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##### http://autoconf-archive.cryp.to/vl_lib_readline.html
#
# SYNOPSIS
#
# VL_LIB_READLINE
#
# DESCRIPTION
#
# Searches for a readline compatible library. If found, defines
# `HAVE_LIBREADLINE'. If the found library has the `add_history'
# function, sets also `HAVE_READLINE_HISTORY'. Also checks for the
# locations of the necessary include files and sets `HAVE_READLINE_H'
# or `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
# 'HAVE_HISTORY_H' if the corresponding include files exists.
#
# The libraries that may be readline compatible are `libedit',
# `libeditline' and `libreadline'. Sometimes we need to link a
# termcap library for readline to work, this macro tests these cases
# too by trying to link with `libtermcap', `libcurses' or
# `libncurses' before giving up.
#
# Here is an example of how to use the information provided by this
# macro to perform the necessary includes or declarations in a C
# file:
#
# #ifdef HAVE_LIBREADLINE
# # if defined(HAVE_READLINE_READLINE_H)
# # include <readline/readline.h>
# # elif defined(HAVE_READLINE_H)
# # include <readline.h>
# # else /* !defined(HAVE_READLINE_H) */
# extern char *readline ();
# # endif /* !defined(HAVE_READLINE_H) */
# char *cmdline = NULL;
# #else /* !defined(HAVE_READLINE_READLINE_H) */
# /* no readline */
# #endif /* HAVE_LIBREADLINE */
#
# #ifdef HAVE_READLINE_HISTORY
# # if defined(HAVE_READLINE_HISTORY_H)
# # include <readline/history.h>
# # elif defined(HAVE_HISTORY_H)
# # include <history.h>
# # else /* !defined(HAVE_HISTORY_H) */
# extern void add_history ();
# extern int write_history ();
# extern int read_history ();
# # endif /* defined(HAVE_READLINE_HISTORY_H) */
# /* no history */
# #endif /* HAVE_READLINE_HISTORY */
#
# LAST MODIFICATION
#
# 2002-04-04
#
# COPYLEFT
#
# Copyright (c) 2002 Ville Laurikari <vl@iki.fi>
#
# Copying and distribution of this file, with or without
# modification, are permitted in any medium without royalty provided
# the copyright notice and this notice are preserved.
AC_DEFUN([VL_LIB_READLINE], [
AC_CACHE_CHECK([for a readline compatible library],
vl_cv_lib_readline, [
ORIG_LIBS="$LIBS"
for readline_lib in readline edit editline; do
for termcap_lib in "" termcap curses ncurses; do
if test -z "$termcap_lib"; then
TRY_LIB="-l$readline_lib"
else
TRY_LIB="-l$readline_lib -l$termcap_lib"
fi
LIBS="$ORIG_LIBS $TRY_LIB"
AC_TRY_LINK_FUNC(readline, vl_cv_lib_readline="$TRY_LIB")
if test -n "$vl_cv_lib_readline"; then
break
fi
done
if test -n "$vl_cv_lib_readline"; then
break
fi
done
if test -z "$vl_cv_lib_readline"; then
vl_cv_lib_readline="no"
LIBS="$ORIG_LIBS"
fi
])
if test "$vl_cv_lib_readline" != "no"; then
AC_DEFINE(HAVE_LIBREADLINE, 1,
[Define if you have a readline compatible library])
AC_CHECK_HEADERS(readline.h readline/readline.h)
AC_CACHE_CHECK([whether readline supports history],
vl_cv_lib_readline_history, [
vl_cv_lib_readline_history="no"
AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes")
])
if test "$vl_cv_lib_readline_history" = "yes"; then
AC_DEFINE(HAVE_READLINE_HISTORY, 1,
[Define if your readline library has \`add_history'])
AC_CHECK_HEADERS(history.h readline/history.h)
fi
fi
])dnl
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