par(1) USER COMMANDS par(1)NAMEpar - filter for reformatting paragraphs
SYNOPSISpar [ help ] [ version ] [ Bopset ] [ Popset ] [ Qopset ] [ h[hang] ]
[ p[prefix] ] [ r[repeat] ] [ s[suffix] ] [ T[Tab] ] [ w[width] ]
[ b[body] ] [ c[cap] ] [ d[div] ] [ E[Err] ] [ e[expel] ]
[ f[fit] ] [ g[guess] ] [ j[just] ] [ l[last] ] [ q[quote] ]
[ R[Report] ] [ t[touch] ]
DESCRIPTIONpar is a filter which copies its input to its output, changing all
white characters (except newlines) to spaces, and reformatting each
paragraph. Paragraphs are separated by protected, blank, and bodiless
lines (see the TERMINOLOGY section for definitions), and optionally
delimited by indentation (see the d option in the OPTIONS section).
Each output paragraph is generated from the corresponding input para‐
graph as follows:
1) An optional prefix and/or suffix is removed from each input
line.
2) The remainder is divided into words (separated by spaces).
3) The words are joined into lines to make an eye-pleasing para‐
graph.
4) The prefixes and suffixes are reattached.
If there are suffixes, spaces are inserted before them so that they all
end in the same column.
QUICK STARTpar is necessarily complex. For those who wish to use it immediately
and understand it later, assign the PARINIT environment variable the
following value:
rTbgqR B=.,?_A_a Q=_s>|
The spaces, question mark, greater-than sign, and vertical bar will
probably have to be escaped or quoted to prevent your shell from inter‐
preting them.
The documentation, though precise, is unfortunately not well-written
for the end-user. Your best bet is probably to read quickly the
DESCRIPTION, TERMINOLOGY, OPTIONS, and ENVIRONMENT sections, then read
carefully the EXAMPLES section, referring back to the OPTIONS and TER‐
MINOLOGY sections as needed.
For the "power user", a full understanding of par will require multiple
readings of the TERMINOLOGY, OPTIONS, DETAILS, and EXAMPLES sections.
TERMINOLOGY
Miscellaneous terms:
charset syntax
A way of representing a set of characters as a string.
The set includes exactly those characters which appear in
the string, except that the underscore (_) is an escape
character. Whenever it appears, it must begin one of the
following escape sequences:
__ = an underscore
_s = a space
_b = a backslash (\)
_q = a single quote (')
_Q = a double quote (")
_A = all upper case letters
_a = all lower case letters
_0 = all decimal digits
_xhh = the character represented by the two hexadecimal
digits hh (which may be upper or lower case)
The NUL character must not appear in the string, but it
may be included in the set with the _x00 sequence.
error A condition which causes par to abort. See the DIAGNOS‐
TICS section.
IP Input paragraph.
OP Output paragraph.
parameter
A symbol which may take on unsigned integral values.
There are several parameters whose values affect the
behavior of par. Parameters can be assigned values using
command line options.
Types of characters:
alphanumeric character
An upper case letter, lower case letter, or decimal
digit.
body character
A member of the set of characters defined by the PARBODY
environment variable (see the ENVIRONMENT section) and/or
the B option (see the OPTIONS section).
protective character
A member of the set of characters defined by the PARPRO‐
TECT environment variable and/or the P option.
quote character
A member of the set of characters defined by the PARQUOTE
environment variable and/or the Q option.
terminal character
A period, question mark, exclamation point, or colon.
white character
A space, formfeed, newline, carriage return, tab, or ver‐
tical tab.
Functions:
comprelen
Given a non-empty sequence S of lines, let c be their
longest common prefix. If the parameter body is 0, place
a divider just after the leading non-body characters in c
(at the beginning if there are none). If body is 1,
place the divider just after the last non-space non-body
character in c (at the beginning if there is none), then
advance the divider over any immediately following spa‐
ces. The comprelen of S is the number of characters pre‐
ceeding the divider.
comsuflen
Given a non-empty sequence S of lines, let p be the com‐
prelen of S. Let T be the set of lines which result from
stripping the first p characters from each line in S.
