Gnu(3pm) User Contributed Perl Documentation Gnu(3pm)NAMETerm::ReadLine::Gnu - Perl extension for the GNU Readline/History
Library
SYNOPSIS
use Term::ReadLine; # Do not "use Term::ReadLine::Gnu;"
$term = new Term::ReadLine 'ProgramName';
while ( defined ($_ = $term->readline('prompt>')) ) {
...
}
DESCRIPTION
Overview
This is an implementation of Term::ReadLine
<http://search.cpan.org/dist/Term-ReadLine/> using the GNU
Readline/History Library
<http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html>.
For basic functions object oriented interface is provided. These are
described in the section "Standard Methods" and ""Term::ReadLine::Gnu"
Functions".
This package also has the interface with the almost all functions and
variables which are documented in the GNU Readline/History Library
Manual. They are documented in the section ""Term::ReadLine::Gnu"
Functions" and ""Term::ReadLine::Gnu" Variables" briefly. For further
details of the GNU Readline/History Library, see GNU Readline Library
Manual <http://cnswww.cns.cwru.edu/php/chet/readline/readline.html> and
GNU History Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/history.html>.
There are some "Term::ReadLine::Gnu" original features. They are
described in the section ""Term::ReadLine::Gnu" Specific Features"
The sample programs under eg/ directory and test programs under t/
directory in the "Term::ReadLine::Gnu" distribution
<http://search.cpan.org/dist/Term-ReadLine-Gnu/> include many examples
of this module.
Standard Methods
These are standard methods defined by Term::ReadLine
<http://search.cpan.org/dist/Term-ReadLine/>.
"ReadLine"
returns the actual package that executes the commands. If this
package is being used, "Term::ReadLine::Gnu" is returned.
"new(NAME,[IN,OUT])"
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" file handles. These
arguments should be globs.
"readline(PROMPT[,PREPUT])"
gets an input line, with actual "GNU Readline" support. Trailing
newline is removed. Returns "undef" on "EOF". "PREPUT" is an
optional argument meaning the initial value of input.
The optional argument "PREPUT" is granted only if the value
"preput" is in "Features".
"PROMPT" may include some escape sequences. Use
"RL_PROMPT_START_IGNORE" to begin a sequence of non-printing
characters, and "RL_PROMPT_END_IGNORE" to end the sequence.
"AddHistory(LINE1, LINE2, ...)"
adds the lines to the history of input, from where it can be used
if the actual "readline" is present.
"IN", "OUT"
return the file handles for input and output or "undef" if
"readline" input and output cannot be used for Perl.
"MinLine([MAX])"
If argument "MAX" 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 (variables) of the package. Names of keys in this
hash conform to standard conventions with the leading "rl_"
stripped.
See section ""Term::ReadLine::Gnu" Variables" for supported
variables.
"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.
"preput" means the second argument to "readline" method is
processed. "getHistory" and "setHistory" denote that the
corresponding methods are present. "tkRunning" denotes that a Tk
application may run while ReadLine is getting input.
"tkRunning"
makes Tk event loop run when waiting for user input (i.e., during
"readline" method).
"event_loop"
See the description of "event_loop" on Term::ReadLine
<http://search.cpan.org/dist/Term-ReadLine/>.
"ornaments"
makes the command line stand out by using termcap data. The
argument to "ornaments" should be 0, 1, or a string of a form
"aa,bb,cc,dd". Four components of this string should be names of
terminal capacities, 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.
"enableUTF8"
Enables UTF-8 support.
If STDIN is in UTF-8 by the "-C" command-line switch or
"PERL_UNICODE" environment variable, or "IN" file handle has "utf8"
IO layer, then UTF-8 support is also enabled. In other cases you
need this "enableUTF8" method.
This is an original method of "Term::ReadLine:Gnu".
"Term::ReadLine::Gnu" Functions
All these GNU Readline/History Library functions supported are callable
via method interface and have names which conform to standard
conventions with the leading "rl_" stripped. For example "rl_foo()"
function is called as "$term->foo()".
The titles of the following sections are same as the titles of the
corresponding sections in the "Programming with GNU Readline" section
in the GNU Readline Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/readline.html>. Refer
them for further details.
Although it is preferred to use method interface, most methods have
lower level functions in "Term::ReadLine::Gnu::XS" package. To use
them a full qualified name is required.
Basic Behavior
The function "readline()" prints a prompt and then reads and returns a
single line of text from the user.
