c
C-s' (`show-subtree').  Both should be used when point is on a heading
line, and both apply to all the lines of that heading's "subtree": its
body, all its subheadings, both direct and indirect, and all of their
bodies.  In other words, the subtree contains everything following this
heading line, up to and not including the next heading of the same or
higher rank.

   Intermediate between a visible subtree and an invisible one is having
all the subheadings visible but none of the body.  There are two
commands for doing this, one that hides the bodies and one that makes
the subheadings visible.  They are `M-x hide-leaves' and `M-x
show-branches'.

   A little weaker than `show-branches' is `C-c C-i' (`show-children').
It makes just the direct subheadings visible--those one level down.
Deeper subheadings remain invisible.

   Two commands have a blanket effect on the whole file.  `M-x
hide-body' makes all body lines invisible, so that you see just the
outline structure.  `M-x show-all' makes all lines visible.  You can
think of these commands as a pair of opposites even though `M-x
show-all' applies to more than just body lines.

   You can turn off the use of ellipses at the ends of visible lines by
setting `selective-display-ellipses' to `nil'.  The result is no
visible indication of the presence of invisible lines.

\1f
File: xemacs.info,  Node: Words,  Next: Sentences,  Prev: Text Mode,  Up: Text

Words
=====

   Emacs has commands for moving over or operating on words.  By
convention, the keys for them are all `Meta-' characters.

`M-f'
     Move forward over a word (`forward-word').

`M-b'
     Move backward over a word (`backward-word').

`M-d'
     Kill up to the end of a word (`kill-word').

`M-<DEL>'
     Kill back to the beginning of a word (`backward-kill-word').

`M-@'
     Mark the end of the next word (`mark-word').

`M-t'
     Transpose two words;  drag a word forward or backward across other
     words (`transpose-words').

   Notice how these keys form a series that parallels the
character-based `C-f', `C-b', `C-d', `C-t' and <DEL>.  `M-@' is related
to `C-@', which is an alias for `C-<SPC>'.

   The commands `Meta-f' (`forward-word') and `Meta-b'
(`backward-word') move forward and backward over words.  They are
analogous to `Control-f' and `Control-b', which move over single
characters.  Like their `Control-' analogues, `Meta-f' and `Meta-b'
move several words if given an argument.  `Meta-f' with a negative
argument moves backward, and `Meta-b' with a negative argument moves
forward.  Forward motion stops after the last letter of the word, while
backward motion stops before the first letter.

   `Meta-d' (`kill-word') kills the word after point.  To be precise,
it kills everything from point to the place `Meta-f' would move to.
Thus, if point is in the middle of a word, `Meta-d' kills just the part
after point.  If some punctuation comes between point and the next
word, it is killed along with the word.  (To kill only the next word
but not the punctuation before it, simply type `Meta-f' to get to the
end and kill the word backwards with `Meta-<DEL>'.)  `Meta-d' takes
arguments just like `Meta-f'.

   `Meta-<DEL>' (`backward-kill-word') kills the word before point.  It
kills everything from point back to where `Meta-b' would move to.  If
point is after the space in `FOO, BAR', then `FOO, ' is killed.   To
kill just `FOO', type `Meta-b Meta-d' instead of `Meta-<DEL>'.

   `Meta-t' (`transpose-words') exchanges the word before or containing
point with the following word.  The delimiter characters between the
words do not move.  For example, transposing `FOO, BAR' results in
`BAR, FOO' rather than `BAR FOO,'.  *Note Transpose::, for more on
transposition and on arguments to transposition commands.

   To operate on the next N words with an operation which applies
between point and mark, you can either set the mark at point and then
move over the words, or you can use the command `Meta-@' (`mark-word')
which does not move point but sets the mark where `Meta-f' would move
to.  It can be given arguments just like `Meta-f'.

   The word commands' understanding of syntax is completely controlled
by the syntax table.  For example, any character can be declared to be
a word delimiter.  *Note Syntax::.

\1f
File: xemacs.info,  Node: Sentences,  Next: Paragraphs,  Prev: Words,  Up: Text

Sentences
=========

   The Emacs commands for manipulating sentences and paragraphs are
mostly on `Meta-' keys, and therefore are like the word-handling
commands.

`M-a'
     Move back to the beginning of the sentence (`backward-sentence').