Let c be the longest common suffix of the lines in T. If
body is 0, place a divider just before the trailing non-
body characters in c (at the end if there are none), then
advance the divider over all but the last of any immedi‐
ately following spaces. If body is 1, place the divider
just before the first non-space non-body character, then
back up the divider over one immediately preceeding space
if there is one. The comsuflen of S is the number of
characters following the divider.
fallback prelen (suflen)
The fallback prelen (suflen) of an IP is: the comprelen
(comsuflen) of the IP, if the IP contains at least two
lines; otherwise, the comprelen (comsuflen) of the block
containing the IP, if the block contains at least two
lines; otherwise, the length of the longer of the pre‐
fixes (suffixes) of the bodiless lines just above and
below the block, if the segment containing the block has
any bodiless lines; otherwise, 0. (See below for the
definitions of block, segment, and bodiless line.)
augmented fallback prelen
Let fp be the fallback prelen of an IP. If the IP con‐
tains more than one line, or if quote is 0, then the aug‐
mented fallback prelen of the IP is simply fp. Other‐
wise, it is fp plus the number of quote characters imme‐
diately following the first fp characters of the line.
quoteprefix
The quoteprefix of a line is the longest string of quote
characters appearing at the beginning of the line, after
this string has been stripped of any trailing spaces.
Types of lines:
blank line
An empty line, or a line whose first character is not
protective and which contains only spaces.
protected line
An input line whose first character is protective.
bodiless line
A line which is order k bodiless for some k.
order k bodiless line
There is no such thing as an order 0 bodiless line. Sup‐
pose S is a a contiguous subsequence of a segment (see
below) containing at least two lines, containing no order
k-1 bodiless lines, bounded above and below by order k-1
bodiless lines and/or the beginning/end of the segment.
Let p and s be the comprelen and comsuflen of S. Any
member of S which, if stripped of its first p and last s
characters, would be blank (or, if the parameter repeat
is non-zero, would consist of the same character repeated
at least repeat times), is order k bodiless. The first p
characters of the bodiless line comprise its prefix; the
last s characters comprise its suffix. The character
which repeats in the middle is called its repeat charac‐
ter. If the middle is empty, the space is taken to be
its repeat character.
vacant line
A bodiless line whose repeat character is the space.
superfluous line
Only blank and vacant lines may be superfluous. If con‐
tiguous vacant lines lie at the beginning or end of a
segment, they are all superfluous. But if they lie
between two non-vacant lines within a segment, then all
are superfluous except one—the one which contains the
fewest non-spaces. In case of a tie, the first of the
tied lines is chosen. Similarly, if contiguous blank
lines lie outside of any segments at the beginning or end
of the input, they are all superfluous. But if they lie
between two segments and/or protected lines, then all are
superfluous except the first.
Groups of lines:
segment
A contiguous sequence of input lines containing no pro‐
tected or blank lines, bounded above and below by pro‐
tected lines, blank lines, and/or the beginning/end of
the input.
block A contiguous subsequence of a segment containing no bodi‐
less lines, bounded above and below by bodiless lines
and/or the beginning/end of the segment.
Types of words:
capitalized word
If the parameter cap is 0, a capitalized word is one
which contains at least one alphanumeric character, whose
first alphanumeric character is not a lower case letter.
If cap is 1, every word is considered a capitalized word.
(See the c option in the OPTIONS section.)
curious word
A word which contains a terminal character c such that
there are no alphanumeric characters in the word after c,
but there is at least one alphanumeric character in the
word before c.
OPTIONS
Any command line argument may begin with one minus sign (-) which is
ignored. Generally, more than one option may appear in a single com‐
mand line argument, but there are exceptions: The help, version, B, P,
and Q options must have whole arguments all to themselves.
help Causes all remaining arguments to be ignored. No input is
read. A usage message is printed on the output briefly
describing the options used by par.
version Causes all remaining arguments to be ignored. No input is
read. "par 1.52" is printed on the output. Of course, this
will change in future releases of Par.
Bopset op is a single character, either an equal sign (=), a plus
sign (+), or a minus sign (-), and set is a string using
charset syntax. If op is an equal sign, the set of body
characters is set to the character set defined by set. If op
is a plus/minus sign, the characters in the set defined by
set are added/removed to/from the existing set of body char‐
acters defined by the PARBODY environment variable and any
previous B options. It is okay to add characters that are
already in the set or to remove characters that are not in
the set.
Popset Just like the B option, except that it applies to the set of
protective characters.
Qopset Just like the B option, except that it applies to the set of
quote characters.
All remaining options are used to set values of parameters. Values set
by command line options hold for all paragraphs. Unset parameters are
given default values. Any parameters whose default values depend on
the IP (namely prefix and suffix), if left unset, are recomputed sepa‐
rately for each paragraph.
The approximate role of each variable is described here. See the
DETAILS section for the rest of the story.