$_ = $term->readline('Enter a line: ');
You can change key-bindings using "bind_key(KEY, FUNCTION [,MAP])"
function. The first argument, "KEY", is the character that you want
bind. The second argument, "FUNCTION", is the function to call when
"KEY" is pressed. The "FUNCTION" can be a reference to a Perl function
(see "Custom Functions") or a "named function" named by "add_defun()"
function or commands described in the "Bindable Readline Commands"
section in the GNU Readline Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/readline.html>.
$term->bind_key(ord "\ci, 'tab-insert');
The above example binds Control-I to the 'tab-insert' command.
Custom Functions
You can write new functions using Perl. The calling sequence for a
command foo looks like
sub foo ($count, $key) { ... }
where $count is the numeric argument (or 1 if defaulted) and $key is
the key that invoked this function.
Here is an example;
sub reverse_line { # reverse a whole line
my($count, $key) = @_; # ignored in this sample function
$t->modifying(0, $a->{end}); # save undo information
$a->{line_buffer} = reverse $a->{line_buffer};
}
See the "Writing a New Function" section in the GNU Readline Library
Manual <http://cnswww.cns.cwru.edu/php/chet/readline/readline.html> for
further details.
Readline Convenience Functions
Naming a Function
"add_defun(NAME, FUNCTION [,KEY=-1])"
Add name to a Perl function "FUNCTION". If optional argument "KEY"
is specified, bind it to the "FUNCTION". Returns reference to
"FunctionPtr".
Example:
# name `reverse-line' to a function reverse_line(),
# and bind it to "\C-t"
$term->add_defun('reverse-line', \&reverse_line, ord "\ct");
Selecting a Keymap
"make_bare_keymap"
Keymap rl_make_bare_keymap()
"copy_keymap(MAP)"
Keymap rl_copy_keymap(Keymap|str map)
"make_keymap"
Keymap rl_make_keymap()
"discard_keymap(MAP)"
Keymap rl_discard_keymap(Keymap|str map)
"free_keymap(MAP)"
void rl_free_keymap(Keymap|str map)
"get_keymap"
Keymap rl_get_keymap()
"set_keymap(MAP)"
Keymap rl_set_keymap(Keymap|str map)
"get_keymap_by_name(NAME)"
Keymap rl_get_keymap_by_name(str name)
"get_keymap_name(MAP)"
str rl_get_keymap_name(Keymap map)
Binding Keys
"bind_key(KEY, FUNCTION [,MAP])"
int rl_bind_key(int key, FunctionPtr|str function,
Keymap|str map = rl_get_keymap())
Bind "KEY" to the "FUNCTION". "FUNCTION" is the name added by the
"add_defun" method. If optional argument "MAP" is specified, binds
in "MAP". Returns non-zero in case of error.
"bind_key_if_unbound(KEY, FUNCTION [,MAP])"
int rl_bind_key_if_unbound(int key, FunctionPtr|str function,
Keymap|str map = rl_get_keymap()) # GRL 5.0
"unbind_key(KEY [,MAP])"
int rl_unbind_key(int key, Keymap|str map = rl_get_keymap())
Bind "KEY" to the null function. Returns non-zero in case of
error.
"unbind_function(FUNCTION [,MAP])"
int rl_unbind_function(FunctionPtr|str function,
Keymap|str map = rl_get_keymap())
"unbind_command(COMMAND [,MAP])"
int rl_unbind_command(str command,
Keymap|str map = rl_get_keymap())
"bind_keyseq(KEYSEQ, FUNCTION [,MAP])"
int rl_bind_keyseq(str keyseq, FunctionPtr|str function,
Keymap|str map = rl_get_keymap()) # GRL 5.0
"set_key(KEYSEQ, FUNCTION [,MAP])"
int rl_set_key(str keyseq, FunctionPtr|str function,
Keymap|str map = rl_get_keymap()) # GRL 4.2
"bind_keyseq_if_unbound(KEYSEQ, FUNCTION [,MAP])"
int rl_bind_keyseq_if_unbound(str keyseq, FunctionPtr|str function,
Keymap|str map = rl_get_keymap()) # GRL 5.0
"generic_bind(TYPE, KEYSEQ, DATA, [,MAP])"
int rl_generic_bind(int type, str keyseq,
FunctionPtr|Keymap|str data,
Keymap|str map = rl_get_keymap())
"parse_and_bind(LINE)"
void rl_parse_and_bind(str line)
Parse "LINE" as if it had been read from the ~/.inputrc file and
perform any key bindings and variable assignments found. For
further detail see GNU Readline Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/readline.html>.
