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Module: Readline

Relationships & Source Files
Defined in: ext/readline/readline.c

Overview

The Readline module provides interface for GNU Readline. This module defines a number of methods to facilitate completion and accesses input history from the Ruby interpreter. This module supported Edit Line(libedit) too. libedit is compatible with GNU Readline.

GNU Readline

www.gnu.org/directory/readline.html

libedit

www.thrysoee.dk/editline/

Reads one inputted line with line edit by .readline method. At this time, the facilitatation completion and the key bind like Emacs can be operated like GNU Readline.

require "readline"
while buf = Readline.readline("> ", true)
  p buf
end

The content that the user input can be recorded to the history. The history can be accessed by ::HISTORY constant.

require "readline"
while buf = Readline.readline("> ", true)
  p Readline::HISTORY.to_a
  print("-> ", buf, "\n")
end

Documented by Kouji Takao <kouji dot takao at gmail dot com>.

Constant Summary

Class Attribute Summary

Class Method Summary

Class Attribute Details

.basic_quote_charactersString (rw)

Gets a list of quote characters which can cause a word break.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1520

static VALUE
readline_s_get_basic_quote_characters(VALUE self, VALUE str)
{
    if (rl_basic_quote_characters == NULL)
        return Qnil;
    return rb_locale_str_new_cstr(rl_basic_quote_characters);
}

.basic_quote_characters=(string) (rw)

Sets a list of quote characters which can cause a word break.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1487

static VALUE
readline_s_set_basic_quote_characters(VALUE self, VALUE str)
{
    static char *basic_quote_characters = NULL;

    OutputStringValue(str);
    if (basic_quote_characters == NULL) {
        basic_quote_characters =
            ALLOC_N(char, RSTRING_LEN(str) + 1);
    }
    else {
        REALLOC_N(basic_quote_characters, char, RSTRING_LEN(str) + 1);
    }
    strncpy(basic_quote_characters,
            RSTRING_PTR(str), RSTRING_LEN(str));
    basic_quote_characters[RSTRING_LEN(str)] = '\0';
    rl_basic_quote_characters = basic_quote_characters;

    return self;
}

.basic_word_break_charactersString (rw)

Gets the basic list of characters that signal a break between words for the completer routine.

Raises NotImplementedError if the using readline library does not support.

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# File 'ext/readline/readline.c', line 1350

static VALUE
readline_s_get_basic_word_break_characters(VALUE self, VALUE str)
{
    if (rl_basic_word_break_characters == NULL)
        return Qnil;
    return rb_locale_str_new_cstr(rl_basic_word_break_characters);
}

.basic_word_break_characters=(string) (rw)

Sets the basic list of characters that signal a break between words for the completer routine. The default is the characters which break words for completion in Bash: “ tn"\'`@$><=;|&{(”.

Raises NotImplementedError if the using readline library does not support.

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# File 'ext/readline/readline.c', line 1317

static VALUE
readline_s_set_basic_word_break_characters(VALUE self, VALUE str)
{
    static char *basic_word_break_characters = NULL;

    OutputStringValue(str);
    if (basic_word_break_characters == NULL) {
        basic_word_break_characters =
            ALLOC_N(char, RSTRING_LEN(str) + 1);
    }
    else {
        REALLOC_N(basic_word_break_characters, char, RSTRING_LEN(str) + 1);
    }
    strncpy(basic_word_break_characters,
            RSTRING_PTR(str), RSTRING_LEN(str));
    basic_word_break_characters[RSTRING_LEN(str)] = '\0';
    rl_basic_word_break_characters = basic_word_break_characters;
    return self;
}

.completer_quote_charactersString (rw)

Gets a list of characters which can be used to quote a substring of the line.

Raises NotImplementedError if the using readline library does not support.

