1. 人力
@emasaka
#tqrk02

2. 入力
@emasaka
#tqrk02

3. Introduce Myself
自己紹介

4. Occupation
職業

5. FREE
無職

6. Period
以上

7. Main Topic
本題

8. Termtter

9. Troubles happens
around “Input”
入力まわりはトラブルの巣

10. And
そして

11. We hopes to extend
“Input” by Ruby
入力をRubyで拡張したい

12. Example: Prompt the number of
characters
例：文字数をプロンプトに表示
※画面は合成です

13. Example: Auto Complete
例：自動補完
※画面は合成です

14. For that purpose
そのために

15. Extend readline by Ruby?
readlineをRubyで拡張？

16. Have to handle...
● C functions
● C variables
● C datas
Cの関数、Cの変数、Cのデータ
を扱わなくちゃならない

17. Port readline by Ruby?
readlineをRubyに移植？

18. Many codes
$ cat *.[ch] | wc ­l
28955
大量のコード

19. Many global variables
$ ruby ­ne 'next if /#|f|./;
print gsub(/x7f.*/, "")' TAGS |
wc ­l
1017
大量のグローバル変数、
static変数

20. Local static variables
$ grep '^ *static' *.c | wc ­l
39
ローカルのstatic変数も

21. Strange code
int
rl_bind_key_in_map (key, function, map)
int key;
rl_command_func_t *function;
Keymap map;
{
int result;
Keymap oldmap;
oldmap = _rl_keymap;
_rl_keymap = map;
result = rl_bind_key (key, function);
_rl_keymap = oldmap;
return (result);
}
へんなコード

22. int
rl_bind_key_in_map (key, function, map)
int key;
rl_command_func_t *function;
Keymap map;
{
int result;
Keymap oldmap;
Differs one
argument
oldmap = _rl_keymap;
_rl_keymap = map;
result = rl_bind_key (key, function);
_rl_keymap = oldmap;
return (result);
}
引数1個が違う関数

23. ① save global variable
int
rl_bind_key_in_map (key, function, map)
int key;
rl_command_func_t *function;
Keymap map;
{
int result;
Keymap oldmap;
oldmap = _rl_keymap;
_rl_keymap = map;
result = rl_bind_key (key, function);
_rl_keymap = oldmap;
return (result);
}
グローバル変数を保存

24. ② set argument to global variable
int
rl_bind_key_in_map (key, function, map)
int key;
rl_command_func_t *function;
Keymap map;
{
int result;
Keymap oldmap;
oldmap = _rl_keymap;
_rl_keymap = map;
result = rl_bind_key (key, function);
_rl_keymap = oldmap;
return (result);
}
引数をグローバル変数にセット

25. ③ call function
int
rl_bind_key_in_map (key, function, map)
int key;
rl_command_func_t *function;
Keymap map;
{
int result;
Keymap oldmap;
oldmap = _rl_keymap;
_rl_keymap = map;
result = rl_bind_key (key, function);
_rl_keymap = oldmap;
return (result);
}
関数呼び出し

26. ④ restore global variable
int
rl_bind_key_in_map (key, function, map)
int key;
rl_command_func_t *function;
Keymap map;
{
int result;
Keymap oldmap;
oldmap = _rl_keymap;
_rl_keymap = map;
result = rl_bind_key (key, function);
_rl_keymap = oldmap;
return (result);
}
グローバル変数を復旧

27. ( ﾟдﾟ)

28. Make readline-like library
by Ruby?
readlineモドキをRubyで
新しく作る？

29. ReadRhine
http://github.com/emasaka/ReadRhine

30. Works only on Ruby 1.9
(for character handling)
Ruby 1.9系専用
（文字の扱いが違うので）

31. Requires (from gem)
● ruby-termios
● ruby-terminfo

32. ● “xterm” in terminfo
(I found it this morning)
terminfoで“xterm”
(今朝気付いた)

33. How to use
使い方

34. OOP interface
require 'readrhine'
rr = ReadRhine.new(prompt: '> ')
text = rr.readline
OOPインターフェイス

35. readline compatible interface
require 'readrhine/rlcompat'
text = ReadRhine.readline('> ')
readline互換インターフェイス

36. Structure
構造

37. MVC
Models Views
Display
Buffer
Keymap
History Controls
Undo Command
Completion

38. Models don't depend on
Views and Controls
ModelはViewやControlに
依存していない

39. Main loop
read
while true
seq = read_key_seq(@keymap)
dispatch(seq, @keymap) eval
@display.redisplay
end print
メインループ

40. unit test friendly
ユニットテストしやすい

41. Spec of Buffer
it "should contains inserted string at top" do
ins_str1 = 'xyz'
ins_str2 = '123'
@buffer.insert(ins_str1)
@buffer.point = 0
@buffer.insert(ins_str2)
@buffer.to_s.should == ins_str2 + ins_str1
end
BufferのSpec

42. Spec of Completion
describe ReadRhine::Completion, "when given completion_proc"
do
before do
@list1 = %w[foobar foobaz foohoge]
@buffer = ReadRhine::Buffer.new
@completion = ReadRhine::Completion.new(@buffer)
@completion.completion_proc = ­>(_){@list1}
end
it "should get common string" do
@completion.attempted_completion('').should == 'foo'
end
end
CompletionのSpec

43. Internal DSL
内部DSL

44. Key definition
@keymap = Keymap.new
@keymap["C­f"] = :forward_char
@keymap["C­xC­u"] = :undo
キーの定義

45. Available commands
いまあるコマンド

46. Cursor movement
@@default_keymap["C­a"] = :beginning_of_line
@@default_keymap["C­b"] = :backward_char
@@default_keymap["C­e"] = :end_of_line
@@default_keymap["C­f"] = :forward_char
@@default_keymap["e[D"] = :backward_char
@@default_keymap["e[C"] = :forward_char
@@default_keymap["eOH"] = :beginning_of_line
@@default_keymap["eOF"] = :end_of_line
カーソル移動

47. Finishing
@@default_keymap["C­j"] = :done
@@default_keymap["C­m"] = :done
入力終了

48. Deleting
@@default_keymap["C­d"] = :delete_char
@@default_keymap["C­h"] = :backward_delete_char
@@default_keymap["C­k"] = :kill_line
@@default_keymap["C­u"] = :unix_line_discard
@@default_keymap["x7f"] = :backward_delete_char
削除

49. undo
@@default_keymap["C­_"] = :undo
@@default_keymap["C­xC­u"] = :undo
アンドゥ

50. Completion
@@default_keymap["C­i"] = :complete
@@default_keymap["C­i"] = :menu_complete
補完

51. History
@@default_keymap["C­n"] = :next_history
@@default_keymap["C­p"] = :previous_history
@@default_keymap["e[A"] = :previous_history
@@default_keymap["e[B"] = :next_history
履歴

52. TODOs
やんなくちゃならないこと

53. ● Safe signal handling
● More about completion
● History search
● Per-word cursor movement
● Digit argument
● ...

54. Most confusing is ...
いちばんややこしいのは…

55. character width
文字幅

56. Width of “☆” is ...
“☆”の幅は…

57. Only terminal knows
そのターミナルだけが
知っている

58. Messy
めんどくさい

59. DEMO
デモ