Ubuntu Manpage: textutil::adjust - Procedures to adjust, indent, and undent paragraphs

NAME

       textutil::adjust - Procedures to adjust, indent, and undent paragraphs

SYNOPSIS

       package require Tcl  8.2

       package require textutil::adjust  ?0.7.3?

       ::textutil::adjust::adjust string ?option value...?

       ::textutil::adjust::readPatterns filename

       ::textutil::adjust::listPredefined

       ::textutil::adjust::getPredefined filename

       ::textutil::adjust::indent string prefix ?skip?

       ::textutil::adjust::undent string

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DESCRIPTION

The package textutil::adjust provides commands that manipulate strings or texts (a.k.a. long strings or
string with embedded newlines or paragraphs), adjusting, or indenting them.

The complete set of procedures is described below.

::textutil::adjust::adjust string ?option value...?
Do a justification on the string according to the options. The string is taken as one big
paragraph, ignoring any newlines. Then the line is formatted according to the options used, and
the command returns a new string with enough lines to contain all the printable chars in the input
string. A line is a set of characters between the beginning of the string and a newline, or
between 2 newlines, or between a newline and the end of the string. If the input string is small
enough, the returned string won't contain any newlines.

Together with ::textutil::adjust::indent it is possible to create properly wrapped paragraphs with
arbitrary indentations.

By default, any occurrence of space or tabulation characters are replaced by a single space so
that each word in a line is separated from the next one by exactly one space character, and this
forms a real line. Each real line is placed in a logical line, which has exactly a given length
(see the option -length below). The real line may be shorter. Again by default, trailing spaces
are ignored before returning the string (see the option -full below).

The following options may be used after the string parameter, and change the way the command
places a real line in a logical line.

-full boolean
If set to false (default), trailing space characters are deleted before returning the
string. If set to true, any trailing space characters are left in the string.

-hyphenate boolean
If set to false (default), no hyphenation will be done. If set to true, the command will
try to hyphenate the last word of a line. Note: Hyphenation patterns must be loaded prior,
using the command ::textutil::adjust::readPatterns.

-justify center|left|plain|right
Sets the justification of the returned string to either left (default), center, plain or
right. The justification means that any line in the returned string but the last one is
build according to the value. If the justification is set to plain and the number of
printable chars in the last line is less than 90% of the length of a line (see the option
-length), then this line is justified with the left value, avoiding the expansion of this
line when it is too small. The meaning of each value is:

center The real line is centered in the logical line. If needed, a set of space characters
are added at the beginning (half of the needed set) and at the end (half of the
needed set) of the line if required (see the option -full).

left The real line is set on the left of the logical line. It means that there are no
space chars at the beginning of this line. If required, all needed space chars are
added at the end of the line (see the option -full).

plain The real line is exactly set in the logical line. It means that there are no leading
or trailing space chars. All the needed space chars are added in the real line,
between 2 (or more) words.

right The real line is set on the right of the logical line. It means that there are no
space chars at the end of this line, and there may be some space chars at the
beginning, despite of the -full option.

-length integer
Set the length of the logical line in the string to integer. integer must be a positive
integer value. Defaults to 72.

-strictlength boolean
If set to false (default), a line can exceed the specified -length if a single word is
longer than -length. If set to true, words that are longer than -length are split so that
no line exceeds the specified -length.

::textutil::adjust::readPatterns filename
Loads the internal storage for hyphenation patterns with the contents of the file filename. This
has to be done prior to calling command ::textutil::adjust::adjust with "-hyphenate true", or the
hyphenation process will not work correctly.

The package comes with a number of predefined pattern files, and the command
::textutil::adjust::listPredefined can be used to find out their names.

::textutil::adjust::listPredefined
This command returns a list containing the names of the hyphenation files coming with this
package.

::textutil::adjust::getPredefined filename
Use this command to query the package for the full path name of the hyphenation file filename
coming with the package. Only the filenames found in the list returned by
::textutil::adjust::listPredefined are legal arguments for this command.

::textutil::adjust::indent string prefix ?skip?
Each line in the string is indented by adding the string prefix at its beginning. The modified
string is returned as the result of the command.

If skip is specified the first skip lines are left untouched. The default for skip is 0, causing
the modification of all lines. Negative values for skip are treated like 0. In other words, skip >
0 creates a hanging indentation.

Together with ::textutil::adjust::adjust it is possible to create properly wrapped paragraphs with
arbitrary indentations.

::textutil::adjust::undent string
The command computes the common prefix for all lines in string consisting solely out of
whitespace, removes this from each line and returns the modified string.

Lines containing only whitespace are always reduced to completely empty lines. They and empty
lines are also ignored when computing the prefix to remove.

Together with ::textutil::adjust::adjust it is possible to create properly wrapped paragraphs with
arbitrary indentations.

BUGS, IDEAS, FEEDBACK

       This  document,  and  the package it describes, will undoubtedly contain bugs and other problems.  Please
       report such in the category  textutil  of  the  Tcllib  Trackers  [http://core.tcl.tk/tcllib/reportlist].
       Please also report any ideas for enhancements you may have for either package and/or documentation.

       When proposing code changes, please provide unified diffs, i.e the output of diff -u.

       Note  further  that  attachments  are strongly preferred over inlined patches. Attachments can be made by
       going to the Edit form of the ticket immediately after its creation, and then using the left-most  button
       in the secondary navigation bar.

KEYWORDS

       TeX, adjusting, formatting, hyphenation, indenting, justification, paragraph, string, undenting

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