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# File 'ext/readline/readline.c', line 1576

static VALUE
readline_s_get_completer_quote_characters(VALUE self, VALUE str)
{
    if (rl_completer_quote_characters == NULL)
        return Qnil;
    return rb_locale_str_new_cstr(rl_completer_quote_characters);
}

.completer_quote_characters=(string) (rw)

Sets a list of characters which can be used to quote a substring of the line. Completion occurs on the entire substring, and within the substring .completer_word_break_characters are treated as any other character, unless they also appear within this list.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1543

static VALUE
readline_s_set_completer_quote_characters(VALUE self, VALUE str)
{
    static char *completer_quote_characters = NULL;

    OutputStringValue(str);
    if (completer_quote_characters == NULL) {
        completer_quote_characters =
            ALLOC_N(char, RSTRING_LEN(str) + 1);
    }
    else {
        REALLOC_N(completer_quote_characters, char, RSTRING_LEN(str) + 1);
    }
    strncpy(completer_quote_characters, RSTRING_PTR(str), RSTRING_LEN(str));
    completer_quote_characters[RSTRING_LEN(str)] = '\0';
    rl_completer_quote_characters = completer_quote_characters;

    return self;
}

.completer_word_break_charactersString (rw)

Gets the basic list of characters that signal a break between words for rl_complete_internal().

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1405

static VALUE
readline_s_get_completer_word_break_characters(VALUE self, VALUE str)
{
    if (rl_completer_word_break_characters == NULL)
        return Qnil;
    return rb_locale_str_new_cstr(rl_completer_word_break_characters);
}

.completer_word_break_characters=(string) (rw)

Sets the basic list of characters that signal a break between words for rl_complete_internal(). The default is the value of .basic_word_break_characters.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1372

static VALUE
readline_s_set_completer_word_break_characters(VALUE self, VALUE str)
{
    static char *completer_word_break_characters = NULL;

    OutputStringValue(str);
    if (completer_word_break_characters == NULL) {
        completer_word_break_characters =
            ALLOC_N(char, RSTRING_LEN(str) + 1);
    }
    else {
        REALLOC_N(completer_word_break_characters, char, RSTRING_LEN(str) + 1);
    }
    strncpy(completer_word_break_characters,
            RSTRING_PTR(str), RSTRING_LEN(str));
    completer_word_break_characters[RSTRING_LEN(str)] = '\0';
    rl_completer_word_break_characters = completer_word_break_characters;
    return self;
}

.completion_append_characterString (rw)

Returns a string containing a character to be appended on completion. The default is a space (“ ”).

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1291

static VALUE
readline_s_get_completion_append_character(VALUE self)
{
    char buf[1];

    if (rl_completion_append_character == '\0')
        return Qnil;

    buf[0] = (char) rl_completion_append_character;
    return rb_locale_str_new(buf, 1);
}

.completion_append_character=(char) (rw)

Specifies a character to be appended on completion. Nothing will be appended if an empty string (“”) or nil is specified.

For example:

require "readline"

Readline.readline("> ", true)
Readline.completion_append_character = " "

Result:

>
Input "/var/li".

> /var/li
Press TAB key.

> /var/lib
Completes "b" and appends " ". So, you can continuously input "/usr".

> /var/lib /usr

NOTE: Only one character can be specified. When “string” is specified, sets only “s” that is the first.

require "readline"

Readline.completion_append_character = "string"
p Readline.completion_append_character # => "s"

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1261

static VALUE
readline_s_set_completion_append_character(VALUE self, VALUE str)
{
    if (NIL_P(str)) {
        rl_completion_append_character = '\0';
    }
    else {
        OutputStringValue(str);
        if (RSTRING_LEN(str) == 0) {
            rl_completion_append_character = '\0';
        } else {
            rl_completion_append_character = RSTRING_PTR(str)[0];
        }
    }
    return self;
}

.completion_case_foldBoolean (rw)

Returns true if completion ignores case. If no, returns false.

NOTE: Returns the same object that is specified by .completion_case_fold= method.

require "readline"

Readline.completion_case_fold = "This is a String."
p Readline.completion_case_fold # => "This is a String."
[ GitHub ]

  
# File 'ext/readline/readline.c', line 925

static VALUE
readline_s_get_completion_case_fold(VALUE self)
{
    return rb_attr_get(mReadline, completion_case_fold);
}

.completion_case_fold=(bool) (rw)

Sets whether or not to ignore case on completion.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 905

static VALUE
readline_s_set_completion_case_fold(VALUE self, VALUE val)
{
    return rb_ivar_set(mReadline, completion_case_fold, val);
}

.completion_procProc (rw)

Returns the completion Proc object.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 848

static VALUE
readline_s_get_completion_proc(VALUE self)
{
    return rb_attr_get(mReadline, completion_proc);
}

.completion_proc=(proc) (rw)

Specifies a Proc object proc to determine completion behavior. It should take input string and return an array of completion candidates.