`M-e'
     Move forward to the end of the sentence (`forward-sentence').

`M-k'
     Kill forward to the end of the sentence (`kill-sentence').

`C-x <DEL>'
     Kill back to the beginning of the sentence
     (`backward-kill-sentence').

   The commands `Meta-a' and `Meta-e' (`backward-sentence' and
`forward-sentence') move to the beginning and end of the current
sentence, respectively.  They resemble `Control-a' and `Control-e',
which move to the beginning and end of a line.  Unlike their
counterparts, `Meta-a' and `Meta-e' move over successive sentences if
repeated or given numeric arguments.  Emacs assumes the typist's
convention is followed, and thus considers a sentence to end wherever
there is a `.', `?', or `!' followed by the end of a line or two
spaces, with any number of `)', `]', `'', or `"' characters allowed in
between.  A sentence also begins or ends wherever a paragraph begins or
ends.

   Neither `M-a' nor `M-e' moves past the newline or spaces beyond the
sentence edge at which it is stopping.

   `M-a' and `M-e' have a corresponding kill command, just like `C-a'
and `C-e' have `C-k'.  The command is  `M-k' (`kill-sentence') which
kills from point to the end of the sentence.  With minus one as an
argument it kills back to the beginning of the sentence.  Larger
arguments serve as repeat counts.

   There is a special command, `C-x <DEL>' (`backward-kill-sentence'),
for killing back to the beginning of a sentence, which is useful when
you change your mind in the middle of composing text.

   The variable `sentence-end' controls recognition of the end of a
sentence.  It is a regexp that matches the last few characters of a
sentence, together with the whitespace following the sentence.  Its
normal value is:

     "[.?!][]\"')]*\\($\\|\t\\|  \\)[ \t\n]*"

This example is explained in the section on regexps.  *Note Regexps::.

\1f
File: xemacs.info,  Node: Paragraphs,  Next: Pages,  Prev: Sentences,  Up: Text

Paragraphs
==========

   The Emacs commands for manipulating paragraphs are also `Meta-' keys.

`M-['
     Move back to previous paragraph beginning
     (`backward-paragraph').

`M-]'
     Move forward to next paragraph end (`forward-paragraph').

`M-h'
     Put point and mark around this or next paragraph
     (`mark-paragraph').

   `Meta-[' moves to the beginning of the current or previous paragraph,
while `Meta-]' moves to the end of the current or next paragraph.
Blank lines and text formatter command lines separate paragraphs and are
not part of any paragraph.  An indented line starts a new paragraph.

   In major modes for programs (as opposed to Text mode), paragraphs
begin and end only at blank lines.  As a result, the paragraph commands
continue to be useful even though there are no paragraphs per se.

   When there is a fill prefix, paragraphs are delimited by all lines
which don't start with the fill prefix.  *Note Filling::.

   To operate on a paragraph, you can use the command `Meta-h'
(`mark-paragraph') to set the region around it.  This command puts
point at the beginning and mark at the end of the paragraph point was
in.  If point is between paragraphs (in a run of blank lines or at a
boundary), the paragraph following point is surrounded by point and
mark.  If there are blank lines preceding the first line of the
paragraph, one of the blank lines is included in the region.  Thus, for
example, `M-h C-w' kills the paragraph around or after point.

   The precise definition of a paragraph boundary is controlled by the
variables `paragraph-separate' and `paragraph-start'.  The value of
`paragraph-start' is a regexp that matches any line that either starts
or separates paragraphs.  The value of `paragraph-separate' is another
regexp that  matches only lines that separate paragraphs without being
part of any paragraph.  Lines that start a new paragraph and are
contained in it must match both regexps.  For example, normally
`paragraph-start' is `"^[ \t\n\f]"' and `paragraph-separate' is `"^[
\t\f]*$"'.

   Normally it is desirable for page boundaries to separate paragraphs.
The default values of these variables recognize the usual separator for
pages.

\1f
File: xemacs.info,  Node: Pages,  Next: Filling,  Prev: Paragraphs,  Up: Text

Pages
=====

   Files are often thought of as divided into "pages" by the "formfeed"
character (ASCII Control-L, octal code 014).  For example, if a file is
printed on a line printer, each "page" of the file starts on a new page
of paper.  Emacs treats a page-separator character just like any other
character.  It can be inserted with `C-q C-l' or deleted with <DEL>.
You are free to paginate your file or not.  However, since pages are
often meaningful divisions of the file, commands are provided to move
over them and operate on them.