The first six parameters, hang, prefix, repeat, suffix, Tab, and width,
may be set to any unsigned decimal integer less than 10000.
h[hang] Mainly affects the default values of prefix and suffix.
Defaults to 0. If the h option is given without a number,
the value 1 is inferred. (See also the p and s options.)
p[prefix] The first prefix characters of each line of the OP are copied
from the first prefix characters of the corresponding line of
the IP. If there are more than hang+1 lines in the IP, the
default value is the comprelen of all the lines in the IP
except the first hang of them. Otherwise, the default value
is the augmented fallback prelen of the IP. If the p option
is given without a number, prefix is unset, even if it had
been set earlier. (See also the h and q options.)
r[repeat] If repeat is non-zero, bodiless lines have the number of
instances of their repeat characters increased or decreased
until the length of the line is width. The exact value of
repeat affects the definition of bodiless line. Defaults to
0. If the r option is given without a number, the value 3 is
inferred. (See also the w option.)
s[suffix] The last suffix characters of each line of the OP are copied
from the last suffix characters of the corresponding line of
the IP. If there are more than hang+1 lines in the IP, the
default value is the comsuflen of all the lines of the IP
except the first hang of them. Otherwise, the default value
is the fallback suflen of the IP. If the s option is given
without a number, suffix is unset, even if it had been set
earlier. (See also the h option.)
T[Tab] Tab characters in the input are expanded to spaces, assuming
tab stops every Tab columns. Must not be 0. Defaults to 1.
If the T option is given without a number, the value 8 is
inferred.
w[width] No line in the OP may contain more than width characters, not
including the trailing newlines. Defaults to 72. If the w
option is given without a number, the value 79 is inferred.
The remaining thirteen parameters, body, cap, div, Err, expel, fit,
guess, invis, just, last, quote, Report, and touch, may be set to
either 0 or 1. If the number is absent in the option, the value 1 is
inferred.
b[body] If body is 1, prefixes may not contain any trailing body
characters, and suffixes may not contain any leading body
characters. (Actually, the situation is complicated by space
characters. See comprelen and comsuflen in the Terminology
section.) If body is 0, prefixes and suffixes may not con‐
tain any body characters at all. Defaults to 0.
c[cap] If cap is 1, all words are considered capitalized. This cur‐
rently affects only the application of the g option.
Defaults to 0.
d[div] If div is 0, each block becomes an IP. If div is 1, each
block is subdivided into IPs as follows: Let p be the com‐
prelen of the block. Let a line's status be 1 if its (p+1)st
character is a space, 0 otherwise. Every line in the block
whose status is the same as the status of the first line will
begin a new paragraph. Defaults to 0.
E[Err] If Err is 1, messages to the user (caused by the help and
version options, or by errors) are sent to the error stream
instead of the output stream. Defaults to 0.
e[expel] If expel is 1, superfluous lines are withheld from the out‐
put. Defaults to 0.
f[fit] If fit is 1 and just is 0, par tries to make the lines in the
OP as nearly the same length as possible, even if it means
making the OP narrower. Defaults to 0. (See also the j
option.)
g[guess] If guess is 1, then when par is choosing line breaks, when‐
ever it encounters a curious word followed by a capitalized
word, it takes one of two special actions. If the two words
are separated by a single space in the input, they will be
merged into one word with an embedded non-breaking space. If
the two words are separated by more than one space, or by a
line break, par will insure that they are separated by two
spaces, or by a line break, in the output. Defaults to 0.
i[invis] If invis is 1, then vacant lines inserted because quote is 1
are invisible; that is, they are not output. If quote is 0,
invis has no effect. Defaults to 0. (See also the q
option.)
j[just] If just is 1, par justifies the OP, inserting spaces between
words so that all lines in the OP have length width (except
the last, if last is 0). Defaults to 0. (See also the w, l,
and f options.)
l[last] If last is 1, par tries to make the last line of the OP about
the same length as the others. Defaults to 0.
q[quote] If quote is 1, then before each segment is scanned for bodi‐
less lines, par supplies vacant lines between different quo‐
tation nesting levels as follows: For each pair of adjacent
lines in the segment, (scanned from the top down) which have
different quoteprefixes, one of two actions is taken. If
invis is 0, and either line consists entirely of quote char‐
acters and spaces (or is empty), that line is truncated to
the longest common prefix of the two lines (both are trun‐
cated if both qualify). Otherwise, a line consisting of the
longest common prefix of the two lines is inserted between
them. quote also affects the default value of prefix.
Defaults to 0. (See also the p and i options.)
