# ===========================================================================

# https://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 <[email protected]>

#

# 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 8

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

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_LINK_IFELSE([AC_LANG_CALL([], [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

if test -z "$ax_cv_lib_readline"; then

ax_cv_lib_readline="no"

fi

LIBS="$ORIG_LIBS"

])

if test "$ax_cv_lib_readline" != "no"; then

LIBS="$LIBS $ax_cv_lib_readline"

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],

ax_cv_lib_readline_history, [

ax_cv_lib_readline_history="no"

AC_LINK_IFELSE([AC_LANG_CALL([], [add_history])], [ax_cv_lib_readline_history="yes"])

])

if test "$ax_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