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Cap.pm
package Term::Cap; # Since the debugger uses Term::ReadLine which uses Term::Cap, we want # to load as few modules as possible. This includes Carp.pm. sub carp { require Carp; goto &Carp::carp; } sub croak { require Carp; goto &Carp::croak; } use strict; use vars qw($VERSION $VMS_TERMCAP); use vars qw($termpat $state $first $entry); $VERSION = '1.17'; # TODO: # support Berkeley DB termcaps # force $FH into callers package? # keep $FH in object at Tgetent time? =head1 NAME Term::Cap - Perl termcap interface =head1 SYNOPSIS require Term::Cap; $terminal = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed }; $terminal->Trequire(qw/ce ku kd/); $terminal->Tgoto('cm', $col, $row, $FH); $terminal->Tputs('dl', $count, $FH); $terminal->Tpad($string, $count, $FH); =head1 DESCRIPTION These are low-level functions to extract and use capabilities from a terminal capability (termcap) database. More information on the terminal capabilities will be found in the termcap manpage on most Unix-like systems. =head2 METHODS The output strings for B<Tputs> are cached for counts of 1 for performance. B<Tgoto> and B<Tpad> do not cache. C<$self-E<gt>{_xx}> is the raw termcap data and C<$self-E<gt>{xx}> is the cached version. print $terminal->Tpad($self->{_xx}, 1); B<Tgoto>, B<Tputs>, and B<Tpad> return the string and will also output the string to $FH if specified. =cut # Preload the default VMS termcap. # If a different termcap is required then the text of one can be supplied # in $Term::Cap::VMS_TERMCAP before Tgetent is called. if ( $^O eq 'VMS' ) { chomp( my @entry = <DATA> ); $VMS_TERMCAP = join '', @entry; } # Returns a list of termcap files to check. sub termcap_path { ## private my @termcap_path; # $TERMCAP, if it's a filespec push( @termcap_path, $ENV{TERMCAP} ) if ( ( exists $ENV{TERMCAP} ) && ( ( $^O eq 'os2' || $^O eq 'MSWin32' || $^O eq 'dos' ) ? $ENV{TERMCAP} =~ /^[a-z]:[\\\/]/is : $ENV{TERMCAP} =~ /^\//s ) ); if ( ( exists $ENV{TERMPATH} ) && ( $ENV{TERMPATH} ) ) { # Add the users $TERMPATH push( @termcap_path, split( /(:|\s+)/, $ENV{TERMPATH} ) ); } else { # Defaults push( @termcap_path, exists $ENV{'HOME'} ? $ENV{'HOME'} . '/.termcap' : undef, '/etc/termcap', '/usr/share/misc/termcap', ); } # return the list of those termcaps that exist return grep { defined $_ && -f $_ } @termcap_path; } =over 4 =item B<Tgetent> Returns a blessed object reference which the user can then use to send the control strings to the terminal using B<Tputs> and B<Tgoto>. The function extracts the entry of the specified terminal type I<TERM> (defaults to the environment variable I<TERM>) from the database. It will look in the environment for a I<TERMCAP> variable. If found, and the value does not begin with a slash, and the terminal type name is the same as the environment string I<TERM>, the I<TERMCAP> string is used instead of reading a termcap file. If it does begin with a slash, the string is used as a path name of the termcap file to search. If I<TERMCAP> does not begin with a slash and name is different from I<TERM>, B<Tgetent> searches the files F<$HOME/.termcap>, F</etc/termcap>, and F</usr/share/misc/termcap>, in that order, unless the environment variable