aephea-base(7) MISCELLANEOUS aephea-base(7)
NAME
aephea-base - a description of Aephea base definitions
The macros in this package have been ported to both html and troff.
DESCRIPTION
aephea-base - A description of Aephea base definitions. The macros in
this package have been ported to both html and troff. This package is
used by the Aephea simpledocument class and by the Portable Unix Docu-
mentation (pud) mini-languages for authoring manual pages (pud-man) and
the pud language for faq authoring (pud-faq).
There is a small list of known issues in the ISSUES section, mostly con-
cerning the troff device. These should generally be of no concern at
all, but if you run into trouble look there first. A quick glance
through the list before you run into trouble may be the wisest thing to
do.
INTRODUCTION TO THE ITEMIZE ENVIRONMENT
The itemize environemnt is the Aephea workhorse for lists, enumerations,
itemizations, and other tailed creatures. A simple and valid use is for
example
\begin{itemize}
\item{\bf{foo}}
\car{
For I am foo.
}
\items{
{\bf{barra}}
{\bf{zuttelezut}}
}
\car{
For we are bar and zut.
}
\end{itemize}
This source result in the following output:
foo
For I am foo.
barra
zuttelezut
For we are bar and zut.
This is not impressive at all, but it gives an idea of how itemize
works. The following example is a single itemize environment providing
a rollercoasterride through most of the features of the itemize environ-
ment. As shown below, it is possible to change all the itemize settings
and styles at will even within a single itemize instance. Of course this
is not useful at all except for demonstrating the itemize capabilities,
but it goes to show that the itemize macros are quite robust (by virtue
of modularity).
NOTE
The entire listing below was put in Aephea's spacing environment,
described further below. The environment was used to create extra mar-
gins on the two sides.
1 Spacing modes compact and cascade are determined by the key
flow. The current mode is compact, meaning that the itemize
token and the ensuing text are on the same line. Below, compact
mode is switched off (approximately) halfway. The interitem key
determines the amount skipped between an item description and
the next item.
2 Several item modes (custom, mark, enumeration).
3 Several enumeration modes (roman, arabic, alphabetic).
iv) The style of a list can be changed while in the middle of it.
v) Nuther item.
vi) The list can be 'interupted' and resumed (by means of the
\intermezzo#1 macro).
Perhaps you wonder what good is THAT for, and justly so. The
\intermezzo#1 macro should only be used inbetween different items,
i.e. it should not split content belonging to a single item.
[7] Items can be optionally and automatically right and/or left delim-
ited. The current item is delimited with square brackets.
[8] Items can be left or right aligned.
[9] Items can be stacked, which is supported only when flow is set to
cascade.
[10]
Beginning with this item, flow is set to cascade.
Implying
That
Stacking
is now possible.
[12]
(back to right-align) The itemcounter just keeps running by the way.
[18] (back to compact) But the counter can be manipulated at will.
o A bullet item.
o Now interitem is set to 0 (affecting the current list), and a new
list is started contiguous to the present text (by having its
margintop set to 0).
a. Hubris
b. Laziness
c. Impatience
Are the three virtues of programming.
o This concludes a listing showing most of the itemize capabilities.
USING THE ITEMIZE ENVIRONMENT
You steer the itemize environment by providing it with tag-value pairs
like so:
\begin{itemize}{
{flow}{compact}
{interitem}{1}
{align}{right}
{type}{abc}
{rp}{.}
}
This is the list of tags that you may use.
margintop
Top of table, anomalous unit (ems), default 0.
interitem
Paragraph skip in ems inbetween items, default 0.
flow
Set to compact or cascade
textindent
Width of text indent in ems.
itemmargin
Width of item margin in ems (for right-aligned items).
mark
E.g. \*{itembullet} (if type=mark), affects \item.
align
One of left or right (item alignment), default left.
class_all
class name assigned to all block-level elements
lp
What's printed immediately to the left of an item.
rp
What's printed immediately to the right of an item.
type
One of mark, roman, abc, arabic, affects \item.
itemcount
The count of items seen so far, e.g. 13 right now.