"read_init_file([FILENAME])"
int rl_read_init_file(str filename = '~/.inputrc')
Associating Function Names and Bindings
"named_function(NAME)"
FunctionPtr rl_named_function(str name)
"get_function_name(FUNCTION)"
str rl_get_function_name(FunctionPtr function) # TRG original
"function_of_keyseq(KEYSEQ [,MAP])"
(FunctionPtr|Keymap|str data, int type)
rl_function_of_keyseq(str keyseq,
Keymap|str map = rl_get_keymap())
"invoking_keyseqs(FUNCTION [,MAP])"
(@str) rl_invoking_keyseqs(FunctionPtr|str function,
Keymap|str map = rl_get_keymap())
"function_dumper([READABLE])"
void rl_function_dumper(int readable = 0)
"list_funmap_names"
void rl_list_funmap_names()
"funmap_names"
(@str) rl_funmap_names()
"add_funmap_entry(NAME, FUNCTION)"
int rl_add_funmap_entry(char *name, FunctionPtr|str function)
Allowing Undoing
"begin_undo_group"
int rl_begin_undo_group()
"end_undo_group"
int rl_end_undo_group()
"add_undo(WHAT, START, END, TEXT)"
int rl_add_undo(int what, int start, int end, str text)
"free_undo_list"
void rl_free_undo_list()
"do_undo"
int rl_do_undo()
"modifying([START [,END]])"
int rl_modifying(int start = 0, int end = rl_end)
Redisplay
"redisplay"
void rl_redisplay()
"forced_update_display"
int rl_forced_update_display()
"on_new_line"
int rl_on_new_line()
"on_new_line_with_prompt"
int rl_on_new_line_with_prompt() # GRL 4.1
"clear_visible_line()"
int rl_clear_visible_line() # GRL 7.0
"reset_line_state"
int rl_reset_line_state()
"crlf"
int rl_crlf()show_char(C)
int rl_show_char(int c)
"message(FMT[, ...])"
int rl_message(str fmt, ...)
"clear_message"
int rl_clear_message()
"save_prompt"
void rl_save_prompt()
"restore_prompt"
void rl_restore_prompt()
"expand_prompt(PROMPT)"
int rl_expand_prompt(str prompt)
"set_prompt(PROMPT)"
int rl_set_prompt(const str prompt) # GRL 4.2
Modifying Text
"insert_text(TEXT)"
int rl_insert_text(str text)
"delete_text([START [,END]])"
int rl_delete_text(int start = 0, int end = rl_end)
"copy_text([START [,END]])"
str rl_copy_text(int start = 0, int end = rl_end)
"kill_text([START [,END]])"
int rl_kill_text(int start = 0, int end = rl_end)
"push_macro_input(MACRO)"
int rl_push_macro_input(str macro)
Character Input
"read_key"
int rl_read_key()
"getc(STREAM)"
int rl_getc(FILE *STREAM)
stuff_char(C)
int rl_stuff_char(int c)
execute_next(C)
int rl_execute_next(int c)
"clear_pending_input()"
int rl_clear_pending_input() # GRL 4.2
"set_keyboard_input_timeout(uSEC)"
int rl_set_keyboard_input_timeout(int usec) # GRL 4.2
Terminal Management
"prep_terminal(META_FLAG)"
void rl_prep_terminal(int META_FLAG)
"deprep_terminal()"
void rl_deprep_terminal()
"tty_set_default_bindings([MAP])"
void rl_tty_set_default_bindings([Keymap|str map = rl_get_keymap()]) # GRL 4.0
"tty_unset_default_bindings([MAP])"
void rl_tty_unset_default_bindings([Keymap|str map = rl_get_keymap()]) # GRL 5.0
"tty_set_echoing(VALUE)"
int rl_tty_set_echoing(int value) # GRL 7.0
"reset_terminal([TERMINAL_NAME])"
int rl_reset_terminal(str terminal_name = getenv($TERM))
Utility Functions
"save_state(READLINE_STATE)"
READLINE_STATE rl_save_state() # GRL 6.0
"restore_state(READLINE_STATE)"
int rl_restore_state(READLINE_STATE) # GRL 6.0
"free(MEM)"
Not implemented since not required for Perl.
int rl_free(void *mem) # GRL 6.0
"replace_line(TEXT [,CLEAR_UNDO])"
int rl_replace_line(str text, int clear_undo = 0) # GRL 4.3
"extend_line_buffer(LEN)"
Not implemented since not required for Perl.
int rl_extend_line_buffer(int len)
"initialize"
int rl_initialize()
"ding"
int rl_ding()alphabetic(C)
int rl_alphabetic(int C) # GRL 4.2
"display_match_list(MATCHES [,LEN [,MAX]])"
void rl_display_match_list(\@matches, len = $#maches, max) # GRL 4.0
Since the first element of an array @matches as treated as a
possible completion, it is not displayed. See the descriptions of
"completion_matches()". When "MAX" is omitted, the max length of
an item in @matches is used.