I<TERMPATH> exists, in which case it specifies a list of file pathnames (separated by spaces or colons) to be searched B<instead>. Whenever multiple files are searched and a tc field occurs in the requested entry, the entry it names must be found in the same file or one of the succeeding files. If there is a C<:tc=...:> in the I<TERMCAP> environment variable string it will continue the search in the files as above. The extracted termcap entry is available in the object as C<$self-E<gt>{TERMCAP}>. It takes a hash reference as an argument with two optional keys: =over 2 =item OSPEED The terminal output bit rate (often mistakenly called the baud rate) for this terminal - if not set a warning will be generated and it will be defaulted to 9600. I<OSPEED> can be specified as either a POSIX termios/SYSV termio speeds (where 9600 equals 9600) or an old DSD-style speed ( where 13 equals 9600). =item TERM The terminal type whose termcap entry will be used - if not supplied it will default to $ENV{TERM}: if that is not set then B<Tgetent> will croak. =back It calls C<croak> on failure. =cut sub Tgetent { ## public -- static method my $class = shift; my ($self) = @_; $self = {} unless defined $self; bless $self, $class; my ( $term, $cap, $search, $field, $max, $tmp_term, $TERMCAP ); local ( $termpat, $state, $first, $entry ); # used inside eval local $_; # Compute PADDING factor from OSPEED (to be used by Tpad) if ( !$self->{OSPEED} ) { if ($^W) { carp "OSPEED was not set, defaulting to 9600"; } $self->{OSPEED} = 9600; } if ( $self->{OSPEED} < 16 ) { # delays for old style speeds my @pad = ( 0, 200, 133.3, 90.9, 74.3, 66.7, 50, 33.3, 16.7, 8.3, 5.5, 4.1, 2, 1, .5, .2 ); $self->{PADDING} = $pad[ $self->{OSPEED} ]; } else { $self->{PADDING} = 10000 / $self->{OSPEED}; } unless ( $self->{TERM} ) { if ( $ENV{TERM} ) { $self->{TERM} = $ENV{TERM} ; } else { if ( $^O eq 'MSWin32' ) { $self->{TERM} = 'dumb'; } else { croak "TERM not set"; } } } $term = $self->{TERM}; # $term is the term type we are looking for # $tmp_term is always the next term (possibly :tc=...:) we are looking for $tmp_term = $self->{TERM}; # protect any pattern metacharacters in $tmp_term $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; my $foo = ( exists $ENV{TERMCAP} ? $ENV{TERMCAP} : '' ); # $entry is the extracted termcap entry if ( ( $foo !~ m:^/:s ) && ( $foo =~ m/(^|\|)${termpat}[:|]/s ) ) { $entry = $foo; } my @termcap_path = termcap_path(); if ( !@termcap_path && !$entry ) { # last resort--fake up a termcap from terminfo local $ENV{TERM} = $term; if ( $^O eq 'VMS' ) { $entry = $VMS_TERMCAP; } else { if ( grep { -x "$_/infocmp" } split /:/, $ENV{PATH} ) { eval { my $tmp = `infocmp -C 2>/dev/null`; $tmp =~ s/^#.*\n//gm; # remove comments if ( ( $tmp !