The default completion is used if proc is nil.

The String that is passed to the Proc depends on the .completer_word_break_characters property. By default the word under the cursor is passed to the Proc. For example, if the input is “foo bar” then only “bar” would be passed to the completion Proc.

Upon successful completion the .completion_append_character will be appended to the input so the user can start working on their next argument.

Examples

Completion for a Static List
require 'readline'

LIST = [
  'search', 'download', 'open',
  'help', 'history', 'quit',
  'url', 'next', 'clear',
  'prev', 'past'
].sort

comp = proc { |s| LIST.grep(/^#{Regexp.escape(s)}/) }

Readline.completion_append_character = " "
Readline.completion_proc = comp

while line = Readline.readline('> ', true)
  p line
end
Completion For Directory Contents
require 'readline'

Readline.completion_append_character = " "
Readline.completion_proc = Proc.new do |str|
  Dir[str+'*'].grep(/^#{Regexp.escape(str)}/)
end

while line = Readline.readline('> ', true)
  p line
end

Autocomplete strategies

When working with auto-complete there are some strategies that work well. To get some ideas you can take a look at the completion.rb file for irb.

The common strategy is to take a list of possible completions and filter it down to those completions that start with the user input. In the above examples Enumerator.grep is used. The input is escaped to prevent Regexp special characters from interfering with the matching.

It may also be helpful to use the Abbrev library to generate completions.

Raises ArgumentError if proc does not respond to the call method.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 835

static VALUE
readline_s_set_completion_proc(VALUE self, VALUE proc)
{
    mustbe_callable(proc);
    return rb_ivar_set(mReadline, completion_proc, proc);
}

.emacs_editing_modenil (readonly)

Specifies Emacs editing mode. The default is this mode. See the manual of GNU Readline for details of Emacs editing mode.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1196

static VALUE
readline_s_emacs_editing_mode(VALUE self)
{
    rl_emacs_editing_mode(1,0);
    return Qnil;
}

.emacs_editing_mode?Boolean (readonly)

Returns true if emacs mode is active. Returns false if not.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1215

static VALUE
readline_s_emacs_editing_mode_p(VALUE self)
{
    return rl_editing_mode == 1 ? Qtrue : Qfalse;
}

.filename_quote_charactersString (rw)

Gets a list of characters that cause a filename to be quoted by the completer when they appear in a completed filename.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1630

static VALUE
readline_s_get_filename_quote_characters(VALUE self, VALUE str)
{
    if (rl_filename_quote_characters == NULL)
        return Qnil;
    return rb_locale_str_new_cstr(rl_filename_quote_characters);
}

.filename_quote_characters=(string) (rw)

Sets a list of characters that cause a filename to be quoted by the completer when they appear in a completed filename. The default is nil.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1597

static VALUE
readline_s_set_filename_quote_characters(VALUE self, VALUE str)
{
    static char *filename_quote_characters = NULL;

    OutputStringValue(str);
    if (filename_quote_characters == NULL) {
        filename_quote_characters =
            ALLOC_N(char, RSTRING_LEN(str) + 1);
    }
    else {
        REALLOC_N(filename_quote_characters, char, RSTRING_LEN(str) + 1);
    }
    strncpy(filename_quote_characters, RSTRING_PTR(str), RSTRING_LEN(str));
    filename_quote_characters[RSTRING_LEN(str)] = '\0';
    rl_filename_quote_characters = filename_quote_characters;

    return self;
}

.input=(input) (writeonly)

Specifies a File object input that is input stream for .readline method.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 550

static VALUE
readline_s_set_input(VALUE self, VALUE input)
{
    rb_io_t *ifp;
    int fd;
    FILE *f;

    if (NIL_P(input)) {
        clear_rl_instream();
    }
    else {
        Check_Type(input, T_FILE);
        GetOpenFile(input, ifp);
        clear_rl_instream();
        fd = rb_cloexec_dup(ifp->fd);
        if (fd == -1)
            rb_sys_fail("dup");
        f = fdopen(fd, "r");
        if (f == NULL) {
            int save_errno = errno;
            close(fd);
            rb_syserr_fail(save_errno, "fdopen");
        }
        rl_instream = readline_rl_instream = f;
        readline_instream = input;
    }
    return input;
}