R[Report] If Report is 1, it is considered an error for an input word
to contain more than L = (width - prefix - suffix) charac‐
ters. Otherwise, such words are chopped after each Lth char‐
acter into shorter words. Defaults to 0.
t[touch] Has no effect if suffix is 0 or just is 1. Otherwise, if
touch is 0, all lines in the OP have length width. If touch
is 1, the length of the lines is decreased until the suffixes
touch the body of the OP. Defaults to the logical OR of fit
and last. (See also the s, j, w, f, and l options.)
If an argument begins with a number, that number is assumed to belong
to a p option if it is 8 or less, and to a w option otherwise.
If the value of any parameter is set more than once, the last value is
used. When unset parameters are assigned default values, hang and
quote are assigned before prefix, and fit and last are assigned before
touch (because of the dependencies).
It is an error if width <= prefix + suffix.
ENVIRONMENT
PARBODY Determines the initial set of body characters (which are used
for determining comprelens and comsuflens), using charset
syntax. If PARBODY is not set, the set of body characters is
initially empty.
PARINIT If set, par will read command line options from PARINIT
before it reads them from the command line. Within the value
of PARINIT, arguments are separated by white characters.
PARPROTECT
Determines the set of protective characters, using charset
syntax. If PARPROTECT is not set, the set of protective
characters is initially empty.
PARQUOTE Determines the set of quote characters, using charset syntax.
If PARQUOTE is not set, the set of quote characters initially
contains only the greater-than sign (>) and the space.
If a NUL character appears in the value of an environment variable, it
and the rest of the string will not be seen by par.
Note that the PARINIT variable, together with the B, P, and Q options,
renders the other environment variables unnecessary. They are included
for backward compatibility.
DETAILS
Lines are terminated by newline characters, but the newlines are not
considered to be included in the lines. If the last character of the
input is a non-newline, a newline will be inferred immediately after it
(but if the input is empty, no newline will be inferred; the number of
input lines will be 0). Thus, the input can always be viewed as a
sequence of lines.
Protected lines are copied unchanged from the input to the output. All
other input lines, as they are read, have any NUL characters removed,
and every white character (except newlines) turned into a space. Actu‐
ally, each tab character is turned into Tab - (n % Tab) spaces, where n
is the number of characters preceeding the tab character on the line
(evaluated after earlier tab characters have been expanded).
Blank lines in the input are transformed into empty lines in the out‐
put.
If repeat is 0, all bodiless lines are vacant, and they are all simply
stripped of trailing spaces before being output. If repeat is not 0,
only vacant lines whose suffixes have length 0 are treated that way;
other bodiless lines have the number of instances of their repeat char‐
acters increased or decreased until the length of the line is width.
If expel is 1, superfluous lines are not output. If quote and invis
are both 1, there may be invisible lines; they are not output.
The input is divided into segments, which are divided into blocks,
which are divided into IPs. The exact process depends on the values of
quote and div (see q and d in the OPTIONS section). The remainder of
this section describes the process which is applied independently to
each IP to construct the corresponding OP.
After the values of the parameters are determined (see the OPTIONS sec‐
tion), the first prefix characters and the last suffix characters of
each input line are removed and remembered. It is an error for any
line to contain fewer than prefix + suffix characters.
The remaining text is treated as a sequence of characters, not lines.
The text is broken into words, which are separated by spaces. That is,
a word is a maximal sub-sequence of non-spaces. If guess is 1, some
words might be merged (see g in the OPTIONS section). The first word
includes any spaces that preceed it on the same line.
Let L = width - prefix - suffix.
If Report is 0, some words may get chopped up at this point (see R in
the OPTIONS section).
The words are reassembled, preserving their order, into lines. If just
is 0, adjacent words within a line are separated by a single space, (or
sometimes two if guess is 1), and line breaks are chosen so that the
paragraph satisfies the following properties:
1) No line contains more than L characters.
2) If fit is 1, the difference between the lengths of the short‐
est and longest lines is as small as possible.
3) The shortest line is as long as possible, subject to proper‐
ties 1 and 2.
4) Let target be L if fit is 0, or the length of the longest
line if fit is 1. The sum of the squares of the differences
between target and the lengths of the lines is as small as
possible, subject to properties 1, 2, and 3.
If last is 0, the last line does not count as a line for the pur‐
poses of properties 2, 3, and 4 above.
If all the words fit on a single line, the properties as worded
above don't make much sense. In that case, no line breaks are
inserted.