`C-x ['
     Move point to previous page boundary (`backward-page').

`C-x ]'
     Move point to next page boundary (`forward-page').

`C-x C-p'
     Put point and mark around this page (or another page)
     (`mark-page').

`C-x l'
     Count the lines in this page (`count-lines-page').

   The `C-x [' (`backward-page') command moves point to immediately
after the previous page delimiter.  If point is already right after a
page delimiter, the command skips that one and stops at the previous
one.  A numeric argument serves as a repeat count.  The `C-x ]'
(`forward-page') command moves forward past the next page delimiter.

   The `C-x C-p' command (`mark-page') puts point at the beginning of
the current page and the mark at the end.  The page delimiter at the end
is included (the mark follows it).  The page delimiter at the front is
excluded (point follows it).  You can follow this command  by `C-w' to
kill a page you want to move elsewhere.  If you insert the page after a
page delimiter, at a place where `C-x ]' or `C-x [' would take you, the
page will be properly delimited before and after once again.

   A numeric argument to `C-x C-p' is used to specify which page to go
to, relative to the current one.  Zero means the current page.  One
means the next page, and -1 means the previous one.

   The `C-x l' command (`count-lines-page') can help you decide where
to break a page in two.  It prints the total number of lines in the
current page in the echo area, then divides the lines into those
preceding the current line and those following it, for example

     Page has 96 (72+25) lines

Notice that the sum is off by one; this is correct if point is not at
the beginning of a line.

   The variable `page-delimiter' should have as its value a regexp that
matches the beginning of a line that separates pages.  This defines
where pages begin.  The normal value of this variable is `"^\f"', which
matches a formfeed character at the beginning of a line.

\1f
File: xemacs.info,  Node: Filling,  Next: Case,  Prev: Pages,  Up: Text

Filling Text
============

   If you use Auto Fill mode, Emacs "fills" text (breaks it up into
lines that fit in a specified width) as you insert it.  When you alter
existing text it is often no longer be properly filled afterwards and
you can use explicit commands for filling.

* Menu:

* Auto Fill::     Auto Fill mode breaks long lines automatically.
* Fill Commands:: Commands to refill paragraphs and center lines.
* Fill Prefix::   Filling when every line is indented or in a comment, etc.

\1f
File: xemacs.info,  Node: Auto Fill,  Next: Fill Commands,  Prev: Filling,  Up: Filling

Auto Fill Mode
--------------

   "Auto Fill" mode is a minor mode in which lines are broken
automatically when they become too wide.  Breaking happens only when
you type a <SPC> or <RET>.

`M-x auto-fill-mode'
     Enable or disable Auto Fill mode.

`<SPC>'
`<RET>'
     In Auto Fill mode, break lines when appropriate.

   `M-x auto-fill-mode' turns Auto Fill mode on if it was off, or off
if it was on.  With a positive numeric argument the command always turns
Auto Fill mode on, and with a negative argument it always turns it off.
The presence of the word `Fill' in the mode line, inside the
parentheses, indicates that Auto Fill mode is in effect.  Auto Fill mode
is a minor mode; you can turn it on or off for each buffer individually.
*Note Minor Modes::.

   In Auto Fill mode, lines are broken automatically at spaces when
they get longer than desired.  Line breaking and rearrangement takes
place only when you type <SPC> or <RET>.  To insert a space or newline
without permitting line-breaking, type `C-q <SPC>' or `C-q <LFD>'
(recall that a newline is really a linefeed).  `C-o' inserts a newline
without line breaking.

   Auto Fill mode works well with Lisp mode: when it makes a new line in
Lisp mode, it indents that line with <TAB>.  If a line ending in a Lisp
comment gets too long, the text of the comment is split into two
comment lines.  Optionally, new comment delimiters are inserted at the
end of the first line and the beginning of the second, so that each line
is a separate comment.  The variable `comment-multi-line' controls the
choice (*note Comments::).

   Auto Fill mode does not refill entire paragraphs.  It can break
lines but cannot merge lines.  Editing in the middle of a paragraph can
result in a paragraph that is not correctly filled.  The easiest way to
make the paragraph properly filled again is using an explicit fill
commands.