.output=(output) (writeonly)

Specifies a File object output that is output stream for .readline method.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 586

static VALUE
readline_s_set_output(VALUE self, VALUE output)
{
    rb_io_t *ofp;
    int fd;
    FILE *f;

    if (NIL_P(output)) {
        clear_rl_outstream();
    }
    else {
        Check_Type(output, T_FILE);
        GetOpenFile(output, ofp);
        clear_rl_outstream();
        fd = rb_cloexec_dup(ofp->fd);
        if (fd == -1)
            rb_sys_fail("dup");
        f = fdopen(fd, "w");
        if (f == NULL) {
            int save_errno = errno;
            close(fd);
            rb_syserr_fail(save_errno, "fdopen");
        }
        rl_outstream = readline_rl_outstream = f;
        readline_outstream = output;
    }
    return output;
}

.pointInteger (rw)

Returns the index of the current cursor position in .line_buffer.

The index in .line_buffer which matches the start of input-string passed to completion_proc is computed by subtracting the length of input-string from point.

start = (the length of input-string) - Readline.point

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 972

static VALUE
readline_s_get_point(VALUE self)
{
    return INT2NUM(rl_point);
}

.point=(int) (rw)

Set the index of the current cursor position in .line_buffer.

Raises NotImplementedError if the using readline library does not support.

See .point.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 989

static VALUE
readline_s_set_point(VALUE self, VALUE pos)
{
    rl_point = NUM2INT(pos);
    return pos;
}

.pre_input_hookProc (rw)

Returns a Proc object proc to call after the first prompt has been printed and just before readline starts reading input characters. The default is nil.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 647

static VALUE
readline_s_get_pre_input_hook(VALUE self)
{
    return rb_attr_get(mReadline, id_pre_input_hook);
}

.pre_input_hook=(proc) (rw)

Specifies a Proc object proc to call after the first prompt has been printed and just before readline starts reading input characters.

See GNU Readline's rl_pre_input_hook variable.

Raises ArgumentError if proc does not respond to the call method.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 630

static VALUE
readline_s_set_pre_input_hook(VALUE self, VALUE proc)
{
    mustbe_callable(proc);
    return rb_ivar_set(mReadline, id_pre_input_hook, proc);
}

.quoting_detection_procProc (rw)

Returns the quoting detection Proc object.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 889

static VALUE
readline_s_get_quoting_detection_proc(VALUE self)
{
    return rb_attr_get(mReadline, quoting_detection_proc);
}

.quoting_detection_proc=(proc) (rw)

Specifies a Proc object proc to determine if a character in the user's input is escaped. It should take the user's input and the index of the character in question as input, and return a boolean (true if the specified character is escaped).

Readline will only call this proc with characters specified in .completer_quote_characters, to discover if they indicate the end of a quoted argument, or characters specified in .completer_word_break_characters, to discover if they indicate a break between arguments.

If .completer_quote_characters is not set, or if the user input doesn't contain one of the .completer_quote_characters or a ++ character, Readline will not attempt to use this proc at all.

Raises ArgumentError if proc does not respond to the call method.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 876

static VALUE
readline_s_set_quoting_detection_proc(VALUE self, VALUE proc)
{
    mustbe_callable(proc);
    return rb_ivar_set(mReadline, quoting_detection_proc, proc);
}

.special_prefixesString (rw)

Gets the list of characters that are word break characters, but should be left in text when it is passed to the completion function.

See GNU Readline's rl_special_prefixes variable.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1461

static VALUE
readline_s_get_special_prefixes(VALUE self)
{
    VALUE str;
    if (rl_special_prefixes == NULL) return Qnil;
    str = rb_ivar_get(mReadline, id_special_prefixes);
    if (!NIL_P(str)) {
        str = rb_str_dup_frozen(str);
        rb_obj_reveal(str, rb_cString);
    }
    return str;
}

.special_prefixes=(string) (rw)

Sets the list of characters that are word break characters, but should be left in text when it is passed to the completion function. Programs can use this to help determine what kind of completing to do. For instance, Bash sets this variable to “$@” so that it can complete shell variables and hostnames.

