LISPUSER

これは、パイプのストリームを開く個所で EXTERNAL-FORMAT を指定することで実現できます。 CLISP の場合は、 SYS::*DEFAULT-FILE-ENCODING* の値に従ったエンコーディングとなります。

 (system::set-default-file-encoding charset:utf-8)

ここは処理系毎に違いますので、お使いの処理系のマニュアルを参照してください。

Tcl/Tk のストリームエンコーディング指定 fconfigure を使います。

 (setf ltk:*init-wish-hook* (list
                              (lambda ()
                                (ltk:send-wish "fconfigure stdout -encoding utf-8")
                                (ltk:send-wish "fconfigure stdin -encoding utf-8"))))

初期化処理のなかで、エンコーディングの設定を行います。

LTK にパッチをあててください。

*** ltk.lisp.orig      2008-08-11 20:55:43.000000000 +0900
--- ltk.lisp   2008-08-11 20:55:51.000000000 +0900
***************
*** 137,142 ****
--- 137,143 ----
             #:wish-stream
             #:*wish-args*
             #:*wish-pathname*
+            #:*default-file-encoding*
             #:*default-ltk-debugger*
             #:add-pane
             #:add-separator
***************
*** 464,469 ****
--- 465,472 ----
  
  (defvar *wish-args* '("-name" "LTK"))
  
+ (defvar *default-file-encoding* "utf-8")
+ 
  (defvar *init-wish-hook* nil)
  
  (defun dbg (fmt &rest args)
***************
*** 2304,2321 ****
    (format-wish "~A delete 0.0 end;~A insert end {~A}" (widget-path text) (widget-path text) val)
    val)
  
! (defgeneric save-text (txt filename))
! (defmethod save-text ((txt text) filename)
    "save the content of the text widget into the file <filename>"
!   (format-wish "set file [open {~a} \"w\"];puts $file [~a get 1.0 end];close $file;puts \"asdf\"" filename (widget-path txt))
    (read-line (wish-stream *wish*))
    txt)
  
! (defgeneric load-text (txt filename))
! (defmethod load-text((txt text) filename)
    "load the content of the file <filename>"
  ;  (format-wish "set file [open {~a} \"r\"];~a delete 1.0 end;~a insert end [read $file];close $file;puts \"asdf\"" filename (widget-path txt) (widget-path txt))
!   (format-wish "set file [open {~a} \"r\"];~a delete 1.0 end;~a insert end [read $file];close $file;puts \"(:DATA asdf)\"" filename (widget-path txt) (widget-path txt))
    (read-data))
  
  ;;; photo image object
--- 2307,2324 ----
    (format-wish "~A delete 0.0 end;~A insert end {~A}" (widget-path text) (widget-path text) val)
    val)
  
! (defgeneric save-text (txt filename &optional encoding))
! (defmethod save-text ((txt text) filename &optional (encoding *default-file-encoding*))
    "save the content of the text widget into the file <filename>"
!   (format-wish "set file [open {~a} \"w\"];fconfigure $file -encoding ~A;puts $file [~a get 1.0 end];close $file;puts \"asdf\"" filename encoding (widget-path txt))
    (read-line (wish-stream *wish*))
    txt)
  
! (defgeneric load-text (txt filename &optional encoding))
! (defmethod load-text ((txt text) filename &optional (encoding *default-file-encoding*))
    "load the content of the file <filename>"
  ;  (format-wish "set file [open {~a} \"r\"];~a delete 1.0 end;~a insert end [read $file];close $file;puts \"asdf\"" filename (widget-path txt) (widget-path txt))
!   (format-wish "set file [open {~a} \"r\"];fconfigure $file -encoding ~A;~a delete 1.0 end;~a insert end [read $file];close $file;puts \"(:DATA asdf)\"" filename encoding (widget-path txt) (widget-path txt))
    (read-data))
  
  ;;; photo image object

これで、 LTK からのファイル入出力が LTK::*default-file-encoding* で指定したエンコーディングになります。