   Many users like Auto Fill mode and want to use it in all text files.
The section on init files explains how you can arrange this permanently
for yourself.  *Note Init File::.

\1f
File: xemacs.info,  Node: Fill Commands,  Next: Fill Prefix,  Prev: Auto Fill,  Up: Filling

Explicit Fill Commands
----------------------

`M-q'
     Fill current paragraph (`fill-paragraph').

`M-g'
     Fill each paragraph in the region (`fill-region').

`C-x f'
     Set the fill column (`set-fill-column').

`M-x fill-region-as-paragraph'
     Fill the region, considering it as one paragraph.

`M-s'
     Center a line.

   To refill a paragraph, use the command `Meta-q' (`fill-paragraph').
It causes the paragraph containing point, or the one after point if
point is between paragraphs, to be refilled.  All line breaks are
removed, and new ones are inserted where necessary.  `M-q' can be
undone with `C-_'.  *Note Undo::.

   To refill many paragraphs, use `M-g' (`fill-region'), which divides
the region into paragraphs and fills each of them.

   `Meta-q' and `Meta-g' use the same criteria as `Meta-h' for finding
paragraph boundaries (*note Paragraphs::).  For more control, you can
use `M-x fill-region-as-paragraph', which refills everything between
point and mark.  This command recognizes only blank lines as paragraph
separators.

   A numeric argument to `M-g' or `M-q' causes it to "justify" the text
as well as filling it.  Extra spaces are inserted to make the right
margin line up exactly at the fill column.  To remove the extra spaces,
use `M-q' or `M-g' with no argument.

   The variable `auto-fill-inhibit-regexp' takes as a value a regexp to
match lines that should not be auto-filled.

   The command `Meta-s' (`center-line') centers the current line within
the current fill column.  With an argument, it centers several lines
individually and moves past them.

   The maximum line width for filling is in the variable `fill-column'.
Altering the value of `fill-column' makes it local to the current
buffer; until then, the default value--initially 70--is in effect.
*Note Locals::.

   The easiest way to set `fill-column' is to use the command `C-x f'
(`set-fill-column').  With no argument, it sets `fill-column' to the
current horizontal position of point.  With a numeric argument, it uses
that number as the new fill column.

\1f
File: xemacs.info,  Node: Fill Prefix,  Prev: Fill Commands,  Up: Filling

The Fill Prefix
---------------

   To fill a paragraph in which each line starts with a special marker
(which might be a few spaces, giving an indented paragraph), use the
"fill prefix" feature.  The fill prefix is a string which is not
included in filling.  Emacs expects every line to start with a fill
prefix.

`C-x .'
     Set the fill prefix (`set-fill-prefix').

`M-q'
     Fill a paragraph using current fill prefix (`fill-paragraph').

`M-x fill-individual-paragraphs'
     Fill the region, considering each change of indentation as
     starting a new paragraph.

   To specify a fill prefix, move to a line that starts with the desired
prefix, put point at the end of the prefix, and give the command
`C-x .' (`set-fill-prefix').  That's a period after the `C-x'.  To turn
off the fill prefix, specify an empty prefix: type `C-x .' with point
at the beginning of a line.

   When a fill prefix is in effect, the fill commands remove the fill
prefix from each line before filling and insert it on each line after
filling.  Auto Fill mode also inserts the fill prefix inserted on new
lines it creates.  Lines that do not start with the fill prefix are
considered to start paragraphs, both in `M-q' and the paragraph
commands; this is just right if you are using paragraphs with hanging
indentation (every line indented except the first one).  Lines which are
blank or indented once the prefix is removed also separate or start
paragraphs; this is what you want if you are writing multi-paragraph
comments with a comment delimiter on each line.

   The fill prefix is stored in the variable `fill-prefix'.  Its value
is a string, or `nil' when there is no fill prefix.  This is a
per-buffer variable; altering the variable affects only the current
buffer, but there is a default value which you can change as well.
*Note Locals::.

   Another way to use fill prefixes is through `M-x
fill-individual-paragraphs'.  This function divides the region into
groups of consecutive lines with the same amount and kind of
indentation and fills each group as a paragraph, using its indentation
as a fill prefix.