See GNU Readline's rl_special_prefixes variable.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1431

static VALUE
readline_s_set_special_prefixes(VALUE self, VALUE str)
{
    if (!NIL_P(str)) {
        OutputStringValue(str);
        str = rb_str_dup_frozen(str);
        rb_obj_hide(str);
    }
    rb_ivar_set(mReadline, id_special_prefixes, str);
    if (NIL_P(str)) {
        rl_special_prefixes = NULL;
    }
    else {
        rl_special_prefixes = RSTRING_PTR(str);
    }
    return self;
}

.vi_editing_modenil (readonly)

Specifies VI editing mode. See the manual of GNU Readline for details of VI editing mode.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1158

static VALUE
readline_s_vi_editing_mode(VALUE self)
{
    rl_vi_editing_mode(1,0);
    return Qnil;
}

.vi_editing_mode?Boolean (readonly)

Returns true if vi mode is active. Returns false if not.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1177

static VALUE
readline_s_vi_editing_mode_p(VALUE self)
{
    return rl_editing_mode == 0 ? Qtrue : Qfalse;
}

Class Method Details

.delete_text([start[, length]]) ⇒ self .delete_text(start..end) ⇒ self .delete_textself

Delete text between start and end in the current line.

See GNU Readline's rl_delete_text function.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 713

static VALUE
readline_s_delete_text(int argc, VALUE *argv, VALUE self)
{
    rb_check_arity(argc, 0, 2);
    if (rl_line_buffer) {
        const char *p, *ptr = rl_line_buffer;
        long beg = 0, len = strlen(ptr);
        const char *end = ptr + len;
        rb_encoding *enc = rb_locale_encoding();
        if (argc == 2) {
            beg = NUM2LONG(argv[0]);
            len = NUM2LONG(argv[1]);
          num_pos:
            p = str_subpos(ptr, end, beg, &len, enc);
            if (!p) rb_raise(rb_eArgError, "invalid index");
            beg = p - ptr;
        }
        else if (argc == 1) {
            len = rb_enc_strlen(ptr, ptr + len, enc);
            if (!rb_range_beg_len(argv[0], &beg, &len, len, 1)) {
                beg = NUM2LONG(argv[0]);
                goto num_pos;
            }
        }
        rl_delete_text(rb_long2int(beg), rb_long2int(beg + len));
    }
    return self;
}

.get_screen_sizeArray, columns

Returns the terminal's rows and columns.

See GNU Readline's rl_get_screen_size function.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1132

static VALUE
readline_s_get_screen_size(VALUE self)
{
    int rows, columns;
    VALUE res;

    rl_get_screen_size(&rows, &columns);
    res = rb_ary_new();
    rb_ary_push(res, INT2NUM(rows));
    rb_ary_push(res, INT2NUM(columns));
    return res;
}

.insert_text(string) ⇒ self

Insert text into the line at the current cursor position.

See GNU Readline's rl_insert_text function.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 679

static VALUE
readline_s_insert_text(VALUE self, VALUE str)
{
    OutputStringValue(str);
    rl_insert_text(RSTRING_PTR(str));
    return self;
}

.line_bufferString

Returns the full line that is being edited. This is useful from within the complete_proc for determining the context of the completion request.

The length of line_buffer and GNU Readline's rl_end are same.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 945

static VALUE
readline_s_get_line_buffer(VALUE self)
{
    if (rl_line_buffer == NULL)
        return Qnil;
    return rb_locale_str_new_cstr(rl_line_buffer);
}

.readline(prompt = "", add_hist = false) ⇒ String? (mod_func)

Shows the prompt and reads the inputted line with line editing. The inputted line is added to the history if add_hist is true.

Returns nil when the inputted line is empty and user inputs EOF (Presses ^D on UNIX).

Raises IOError exception if one of below conditions are satisfied.

  1. stdin was closed.

  2. stdout was closed.

