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#### NAME

       vlna - adds tilde after each non-syllabic preposition



#### USAGE

       vlna [options] [filenames]



#### PREFACE

       There  exists  a  special  Czech  and Slovak typographical rule: you cannot leave the non-
syllabic preposition on the end of one line and continue writting text on next  line.  For
example, you cannot write down the text "v lese" (in a forest) like "v<new-line>lese". The
program vlna adds the asciitilde between such preposition and the next  word  and  removes
the  space(s) in this place.  It means, the program converts "v lese" to "v~lese". You can
use this program as a preporcessor before TeXing. Moreower, you can set  another  sequence
to store instead asciitilte (see the -x option).



#### DESCRIPTION

       The  program  vlna  processes  one  or  more files, searches the non-syllabic prepositions
followed by space(s) in these files and converts this/these  space(s)  to  asciitilde  for
each such occurrence.

In  the processed file, the activity of the program can be blocked by %~- sequence and the
activity can be restored again by the %~+ sequence. These sequences can include spaces, it
means that % ~- is a correct sequence too.

The  rule  to recognize a preposition follows: The arbitrary number of opening parentheses
can be written before the preposition and before these (optional) parentheses must be  the
space,  tabelator or new-line. The preposition itself is one-letter word, the letters have
to be from this set: {KkSsVvZzOoUuAI}. See the -v option if you want to change this set of
letters.  From  version 1.2, the TeX sequence can be written before preposition and before
the brace. Example: "<new-line>([V lese" is converted  to  "<new-line>([V~lese".   Another
example: "\uv{V lese}" is converted to "\uv{V~lese}".

One  or  more  blank-spaces  have  to  be included after preposition before next word. The
blank-space means space or  tabelator.   One  <new-line>  can  be  here  too.   All  these
characters  are  removed and replaced by asciitilde (or by another string, see -x option).
If <new-line> is deleted, another <new-line> is created  before  preposition  (and  before
optional  parentheses)  in  order to the number of lines is kept unchanged.  Example: "...
V<new-line><tabelator>lese" is converted to "...<new-line>V~lese".

The program checks the consintence of TeX's math environments (if -m option  isn't  used).
For  example  the "$...$$..." sequence (it means the display mode switch inside the text- math mode) generates a warning. Empty line inside display mode generates a warning too and the program processes next text like in normal (non-math) mode. The existence of the "" inside display mode are accepted because the constructions like$$..\hbox{..$..$}..$$are allowed and common. The consistence of verbatim mode is checked on the end of the file. If the file ends but the verbatim mode does not end the warning is printed. This behavior can be switched off by -n or -w options. The program suppresses the tilde changing after letters like prepositions but they are not prepositions because the \TeX or \LaTeX sequence precedes. Example: "vlastnosti \TeX u jsou" is not converted to "vlastnosti \TeX u~jsou", because this text is printed (after TeX processing) like "vlastnosti TeXu jsou". The letter "u" is a suffix here, no preposition.  #### OPTIONS  The options are optional and can be written in arbitrarty order separated by space. -f Filter. The [filenames] are treated as follows: vlna -f filename1 filename2 Input is filename1, output is filename2. vlna -f filename1 Input is filename1, output is stdout. vlna -f Input is stdin, output is stdout. vlna filename1 [filename2 [filename3 ...]] If the -f option is omitted then each file is processed independently and it is re-written. -s The silent mode. No messages, warnings, statistics are printed. Only errors which terminates the program untimely are printed. If this parameter is omitted then banner, warnings and statistics are printed to stderr. -r Do not create the backups. The option -r is irrelevant if the -f option is used. If the -f and -r options aren't used then each re-written file is stored with its original contents to a backup file (the name of backup file is the same as filename, only the tilde is used instead of the last character). -v characters The set of characters treated as non-syllabic prepositions is declared by this option. Default: -v KkSsVvZzOoUuAI. The space between -v and characters is required. -x code The code is a string written in hexadecimal notation (even hexa digits is required). This string will be saved after prepositions instead asciitilde which is default. The example: -x C2A0 two bytes are stored after each non-syllabic preposition, first byte has C2 code and second byte has A0 code. This example means that NO-BREAK SPACE in UTF8 encoding will be used after prepositions. Another example: -x 00A0 the NO-BREAK SPACE in UTF16 encoding. Another example: -x 48454C4C4F the string HELLO will be used. The space between -x and code is required. -m The math-modes (... and$$...$\$)  are  ignored.   It  means  that  non-syllabic
prepositions is searched in math-mode too.  Default (without -m option): no changes
in math modes are done because (for example)  "v"  is  variable  in  math-mode,  no
preposition.

-n     The  verbatim mode (\verb<char>...<char>, \begtt...\endtt) is ignored, it means the
program can do a changes in verbatim environment.  Default (without -n option):  no
changes in verbatim mode are done.

-l     The   LaTeX   mode.  The  following  environments  are  treated  as  display  mode:
\begin{display}...\end{display}  and  ...   and   the
following       environment       is       treated      as      verbatim      mode:
\begin{verbatim}...\end{verbatim}.

-w     The web mode (Knuth's web, no  www:-).  The  following  sequences  are  treated  as
verbatim: @<, @d...@*, @space or @>|.  It means program code is unchanged in *.w or
*.web files, only web-comments are processed.



#### EXAMPLES

       vlna -m -n -s -r file
The program has a behavior similar to the old vlnka program.

vlna *.tex
All files with .tex suffix in current directory will  be  processed  (and  possibly
changed). (The "*" is UNIX-shell feautre).

vlna -f file > /dev/null
Only  the consistence checking of math and verbatim modes is processed.  No changes
are done.



#### AUTHORS

       Petr Olsak <olsak@math.feld.cvut.cz>.  Man page (Czech original) and Makefile  is  created
by Rulolf Cejka

March 30 2009                                   VLNA(1)