Miscellaneous Functions
"macro_bind(KEYSEQ, MACRO [,MAP])"
int rl_macro_bind(const str keyseq, const str macro, Keymap map)
"macro_dumper(READABLE)"
int rl_macro_dumper(int readline)
"variable_bind(VARIABLE, VALUE)"
int rl_variable_bind(const str variable, const str value)
"variable_value(VARIABLE)"
str rl_variable_value(const str variable) # GRL 5.1
"variable_dumper(READABLE)"
int rl_variable_dumper(int readline)
"set_paren_blink_timeout(uSEC)"
int rl_set_paren_blink_timeout(usec) # GRL 4.2
"get_termcap(cap)"
str rl_get_termcap(cap)
"clear_history"
void rl_clear_history() # GRL 6.3
Alternate Interface
"callback_handler_install(PROMPT, LHANDLER)"
void rl_callback_handler_install(str prompt, pfunc lhandler)
"callback_read_char"
void rl_callback_read_char()
"callback_sigcleanup" # GRL 7.0
void rl_callback_sigcleanup()
"callback_handler_remove"
void rl_callback_handler_remove()
Readline Signal Handling
"pending_signal()"
int rl_pending_signal() # GRL 7.0
"cleanup_after_signal"
void rl_cleanup_after_signal() # GRL 4.0
"free_line_state"
void rl_free_line_state() # GRL 4.0
"reset_after_signal"
void rl_reset_after_signal() # GRL 4.0
"echo_signal_char"
void rl_echo_signal_char(int sig) # GRL 6.0
"resize_terminal"
void rl_resize_terminal() # GRL 4.0
"set_screen_size(ROWS, COLS)"
void rl_set_screen_size(int ROWS, int COLS) # GRL 4.2
"get_screen_size()"
(int rows, int cols) rl_get_screen_size() # GRL 4.2
"reset_screen_size()"
void rl_reset_screen_size() # GRL 5.1
"set_signals"
int rl_set_signals() # GRL 4.0
"clear_signals"
int rl_clear_signals() # GRL 4.0
Completion Functions
"complete_internal([WHAT_TO_DO])"
int rl_complete_internal(int what_to_do = TAB)
"completion_mode(FUNCTION)"
int rl_completion_mode(FunctionPtr|str function) # GRL 4.3
"completion_matches(TEXT [,FUNC])"
(@str) rl_completion_matches(str text,
pfunc func = filename_completion_function)
"filename_completion_function(TEXT, STATE)"
str rl_filename_completion_function(str text, int state)
"username_completion_function(TEXT, STATE)"
str rl_username_completion_function(str text, int state)
"list_completion_function(TEXT, STATE)"
str list_completion_function(str text, int state) # TRG original
History Functions
Initializing History and State Management
"using_history"
void using_history()
"history_get_history_state"
HISTORY_STATE history_get_hitory_state() # GRL 6.3
"history_set_history_state"
void history_set_hitory_state(HISTORY_STATE) # GRL 6.3
History List Management
"add_history(STRING)"
void add_history(str string)
"add_history_time(STRING)"
void add_history_time(str string) # GRL 5.0
"remove_history(WHICH)"
str remove_history(int which)
"free_history(HISTENT)"
Not implemented since Term::ReadLine::Gnu does not support the
member 'data' of HIST_ENTRY structure. remove_history() frees
the memory.
histdata_t free_history_entry(HIST_ENTRY *histent) # GRL 5.0
"replace_history_entry(WHICH, STRING)"
str replace_history_entry(int which, str string)
"clear_history"
void clear_history()
"StifleHistory(MAX)"
int stifle_history(int max|undef)
stifles the history list, remembering only the last "MAX" entries.
If "MAX" is undef, remembers all entries. This is a replacement of
"unstifle_history()".
"unstifle_history"
int unstifle_history()
This is equivalent with "stifle_history(undef)".
"history_is_stifled"
int history_is_stifled()
"SetHistory(LINE1 [, LINE2, ...])"
sets the history of input, from where it can be used if the actual
"readline" is present.
Information About the History List
"history_list"
Not implemented since not required for Perl.
HIST_ENTRY **history_list()
"where_history"
int where_history()
"current_history"
str current_history()
"history_get(OFFSET)"
str history_get(offset)
"history_get_time(OFFSET)"
time_t history_get_time(offset) # GRL 5.0
"history_total_bytes"
int history_total_bytes()
"GetHistory"
returns the history of input as a list, if actual "readline" is
present.