This method supports thread. Switches the thread context when waits inputting line.

Supports line edit when inputs line. Provides VI and Emacs editing mode. Default is Emacs editing mode.

NOTE: Terminates ruby interpreter and does not return the terminal status after user pressed '^C' when wait inputting line. Give 3 examples that avoid it.

  • Catches the Interrupt exception by pressed ^C after returns terminal status:

    require "readline"
    
    stty_save = `stty -g`.chomp
    begin
      while buf = Readline.readline
          p buf
          end
        rescue Interrupt
          system("stty", stty_save)
          exit
        end
      end
    end
  • Catches the INT signal by pressed ^C after returns terminal status:

    require "readline"
    
    stty_save = `stty -g`.chomp
    trap("INT") { system "stty", stty_save; exit }
    
    while buf = Readline.readline
      p buf
    end
  • Ignores pressing ^C:

    require "readline"
    
    trap("INT", "SIG_IGN")
    
    while buf = Readline.readline
      p buf
    end

Can make as follows with ::HISTORY constant. It does not record to the history if the inputted line is empty or the same it as last one.

require "readline"

while buf = Readline.readline("> ", true)
  # p Readline::HISTORY.to_a
  Readline::HISTORY.pop if /^\s*$/ =~ buf

  begin
    if Readline::HISTORY[Readline::HISTORY.length-2] == buf
      Readline::HISTORY.pop
    end
  rescue IndexError
  end

  # p Readline::HISTORY.to_a
  print "-> ", buf, "\n"
end
[ GitHub ]

  
# File 'ext/readline/readline.c', line 485

static VALUE
readline_readline(int argc, VALUE *argv, VALUE self)
{
    VALUE tmp, add_hist, result;
    char *prompt = NULL;
    char *buff;
    int status;

    if (rb_scan_args(argc, argv, "02", &tmp, &add_hist) > 0) {
        OutputStringValue(tmp);
#if USE_INSERT_IGNORE_ESCAPE
        tmp = insert_ignore_escape(self, tmp);
        rb_str_locktmp(tmp);
#endif
        prompt = RSTRING_PTR(tmp);
    }

    prepare_readline();

#ifdef _WIN32
    rl_prep_terminal(1);
#endif
    buff = (char*)rb_protect(readline_get, (VALUE)prompt, &status);
#if USE_INSERT_IGNORE_ESCAPE
    if (prompt) {
        rb_str_unlocktmp(tmp);
    }
#endif
    if (status) {
#if defined HAVE_RL_CLEANUP_AFTER_SIGNAL
        /* restore terminal mode and signal handler*/
#if defined HAVE_RL_FREE_LINE_STATE
        rl_free_line_state();
#endif
        rl_cleanup_after_signal();
#elif defined HAVE_RL_DEPREP_TERM_FUNCTION
        /* restore terminal mode */
        if (rl_deprep_term_function != NULL) /* NULL in libedit. [ruby-dev:29116] */
            (*rl_deprep_term_function)();
        else
#else
        rl_deprep_terminal();
#endif
        rb_jump_tag(status);
    }

    if (RTEST(add_hist) && buff) {
        add_history(buff);
    }
    if (buff) {
        result = rb_locale_str_new_cstr(buff);
    }
    else
        result = Qnil;
    if (buff) free(buff);
    return result;
}

.redisplayself

Change what's displayed on the screen to reflect the current contents.

See GNU Readline's rl_redisplay function.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 757

static VALUE
readline_s_redisplay(VALUE self)
{
    rl_redisplay();
    return self;
}

.refresh_linenil

Clear the current input line.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1648

static VALUE
readline_s_refresh_line(VALUE self)
{
    prepare_readline();
    rl_refresh_line(0, 0);
    return Qnil;
}

.set_screen_size(rows, columns) ⇒ self

Set terminal size to rows and columns.

See GNU Readline's rl_set_screen_size function.

Raises NotImplementedError if the using readline library does not support.

[ GitHub ]

  
# File 'ext/readline/readline.c', line 1111

static VALUE
readline_s_set_screen_size(VALUE self, VALUE rows, VALUE columns)
{
    rl_set_screen_size(NUM2INT(rows), NUM2INT(columns));
    return self;
}