If just is 1, adjacent words within a line are separated by one space
(or sometimes two if guess is 1) plus zero or more extra spaces. The
value of fit is disregarded, and line breaks are chosen so that the
paragraph satisfies the following properties:
1) Every line contains exactly L characters.
2) The largest inter-word gap is as small as possible, subject
to property 1. (An inter-word gap consists only of the extra
spaces, not the regular spaces.)
3) The sum of the squares of the lengths of the inter-word gaps
is as small as possible, subject to properties 1 and 2.
If last is 0, the last line does not count as a line for the pur‐
poses of property 1, and it does not require or contain any extra
spaces.
Extra spaces are distributed as uniformly as possible among the
inter-word gaps in each line.
In a justified paragraph, every line must contain at least two
words, but that's not always possible to accomplish. If the para‐
graph cannot be justified, it is considered an error.
If the number of lines in the resulting paragraph is less than hang,
empty lines are added at the end to bring the number of lines up to
hang.
If just is 0 and touch is 1, L is changed to be the length of the long‐
est line.
If suffix is not 0, each line is padded at the end with spaces to bring
its length up to L.
To each line is prepended prefix characters. Let n be the number of
lines in the IP, let afp be the augmented fallback prelen of the IP,
and let fs be the fallback suflen of the IP. The characters which are
prepended to the ith line are chosen as follows:
1) If i <= n, the characters are copied from the ones that were
removed from the beginning of the nth input line.
2) If i > n > hang, the characters are copied from the ones that
were removed from the beginning of the last input line.
3) If i > n and n <= hang, the first min(afp,prefix) of the charac‐
ters are copied from the ones that were removed from the begin‐
ning of the last input line, and the rest are all spaces.
Then to each line is appended suffix characters. The characters which
are appended to the ith line are chosen as follows:
1) If i <= n, the characters are copied from the ones that were
removed from the end of the nth input line.
2) If i > n > hang, the characters are copied from the ones that
were removed from the end of the last input line.
3) If i > n and n <= hang, the first min(fs,suffix) of the charac‐
ters are copied from the ones that were removed from the begin‐
ning of the last input line, and the rest are all spaces.
Finally, the lines are printed to the output as the OP.
DIAGNOSTICS
If there are no errors, par returns EXIT_SUCCESS (see <stdlib.h>).
If there is an error, an error message will be printed to the output,
and par will return EXIT_FAILURE. If the error is local to a single
paragraph, the preceeding paragraphs will have been output before the
error was detected. Line numbers in error messages are local to the IP
in which the error occurred. All error messages begin with
"par error:" on a line by itself. Error messages concerning command
line or environment variable syntax are accompanied by the same usage
message that the help option produces.
Of course, trying to print an error message would be futile if an error
resulted from an output function, so par doesn't bother doing any error
checking on output functions.
EXAMPLES
The superiority of par's dynamic programming algorithm over a greedy
algorithm (such as the one used by fmt) can be seen in the following
example:
Original paragraph (note that each line begins with 8 spaces):
We the people of the United States,
in order to form a more perfect union,
establish justice,
insure domestic tranquility,
provide for the common defense,
promote the general welfare,
and secure the blessing of liberty
to ourselves and our posterity,
do ordain and establish the Constitution
of the United States of America.
After a greedy algorithm with width = 39:
We the people of the United
States, in order to form a more
perfect union, establish
justice, insure domestic
tranquility, provide for the
common defense, promote the
general welfare, and secure the
blessing of liberty to
ourselves and our posterity, do
ordain and establish the
Constitution of the United
States of America.
After "par 39":
We the people of the United
States, in order to form a
more perfect union, establish
justice, insure domestic
tranquility, provide for the
common defense, promote the
general welfare, and secure
the blessing of liberty to
ourselves and our posterity,
do ordain and establish the
Constitution of the United
States of America.
The line breaks chosen by par are clearly more eye-pleasing.
par is most useful in conjunction with the text-filtering features of
an editor, such as the ! commands of vi. You may wish to add the fol‐
lowing lines to your .exrc file:
" use Bourne shell for speed:
set shell=/bin/sh
"
" reformat paragraph with no arguments:
map ** {!}par^M}
"
" reformat paragraph with arguments:
map *^V {!}par
Note that the leading spaces must be removed, and that what is shown as
^M and ^V really need to be ctrl-M and ctrl-V. Also note that the last
map command contains two spaces following the ctrl-V, plus one at the
end of the line.
To reformat a simple paragraph delimited by blank lines in vi, you can
put the cursor anywhere in it and type "**" (star star). If you need to
supply arguments to par, you can type "* " (star space) instead, then
type the arguments.