Moving Around the History List
"history_set_pos(POS)"
int history_set_pos(int pos)
"previous_history"
str previous_history()
"next_history"
str next_history()
Searching the History List
"history_search(STRING [,DIRECTION])"
int history_search(str string, int direction = -1)
"history_search_prefix(STRING [,DIRECTION])"
int history_search_prefix(str string, int direction = -1)
"history_search_pos(STRING [,DIRECTION [,POS]])"
int history_search_pos(str string,
int direction = -1,
int pos = where_history())
Managing the History File
"ReadHistory([FILENAME [,FROM [,TO]]])"
int read_history(str filename = '~/.history',
int from = 0, int to = -1)
int read_history_range(str filename = '~/.history',
int from = 0, int to = -1)
adds the contents of "FILENAME" to the history list, a line at a
time. If "FILENAME" is false, then read from ~/.history. Start
reading at line "FROM" and end at "TO". If "FROM" is omitted or
zero, start at the beginning. If "TO" is omitted or less than
"FROM", then read until the end of the file. Returns true if
successful, or false if not. "read_history()" is an alias of
"read_history_range()".
"WriteHistory([FILENAME])"
int write_history(str filename = '~/.history')
writes the current history to "FILENAME", overwriting "FILENAME" if
necessary. If "FILENAME" is false, then write the history list to
~/.history. Returns true if successful, or false if not.
"append_history(NELEMENTS [,FILENAME])"
int append_history(int nelements, str filename = '~/.history')
"history_truncate_file([FILENAME [,NLINES]])"
int history_truncate_file(str filename = '~/.history',
int nlines = 0)
History Expansion
"history_expand(STRING)"
(int result, str expansion) history_expand(str string)
Note that this function returns "expansion" in the scalar context.
"get_history_event(STRING, CINDEX [,QCHAR])"
(str text, int cindex) = get_history_event(str string,
int cindex,
char qchar = '\0')
"history_tokenize(STRING)"
(@str) history_tokenize(str string)
"history_arg_extract(STRING, [FIRST [,LAST]])"
str history_arg_extract(str string, int first = 0, int last = '$')
"Term::ReadLine::Gnu" Variables
Following GNU Readline/History Library variables can be accessed by a
Perl program. See GNU Readline Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/readline.html> and GNU
History Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/history.html> for details
of each variable. You can access them by using "Attribs" methods.
Names of keys in this hash conform to standard conventions with the
leading "rl_" stripped.
Examples:
$attribs = $term->Attribs;
$v = $attribs->{library_version}; # rl_library_version
$v = $attribs->{history_base}; # history_base
Readline Variables
str rl_line_buffer
int rl_point
int rl_end
int rl_mark
int rl_done
int rl_num_chars_to_read (GRL 4.1)
int rl_pending_input
int rl_dispatching
int rl_erase_empty_line (GRL 4.0)
str rl_prompt (read only)
str rl_display_prompt
int rl_already_prompted (GRL 4.1)
str rl_library_version (read only)
int rl_readline_version (read only)
int rl_gnu_readline_p (GRL 4.1, read only)
str rl_terminal_name
str rl_readline_name
filehandle rl_instream
filehandle rl_outstream
int rl_prefer_env_winsize (GRL 5.1)
pfunc rl_last_func (GRL 4.2, read only)
pfunc rl_startup_hook
pfunc rl_pre_input_hook (GRL 4.0)
pfunc rl_event_hook
pfunc rl_getc_function
pfunc rl_signal_event_hook (GRL 6.3)
pfunc rl_input_available_hook (GRL 6.3)
pfunc rl_redisplay_function
pfunc rl_prep_term_function (GRL 2.1)
pfunc rl_deprep_term_function (GRL 2.1)
Keymap rl_executing_keymap (read only)
Keymap rl_binding_keymap (read only)
str rl_executing_macro (GRL 4.2, read only)
int rl_executing_key (GRL 6.3, read only)
str rl_executing_keyseq (GRL 6.3, read only)
int rl_key_sequence_length (read only)
int rl_readline_state (GRL 4.2)
int rl_explicit_arg (read only)
int rl_numeric_arg (read only)
int rl_editing_mode (read only)
Signal Handling Variables
int rl_catch_signals (GRL 4.0)
int rl_catch_sigwinch (GRL 4.0)
int rl_persistent_signal_handlers (GRL 7.0)
int rl_change_environment (GRL 6.3)
Completion Variables
pfunc rl_completion_entry_function
pfunc rl_attempted_completion_function
pfunc rl_filename_quoting_function
pfunc rl_filename_dequoting_function
pfunc rl_char_is_quoted_p
pfunc rl_ignore_some_completions_function
pfunc rl_directory_completion_hook
pfunc rl_directory_rewrite_hook (GRL 4.2)
