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   1 #
   2 # SYNOPSIS
   3 #
   4 #   PANDORA_HAVE_LIBREADLINE
   5 #
   6 # DESCRIPTION
   7 #
   8 #   Searches for a readline compatible library. If found, defines
   9 #   `HAVE_LIBREADLINE'. If the found library has the `add_history'
  10 #   function, sets also `HAVE_READLINE_HISTORY'. Also checks for the
  11 #   locations of the necessary include files and sets `HAVE_READLINE_H'
  12 #   or `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
  13 #   'HAVE_HISTORY_H' if the corresponding include files exists.
  14 #
  15 #   The libraries that may be readline compatible are `libedit',
  16 #   `libeditline' and `libreadline'. Sometimes we need to link a
  17 #   termcap library for readline to work, this macro tests these cases
  18 #   too by trying to link with `libtermcap', `libcurses' or
  19 #   `libncurses' before giving up.
  20 #
  21 #   Here is an example of how to use the information provided by this
  22 #   macro to perform the necessary includes or declarations in a C
  23 #   file:
  24 #
  25 #     #ifdef HAVE_LIBREADLINE
  26 #     #  if defined(HAVE_READLINE_READLINE_H)
  27 #     #    include <readline/readline.h>
  28 #     #  elif defined(HAVE_READLINE_H)
  29 #     #    include <readline.h>
  30 #     #  else /* !defined(HAVE_READLINE_H) */
  31 #     extern char *readline ();
  32 #     #  endif /* !defined(HAVE_READLINE_H) */
  33 #     char *cmdline = NULL;
  34 #     #else /* !defined(HAVE_READLINE_READLINE_H) */
  35 #       /* no readline */
  36 #     #endif /* HAVE_LIBREADLINE */
  37 #
  38 #     #ifdef HAVE_READLINE_HISTORY
  39 #     #  if defined(HAVE_READLINE_HISTORY_H)
  40 #     #    include <readline/history.h>
  41 #     #  elif defined(HAVE_HISTORY_H)
  42 #     #    include <history.h>
  43 #     #  else /* !defined(HAVE_HISTORY_H) */
  44 #     extern void add_history ();
  45 #     extern int write_history ();
  46 #     extern int read_history ();
  47 #     #  endif /* defined(HAVE_READLINE_HISTORY_H) */
  48 #       /* no history */
  49 #     #endif /* HAVE_READLINE_HISTORY */
  50 #
  51 # LAST MODIFICATION
  52 #
  53 #   2009-11-17
  54 #
  55 # Based on VL_LIB_READLINE from  Ville Laurikari
  56 #
  57 # COPYLEFT
  58 #
  59 #   Copyright (c) 2009 Monty Taylor
  60 #   Copyright (c) 2002 Ville Laurikari <vl@iki.fi>
  61 #
  62 #   Copying and distribution of this file, with or without
  63 #   modification, are permitted in any medium without royalty provided
  64 #   the copyright notice and this notice are preserved.
  65
  66 AC_DEFUN([PANDORA_CHECK_TIOCGWINSZ],[
  67   AC_CACHE_CHECK([for TIOCGWINSZ in sys/ioctl.h],
  68     [pandora_cv_tiocgwinsz_in_ioctl],[
  69     AC_COMPILE_IFELSE([
  70       AC_LANG_PROGRAM([[
  71 #include <sys/types.h>
  72 #include <sys/ioctl.h>
  73       ]],[[
  74 int x= TIOCGWINSZ;
  75       ]])
  76     ],[
  77       pandora_cv_tiocgwinsz_in_ioctl=yes
  78     ],[
  79       pandora_cv_tiocgwinsz_in_ioctl=no
  80     ])
  81   ])
  82   AS_IF([test "$pandora_cv_tiocgwinsz_in_ioctl" = "yes"],[
  83     AC_DEFINE([GWINSZ_IN_SYS_IOCTL], [1],
  84               [READLINE: your system defines TIOCGWINSZ in sys/ioctl.h.])