~ m%^/%s ) && ( $tmp =~ /(^|\|)${termpat}[:|]/s ) ) { $entry = $tmp; } }; warn "Can't run infocmp to get a termcap entry: $@" if $@; } else { # this is getting desperate now if ( $self->{TERM} eq 'dumb' ) { $entry = 'dumb|80-column dumb tty::am::co#80::bl=^G:cr=^M:do=^J:sf=^J:'; } } } } croak "Can't find a valid termcap file" unless @termcap_path || $entry; $state = 1; # 0 == finished # 1 == next file # 2 == search again $first = 0; # first entry (keeps term name) $max = 32; # max :tc=...:'s if ($entry) { # ok, we're starting with $TERMCAP $first++; # we're the first entry # do we need to continue? if ( $entry =~ s/:tc=([^:]+):/:/ ) { $tmp_term = $1; # protect any pattern metacharacters in $tmp_term $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; } else { $state = 0; # we're already finished } } # This is eval'ed inside the while loop for each file $search = q{ while (<TERMCAP>) { next if /^\\t/ || /^#/; if ($_ =~ m/(^|\\|)${termpat}[:|]/o) { chomp; s/^[^:]*:// if $first++; $state = 0; while ($_ =~ s/\\\\$//) { defined(my $x = <TERMCAP>) or last; $_ .= $x; chomp; } last; } } defined $entry or $entry = ''; $entry .= $_ if $_; }; while ( $state != 0 ) { if ( $state == 1 ) { # get the next TERMCAP $TERMCAP = shift @termcap_path || croak "failed termcap lookup on $tmp_term"; } else { # do the same file again # prevent endless recursion $max-- || croak "failed termcap loop at $tmp_term"; $state = 1; # ok, maybe do a new file next time } open( TERMCAP, "< $TERMCAP\0" ) || croak "open $TERMCAP: $!"; eval $search; die $@ if $@; close TERMCAP; # If :tc=...: found then search this file again $entry =~ s/:tc=([^:]+):/:/ && ( $tmp_term = $1, $state = 2 ); # protect any pattern metacharacters in $tmp_term $termpat = $tmp_term; $termpat =~ s/(\W)/\\$1/g; } croak "Can't find $term" if $entry eq ''; $entry =~ s/:+\s*:+/:/g; # cleanup $entry $entry =~ s/:+/:/g; # cleanup $entry $self->{TERMCAP} = $entry; # save it # print STDERR "DEBUG: $entry = ", $entry, "\n"; # Precompile $entry into the object $entry =~ s/^[^:]*://; foreach $field ( split( /:[\s:\\]*/, $entry ) ) { if ( defined $field && $field =~ /^(\w{2,})$/ ) { $self->{ '_' . $field } = 1 unless defined $self->{ '_' . $1 }; # print STDERR "DEBUG: flag $1\n"; } elsif ( defined $field && $field =~ /^(\w{2,})\@/ ) { $self->{ '_' . $1 } = ""; # print STDERR "DEBUG: unset $1\n"; } elsif ( defined $field && $field =~ /^(\w{2,})#(.*)/ ) { $self->{ '_' . $1 } = $2 unless defined $self->{ '_' . $1 }; # print STDERR "DEBUG: numeric $1 = $2\n"; } elsif ( defined $field && $field =~ /^(\w{2,})=(.*)/ ) { # print STDERR "DEBUG: string $1 = $2\n"; next if defined $self->{ '_' . ( $cap = $1 ) }; $_ = $2; if ( ord('A') == 193 ) { s/\\E/\047/g; s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg; s/\\n/\n/g; s/\\r/\r/g; s/\\t/\t/g; s/\\b/\b/g; s/\\f/\f/g; s/\\\^/\337/g; s/\^\?/\007/g; s/\^(.)/pack('c',ord($1) & 31)/eg; s/\\(.)/$1/g; s/\337/^/g; } else { s/\\E/\033/g; s/\\(\d\d\d)/pack('c',oct($1) & 0177)/eg; s/\\n/\n/g; s/\\r/\r/g; s/\\t/\t/g; s/\\b/\b/g; s/\\f/\f/g; s/\\\^/\377/g; s/\^\?/\177/g; s/\^(.)/pack('c',ord($1) & 31)/eg; s/\\(.)/$1/g; s/\377/^/g; } $self->{ '_' . $cap } = $_; } # else { carp "junk in $term ignored: $field"; } } $self->{'_pc'} = "\0" unless defined $self->{'_pc'}; $self->{'_bc'} = "\b" unless defined $self->{'_bc'}; $self; } # $terminal->Tpad($string, $cnt, $FH); =item B<Tpad> Outputs a literal string with appropriate padding for the current terminal. It takes three arguments: =over 2 =item B<$string> The literal string to be output. If it starts with a number and an optional '*' then the padding will be increased by an amount relative to this number, if the '*' is present then this amount will be multiplied by $cnt. This part of $string is removed before output/ =item B<$cnt> Will be used to modify the padding applied to string as described above. =item B<$FH> An optional filehandle (or IO::Handle ) that output will be printed to. =back The padded $string is returned. =cut sub Tpad { ## public my $self = shift; my ( $string, $cnt, $FH ) = @_; my ( $decr, $ms ); if ( defined $string && $string =~ /(^[\d.]