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Quotations and Examples

Quotations and examples are blocks of text consisting of one or more whole paragraphs that are set off from the bulk of the text and treated differently. They are usually indented.

In Texinfo, you always begin a quotation or example by writing an @-command at the beginning of a line by itself, and end it by writing an @end command that is also at the beginning of a line by itself. For instance, you begin an example by writing @example by itself at the beginning of a line and end the example by writing @end example on a line by itself, at the beginning of that line.

The Block Enclosing Commands

Here are commands for quotations and examples:

@quotation
Indicate text that is quoted. The text is filled, indented, and printed in a roman font by default.
@example
Illustrate code, commands, and the like. The text is printed in a fixed-width font, and indented but not filled.
@lisp
Illustrate Lisp code. The text is printed in a fixed-width font, and indented but not filled.
@smallexample
Illustrate code, commands, and the like. Similar to @example, except that in TeX this command typesets text in a smaller font for the smaller @smallbook format than for the 8.5 by 11 inch format.
@smalllisp
Illustrate Lisp code. Similar to @lisp, except that in TeX this command typesets text in a smaller font for the smaller @smallbook format than for the 8.5 by 11 inch format.
@display
Display illustrative text. The text is indented but not filled, and no font is specified (so, by default, the font is roman).
@format
Print illustrative text. The text is not indented and not filled and no font is specified (so, by default, the font is roman).

The @exdent command is used within the above constructs to undo the indentation of a line.

The @flushleft and @flushright commands are used to line up the left or right margins of unfilled text.

The @noindent command may be used after one of the above constructs to prevent the following text from being indented as a new paragraph.

You can use the @cartouche command within one of the above constructs to highlight the example or quotation by drawing a box with rounded corners around it. (The @cartouche command affects only the printed manual; it has no effect in the Info file; see section Drawing Cartouches Around Examples.)

@quotation

The text of a quotation is processed normally except that:

This is an example of text written between an @quotation command and an @end quotation command. An @quotation command is most often used to indicate text that is excerpted from another (real or hypothetical) printed work.

Write an @quotation command as text on a line by itself. This line will disappear from the output. Mark the end of the quotation with a line beginning with and containing only @end quotation. The @end quotation line will likewise disappear from the output. Thus, the following, 

@quotation
This is
a foo.
@end quotation

produces

This is a foo.

@example

The @example command is used to indicate an example that is not part of the running text, such as computer input or output. 

This is an example of text written between an
@example command
and an @end example command.
The text is indented but not filled.

In the printed manual, the text is typeset in a
fixed-width font, and extra spaces and blank lines are
significant.  In the Info file, an analogous result is
obtained by indenting each line with five spaces.

Write an @example command at the beginning of a line by itself. This line will disappear from the output. Mark the end of the example with an @end example command, also written at the beginning of a line by itself. The @end example will disappear from the output.

For example, 

@example
mv foo bar
@end example

produces 

mv foo bar

Since the lines containing @example and @end example will disappear, you should put a blank line before the @example and another blank line after the @end example. (Remember that blank lines between the beginning @example and the ending @end example will appear in the output.)

Caution: Do not use tabs in the lines of an example (or anywhere else in Texinfo, for that matter)! TeX treats tabs as single spaces, and that is not what they look like. This is a problem with TeX. (If necessary, in Emacs, you can use M-x untabify to convert tabs in a region to multiple spaces.)

Examples are often, logically speaking, "in the middle" of a paragraph, and the text continues after an example should not be indented. The @noindent command prevents a piece of text from being indented as if it were a new paragraph.

(The @code command is used for examples of code that are embedded within sentences, not set off from preceding and following text. See section @code{sample-code}.)

@noindent

An example or other inclusion can break a paragraph into segments. Ordinarily, the formatters indent text that follows an example as a new paragraph. However, you can prevent this by writing @noindent at the beginning of a line by itself preceding the continuation text.

For example: 

@example
This is an example
@end example

@noindent
This line is not indented.  As you can see, the
beginning of the line is fully flush left with the line
that follows after it.  (This whole example is between
@code{@@display} and @code{@@end display}.)

produces 



This is an example



This line is not indented.  As you can see, the
beginning of the line is fully flush left with the line
that follows after it.  (This whole example is between
@display and @end display.)

To adjust the number of blank lines properly in the Info file output, remember that the line containing @noindent does not generate a blank line, and neither does the @end example line.

In the Texinfo source file for this manual, each line that says `produces' is preceded by a line containing @noindent.

