If readline is installed, enable it.

CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 2.8)
 
-project(picrin)
+PROJECT(picrin)
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/")
 
 # git submodule update --init
 execute_process(

README.md

@@ -171,6 +171,7 @@ picrin scheme depends on some external libraries to build the binary:
 - getopt
 - readline (optional)
 
+Optional libraries are, if cmake detected them, automatically enabled.
 The compilation is tested only on Mac OSX and Ubuntu. I think (or hope) it'll be ok to compile and run on other operating systems such as Arch or Windows, but I don't guarantee :(
 
 ## Authors

cmake/FindReadline.cmake

@@ -0,0 +1,86 @@
+# This file was a part of LuaJit project.
+
+# ===============================================================================
+# LuaJIT -- a Just-In-Time Compiler for Lua. http://luajit.org/
+
+# Copyright (C) 2005-2013 Mike Pall. All rights reserved.
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+# [ MIT license: http://www.opensource.org/licenses/mit-license.php ]
+
+# ===============================================================================
+# [ LuaJIT includes code from Lua 5.1/5.2, which has this license statement: ]
+
+# Copyright (C) 1994-2012 Lua.org, PUC-Rio.
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+# ===============================================================================
+# [ LuaJIT includes code from dlmalloc, which has this license statement: ]
+
+# This is a version (aka dlmalloc) of malloc/free/realloc written by
+# Doug Lea and released to the public domain, as explained at
+# http://creativecommons.org/licenses/publicdomain
+
+# ===============================================================================
+
+
+
+# - Try to find Readline
+# Once done this will define
+#  READLINE_FOUND - System has readline
+#  READLINE_INCLUDE_DIRS - The readline include directories
+#  READLINE_LIBRARIES - The libraries needed to use readline
+#  READLINE_DEFINITIONS - Compiler switches required for using readline
+
+find_package ( PkgConfig )
+pkg_check_modules ( PC_READLINE QUIET readline )
+set ( READLINE_DEFINITIONS ${PC_READLINE_CFLAGS_OTHER} )
+
+find_path ( READLINE_INCLUDE_DIR readline/readline.h
+      HINTS ${PC_READLINE_INCLUDEDIR} ${PC_READLINE_INCLUDE_DIRS}
+      PATH_SUFFIXES readline )
+
+find_library ( READLINE_LIBRARY NAMES readline
+      HINTS ${PC_READLINE_LIBDIR} ${PC_READLINE_LIBRARY_DIRS} )
+
+set ( READLINE_LIBRARIES ${READLINE_LIBRARY} )
+set ( READLINE_INCLUDE_DIRS ${READLINE_INCLUDE_DIR} )
+
+include ( FindPackageHandleStandardArgs )
+# handle the QUIETLY and REQUIRED arguments and set READLINE_FOUND to TRUE
+# if all listed variables are TRUE
+find_package_handle_standard_args ( readline DEFAULT_MSG READLINE_LIBRARY READLINE_INCLUDE_DIR )

tools/CMakeLists.txt

@@ -1,3 +1,9 @@
+find_package(READLINE)
+if (READLINE_FOUND)
+  include_directories(${READLINE_INCLUDE_DIRS})
+  add_definitions(${READLINE_DEFINITIONS} -DPIC_ENABLE_READLINE=1)
+endif()
+
 add_executable(repl tools/main.c)
 set_target_properties(repl PROPERTIES OUTPUT_NAME picrin)
-target_link_libraries(repl picrin readline)
+target_link_libraries(repl picrin ${READLINE_LIBRARIES})