[ruby-trunk - Bug #6456][Open] [readline] Readline.point when history edited

Gurdipe_D · May 19, 2012, 4:23am

Issue #6456 has been reported by no6v (Nobuhiro IMAI).

Bug #6456: [readline] Readline.point when history edited

Author: no6v (Nobuhiro IMAI)
Status: Open
Priority: Normal
Assignee:
Category: ext
Target version:
ruby -v: ruby 2.0.0dev (2012-05-19 trunk 35705) [x86_64-linux]

=begin
以下のように、履歴をたどって編集した時に Readline.point の値がおかしくなるようです。

require “readline”

RUBY_DESCRIPTION # => “ruby 2.0.0dev (2012-05-19 trunk 35705)
[x86_64-linux]”
Readline::VERSION # => “6.2”

IO.pipe do |r, w|
Readline.input = r
w << “123\n\cP456\n\cP\n”
Readline.readline(“”, true) # => “123”
Readline.point # => 3
Readline.readline(“”, true) # => “123456”
Readline.point # => 3
Readline.readline(“”, true) # => “123456”
Readline.point # => 6
end

>> 123

>> 123456

=end

no6v_SNobuhiro_IMAI · May 21, 2012, 12:25pm

Issue #6456 has been updated by mame (Yusuke E.).

Status changed from Open to Assigned
Assignee set to kouji (Kouji T.)

Bug #6456: [readline] Readline.point when history edited

Author: no6v (Nobuhiro IMAI)
Status: Assigned
Priority: Normal
Assignee: kouji (Kouji T.)
Category: ext
Target version:
ruby -v: ruby 2.0.0dev (2012-05-19 trunk 35705) [x86_64-linux]

=begin
以下のように、履歴をたどって編集した時に Readline.point の値がおかしくなるようです。

require “readline”

RUBY_DESCRIPTION # => “ruby 2.0.0dev (2012-05-19 trunk 35705)
[x86_64-linux]”
Readline::VERSION # => “6.2”

IO.pipe do |r, w|
Readline.input = r
w << “123\n\cP456\n\cP\n”
Readline.readline(“”, true) # => “123”
Readline.point # => 3
Readline.readline(“”, true) # => “123456”
Readline.point # => 3
Readline.readline(“”, true) # => “123456”
Readline.point # => 6
end

>> 123

>> 123456

=end

no6v_SNobuhiro_IMAI · April 6, 2013, 4:12pm

Issue #6456 has been updated by Glass_saga (Masaki M.).

Status changed from Assigned to Third Party’s Issue

Readline.pointの実体はGNU readlineの変数rl_pointですが、次のようなコードで検証したところ

#include <stdlib.h>
#include <stdio.h>
#include <readline/readline.h>
#include <readline/history.h>

int
main() {
const char *prompt = "> ";
char *line = NULL;

while (line = readline(prompt)) {
    add_history(line);
    printf("%d: \"%s\"\n", rl_point, line);
    free(line);
}

clear_history();

return EXIT_SUCCESS;

}

% ./a.out

hoge
4: “hoge”
hogefuga # 履歴から"hoge"を復元し"fuga"を追記
4: “hogefuga”
hogefuga # 履歴から"hogefuga"を復元
8: “hogefuga”

以上のような挙動を示したので、GNU readline側の仕様ないしバグではないかと思われます。

Bug #6456: [readline] Readline.point when history edited

Author: no6v (Nobuhiro IMAI)
Status: Third Party’s Issue
Priority: Normal
Assignee: kouji (Kouji T.)
Category: ext
Target version:
ruby -v: ruby 2.0.0dev (2012-05-19 trunk 35705) [x86_64-linux]

=begin
以下のように、履歴をたどって編集した時に Readline.point の値がおかしくなるようです。

require “readline”

RUBY_DESCRIPTION # => “ruby 2.0.0dev (2012-05-19 trunk 35705)
[x86_64-linux]”
Readline::VERSION # => “6.2”

IO.pipe do |r, w|
Readline.input = r
w << “123\n\cP456\n\cP\n”
Readline.readline(“”, true) # => “123”
Readline.point # => 3
Readline.readline(“”, true) # => “123456”
Readline.point # => 3
Readline.readline(“”, true) # => “123456”
Readline.point # => 6
end

>> 123

>> 123456

=end