\1f
File: xemacs.info,  Node: Case,  Prev: Filling,  Up: Text

Case Conversion Commands
========================

   Emacs has commands for converting either a single word or any
arbitrary range of text to upper case or to lower case.

`M-l'
     Convert following word to lower case (`downcase-word').

`M-u'
     Convert following word to upper case (`upcase-word').

`M-c'
     Capitalize the following word (`capitalize-word').

`C-x C-l'
     Convert region to lower case (`downcase-region').

`C-x C-u'
     Convert region to upper case (`upcase-region').

   The word conversion commands are used most frequently.  `Meta-l'
(`downcase-word') converts the word after point to lower case, moving
past it.  Thus, repeating `Meta-l' converts successive words.  `Meta-u'
(`upcase-word') converts to all capitals instead, while `Meta-c'
(`capitalize-word') puts the first letter of the word into upper case
and the rest into lower case.  The word conversion commands convert
several words at once if given an argument.  They are especially
convenient for converting a large amount of text from all upper case to
mixed case: you can move through the text using `M-l', `M-u', or `M-c'
on each word as appropriate, occasionally using `M-f' instead to skip a
word.

   When given a negative argument, the word case conversion commands
apply to the appropriate number of words before point, but do not move
point.  This is convenient when you have just typed a word in the wrong
case: you can give the case conversion command and continue typing.

   If a word case conversion command is given in the middle of a word,
it applies only to the part of the word which follows point.  This is
just like what `Meta-d' (`kill-word') does.  With a negative argument,
case conversion applies only to the part of the word before point.

   The other case conversion commands are `C-x C-u' (`upcase-region')
and `C-x C-l' (`downcase-region'), which convert everything between
point and mark to the specified case.  Point and mark do not move.

\1f
File: xemacs.info,  Node: Programs,  Next: Running,  Prev: Text,  Up: Top

Editing Programs
****************

   Emacs has many commands designed to understand the syntax of
programming languages such as Lisp and C.  These commands can:

   * Move over or kill balanced expressions or "sexps" (*note Lists::).

   * Move over or mark top-level balanced expressions ("defuns", in
     Lisp; functions, in C).

   * Show how parentheses balance (*note Matching::).

   * Insert, kill, or align comments (*note Comments::).

   * Follow the usual indentation conventions of the language (*note
     Grinding::).

   The commands available for words, sentences, and paragraphs are
useful in editing code even though their canonical application is for
editing human language text.  Most symbols contain words (*note
Words::); sentences can be found in strings and comments (*note
Sentences::).  Paragraphs per se are not present in code, but the
paragraph commands are useful anyway, because Lisp mode and C mode
define paragraphs to begin and end at blank lines (*note Paragraphs::).
Judicious use of blank lines to make the program clearer also provides
interesting chunks of text for the paragraph commands to work on.

   The selective display feature is useful for looking at the overall
structure of a function (*note Selective Display::).  This feature
causes only the lines that are indented less than a specified amount to
appear on the screen.

* Menu:

* Program Modes::       Major modes for editing programs.
* Lists::               Expressions with balanced parentheses.
                         There are editing commands to operate on them.
* Defuns::              Each program is made up of separate functions.
                         There are editing commands to operate on them.
* Grinding::            Adjusting indentation to show the nesting.
* Matching::            Insertion of a close-delimiter flashes matching open.
* Comments::            Inserting, illing and aligning comments.
* Balanced Editing::    Inserting two matching parentheses at once, etc.
* Lisp Completion::     Completion on symbol names in Lisp code.
* Documentation::       Getting documentation of functions you plan to call.
* Change Log::          Maintaining a change history for your program.
* Tags::                Go direct to any function in your program in one
                         command.  Tags remembers which file it is in.
* Fortran::             Fortran mode and its special features.
* Asm Mode::            Asm mode and its special features.

\1f
File: xemacs.info,  Node: Program Modes,  Next: Lists,  Prev: Programs,  Up: Programs

Major Modes for Programming Languages
=====================================

   Emacs has several major modes for the programming languages Lisp,
Scheme (a variant of Lisp), C, Fortran, and Muddle.  Ideally, a major
mode should be implemented for each programming language you might want
to edit with Emacs; but often the mode for one language can serve for
other syntactically similar languages.  The language modes that exist
are those that someone decided to take the trouble to write.