  85   ])
  86 ])
  87
  88 AC_DEFUN([PANDORA_CHECK_RL_COMPENTRY], [
  89   AC_CACHE_CHECK([defined rl_compentry_func_t], [pandora_cv_rl_compentry],[
  90     AC_COMPILE_IFELSE([
  91       AC_LANG_PROGRAM([[
  92 #include "stdio.h"
  93 #include "readline/readline.h"
  94       ]],[[
  95 rl_compentry_func_t *func2= (rl_compentry_func_t*)0;
  96       ]])
  97     ],[
  98       pandora_cv_rl_compentry=yes
  99     ],[
 100       pandora_cv_rl_compentry=no
 101     ])
 102   ])
 103   AS_IF([test "$pandora_cv_rl_compentry" = "yes"],[
 104     AC_DEFINE([HAVE_RL_COMPENTRY], [1],
 105               [Does system provide rl_compentry_func_t])
 106   ])
 107
 108   save_CXXFLAGS="${CXXFLAGS}"
 109   CXXFLAGS="${AM_CXXFLAGS} ${CXXFLAGS}"
 110   AC_LANG_PUSH(C++)
 111   AC_CACHE_CHECK([rl_compentry_func_t works], [pandora_cv_rl_compentry_works],[
 112     AC_COMPILE_IFELSE([
 113       AC_LANG_PROGRAM([[
 114 #include "stdio.h"
 115 #include "readline/readline.h"
 116       ]],[[
 117 rl_completion_entry_function= (rl_compentry_func_t*)NULL;
 118       ]])
 119     ],[
 120       pandora_cv_rl_compentry_works=yes
 121     ],[
 122       pandora_cv_rl_compentry_works=no
 123     ])
 124   ])
 125   AS_IF([test "$pandora_cv_rl_compentry_works" = "yes"],[
 126     AC_DEFINE([HAVE_WORKING_RL_COMPENTRY], [1],
 127               [Does system provide an rl_compentry_func_t that is usable])
 128   ])
 129   CXXFLAGS="${save_CXXFLAGS}"
 130   AC_LANG_POP()
 131 ])
 132
 133
 134 AC_DEFUN([PANDORA_CHECK_RL_COMPLETION_FUNC], [
 135   AC_CACHE_CHECK([defined rl_completion_func_t], [pandora_cv_rl_completion],[
 136     AC_COMPILE_IFELSE([
 137       AC_LANG_PROGRAM([[
 138 #include "stdio.h"
 139 #include "readline/readline.h"
 140       ]],[[
 141 rl_completion_func_t *func1= (rl_completion_func_t*)0;
 142       ]])
 143     ],[
 144       pandora_cv_rl_completion=yes
 145     ],[
 146       pandora_cv_rl_completion=no
 147     ])
 148   ])
 149   AS_IF([test "$pandora_cv_rl_completion" = "yes"],[
 150     AC_DEFINE([HAVE_RL_COMPLETION], [1],
 151               [Does system provide rl_completion_func_t])
 152   ])
 153 ])
 154
 155 AC_DEFUN([_PANDORA_SEARCH_LIBREADLINE], [
 156
 157   save_LIBS="${LIBS}"
 158   LIBS=""
 159
 160   AC_CACHE_CHECK([for a readline compatible library],
 161                  ac_cv_libreadline, [
 162     ORIG_LIBS="$LIBS"
 163     for readline_lib in readline edit editline; do
 164       for termcap_lib in "" termcap curses ncurses; do
 165         if test -z "$termcap_lib"; then
 166           TRY_LIB="-l$readline_lib"
 167         else
 168           TRY_LIB="-l$readline_lib -l$termcap_lib"
 169         fi
 170         LIBS="$ORIG_LIBS $TRY_LIB"
 171         AC_TRY_LINK_FUNC(readline, ac_cv_libreadline="$TRY_LIB")
 172         if test -n "$ac_cv_libreadline"; then
 173           break
 174         fi
 175       done
 176       if test -n "$ac_cv_libreadline"; then
 177         break
 178       fi
 179     done
 180     if test -z "$ac_cv_libreadline"; then
 181       ac_cv_libreadline="no"
 182       LIBS="$ORIG_LIBS"
 183     fi
 184   ])
 185
 186   if test "$ac_cv_libreadline" != "no"; then
 187     AC_DEFINE(HAVE_LIBREADLINE, 1,
 188               [Define if you have a readline compatible library])
 189     AC_CHECK_HEADERS(readline.h readline/readline.h)
 190     AC_CACHE_CHECK([whether readline supports history],
 191                    ac_cv_libreadline_history, [
 192       ac_cv_libreadline_history="no"
 193       AC_TRY_LINK_FUNC(add_history, ac_cv_libreadline_history="yes")
 194     ])
 195     if test "$ac_cv_libreadline_history" = "yes"; then
 196       AC_DEFINE(HAVE_READLINE_HISTORY, 1,
 197                 [Define if your readline library has \`add_history'])
 198       AC_CHECK_HEADERS(history.h readline/history.h)
 199     fi
 200   fi
 201   PANDORA_CHECK_RL_COMPENTRY
 202   PANDORA_CHECK_RL_COMPLETION_FUNC
 203   PANDORA_CHECK_TIOCGWINSZ
 204
 205
 206   READLINE_LIBS="${LIBS}"
 207   LIBS="${save_LIBS}"
 208   AC_SUBST(READLINE_LIBS)
 209
 210   AM_CONDITIONAL(HAVE_LIBREADLINE, [test "x${ac_cv_libreadline}" = "xyes"])
 211 ])
 212
 213 AC_DEFUN([_PANDORA_HAVE_LIBREADLINE],[
 214
 215   AC_ARG_ENABLE([libreadline],
 216     [AS_HELP_STRING([--disable-libreadline],
 217       [Build with libreadline support @<:@default=on@:>@])],
 218     [ac_enable_libreadline="$enableval"],
 219     [ac_enable_libreadline="yes"])
 220
 221   _PANDORA_SEARCH_LIBREADLINE
 222 ])
 223
 224
 225 AC_DEFUN([PANDORA_HAVE_LIBREADLINE],[
 226   AC_REQUIRE([_PANDORA_HAVE_LIBREADLINE])
 227 ])
 228
 229 AC_DEFUN([_PANDORA_REQUIRE_LIBREADLINE],[
 230   ac_enable_libreadline="yes"
 231   _PANDORA_SEARCH_LIBREADLINE
 232
 233   AS_IF([test "x$ac_cv_libreadline" = "xno"],
 234     AC_MSG_ERROR([libreadline is required for ${PACKAGE}. On Debian this can be found in libreadline5-dev. On RedHat this can be found in readline-devel.]))
 235
 236 ])
 237
 238 AC_DEFUN([PANDORA_REQUIRE_LIBREADLINE],[
 239   AC_REQUIRE([_PANDORA_REQUIRE_LIBREADLINE])
 240 ])
 241
 242