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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_lib_readline.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_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 */
#
# LICENSE
#
# Copyright (c) 2008 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. This file is offered as-is, without any
# warranty.
#serial 6
AU_ALIAS([VL_LIB_READLINE], [AX_LIB_READLINE])
AC_DEFUN([AX_LIB_READLINE], [
AC_CACHE_CHECK([for a readline compatible library],
ax_cv_lib_readline, [
ORIG_LIBS="$LIBS"
for readline_lib in readline edit editline; do
# prefer ncurses since we use it for nmtui too
for termcap_lib in "" ncurses termcap curses; do
if test -z "$termcap_lib"; then
TRY_LIB="-l$readline_lib"
else
TRY_LIB="-l$readline_lib -l$termcap_lib"
fi
LIBS="$ORIG_LIBS $TRY_LIB"
AC_TRY_LINK_FUNC(readline, ax_cv_lib_readline="$TRY_LIB")
if test -n "$ax_cv_lib_readline"; then
break
fi
done
if test -n "$ax_cv_lib_readline"; then
break
fi
done
LIBS="$ORIG_LIBS"
])
if test -z "$ax_cv_lib_readline"; then
AC_MSG_ERROR([readline library with terminfo support is required (one of readline, edit, or editline, AND one of ncurses, curses, or termcap)])
fi
ORIG_LIBS="$LIBS"
LIBS="$LIBS $ax_cv_lib_readline"
AC_CHECK_HEADERS(readline.h readline/readline.h)
# Check history
AC_CACHE_CHECK([whether readline supports history],
ax_cv_lib_readline_history, [
ax_cv_lib_readline_history="no"
AC_TRY_LINK_FUNC(add_history, ax_cv_lib_readline_history="yes")
])
if test "$ax_cv_lib_readline_history" != "yes"; then
AC_MSG_ERROR(readline history support is required)
fi
AC_CHECK_HEADERS(history.h readline/history.h)
# check rl_echo_signal_char()
AC_CACHE_CHECK([whether readline supports rl_echo_signal_char()],
ax_cv_lib_readline_echo_signal_char, [
ax_cv_lib_readline_echo_signal_char="no"
AC_TRY_LINK_FUNC(rl_echo_signal_char, ax_cv_lib_readline_echo_signal_char="yes")
])
if test "$ax_cv_lib_readline_echo_signal_char" != "yes"; then
AC_MSG_ERROR(rl_echo_signal_char() is required (install readline6?))
fi
LIBS="$ORIG_LIBS"
READLINE_LIBS="$ax_cv_lib_readline"
AC_SUBST(READLINE_LIBS)
])dnl
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