pfunc rl_filename_stat_hook (GRL 6.3)
pfunc rl_filename_rewrite_hook (GRL 6.1)
pfunc rl_completion_display_matches_hook (GRL 4.0)
str rl_basic_word_break_characters
str rl_basic_quote_characters
str rl_completer_word_break_characters
pfunc rl_completion_word_break_hook (GRL 5.0)
str rl_completer_quote_characters
str rl_filename_quote_characters
str rl_special_prefixes
int rl_completion_query_items
int rl_completion_append_character
int rl_completion_suppress_append (GRL 4.3)
int rl_completion_quote_character (GRL 5.0, read only)
int rl_completion_suppress_quote (GRL 5.0)
int rl_completion_found_quote (GRL 5.0, read only)
int rl_completion_mark_symlink_dirs (GRL 4.3)
int rl_ignore_completion_duplicates
int rl_filename_completion_desired
int rl_filename_quoting_desired
int rl_attempted_completion_over
int rl_sort_completion_matches (GRL 6.0)
int rl_completion_type (read only)
int rl_completion_invoking_key (GRL 6.0, read only)
int rl_inhibit_completion
History Variables
int history_base
int history_length
int history_max_entries (called `max_input_history', read only)
int history_write_timestamps (GRL 5.0)
char history_expansion_char
char history_subst_char
char history_comment_char
str history_word_delimiters (GRL 4.2)
str history_search_delimiter_chars
str history_no_expand_chars
int history_quotes_inhibit_expansion
pfunc history_inhibit_expansion_function
Function References
rl_getc
rl_redisplay
rl_callback_read_char
rl_display_match_list
rl_filename_completion_function
rl_username_completion_function
list_completion_function
shadow_redisplay
Tk_getc
Custom Completion
In this section variables and functions for custom completion are
described along with examples.
Most of descriptions in this section came from GNU Readline Library
Manual <http://cnswww.cns.cwru.edu/php/chet/readline/readline.html>.
"completion_entry_function"
This variable holds reference refers to a generator function for
"completion_matches()".
A generator function is called repeatedly from
"completion_matches()", returning a string each time. The
arguments to the generator function are "TEXT" and "STATE". "TEXT"
is the partial word to be completed. "STATE" is zero the first
time the function is called, allowing the generator to perform any
necessary initialization, and a positive non-zero integer for each
subsequent call. When the generator function returns "undef" this
signals "completion_matches()" that there are no more possibilities
left.
If this variable set to undef, built-in
"filename_completion_function" is used.
A sample generator function, "list_completion_function", is defined
in Gnu.pm. You can use it as follows;
use Term::ReadLine;
...
my $term = new Term::ReadLine 'sample';
my $attribs = $term->Attribs;
...
$attribs->{completion_entry_function} =
$attribs->{list_completion_function};
...
$attribs->{completion_word} =
[qw(reference to a list of words which you want to use for completion)];
$term->readline("custom completion>");
See also "completion_matches".
"attempted_completion_function"
A reference to an alternative function to create matches.
The function is called with "TEXT", "LINE_BUFFER", "START", and
"END". "LINE_BUFFER" is a current input buffer string. "START"
and "END" are indices in "LINE_BUFFER" saying what the boundaries
of "TEXT" are.
If this function exists and returns null list or "undef", or if
this variable is set to "undef", then an internal function
"rl_complete()" will call the value of "completion_entry_function"
to generate matches, otherwise the array of strings returned will
be used.
The default value of this variable is "undef". You can use it as
follows;
use Term::ReadLine;
...
my $term = new Term::ReadLine 'sample';
my $attribs = $term->Attribs;
...
sub sample_completion {
my ($text, $line, $start, $end) = @_;
# If first word then username completion, else filename completion
if (substr($line, 0, $start) =~ /^\s*$/) {
return $term->completion_matches($text,
$attribs->{'username_completion_function'});
} else {
return ();
}
}
...
$attribs->{attempted_completion_function} = \&sample_completion;
"completion_matches(TEXT, ENTRY_FUNC)"
Returns an array of strings which is a list of completions for
"TEXT". If there are no completions, returns "undef". The first
entry in the returned array is the substitution for "TEXT". The
remaining entries are the possible completions.