   There are several variants of Lisp mode, which differ in the way they
interface to Lisp execution.  *Note Lisp Modes::.

   Each of the programming language modes defines the <TAB> key to run
an indentation function that knows the indentation conventions of that
language and updates the current line's indentation accordingly.  For
example, in C mode <TAB> is bound to `c-indent-line'.  <LFD> is
normally defined to do <RET> followed by <TAB>; thus it, too, indents
in a mode-specific fashion.

   In most programming languages, indentation is likely to vary from
line to line.  So the major modes for those languages rebind <DEL> to
treat a tab as if it were the equivalent number of spaces (using the
command `backward-delete-char-untabify').  This makes it possible to
rub out indentation one column at a time without worrying whether it is
made up of spaces or tabs.  In these modes, use `C-b C-d' to delete a
tab character before point.

   Programming language modes define paragraphs to be separated only by
blank lines, so that the paragraph commands remain useful.  Auto Fill
mode, if enabled in a programming language major mode, indents the new
lines which it creates.

   Turning on a major mode calls a user-supplied function called the
"mode hook", which is the value of a Lisp variable.  For example,
turning on C mode calls the value of the variable `c-mode-hook' if that
value exists and is non-`nil'.  Mode hook variables for other
programming language modes include `lisp-mode-hook',
`emacs-lisp-mode-hook', `lisp-interaction-mode-hook',
`scheme-mode-hook', and `muddle-mode-hook'.  The mode hook function
receives no arguments.

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File: xemacs.info,  Node: Lists,  Next: Defuns,  Prev: Program Modes,  Up: Programs

Lists and Sexps
===============

   By convention, Emacs keys for dealing with balanced expressions are
usually `Control-Meta-' characters.  They tend to be analogous in
function to their `Control-' and `Meta-' equivalents.  These commands
are usually thought of as pertaining to expressions in programming
languages, but can be useful with any language in which some sort of
parentheses exist (including English).

   The commands fall into two classes.  Some commands deal only with
"lists" (parenthetical groupings).  They see nothing except
parentheses, brackets, braces (depending on what must balance in the
language you are working with), and escape characters that might be used
to quote those.

   The other commands deal with expressions or "sexps".  The word `sexp'
is derived from "s-expression", the term for a symbolic expression in
Lisp.  In Emacs, the notion of `sexp' is not limited to Lisp.  It
refers to an expression in the language  your program is written in.
Each programming language has its own major mode, which customizes the
syntax tables so that expressions in that language count as sexps.

   Sexps typically include symbols, numbers, and string constants, as
well as anything contained in parentheses, brackets, or braces.

   In languages that use prefix and infix operators, such as C, it is
not possible for all expressions to be sexps.  For example, C mode does
not recognize `foo + bar' as an sexp, even though it is a C expression;
it recognizes `foo' as one sexp and `bar' as another, with the `+' as
punctuation between them.  This is a fundamental ambiguity: both `foo +
bar' and `foo' are legitimate choices for the sexp to move over if
point is at the `f'.  Note that `(foo + bar)' is a sexp in C mode.

   Some languages have obscure forms of syntax for expressions that
nobody has bothered to make Emacs understand properly.

`C-M-f'
     Move forward over an sexp (`forward-sexp').

`C-M-b'
     Move backward over an sexp (`backward-sexp').

`C-M-k'
     Kill sexp forward (`kill-sexp').

`C-M-u'
     Move up and backward in list structure (`backward-up-list').

`C-M-d'
     Move down and forward in list structure (`down-list').

`C-M-n'
     Move forward over a list (`forward-list').

`C-M-p'
     Move backward over a list (`backward-list').

`C-M-t'
     Transpose expressions (`transpose-sexps').

`C-M-@'
     Put mark after following expression (`mark-sexp').

   To move forward over an sexp, use `C-M-f' (`forward-sexp').  If the
first significant character after point is an opening delimiter (`(' in
Lisp; `(', `[', or `{' in C), `C-M-f' moves past the matching closing
delimiter.  If the character begins a symbol, string, or number,
`C-M-f' moves over that.  If the character after point is a closing
delimiter, `C-M-f' just moves past it.  (This last is not really moving
across an sexp; it is an exception which is included in the definition
of `C-M-f' because it is as useful a behavior as anyone can think of
for that situation.)