You need to know that the itemize environment internally maps these tags
to dollar keys simply by prepending a dollar. Thus, if you want to
reset one of the values associated with such a tag, you need to do e.g.
\set{$align}{right}
\set{$itemcount}{30}
A more robust to do this is to ensure that the modified key is retrieved
from the right dictionary, i.e. the top-level itemize dictionary, as
follows.
\set{{dict}{itemize}}{$align}{right}
\set{{dict}{itemize}}{$itemcount}{30}
THE SPACING ENVIRONMENT
Its syntax is identical to that of the itemize environment. It accepts
tags left, right, top, and bottom. These should receive numeric values.
The associated unit is em.
The troff device does not yet support the top and bottom tags.
MACROS
\enref#2
\iref#2
\lref#2
\aref#2
\httpref#1
\sibref#1
\sibref#2
\sibref#3
\enref#2 creates a link for which the first argument is the anchor and
for which the second argument is the content (which can be left
empty). \iref#2 takes such an anchor as the first argument and it
takes content that carries the link as the second argument. \lref#2
takes a file name (possibly including a relative or absolute path) as
the first argument and content as the second argument. \aref#2 takes a
URL (later possibly a URI) as the first argument and content as the
second argument. \sibref#2 takes a label as argument which presumably
is the name of some application. It may append an extension depending
on the current device, and it assumes that label + extension is the
name of a file in the current directory. The second argument is dis-
played in the text. For \sibref#1 the displayed text is the same as
the label. For \sibref#3 the second argument is an additional anchor
within the file being linked to, and the third argument is the dis-
played text. \httpref#1 simply prints a URL which will be active when
html is output.
\par#1
\cpar#2
\car#1
\ccar#2
These are all paragraph macros that carry the paragraph content as the
last argument. The first argument of \cpar#2 and \ccar#2 is the cap-
tion. These macros will ensure well-formedness for devices that sup-
port it, such as html. Use \car#1 where you don't need a paragraph
skip, but just need to indicate that you are in text mode again. You
can simply always use \par#1 and never use \car#1. If you care about
the details of spacing though, or if you have particular trouble for
example in creating an itemize environment where you do not want top
and bottom margins, then it could be worthwile to turn to \car#1.
Examples for using \car#1 are:
o After an environment that always carries a bottom margin.
o After an environment that does not carry a bottom margin, and where
you specifically want the environment to be contiguous to the
enclosing text. The listing you are currently reading is an example
of this.
As promised. The \car macro may feel a little unusual. If you don't
mind standing the chance of a little spurious vertical white-space
just use \par all the time. If you really need it, such as in an
'inline' listing as above, the \car macro is ready to do the job.
\bf#1
\it#1
\tt#1
\v#1
\ftinc#2
\ftdec#2
The first four items set their argument in the font specified. \tt#1
and \v#1 both denote a typewriter font. These macros should not be
nested if troff is to be among the output devices. Support for the
last two items is not yet very robust. They temporarily increment
respectively decrement the font by the amount of the first argument
and apply the resulting setting to the second argument.
\verbatim#1
\verbatix#1
Make the device output the contents verbatim in a mono-spaced font,
obeying spaces and newlines. This does not prohibit expansion of
macros, use \protect#1 for that. The macro \verbatim#1 will create a
non-breaking environment.
ISSUES
Nesting
Do not nest \bf#1, \it#1, \tt#1, or \v#1 macros if troff is among the
output devices. It will yield unexpected results.
The rest of this list pertains to the itemize environment.
Margins
Do not use fractional values for textindent and itemmargin in the item-
ize environment, if troff is among the output devices. The reason is
that the Aephea macros use the difference between these two values and
pass them on to the output devices. Troff rounds all values it gets and
thus the additive relationship between the values may be lost.
aephea-base 1.002, 10-008 8 Jan 2010 aephea-base(7)