"ENTRY_FUNC" is a generator function which has two arguments, and
returns a string. The first argument is "TEXT". The second is a
state argument; it is zero on the first call, and non-zero on
subsequent calls. "ENTRY_FUNC" returns "undef" to the caller when
there are no more matches.
If the value of "ENTRY_FUNC" is undef, built-in
"filename_completion_function" is used.
"completion_matches" is a Perl wrapper function of an internal
function "completion_matches()". See also
"completion_entry_function".
"completion_function"
A variable whose content is a reference to a function which returns
a list of candidates to complete.
This variable is compatible with Term::ReadLine::Perl
<http://search.cpan.org/dist/Term-ReadLine-Perl/> and very easy to
use.
use Term::ReadLine;
...
my $term = new Term::ReadLine 'sample';
my $attribs = $term->Attribs;
...
$attribs->{completion_function} = sub {
my ($text, $line, $start) = @_;
return qw(a list of candidates to complete);
};
"list_completion_function(TEXT, STATE)"
A sample generator function defined by "Term::ReadLine::Gnu".
Example code at "completion_entry_function" shows how to use this
function.
"Term::ReadLine::Gnu" Specific Features
"Term::ReadLine::Gnu" Specific Functions
"CallbackHandlerInstall(PROMPT, LHANDLER)"
This method provides the function "rl_callback_handler_install()"
with the following additional feature compatible with "readline"
method; ornament feature, Term::ReadLine::Perl
<http://search.cpan.org/dist/Term-ReadLine-Perl/> compatible
completion function, history expansion, and addition to history
buffer.
"call_function(FUNCTION, [COUNT [,KEY]])"
int rl_call_function(FunctionPtr|str function, count = 1, key = -1)
"get_all_function_names"
Returns a list of all function names.
"shadow_redisplay"
A redisplay function for password input. You can use it as
follows;
$attribs->{redisplay_function} = $attribs->{shadow_redisplay};
$line = $term->readline("password> ");
"filename_list"
Returns candidates of filenames to complete. This function can be
used with "completion_function" and is implemented for the
compatibility with Term::ReadLine::Perl
<http://search.cpan.org/dist/Term-ReadLine-Perl/>.
"list_completion_function"
See the description of section "Custom Completion".
"Term::ReadLine::Gnu" Specific Variables
"do_expand"
When true, the history expansion is enabled. By default false.
"completion_function"
See the description of section "Custom Completion".
"completion_word"
A reference to a list of candidates to complete for
"list_completion_function".
"Term::ReadLine::Gnu" Specific Commands
"history-expand-line"
The equivalent of the Bash "history-expand-line" editing command.
"operate-and-get-next"
The equivalent of the Korn shell
"operate-and-get-next-history-line" editing command and the Bash
"operate-and-get-next".
This command is bound to "\C-o" by default for the compatibility
with the Bash and Term::ReadLine::Perl
<http://search.cpan.org/dist/Term-ReadLine-Perl/>.
"display-readline-version"
Shows the version of "Term::ReadLine::Gnu" and the one of the GNU
Readline Library.
"change-ornaments"
Change ornaments interactively.
FILES
~/.inputrc
Readline init file. Using this file it is possible that you would
like to use a different set of key bindings. When a program which
uses the GNU Readline library starts up, the init file is read, and
the key bindings are set.
The conditional init constructs is supported. The program name
which is specified by the first argument of "new" method is used as
the application construct.
For example, when your program calls "new" method as follows;
...
$term = new Term::ReadLine 'PerlSh';
...
your ~/.inputrc can define key bindings only for the program as
follows;
...
$if PerlSh
Meta-Rubout: backward-kill-word
"\C-x\C-r": re-read-init-file
"\e[11~": "Function Key 1"
$endif
...
For further details, see the section "Readline Init File" in the
GNU Readline Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/readline.html>
EXPORTS
No symbols are exported by default. The following tags are defined and
their symbols can be exported.