The rest of this section is a series of before-and-after pictures show‐
ing some typical uses of par. In all cases, no environment variables
are set.
Before:
/* We the people of the United States, */
/* in order to form a more perfect union, */
/* establish justice, */
/* insure domestic tranquility, */
/* provide for the common defense, */
/* promote the general welfare, */
/* and secure the blessing of liberty */
/* to ourselves and our posterity, */
/* do ordain and establish the Constitution */
/* of the United States of America. */
After "par 59":
/* We the people of the United States, in */
/* order to form a more perfect union, establish */
/* justice, insure domestic tranquility, provide */
/* for the common defense, promote the general */
/* welfare, and secure the blessing of liberty */
/* to ourselves and our posterity, do ordain */
/* and establish the Constitution of the United */
/* States of America. */
Or after "par 59f":
/* We the people of the United States, */
/* in order to form a more perfect union, */
/* establish justice, insure domestic */
/* tranquility, provide for the common */
/* defense, promote the general welfare, */
/* and secure the blessing of liberty to */
/* ourselves and our posterity, do ordain */
/* and establish the Constitution of the */
/* United States of America. */
Or after "par 59l":
/* We the people of the United States, in */
/* order to form a more perfect union, establish */
/* justice, insure domestic tranquility, */
/* provide for the common defense, promote */
/* the general welfare, and secure the */
/* blessing of liberty to ourselves and our */
/* posterity, do ordain and establish the */
/* Constitution of the United States of America. */
Or after "par 59lf":
/* We the people of the United States, */
/* in order to form a more perfect union, */
/* establish justice, insure domestic */
/* tranquility, provide for the common */
/* defense, promote the general welfare, */
/* and secure the blessing of liberty */
/* to ourselves and our posterity, do */
/* ordain and establish the Constitution */
/* of the United States of America. */
Or after "par 59lft0":
/* We the people of the United States, */
/* in order to form a more perfect union, */
/* establish justice, insure domestic */
/* tranquility, provide for the common */
/* defense, promote the general welfare, */
/* and secure the blessing of liberty */
/* to ourselves and our posterity, do */
/* ordain and establish the Constitution */
/* of the United States of America. */
Or after "par 59j":
/* We the people of the United States, in */
/* order to form a more perfect union, establish */
/* justice, insure domestic tranquility, provide */
/* for the common defense, promote the general */
/* welfare, and secure the blessing of liberty */
/* to ourselves and our posterity, do ordain and */
/* establish the Constitution of the United */
/* States of America. */
Or after "par 59jl":
/* We the people of the United States, */
/* in order to form a more perfect */
/* union, establish justice, insure domestic */
/* tranquility, provide for the common defense, */
/* promote the general welfare, and secure */
/* the blessing of liberty to ourselves and */
/* our posterity, do ordain and establish the */
/* Constitution of the United States of America. */
Before:
Preamble We the people of the United States,
to the US in order to form
Constitution a more perfect union,
establish justice,
insure domestic tranquility,
provide for the common defense,
promote the general welfare,
and secure the blessing of liberty
to ourselves and our posterity,
do ordain and establish
the Constitution
of the United States of America.
After "par 52h3":
Preamble We the people of the United
to the US States, in order to form a
Constitution more perfect union, establish
justice, insure domestic
tranquility, provide for the
common defense, promote the
general welfare, and secure
the blessing of liberty to
ourselves and our posterity,
do ordain and establish the
Constitution of the United
States of America.
Before:
1 We the people of the United States,
2 in order to form a more perfect union,
3 establish justice,
4 insure domestic tranquility,
5 provide for the common defense,
6 promote the general welfare,
7 and secure the blessing of liberty
8 to ourselves and our posterity,
9 do ordain and establish the Constitution
10 of the United States of America.
After "par 59p12l":
1 We the people of the United States, in order to
2 form a more perfect union, establish justice,
3 insure domestic tranquility, provide for the
4 common defense, promote the general welfare,
5 and secure the blessing of liberty to ourselves
6 and our posterity, do ordain and establish the
7 Constitution of the United States of America.
Before:
> > We the people
> > of the United States,
> > in order to form a more perfect union,
> > establish justice,
> > ensure domestic tranquility,
> > provide for the common defense,
>
> Promote the general welfare,
> and secure the blessing of liberty
> to ourselves and our posterity,
> do ordain and establish
> the Constitution of the United States of America.