   The command `C-M-b' (`backward-sexp') moves backward over a sexp.
The detailed rules are like those above for `C-M-f', but with
directions reversed.  If there are any prefix characters (single quote,
back quote, and comma, in Lisp) preceding the sexp, `C-M-b' moves back
over them as well.

   `C-M-f' or `C-M-b' with an argument repeats that operation the
specified number of times; with a negative argument, it moves in the
opposite direction.

   In languages such as C where the comment-terminator can be
recognized, the sexp commands move across comments as if they were
whitespace.  In Lisp and other languages where comments run until the
end of a line, it is very difficult to ignore comments when parsing
backwards; therefore, in such languages the sexp commands treat the
text of comments as if it were code.

   Killing an sexp at a time can be done with `C-M-k' (`kill-sexp').
`C-M-k' kills the characters that `C-M-f' would move over.

   The "list commands", `C-M-n' (`forward-list') and `C-M-p'
(`backward-list'), move over lists like the sexp commands but skip over
any number of other kinds of sexps (symbols, strings, etc).  In some
situations, these commands are useful because they usually ignore
comments, since the comments usually do not contain any lists.

   `C-M-n' and `C-M-p' stay at the same level in parentheses, when that
is possible.  To move up one (or N) levels, use `C-M-u'
(`backward-up-list').  `C-M-u' moves backward up past one unmatched
opening delimiter.  A positive argument serves as a repeat count; a
negative argument reverses direction of motion and also requests
repetition, so it moves forward and up one or more levels.

   To move down in list structure, use `C-M-d' (`down-list').  In Lisp
mode, where `(' is the only opening delimiter, this is nearly the same
as searching for a `('.  An argument specifies the number of levels of
parentheses to go down.

   `C-M-t' (`transpose-sexps') drags the previous sexp across the next
one.  An argument serves as a repeat count, and a negative argument
drags backwards (thus canceling out the effect of `C-M-t' with a
positive argument).  An argument of zero, rather than doing nothing,
transposes the sexps ending after point and the mark.

   To make the region be the next sexp in the buffer, use `C-M-@'
(`mark-sexp') which sets the mark at the same place that `C-M-f' would
move to.  `C-M-@' takes arguments like `C-M-f'.  In particular, a
negative argument is useful for putting the mark at the beginning of
the previous sexp.

   The list and sexp commands' understanding of syntax is completely
controlled by the syntax table.  Any character can, for example, be
declared to be an opening delimiter and act like an open parenthesis.
*Note Syntax::.

\1f
File: xemacs.info,  Node: Defuns,  Next: Grinding,  Prev: Lists,  Up: Programs

Defuns
======

   In Emacs, a parenthetical grouping at the top level in the buffer is
called a "defun".  The name derives from the fact that most top-level
lists in Lisp are instances of the special form `defun', but Emacs
calls any top-level parenthetical grouping counts a defun regardless of
its contents or the programming language.  For example, in C, the body
of a function definition is a defun.

`C-M-a'
     Move to beginning of current or preceding defun
     (`beginning-of-defun').

`C-M-e'
     Move to end of current or following defun (`end-of-defun').

`C-M-h'
     Put region around whole current or following defun (`mark-defun').

   The commands to move to the beginning and end of the current defun
are `C-M-a' (`beginning-of-defun') and `C-M-e' (`end-of-defun').

   To operate on the current defun, use `C-M-h' (`mark-defun') which
puts point at the beginning and the mark at the end of the current or
next defun.  This is the easiest way to prepare for moving the defun to
a different place.  In C mode, `C-M-h' runs the function
`mark-c-function', which is almost the same as `mark-defun', but which
backs up over the argument declarations, function name, and returned
data type so that the entire C function is inside the region.

   To compile and evaluate the current defun, use `M-x compile-defun'.
This function prints the results in the minibuffer. If you include an
argument, it inserts the value in the current buffer after the defun.

   Emacs assumes that any open-parenthesis found in the leftmost column
is the start of a defun.  Therefore, never put an open-parenthesis at
the left margin in a Lisp file unless it is the start of a top level
list.  Never put an open-brace or other opening delimiter at the
beginning of a line of C code unless it starts the body of a function.
The most likely problem case is when you want an opening delimiter at
the start of a line inside a string.  To avoid trouble, put an escape
character (`\' in C and Emacs Lisp, `/' in some other Lisp dialects)
before the opening delimiter.  It will not affect the contents of the
string.

