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- TTTTeeeerrrrmmmm::::::::RRRReeeeaaaaddddLLLLiiiinnnneeee((((3333))))22223333////JJJJuuuullll////99998888 ((((ppppeeeerrrrllll 5555....000000005555,,,, ppppaaaattttcccchhhh 00002222))))TTTTeeeerrrrmmmm::::::::RRRReeeeaaaaddddLLLLiiiinnnneeee((((3333))))
-
-
-
- NNNNAAAAMMMMEEEE
- Term::ReadLine - Perl interface to various readline
- packages. If no real package is found, substitutes stubs
- instead of basic functions.
-
- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- use Term::ReadLine;
- $term = new Term::ReadLine 'Simple Perl calc';
- $prompt = "Enter your arithmetic expression: ";
- $OUT = $term->OUT || STDOUT;
- while ( defined ($_ = $term->readline($prompt)) ) {
- $res = eval($_), "\n";
- warn $@ if $@;
- print $OUT $res, "\n" unless $@;
- $term->addhistory($_) if /\S/;
- }
-
-
- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- This package is just a front end to some other packages. At
- the moment this description is written, the only such
- package is Term-ReadLine, available on CPAN near you. The
- real target of this stub package is to set up a common
- interface to whatever Readline emerges with time.
-
- MMMMiiiinnnniiiimmmmaaaallll sssseeeetttt ooooffff ssssuuuuppppppppoooorrrrtttteeeedddd ffffuuuunnnnccccttttiiiioooonnnnssss
- All the supported functions should be called as methods,
- i.e., either as
-
- $term = new Term::ReadLine 'name';
-
- or as
-
- $term->addhistory('row');
-
- where $term is a return value of Term::ReadLine->Init.
-
- ReadLine returns the actual package that executes the
- commands. Among possible values are
- Term::ReadLine::Gnu, Term::ReadLine::Perl,
- Term::ReadLine::Stub Exporter.
-
- new returns the handle for subsequent calls to
- following functions. Argument is the name of the
- application. Optionally can be followed by two
- arguments for IN and OUT filehandles. These
- arguments should be globs.
-
- readline gets an input line, _p_o_s_s_i_b_l_y with actual
- readline support. Trailing newline is removed.
- Returns undef on EOF.
-
-
-
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- Page 1 (printed 10/23/98)
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-
-
-
- addhistory adds the line to the history of input, from
- where it can be used if the actual readline is
- present.
-
- IN, $OUT return the filehandles for input and output or
- undef if readline input and output cannot be
- used for Perl.
-
- MinLine If argument is specified, it is an advice on
- minimal size of line to be included into
- history. undef means do not include anything
- into history. Returns the old value.
-
- findConsole returns an array with two strings that give most
- appropriate names for files for input and output
- using conventions "<$in", ">out".
-
- Attribs returns a reference to a hash which describes
- internal configuration of the package. Names of
- keys in this hash conform to standard
- conventions with the leading rl_ stripped.
-
- Features Returns a reference to a hash with keys being
- features present in current implementation.
- Several optional features are used in the
- minimal interface: appname should be present if
- the first argument to new is recognized, and
- minline should be present if MinLine method is
- not dummy. autohistory should be present if
- lines are put into history automatically (maybe
- subject to MinLine), and addhistory if
- addhistory method is not dummy.
-
- If Features method reports a feature attribs as
- present, the method Attribs is not dummy.
-
- AAAAddddddddiiiittttiiiioooonnnnaaaallll ssssuuuuppppppppoooorrrrtttteeeedddd ffffuuuunnnnccccttttiiiioooonnnnssss
- Actually Term::ReadLine can use some other package, that
- will support reacher set of commands.
-
- All these commands are callable via method interface and
- have names which conform to standard conventions with the
- leading rl_ stripped.
-
- The stub package included with the perl distribution allows
- some additional methods:
-
- tkRunning makes Tk event loop run when waiting for user
- input (i.e., during readline method).
-
- ornaments makes the command line stand out by using
- termcap data. The argument to ornaments should
-
-
-
- Page 2 (printed 10/23/98)
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-
-
-
- be 0, 1, or a string of a form "aa,bb,cc,dd".
- Four components of this string should be names
- of _t_e_r_m_i_n_a_l _c_a_p_a_c_i_t_i_e_s, first two will be issued
- to make the prompt standout, last two to make
- the input line standout.
-
- newTTY takes two arguments which are input filehandle
- and output filehandle. Switches to use these
- filehandles.
-
- One can check whether the currently loaded ReadLine package
- supports these methods by checking for corresponding
- Features.
-
- EEEEXXXXPPPPOOOORRRRTTTTSSSS
- None
-
- EEEENNNNVVVVIIIIRRRROOOONNNNMMMMEEEENNNNTTTT
- The envrironment variable PERL_RL governs which ReadLine
- clone is loaded. If the value is false, a dummy interface is
- used. If the value is true, it should be tail of the name of
- the package to use, such as Perl or Gnu.
-
- As a special case, if the value of this variable is space-
- separated, the tail might be used to disable the ornaments
- by setting the tail to be o=0 or ornaments=0. The head
- should be as described above, say
-
- If the variable is not set, or if the head of space-
- separated list is empty, the best available package is
- loaded.
-
- export "PERL_RL=Perl o=0" # Use Perl ReadLine without ornaments
- export "PERL_RL= o=0" # Use best available ReadLine without ornaments
-
- (Note that processing of PERL_RL for ornaments is in the
- discretion of the particular used Term::ReadLine::*
- package).
-
- no real package is found, substitutes stubs instead of basic
- functions."
-
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