After "par 52":
> > We the people of the United States, in
> > order to form a more perfect union,
> > establish justice, ensure domestic
> > tranquility, provide for the common
> > defense,
>
> Promote the general welfare, and secure
> the blessing of liberty to ourselves and
> our posterity, do ordain and establish
> the Constitution of the United States of
> America.
Before:
> We the people
> of the United States,
> in order to form a more perfect union,
> establish justice,
> ensure domestic tranquility,
> provide for the common defense,
> Promote the general welfare,
> and secure the blessing of liberty
> to ourselves and our posterity,
> do ordain and establish
> the Constitution of the United States of America.
After "par 52d":
> We the people of the United States,
> in order to form a more perfect union,
> establish justice, ensure domestic
> tranquility, provide for the common
> defense,
> Promote the general welfare, and secure
> the blessing of liberty to ourselves and
> our posterity, do ordain and establish
> the Constitution of the United States of
> America.
Before:
# 1. We the people of the United States.
# 2. In order to form a more perfect union.
# 3. Establish justice, ensure domestic
# tranquility.
# 4. Provide for the common defense
# 5. Promote the general welfare.
# 6. And secure the blessing of liberty
# to ourselves and our posterity.
# 7. Do ordain and establish the Constitution.
# 8. Of the United States of America.
After "par 37p13dh":
# 1. We the people of the
# United States.
# 2. In order to form a more
# perfect union.
# 3. Establish justice,
# ensure domestic
# tranquility.
# 4. Provide for the common
# defense
# 5. Promote the general
# welfare.
# 6. And secure the blessing
# of liberty to ourselves
# and our posterity.
# 7. Do ordain and establish
# the Constitution.
# 8. Of the United States of
# America.
Before:
/*****************************************/
/* We the people of the United States, */
/* in order to form a more perfect union, */
/* establish justice, insure domestic */
/* tranquility, */
/* */
/* */
/* [ provide for the common defense, ] */
/* [ promote the general welfare, ] */
/* [ and secure the blessing of liberty ] */
/* [ to ourselves and our posterity, ] */
/* [ ] */
/* */
/* do ordain and establish the Constitution */
/* of the United States of America. */
/******************************************/
After "par 42r":
/********************************/
/* We the people of the */
/* United States, in order to */
/* form a more perfect union, */
/* establish justice, insure */
/* domestic tranquility, */
/* */
/* */
/* [ provide for the common ] */
/* [ defense, promote the ] */
/* [ general welfare, and ] */
/* [ secure the blessing of ] */
/* [ liberty to ourselves ] */
/* [ and our posterity, ] */
/* [ ] */
/* */
/* do ordain and establish the */
/* Constitution of the United */
/* States of America. */
/********************************/
Or after "par 42re":
/********************************/
/* We the people of the */
/* United States, in order to */
/* form a more perfect union, */
/* establish justice, insure */
/* domestic tranquility, */
/* */
/* [ provide for the common ] */
/* [ defense, promote the ] */
/* [ general welfare, and ] */
/* [ secure the blessing of ] */
/* [ liberty to ourselves ] */
/* [ and our posterity, ] */
/* */
/* do ordain and establish the */
/* Constitution of the United */
/* States of America. */
/********************************/
Before:
Joe Public writes:
> Jane Doe writes:
> >
> >
> > I can't find the source for uncompress.
> Oh no, not again!!!
>
>
> Isn't there a FAQ for this?
>
>
That wasn't very helpful, Joe. Jane,
just make a link from uncompress to compress.
After "par 40q":
Joe Public writes:
> Jane Doe writes:
>
>
> > I can't find the source for
> > uncompress.
>
> Oh no, not again!!!
>
>
> Isn't there a FAQ for this?
>
That wasn't very helpful, Joe.
Jane, just make a link from
uncompress to compress.
Or after "par 40qe":
Joe Public writes:
> Jane Doe writes:
>
> > I can't find the source for
> > uncompress.
>
> Oh no, not again!!!
>
> Isn't there a FAQ for this?
That wasn't very helpful, Joe.
Jane, just make a link from
uncompress to compress.
Or after "par 40qi":
Joe Public writes:
> Jane Doe writes:
> >
> >
> > I can't find the source for
> > uncompress.
> Oh no, not again!!!
>
>
> Isn't there a FAQ for this?
>
>
That wasn't very helpful, Joe.
Jane, just make a link from
uncompress to compress.
Or after "par 40qie":
Joe Public writes:
> Jane Doe writes:
> > I can't find the source for
> > uncompress.
> Oh no, not again!!!
>
> Isn't there a FAQ for this?
That wasn't very helpful, Joe.
Jane, just make a link from
uncompress to compress.