+)(\*?)(.*)$/ ) { $ms = $1; $ms *= $cnt if $2; $string = $3; $decr = $self->{PADDING}; if ( $decr > .1 ) { $ms += $decr / 2; $string .= $self->{'_pc'} x ( $ms / $decr ); } } print $FH $string if $FH; $string; } # $terminal->Tputs($cap, $cnt, $FH); =item B<Tputs> Output the string for the given capability padded as appropriate without any parameter substitution. It takes three arguments: =over 2 =item B<$cap> The capability whose string is to be output. =item B<$cnt> A count passed to Tpad to modify the padding applied to the output string. If $cnt is zero or one then the resulting string will be cached. =item B<$FH> An optional filehandle (or IO::Handle ) that output will be printed to. =back The appropriate string for the capability will be returned. =cut sub Tputs { ## public my $self = shift; my ( $cap, $cnt, $FH ) = @_; my $string; $cnt = 0 unless $cnt; if ( $cnt > 1 ) { $string = Tpad( $self, $self->{ '_' . $cap }, $cnt ); } else { # cache result because Tpad can be slow unless ( exists $self->{$cap} ) { $self->{$cap} = exists $self->{"_$cap"} ? Tpad( $self, $self->{"_$cap"}, 1 ) : undef; } $string = $self->{$cap}; } print $FH $string if $FH; $string; } # $terminal->Tgoto($cap, $col, $row, $FH); =item B<Tgoto> B<Tgoto> decodes a cursor addressing string with the given parameters. There are four arguments: =over 2 =item B<$cap> The name of the capability to be output. =item B<$col> The first value to be substituted in the output string ( usually the column in a cursor addressing capability ) =item B<$row> The second value to be substituted in the output string (usually the row in cursor addressing capabilities) =item B<$FH> An optional filehandle (or IO::Handle ) to which the output string will be printed. =back Substitutions are made with $col and $row in the output string with the following sprintf() line formats: %% output `%' %d output value as in printf %d %2 output value as in printf %2d %3 output value as in printf %3d %. output value as in printf %c %+x add x to value, then do %. %>xy if value > x then add y, no output %r reverse order of two parameters, no output %i increment by one, no output %B BCD (16*(value/10)) + (value%10), no output %n exclusive-or all parameters with 0140 (Datamedia 2500) %D Reverse coding (value - 2*(value%16)), no output (Delta Data) The output string will be returned. =cut sub Tgoto { ## public my $self = shift; my ( $cap, $code, $tmp, $FH ) = @_; my $string = $self->{ '_' . $cap }; my $result = ''; my $after = ''; my $online = 0; my @tmp = ( $tmp, $code ); my $cnt = $code; while ( $string =~ /^([^%]*)%(.)(.*)/ ) { $result .= $1; $code = $2; $string = $3; if ( $code eq 'd' ) { $result .= sprintf( "%d", shift(@tmp) ); } elsif ( $code eq '.' ) { $tmp = shift(@tmp); if ( $tmp == 0 || $tmp == 4 || $tmp == 10 ) { if ($online) { ++$tmp, $after .