Do not put braces after an @noindent command; they are not necessary, since @noindent is a command used outside of paragraphs (see section @-Command Syntax).

@lisp

The @lisp command is used for Lisp code. It is synonymous with the @example command. 

This is an example of text written between an
@lisp command and an @end lisp command.

Use @lisp instead of @example to preserve information regarding the nature of the example. This is useful, for example, if you write a function that evaluates only and all the Lisp code in a Texinfo file. Then you can use the Texinfo file as a Lisp library.(8)

Mark the end of @lisp with @end lisp on a line by itself.

@smallexample and @smalllisp

In addition to the regular @example and @lisp commands, Texinfo has two other "example-style" commands. These are the @smallexample and @smalllisp commands. Both these commands are designed for use with the @smallbook command that causes TeX to produce a printed manual in a 7 by 9.25 inch format rather than the regular 8.5 by 11 inch format.

In TeX, the @smallexample and @smalllisp commands typeset text in a smaller font for the smaller @smallbook format than for the 8.5 by 11 inch format. Consequently, many examples containing long lines fit in a narrower, @smallbook page without needing to be shortened. Both commands typeset in the normal font size when you format for the 8.5 by 11 inch size; indeed, in this situation, the @smallexample and @smalllisp commands are defined to be the @example and @lisp commands.

In Info, the @smallexample and @smalllisp commands are equivalent to the @example and @lisp commands, and work exactly the same.

Mark the end of @smallexample or @smalllisp with @end smallexample or @end smalllisp, respectively.

Here is an example written in the small font used by the @smallexample and @smalllisp commands: 





The @smallexample and @smalllisp commands make it
easier to prepare smaller format manuals without forcing you to edit
examples by hand to fit them onto narrower pages.




As a general rule, a printed document looks better if you write all the
examples in a chapter consistently in @example or in
@smallexample.  Only occasionally should you mix the two
formats.




See section Printing "Small" Books, for more information
about the @smallbook command.





@display










The @display command begins a kind of example.  It is like the
@example command
except that, in
a printed manual, @display does not select the fixed-width
font.  In fact, it does not specify the font at all, so that the text
appears in the same font it would have appeared in without the
@display command.




This is an example of text written between an @display command
and an @end display command.  The @display command
indents the text, but does not fill it.






@format









The @format command is similar to @example except
that, in the printed manual, @format does not select the
fixed-width font and does not narrow the margins.




This is an example of text written between an @format command
and an @end format command.  As you can see
from this example,
the @format command does not fill the text.






@exdent: Undoing a Line's Indentation










The @exdent command removes any indentation a line might have.
The command is written at the beginning of a line and applies only to
the text that follows the command that is on the same line.  Do not use
braces around the text.  In a printed manual, the text on an
@exdent line is printed in the roman font.




@exdent is usually used within examples.  Thus,




@example
This line follows an @@example command.
@exdent This line is exdented.
This line follows the exdented line.
The @@end example comes on the next line.
@end group





produces





This line follows an @example command.
This line is exdented.
This line follows the exdented line.
The @end example comes on the next line.





In practice, the @exdent command is rarely used.
Usually, you un-indent text by ending the example and
returning the page to its normal width.





@flushleft and @flushright










The @flushleft and @flushright commands line up the
ends of lines on the left and right margins of a page,
but do not fill the text.  The commands are written on lines of their
own, without braces.  The @flushleft and @flushright
commands are ended by @end flushleft and @end
flushright commands on lines of their own.




For example,





@flushleft
This text is
written flushleft.
@end flushleft





produces








This text is
written flushleft.








@flushright produces the type of indentation often used in the
return address of letters.  For example,





@flushright
Here is an example of text written
flushright.  The @code{@flushright} command
right justifies every line but leaves the
left end ragged.
@end flushright





produces





Here is an example of text written
flushright.  The @flushright command
right justifies every line but leaves the
left end ragged.






Drawing Cartouches Around Examples










In a printed manual, the @cartouche command draws a box with
rounded corners around its contents.  You can use this command to
further highlight an example or quotation.  For instance, you could
write a manual in which one type of example is surrounded by a cartouche
for emphasis.




The @cartouche command affects only the printed manual; it has
no effect in the Info file.




For example,





@example
@cartouche
% pwd
/usr/local/share/emacs
@end cartouche
@end example





surrounds the two-line example with a box with rounded corners, in the
printed manual.





In a printed manual, the example looks like this:




% pwd
/usr/local/lib/emacs/info






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