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App-ansifold-1.06
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/ ansifold

NAME

ansifold - fold command handling ANSI terminal sequences

VERSION

Version 1.06

SYNOPSIS

ansifold [ options ]

-w#, --width=#                Folding width (default 72)
     --boundary=word          Fold on word boundary
     --padding                Padding to margin space
     --padchar=_              Padding character
     --ambiguous=narrow|wide  Unicode ambiguous character handling
-p,  --paragraph              Print extra newline
     --separate=string        Set separator string (default newline)
-n                            Short cut for --separate ''
     --linebreak=mode         Line-break adjustment rule (default all)
     --runin                  Run-in width (default 4)
     --runout                 Run-out width (default 4)
-s,  --smart                  Short cut for --boundary=word --linebreak=all
     --expand[=mode]          Expand tabs
     --tabstop=n              Tab-stop position (default 8)
     --tabhead=char           Tab-head character (default space)
     --tabspace=char          Tab-space character (default space)
     --tabstyle=style         Tab expansion style

DESCRIPTION

ansifold is almost fold compatible command utilizing Text::ANSI::Fold module, which enables to handle ANSI terminal sequences and Unicode multi-byte characters properly.

It folds lines in 72 column by default. Use option -w to change the folding width.

$ ansifold -w132

Unlike original fold(1) command, multiple numbers can be specified like:

$ LANG=C date | ansifold -w 3,1,3,1,2 | cat -n
     1  Wed
     2   
     3  Dec
     4   
     5  19

Negative number fields are discarded.

$ LANG=C date | ansifold -w 3,-1,3,-1,2
Wed
Dec
19

Option -n (or --separate '') eliminates newlines between columns.

$ LANG=C date | ansifold -w 3,-1,3,-1,2 -n
WedDec19

Single field is used repeatedly for the same line, but multiple fields are not. Put comma at the end of single field to discard the rest:

ansifold -w 80,

Option -w 80, is equivalent to -w 80,0. Zero width is ignored when seen as a final number, but not ignored otherwise.

If the final width is negative, it is not discarded but takes all the rest instead. So next commands do the same thing.

$ colrm 7 10

$ ansifold -nw 6,-4,-1

Next command implements ANSI/Unicode aware expand(1) command.

$ ansifold -w -1 --expand

Number description is handled by Getopt::EX::Numbers module, and consists of start, end, step and length elements. For example,

$ echo AABBBBCCCCCCDDDDDDDDEEEEEEEEEE | ansifold -w 2:10:2

is equivalent to:

$ echo AABBBBCCCCCCDDDDDDDDEEEEEEEEEE | ansifold -w 2,4,6,8,10

and produces output like this:

AA
BBBB
CCCCCC
DDDDDDDD
EEEEEEEEEE

LINE BREAKING

Option --boundary=word prohibit to break line in the middle of alphanumeric word. This version also supports line break adjustment, mainly to perform Japanese ``KINSOKU'' processing. Use --linebreak=all to enable it.

When --linebreak option is enabled, if the cut-off text start with space or prohibited characters (e.g. closing parenthesis), they are ran-in at the end of current line as much as possible.

If the trimmed text end with prohibited characters (e.g. opening parenthesis), they are ran-out to the head of next line, provided it fits to maximum width.

Option --linebreak takes a value of all, runin, runout or none. Default value is none.

Maximum width of run-in/run-out characters are defined by --runin and --runout option. Default values are 4.

Option --smart (or simply -s) is shortcut for "--boundary=word --linebreak=all" and enables all smart text formatting capability.

TAB EXPANSION

Option --expand enables tab character expansion. Each tab character is converted to tabhead and following tabspace characters (both are space by default). They can be specified by --tabhead and --tabspace option. If the option value is longer than single characger, it is evaluated as unicode name. Next example makes tab character visible keeping text layout.

$ ansifold --expand --tabhead="MEDIUM SHADE" --tabspace="LIGHT SHADE"

Option --tabstyle allow to set --tabhead and --tabspace characters at once according to the given style name. Select from dot, symbol or shade. Styles are defined in Text::ANSI::Fold library.

SEE ALSO

ansifold

Text::ANSI::Fold

Text::ANSI::Fold::Util

Getopt::EX::Numbers

https://www.w3.org/TR/2012/NOTE-jlreq-20120403/, Requirements for Japanese Text Layout, W3C Working Group Note 3 April 2012

LICENSE

Copyright 2018- Kazumasa Utashiro

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

Kazumasa Utashiro