= $self->{'_up'} if $self->{'_up'}; } else { ++$tmp, $after .= $self->{'_bc'}; } } $result .= sprintf( "%c", $tmp ); $online = !$online; } elsif ( $code eq '+' ) { $result .= sprintf( "%c", shift(@tmp) + ord($string) ); $string = substr( $string, 1, 99 ); $online = !$online; } elsif ( $code eq 'r' ) { ( $code, $tmp ) = @tmp; @tmp = ( $tmp, $code ); $online = !$online; } elsif ( $code eq '>' ) { ( $code, $tmp, $string ) = unpack( "CCa99", $string ); if ( $tmp[0] > $code ) { $tmp[0] += $tmp; } } elsif ( $code eq '2' ) { $result .= sprintf( "%02d", shift(@tmp) ); $online = !$online; } elsif ( $code eq '3' ) { $result .= sprintf( "%03d", shift(@tmp) ); $online = !$online; } elsif ( $code eq 'i' ) { ( $code, $tmp ) = @tmp; @tmp = ( $code + 1, $tmp + 1 ); } else { return "OOPS"; } } $string = Tpad( $self, $result . $string . $after, $cnt ); print $FH $string if $FH; $string; } # $terminal->Trequire(qw/ce ku kd/); =item B<Trequire> Takes a list of capabilities as an argument and will croak if one is not found. =cut sub Trequire { ## public my $self = shift; my ( $cap, @undefined ); foreach $cap (@_) { push( @undefined, $cap ) unless defined $self->{ '_' . $cap } && $self->{ '_' . $cap }; } croak "Terminal does not support: (@undefined)" if @undefined; } =back =head1 EXAMPLES use Term::Cap; # Get terminal output speed require POSIX; my $termios = new POSIX::Termios; $termios->getattr; my $ospeed = $termios->getospeed; # Old-style ioctl code to get ospeed: # require 'ioctl.pl'; # ioctl(TTY,$TIOCGETP,$sgtty); # ($ispeed,$ospeed) = unpack('cc',$sgtty); # allocate and initialize a terminal structure $terminal = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed }; # require certain capabilities to be available $terminal->Trequire(qw/ce ku kd/); # Output Routines, if $FH is undefined these just return the string # Tgoto does the % expansion stuff with the given args $terminal->Tgoto('cm', $col, $row, $FH); # Tputs doesn't do any % expansion. $terminal->Tputs('dl', $count = 1, $FH); =head1 COPYRIGHT AND LICENSE Copyright 1995-2015 (c) perl5 porters. This software is free software and can be modified and distributed under the same terms as Perl itself. Please see the file README in the Perl source distribution for details of the Perl license. =head1 AUTHOR This module is part of the core Perl distribution and is also maintained for CPAN by Jonathan Stowe <jns@gellyfish.co.uk>. The code is hosted on Github: https://github.com/jonathanstowe/Term-Cap please feel free to fork, submit patches etc, etc there. =head1 SEE ALSO termcap(5) =cut # Below is a default entry for systems where there are terminals but no # termcap 1; __DATA__ vt220|vt200|DEC VT220 in vt100 emulation mode: am:mi:xn:xo: co#80:li#24: RA=\E[?7l:SA=\E[?7h: ac=kkllmmjjnnwwqquuttvvxx:ae=\E(B:al=\E[L:as=\E(0: bl=^G:cd=\E[J:ce=\E[K:cl=\E[H\E[2J:cm=\E[%i%d;%dH: cr=^M:cs=\E[%i%d;%dr:dc=\E[P:dl=\E[M:do=\E[B: ei=\E[4l:ho=\E[H:im=\E[4h: is=\E[1;24r\E[24;1H: nd=\E[C: kd=\E[B::kl=\E[D:kr=\E[C:ku=\E[A:le=^H: mb=\E[5m:md=\E[1m:me=\E[m:mr=\E[7m: kb=\0177: r2=\E>\E[24;1H\E[?3l\E[?4l\E[?5l\E[?7h\E[?8h\E=:rc=\E8: sc=\E7:se=\E[27m:sf=\ED:so=\E[7m:sr=\EM:ta=^I: ue=\E[24m:up=\E[A:us=\E[4m:ve=\E[?25h:vi=\E[?25l:
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