minix/external/bsd/nvi/dist/perl_api/VI.pod

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=head1 NAME
VI - VI module within perl embedded nvi
=head1 SYNOPSIS
sub wc {
my $words;
$i = $VI::StartLine;
while ($i <= $VI::StopLine) {
$_ = $curscr->GetLine($i++);
$words+=split;
}
$curscr->Msg("$words words");
}
=head1 DESCRIPTION
This pseudo module is available to perl programs run from within nvi and
provides access to the files being edited and some internal data.
Beware that you should not use this module from within a C<perldo> or
from within an C<END> block or a C<DESTROY> method.
=head2 Variables
These are set by nvi before starting each perl command.
=over 8
=item * $curscr
Object that represents the current screen.
It can be used as the ScreenId parameter of the functions below,
or you can use object oriented syntax.
# the following two are equivalent
$curscr->DelLine(57);
VI::DelLine($curscr, 57);
=item * $StartLine
Line number of the first line of the selected range or of the file if no
range was specified.
=item * $StopLine
Line number of the last line of the selected range or of the file if no
range was specified.
=back
=head2 Functions
=over 8
=item * AppendLine
VI::AppendLine(screenId,lineNumber,text);
Append the string text after the line in lineNumber.
=item * DelLine
VI::DelLine(screenId,lineNum);
Delete lineNum.
=item * EndScreen
VI::EndScreen(screenId);
End a screen.
=item * FindScreen
VI::FindScreen(file);
Return the screen id associated with file name.
=item * GetCursor
($line, $column) = VI::GetCursor(screenId);
Return the current cursor position as a list with two elements.
=item * GetLine
VI::GetLine(screenId,lineNumber);
Return lineNumber.
=item * GetMark
($line, $column) = VI::GetMark(screenId,mark);
Return the mark's cursor position as a list with two elements.
=item * GetOpt
VI::GetOpt(screenId,option);
Return the value of an option.
=item * InsertLine
VI::InsertLine(screenId,lineNumber,text);
Insert the string text before the line in lineNumber.
=item * LastLine
VI::LastLine(screenId);
Return the last line in the screen.
=item * MapKey
VI::MapKey(screenId,key,perlproc);
Associate a key with a perl procedure.
=item * Msg
VI::Msg(screenId,text);
Set the message line to text.
=item * NewScreen
VI::NewScreen(screenId);
VI::NewScreen(screenId,file);
Create a new screen. If a filename is specified then the screen is
opened with that file.
=item * Run
VI::Run(screenId,cmd);
Run the ex command cmd.
=item * SetCursor
VI::SetCursor(screenId,line,column);
Set the cursor to the line and column numbers supplied.
=item * SetLine
VI::SetLine(screenId,lineNumber,text);
Set lineNumber to the text supplied.
=item * SetMark
VI::SetMark(screenId,mark,line,column);
Set the mark to the line and column numbers supplied.
=item * SetOpt
VI::SetOpt(screenId,command);
Set an option.
=item * SwitchScreen
VI::SwitchScreen(screenId,screenId);
Change the current focus to screen.
=item * TagQ
$screen->TagQ("tag identification string")
Creates a new tag queue object associated to $screen
to which "tags" can be added.
See further about methods you can use on tag queues.
=item * UnmapKey
VI::UnmmapKey(screenId,key);
Unmap a key.
=item * Warn
This is the default warning handler.
It adds any warnings to the error string.
=item * Opt
$screen->Opt;
Returns a tied hash representing the options of the screen.
Note that you can only retrieve and set hash elements.
=item * Map
$screen->Map;
Returns a tied hash representing the mappings of the screen.
Note that you can only retrieve, set and delete hash elements.
=item * Mark
$screen->Mark;
Returns a tied hash representing the marks of the screen.
=item * Line
$screen->Line;
Returns a tied array representing the lines of the screen.
=back
=head2 Tag queue methods
=item * Add
$tagq->Add($filename, $searchstring, $msg)
Adds a tag to the tag queue.
The $searchstring argument is (line)number or
a string representing a regular expression.
=item * Push
$tagq->Push()
Pushes the tag queue onto its associated screen.
The result of the operation is as if the user had enter the
tag command and nvi had found the locations that were added
using the Add method.
For an example, see the make.pl script.
=back
=head1 EXAMPLES
sub showmarks {
my ($mark, $all);
for $mark ('a' .. 'z') {
eval {VI::GetMark($VI::ScreenId, $mark)};
$all .= $mark unless ($@);
}
VI::Msg($VI::ScreenId,"Set marks: $all");
}
sub forall {
my ($code) = shift;
my ($i) = $VI::StartLine-1;
while (++$i <= $VI::StopLine) {
$_ = VI::GetLine($VI::ScreenId, $i);
VI::SetLine($VI::ScreenId, $i, $_) if(&$code);
}
}
Now you can do
:perl forall sub{s/perlre/substitution/}
Although you'll probably use
:perldo s/perlre/substitution/
instead.
See L<perlre> for perl regular expressions.
=head1 SEE ALSO
L<nviperl>
=head1 AUTHOR
Sven Verdoolaege <skimo@kotnet.org>