prompt
RL_PROMPT_START_IGNORE RL_PROMPT_END_IGNORE
match_type
NO_MATCH SINGLE_MATCH MULT_MATCH
keymap_type
ISFUNC ISKMAP ISMACR
undo_code
UNDO_DELETE UNDO_INSERT UNDO_BEGIN UNDO_END
rl_state
RL_STATE_NONE RL_STATE_INITIALIZING RL_STATE_INITIALIZED
RL_STATE_TERMPREPPED RL_STATE_READCMD RL_STATE_METANEXT
RL_STATE_DISPATCHING RL_STATE_MOREINPUT RL_STATE_ISEARCH
RL_STATE_NSEARCH RL_STATE_SEARCH RL_STATE_NUMERICARG
RL_STATE_MACROINPUT RL_STATE_MACRODEF RL_STATE_OVERWRITE
RL_STATE_COMPLETING RL_STATE_SIGHANDLER RL_STATE_UNDOING
RL_STATE_INPUTPENDING RL_STATE_TTYCSAVED RL_STATE_CALLBACK
RL_STATE_VIMOTION RL_STATE_MULTIKEY RL_STATE_VICMDONCE
RL_STATE_CHARSEARCH RL_STATE_REDISPLAYING RL_STATE_DONE
They can be exported as follows;
use Term::ReadLine;
BEGIN {
import Term::ReadLine::Gnu qw(:keymap_type RL_STATE_INITIALIZED);
}
ENVIRONMENT
The environment variable "PERL_RL" governs which ReadLine clone is
loaded. See the ENVIRONMENT section on Term::ReadLine
<http://search.cpan.org/dist/Term-ReadLine/> for further details.
SEE ALSOTerm::ReadLine::Gnu Project Home Page
<http://sourceforge.net/projects/perl-trg/>
GNU Readline Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/readline.html>
GNU History Library Manual
<http://cnswww.cns.cwru.edu/php/chet/readline/history.html>
Sample and test programs (eg/* and t/*) in the "Term::ReadLine::Gnu"
distribution <http://search.cpan.org/dist/Term-ReadLine-Gnu/>
Term::ReadLine <http://search.cpan.org/dist/Term-ReadLine/>
Works which use Term::ReadLine::Gnu
Distributions which depend on Term::ReadLine::Gnu on CPAN
<http://www.cpan.org/>
<https://metacpan.org/requires/distribution/Term-ReadLine-Gnu>
Perl Debugger <http://perldoc.perl.org/perldebug.html>
perl -d
Perl Shell (psh) <http://gnp.github.io/psh/>
The Perl Shell is a shell that combines the interactive nature
of a Unix shell with the power of Perl.
A programmable completion feature compatible with bash is
implemented.
SPP (Synopsys Plus Perl)
<http://vlsiweb.stanford.edu/~jsolomon/SPP/>
SPP (Synopsys Plus Perl) is a Perl module that wraps around
Synopsys' shell programs. SPP is inspired by the original
dc_perl written by Steve Golson, but it's an entirely new
implementation. Why is it called SPP and not dc_perl? Well,
SPP was written to wrap around any of Synopsys' shells.
PFM (Personal File Manager for Unix/Linux) <http://p-f-
m.sourceforge.net/>
Pfm is a terminal-based file manager written in Perl, based on
PFM.COM for MS-DOS (originally by Paul Culley and Henk de
Heer).
The soundgrab <http://brittonkerin.com/soundgrab/soundgrab.html>
soundgrab is designed to help you slice up a big long raw audio
file (by default 44.1 kHz 2 channel signed sixteen bit little
endian) and save your favorite sections to other files. It does
this by providing you with a cassette player like command line
interface.
PDL (The Perl Data Language) <http://pdl.perl.org/>
PDL (``Perl Data Language'') gives standard Perl the ability to
compactly store and speedily manipulate the large N-dimensional
data arrays which are the bread and butter of scientific
computing.
PIQT (Perl Interactive DBI Query Tool)
<http://piqt.sourceforge.net/>
PIQT is an interactive query tool using the Perl DBI database
interface. It supports ReadLine, provides a built in scripting
language with a Lisp like syntax, an online help system, and
uses wrappers to interface to the DBD modules.
vshnu (the New Visual Shell)
<http://www.cs.indiana.edu/~kinzler/vshnu/>
A visual shell and CLI shell supplement.
If you know any other works you recommend, please let me know.
AUTHOR
Hiroo Hayashi "<hiroo.hayashi@computer.org>"
<http://search.cpan.org/~hayashi/>
TODO
GTK+ support in addition to Tk.
BUGS
Submit a bug report to rt.cpan.org
<https://rt.cpan.org/Dist/Display.html?Name=Term-ReadLine-Gnu>.
"add_defun()" can define up to 16 functions.
Some functions and variables do not have test code yet. Your
contribution is welcome. See t/readline.t for details.
If the pager command (| or ||) in Perl debugger causes segmentation
fault, you need to fix perl5db.pl. See
<https://rt.perl.org/Public/Bug/Display.html?id=121456> for details.
LICENSE
Copyright (c) 1996-2016 Hiroo Hayashi. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.26.1 2017-11-24 Gnu(3pm)