Before:
I sure hope there's still room
in Dr. Jones' section of archaeology.
I've heard he's the bestest. [sic]
After "par 50g":
I sure hope there's still room in
Dr. Jones' section of archaeology. I've
heard he's the bestest. [sic]
Or after "par 50gc":
I sure hope there's still room in
Dr. Jones' section of archaeology. I've
heard he's the bestest. [sic]
Before:
John writes:
: Mary writes:
: + Anastasia writes:
: + > Hi all!
: + Hi Ana!
: Hi Ana & Mary!
Please unsubscribe me from alt.hello.
After "par Q+:+ q":
John writes:
: Mary writes:
:
: + Anastasia writes:
: +
: + > Hi all!
: +
: + Hi Ana!
:
: Hi Ana & Mary!
Please unsubscribe me from alt.hello.
Before:
amc> The b option was added primarily to deal with
amc> this new style of quotation
amc> which became popular after Par 1.41 was released.
amc>
amc> Par still pays attention to body characters.
amc> Par should not mistake "Par" for part of the prefix.
amc> Par should not mistake "." for a suffix.
After "par B=._A_a 50bg":
amc> The b option was added primarily to
amc> deal with this new style of quotation
amc> which became popular after Par 1.41
amc> was released.
amc>
amc> Par still pays attention to body
amc> characters. Par should not mistake
amc> "Par" for part of the prefix. Par
amc> should not mistake "." for a suffix.
SEE ALSO
par.doc
LIMITATIONS
The guess feature guesses wrong in cases like the following:
I calc'd the approx.
Fermi level to 3 sig. digits.
With guess = 1, par will incorrectly assume that "approx." ends a sen‐
tence. If the input were:
I calc'd the approx. Fermi
level to 3 sig. digits.
then par would refuse to put a line break between "approx." and "Fermi"
in the output, mainly to avoid creating the first situation (in case
the paragraph were to be fed back through par again). This non-break‐
ing space policy does come in handy for cases like "Mr. Johnson" and
"Jan. 1", though.
The guess feature only goes one way. par can preserve wide sentence
breaks in a paragraph, or remove them, but it can't insert them if they
aren't already in the input.
If you use tabs, you may not like the way par handles (or doesn't han‐
dle) them. It expands them into spaces. I didn't let par output tabs
because tabs don't make sense. Not everyone's terminal has the same
tab settings, so text files containing tabs are sometimes mangled. In
fact, almost every text file containing tabs gets mangled when some‐
thing is inserted at the beginning of each line (when quoting e-mail or
commenting out a section of a shell script, for example), making them a
pain to edit. In my opinion, the world would be a nicer place if
everyone stopped using tabs, so I'm doing my part by not letting par
output them. (Thanks to Eric Stuebe for showing me the light about
tabs.)
There is currently no way for the length of the output prefix to differ
from the length of the input prefix. Ditto for the suffix. I may con‐
sider adding this capability in a future release, but right now I'm not
sure how I'd want it to work.
APOLOGIES
Par began in July 1993 as a small program designed to do one narrow
task: reformat a single paragraph that might have a border on either
side. It was pretty clean back then. Over the next three months, it
very rapidly expanded to handle multiple paragraphs, offer more
options, and take better guesses, at the cost of becoming extremely
complex, and very unclean. It is nowhere near the optimal design for
the larger task it now tries to address. Its only redeeming features
are that it is extremely useful (I find it indispensable), extremely
portable, and very stable (between the release of version 1.41 on
1993-Oct-31 and the release of version 1.52 on 2001-Apr-29, no incor‐
rect behavior was reported).
Back in 1993 I had very little experience at writing documentation for
users, so the documentation for Par became rather nightmarish. There
is no separation between how-it-works (which is painfully complex) and
how-to-use-it (which is fairly simple, if you can ever figure it out).
Someday I ought to reexamine the problem, and redesign a new, clean
solution from scratch. I don't know when I might get enough free time
to start on such a project. Text files may be obsolete by then.
BUGS
If I knew of any bugs, I wouldn't release the package. Of course,
there may be bugs that I haven't yet discovered.
If you find any bugs (in the program or in the documentation), or if
you have any suggestions, please send e-mail to:
amc@cs.berkeley.edu
When reporting a bug, please include the exact input and command line
options used, and the version number of par, so that I can reproduce
it.
The latest release of Par is available on the Web at:
http://www.cs.berkeley.edu/~amc/Par/
These addresses will change. I'll try to leave forward pointers.
Par 1.52 2001-Apr-29 par(1)
