Module: Readline

Defined in:
readline.c

Constant Summary collapse

HISTORY =

The history buffer. It extends Enumerable module, so it behaves just like an array. For example, gets the fifth content that the user input by HISTORY.

history
FILENAME_COMPLETION_PROC =

The Object with the call method that is a completion for filename. This is sets by Readline.completion_proc= method.

fcomp
USERNAME_COMPLETION_PROC =

The Object with the call method that is a completion for usernames. This is sets by Readline.completion_proc= method.

ucomp
VERSION =

Version string of GNU Readline or libedit.

version

Class Method Summary collapse

Class Method Details

.basic_quote_charactersString

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

Raises NotImplementedError if the using readline library does not support.

Returns:

  • (String)

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# File 'readline.c', line 1433

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) ⇒ Object

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

Raises NotImplementedError if the using readline library does not support.


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# File 'readline.c', line 1400

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

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.

Returns:

  • (String)

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# File 'readline.c', line 1263

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) ⇒ Object

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 'readline.c', line 1230

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

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.

Returns:

  • (String)

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# File 'readline.c', line 1489

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) ⇒ Object

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 Readline.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.


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# File 'readline.c', line 1456

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

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.

Returns:

  • (String)

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# File 'readline.c', line 1318

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) ⇒ Object

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

Raises NotImplementedError if the using readline library does not support.


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# File 'readline.c', line 1285

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

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.

Returns:

  • (String)

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# File 'readline.c', line 1204

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) ⇒ Object

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.


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# File 'readline.c', line 1174

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

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

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

require "readline"

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

Returns:

  • (Boolean)

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# File 'readline.c', line 864

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

.completion_case_fold=(bool) ⇒ Object

Sets whether or not to ignore case on completion.


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# File 'readline.c', line 844

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

.completion_procProc

Returns the completion Proc object.

Returns:

  • (Proc)

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# File 'readline.c', line 832

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

.completion_proc=(proc) ⇒ Object

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 Readline.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 Readline.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.


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# File 'readline.c', line 818

static VALUE
readline_s_set_completion_proc(VALUE self, VALUE proc)
{
    if (!NIL_P(proc) && !rb_respond_to(proc, rb_intern("call")))
        rb_raise(rb_eArgError, "argument must respond to `call'");
    return rb_ivar_set(mReadline, completion_proc, proc);
}

.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.

Overloads:

  • .delete_text([start[, length]]) ⇒ self

    Returns:

    • (self)
  • .delete_text(start..end) ⇒ self

    Returns:

    • (self)
  • .delete_textself

    Returns:

    • (self)

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# File 'readline.c', line 695

static VALUE
readline_s_delete_text(int argc, VALUE *argv, VALUE self)
{
    rb_check_arity(argc, 0, 2);
    if (rl_line_buffer) {
        char *p, *ptr = rl_line_buffer;
        long beg = 0, len = strlen(rl_line_buffer);
        struct RString fakestr;
        VALUE str = rb_setup_fake_str(&fakestr, ptr, len, rb_locale_encoding());
        OBJ_FREEZE(str);
        if (argc == 2) {
            beg = NUM2LONG(argv[0]);
            len = NUM2LONG(argv[1]);
          num_pos:
            p = rb_str_subpos(str, beg, &len);
            if (!p) rb_raise(rb_eArgError, "invalid index");
            beg = p - ptr;
        }
        else if (argc == 1) {
            len = rb_str_strlen(str);
            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;
}

.emacs_editing_modenil

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.

Returns:

  • (nil)

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# File 'readline.c', line 1109

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

.emacs_editing_mode?Boolean

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

Raises NotImplementedError if the using readline library does not support.

Returns:

  • (Boolean)

Returns:

  • (Boolean)

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# File 'readline.c', line 1128

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

.filename_quote_charactersString

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.

Returns:

  • (String)

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# File 'readline.c', line 1543

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) ⇒ Object

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.


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# File 'readline.c', line 1510

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;
}

.get_screen_sizeArray

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.

Returns:

  • (Array)

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# File 'readline.c', line 1045

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;
}

.input=(input) ⇒ Object

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


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# File 'readline.c', line 539

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);
            errno = save_errno;
            rb_sys_fail("fdopen");
        }
        rl_instream = readline_rl_instream = f;
        readline_instream = input;
    }
    return input;
}

.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.

Returns:

  • (self)

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# File 'readline.c', line 671

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 Readline.line_buffer and GNU Readline's rl_end are same.

Raises NotImplementedError if the using readline library does not support.

Returns:

  • (String)

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# File 'readline.c', line 884

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);
}

.output=(output) ⇒ Object

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


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# File 'readline.c', line 576

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);
            errno = save_errno;
            rb_sys_fail("fdopen");
        }
        rl_outstream = readline_rl_outstream = f;
        readline_outstream = output;
    }
    return output;
}

.pointInteger

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

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

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

Raises NotImplementedError if the using readline library does not support.

Returns:

  • (Integer)

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# File 'readline.c', line 911

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

.point=(int) ⇒ Object

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

Raises NotImplementedError if the using readline library does not support.

See Readline.point.


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# File 'readline.c', line 928

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

.pre_input_hookProc

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.

Returns:

  • (Proc)

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# File 'readline.c', line 639

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

.pre_input_hook=(proc) ⇒ Object

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.


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# File 'readline.c', line 621

static VALUE
readline_s_set_pre_input_hook(VALUE self, VALUE proc)
{
    if (!NIL_P(proc) && !rb_respond_to(proc, rb_intern("call")))
        rb_raise(rb_eArgError, "argument must respond to `call'");
    return rb_ivar_set(mReadline, id_pre_input_hook, proc);
}

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

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 Readline::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

Returns:

  • (String, nil)

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# File 'readline.c', line 474

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.

Returns:

  • (self)

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# File 'readline.c', line 740

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

.refresh_linenil

Clear the current input line.

Returns:

  • (nil)

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# File 'readline.c', line 1561

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.

Returns:

  • (self)

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# File 'readline.c', line 1024

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

.special_prefixesString

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.

Returns:

  • (String)

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# File 'readline.c', line 1374

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) ⇒ Object

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 “[email protected]” 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.


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# File 'readline.c', line 1344

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

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.

Returns:

  • (nil)

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# File 'readline.c', line 1071

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

.vi_editing_mode?Boolean

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

Raises NotImplementedError if the using readline library does not support.

Returns:

  • (Boolean)

Returns:

  • (Boolean)

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# File 'readline.c', line 1090

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