   The original Emacs found defuns by moving upward a level of
parentheses until there were no more levels to go up.  This required
scanning back to the beginning of the buffer for every function.  To
speed this up, Emacs was changed to assume that any `(' (or other
character assigned the syntactic class of opening-delimiter) at the
left margin is the start of a defun.  This heuristic is nearly always
right; however, it mandates the convention described above.

\1f
File: xemacs.info,  Node: Grinding,  Next: Matching,  Prev: Defuns,  Up: Programs

Indentation for Programs
========================

   The best way to keep a program properly indented ("ground") is to
use Emacs to re-indent it as you change the program.  Emacs has commands
to indent properly either a single line, a specified number of lines, or
all of the lines inside a single parenthetical grouping.

* Menu:

* Basic Indent::
* Multi-line Indent::   Commands to reindent many lines at once.
* Lisp Indent::         Specifying how each Lisp function should be indented.
* C Indent::            Choosing an indentation style for C code.

\1f
File: xemacs.info,  Node: Basic Indent,  Next: Multi-line Indent,  Prev: Grinding,  Up: Grinding

Basic Program Indentation Commands
----------------------------------

`<TAB>'
     Adjust indentation of current line.

`<LFD>'
     Equivalent to <RET> followed by <TAB> (`newline-and-indent').

   The basic indentation command is <TAB>, which gives the current line
the correct indentation as determined from the previous lines.  The
function that <TAB> runs depends on the major mode; it is
`lisp-indent-line' in Lisp mode, `c-indent-line' in C mode, etc.  These
functions understand different syntaxes for different languages, but
they all do about the same thing.  <TAB> in any programming language
major mode inserts or deletes whitespace at the beginning of the
current line, independent of where point is in the line.  If point is
inside the whitespace at the beginning of the line, <TAB> leaves it at
the end of that whitespace; otherwise, <TAB> leaves point fixed with
respect to the characters around it.

   Use `C-q <TAB>' to insert a tab at point.

   When entering a large amount of new code, use <LFD>
(`newline-and-indent'), which is equivalent to a <RET> followed by a
<TAB>.  <LFD> creates a blank line, then gives it the appropriate
indentation.

   <TAB> indents the second and following lines of the body of a
parenthetical grouping each under the preceding one; therefore, if you
alter one line's indentation to be nonstandard, the lines below tend to
follow it.  This is the right behavior in cases where the standard
result of <TAB> does not look good.

   Remember that Emacs assumes that an open-parenthesis, open-brace, or
other opening delimiter at the left margin (including the indentation
routines) is the start of a function.  You should therefore never have
an opening delimiter in column zero that is not the beginning of a
function, not even inside a string.  This restriction is vital for
making the indentation commands fast. *Note Defuns::, for more
information on this behavior.

\1f
File: xemacs.info,  Node: Multi-line Indent,  Next: Lisp Indent,  Prev: Basic Indent,  Up: Grinding

Indenting Several Lines
-----------------------

   Several commands are available to re-indent several lines of code
which have been altered or moved to a different level in a list
structure.

`C-M-q'
     Re-indent all the lines within one list (`indent-sexp').

`C-u <TAB>'
     Shift an entire list rigidly sideways so that its first line is
     properly indented.

`C-M-\'
     Re-indent all lines in the region (`indent-region').

   To re-indent the contents of a single list, position point before the
beginning of it and type `C-M-q'. This key is bound to `indent-sexp' in
Lisp mode, `indent-c-exp' in C mode, and bound to other suitable
functions in other modes.  The indentation of the line the sexp starts
on is not changed; therefore, only the relative indentation within the
list, and not its position, is changed.  To correct the position as
well, type a <TAB> before `C-M-q'.

   If the relative indentation within a list is correct but the
indentation of its beginning is not, go to the line on which the list
begins and type `C-u <TAB>'.  When you give <TAB> a numeric argument,
it moves all the lines in the group, starting on the current line,
sideways the same amount that the current line moves.  The command does
not move lines that start inside strings, or C preprocessor lines when
in C mode.

   Another way to specify a range to be re-indented is with point and
mark.  The command `C-M-\' (`indent-region') applies <TAB> to every
line whose first character is between point and mark.