libguile/readline.c

   1 /* readline.c --- line editing support for Guile */
   2
   3 /*      Copyright (C) 1997 Free Software Foundation, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software; see the file COPYING.  If not, write to
  17  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  * As a special exception, the Free Software Foundation gives permission
  20  * for additional uses of the text contained in its release of GUILE.
  21  *
  22  * The exception is that, if you link the GUILE library with other files
  23  * to produce an executable, this does not by itself cause the
  24  * resulting executable to be covered by the GNU General Public License.
  25  * Your use of that executable is in no way restricted on account of
  26  * linking the GUILE library code into it.
  27  *
  28  * This exception does not however invalidate any other reasons why
  29  * the executable file might be covered by the GNU General Public License.
  30  *
  31  * This exception applies only to the code released by the
  32  * Free Software Foundation under the name GUILE.  If you copy
  33  * code from other Free Software Foundation releases into a copy of
  34  * GUILE, as the General Public License permits, the exception does
  35  * not apply to the code that you add in this way.  To avoid misleading
  36  * anyone as to the status of such modified files, you must delete
  37  * this exception notice from them.
  38  *
  39  * If you write modifications of your own for GUILE, it is your choice
  40  * whether to permit this exception to apply to your modifications.
  41  * If you do not wish that, delete this exception notice.
  42  */
  43 \f
  44
  45 #include "_scm.h"
  46 #ifdef HAVE_LIBREADLINE
  47 #include <libguile.h>
  48 #include <readline.h>
  49 #include <gh.h>
  50 #include <readline/readline.h>
  51 #include <readline/history.h>
  52
  53 SCM_PROC (s_readline, "readline", 0, 1, 0, scm_readline);
  54 SCM
  55 scm_readline (SCM txt)
  56 {
  57   SCM ret;
  58   char* s;
  59   char* prompt;
  60
  61   if (! SCM_UNBNDP (txt))
  62     {
  63       SCM_ASSERT ((SCM_NIMP(txt) && SCM_STRINGP(txt)), txt, SCM_ARG1,
  64                   s_readline);
  65       SCM_COERCE_SUBSTR (txt);
  66     }
  67
  68   SCM_DEFER_INTS;
  69   prompt = SCM_UNBNDP (txt) ? "" : SCM_CHARS (txt);
  70
  71   s = readline(prompt);
  72   if (s)
  73     ret = gh_str02scm(s);
  74   else
  75     ret = SCM_EOF_VAL;
  76
  77   free (s);
  78   SCM_ALLOW_INTS;
  79
  80   return ret;
  81 }
  82
  83 SCM_PROC (s_add_history, "add-history", 1, 0, 0, scm_add_history);
  84 SCM
  85 scm_add_history (SCM txt)
  86 {
  87   char* s;
  88   SCM_ASSERT ((SCM_NIMP(txt) && SCM_STRINGP(txt)), txt, SCM_ARG1,
  89               s_add_history);
  90   SCM_COERCE_SUBSTR (txt);
  91
  92   SCM_DEFER_INTS;
  93   s = SCM_CHARS(txt);
  94   add_history(s);
  95   SCM_ALLOW_INTS;
  96
  97   return SCM_UNSPECIFIED;
  98 }
  99
 100 void
 101 scm_init_readline ()
 102 {
 103 #include "readline.x"
 104   scm_add_feature ("readline");
 105 }
 106
 107 #endif