project (uirc3 C)
cmake_minimum_required (VERSION 2.8.11)

# Options
option (WANT_READLINE "Use GNU Readline for the UI (better)" ON)
option (WANT_LIBEDIT "Use BSD libedit for the UI" OFF)

# Moar warnings
if ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUC)
	# -Wunused-function is pretty annoying here, as everything is static
	set (CMAKE_C_FLAGS
		"${CMAKE_C_FLAGS} -std=c99 -Wall -Wextra -Wno-unused-function")
endif ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUC)

# Version
set (project_version "0.9.2")

# Try to append commit ID if it follows a version tag.  It might be nicer if
# we could also detect dirty worktrees but that's very hard to get right.
find_package (Git)
set (git_head "${PROJECT_SOURCE_DIR}/.git/HEAD")
if (GIT_FOUND AND EXISTS ${git_head})
	configure_file (${git_head} git-head.tag COPYONLY)
	execute_process (COMMAND ${GIT_EXECUTABLE} describe --tags --match v*
		WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
		RESULT_VARIABLE git_describe_result
		OUTPUT_VARIABLE git_describe OUTPUT_STRIP_TRAILING_WHITESPACE)
	if (NOT git_describe_result)
		string (REGEX REPLACE "^v" "" project_version "${git_describe}")
	endif (NOT git_describe_result)
endif (GIT_FOUND AND EXISTS ${git_head})

# Dashes make filenames confusing and upset packaging software
string (REPLACE "-" "+" project_version_safe "${project_version}")

# Dependencies
set (CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/liberty/cmake)
include (AddThreads)

find_package (Curses)
find_package (PkgConfig REQUIRED)
pkg_check_modules (dependencies REQUIRED libssl libcrypto libffi)
pkg_check_modules (ncursesw ncursesw)

if ("${CMAKE_SYSTEM_NAME}" MATCHES "BSD")
	include_directories (/usr/local/include)
	link_directories (/usr/local/lib)
	# Need this for SIGWINCH in FreeBSD and OpenBSD respectively;
	# our POSIX version macros make it undefined
	add_definitions (-D__BSD_VISIBLE=1 -D_BSD_SOURCE=1)
endif ("${CMAKE_SYSTEM_NAME}" MATCHES "BSD")

list (APPEND project_libraries ${dependencies_LIBRARIES})
include_directories (${dependencies_INCLUDE_DIRS})
link_directories (${dependencies_LIBRARY_DIRS})

# FIXME: other Lua versions may be acceptable, don't know yet
pkg_search_module (lua lua53 lua5.3 lua-5.3 lua>=5.3)
option (WITH_LUA "Enable experimental support for Lua plugins" ${lua_FOUND})

if (WITH_LUA)
	if (NOT lua_FOUND)
		message (FATAL_ERROR "Lua library not found")
	endif (NOT lua_FOUND)

	list (APPEND project_libraries ${lua_LIBRARIES})
	include_directories (${lua_INCLUDE_DIRS})
	link_directories (${lua_LIBRARY_DIRS})
endif (WITH_LUA)

# -lrt is only for glibc < 2.17
# -liconv may or may not be a part of libc
foreach (extra iconv rt)
	find_library (extra_lib_${extra} ${extra})
	if (extra_lib_${extra})
		list (APPEND project_libraries ${extra})
	endif (extra_lib_${extra})
endforeach (extra)

if (ncursesw_FOUND)
	list (APPEND project_libraries ${ncursesw_LIBRARIES})
	include_directories (${ncursesw_INCLUDE_DIRS})
elseif (CURSES_FOUND)
	list (APPEND project_libraries ${CURSES_LIBRARY})
	include_directories (${CURSES_INCLUDE_DIR})
else (CURSES_FOUND)
	message (SEND_ERROR "Curses not found")
endif (ncursesw_FOUND)

if ((WANT_READLINE AND WANT_LIBEDIT) OR (NOT WANT_READLINE AND NOT WANT_LIBEDIT))
	message (SEND_ERROR "You have to choose either GNU Readline or libedit")
elseif (WANT_READLINE)
	# OpenBSD's default readline is too old
	if ("${CMAKE_SYSTEM_NAME}" MATCHES "OpenBSD")
		include_directories (/usr/local/include/ereadline)
		list (APPEND project_libraries ereadline)
	else ("${CMAKE_SYSTEM_NAME}" MATCHES "OpenBSD")
		list (APPEND project_libraries readline)
	endif ("${CMAKE_SYSTEM_NAME}" MATCHES "OpenBSD")
elseif (WANT_LIBEDIT)
	pkg_check_modules (libedit REQUIRED libedit)
	list (APPEND project_libraries ${libedit_LIBRARIES})
	include_directories (${libedit_INCLUDE_DIRS})
endif ((WANT_READLINE AND WANT_LIBEDIT) OR (NOT WANT_READLINE AND NOT WANT_LIBEDIT))

# Generate a configuration file
set (HAVE_READLINE "${WANT_READLINE}")
set (HAVE_EDITLINE "${WANT_LIBEDIT}")
set (HAVE_LUA      "${WITH_LUA}")

include (GNUInstallDirs)
# ZyklonB is currently an odd duck but degesch follows normal XDG rules
set (zyklonb_plugin_dir ${CMAKE_INSTALL_LIBDIR}/zyklonb/plugins)
configure_file (${PROJECT_SOURCE_DIR}/config.h.in ${PROJECT_BINARY_DIR}/config.h)
include_directories (${PROJECT_SOURCE_DIR} ${PROJECT_BINARY_DIR})

# Project source files
set (common_sources)
set (common_headers ${PROJECT_BINARY_DIR}/config.h)

add_custom_command (OUTPUT kike-replies.c kike.msg
	COMMAND ${PROJECT_SOURCE_DIR}/kike-gen-replies.sh
		> kike-replies.c < ${PROJECT_SOURCE_DIR}/kike-replies
	DEPENDS ${PROJECT_SOURCE_DIR}/kike-replies
	COMMENT "Generating files from the list of server numerics")
set_source_files_properties (${PROJECT_BINARY_DIR}/kike-replies.c
	PROPERTIES HEADER_FILE_ONLY TRUE)

# Build
add_executable (zyklonb zyklonb.c ${common_sources} ${common_headers})
target_link_libraries (zyklonb ${project_libraries})
add_threads (zyklonb)

add_executable (degesch degesch.c kike-replies.c
	${common_sources} ${common_headers})
target_link_libraries (degesch ${project_libraries})
add_threads (degesch)

add_executable (kike kike.c kike-replies.c ${common_sources} ${common_headers})
target_link_libraries (kike ${project_libraries})
add_threads (kike)

# Tests
function (make_tests_for target_name)
	get_target_property (sources   ${target_name} SOURCES)
	get_target_property (libraries ${target_name} LINK_LIBRARIES)
	get_target_property (options   ${target_name} COMPILE_OPTIONS)

	set (test test-${target_name})
	add_executable (${test} ${sources})
	target_link_libraries (${test} ${libraries})
	set_target_properties (${test} PROPERTIES
		COMPILE_DEFINITIONS TESTING
		COMPILE_OPTIONS "${options}")

	add_test (NAME ${test} COMMAND ${test})
endfunction (make_tests_for)

include (CTest)
if (BUILD_TESTING)
	make_tests_for (degesch)
endif (BUILD_TESTING)

# Various clang-based diagnostics, loads of fake positives and spam
file (GLOB clang_tidy_sources *.c)
set (clang_tidy_checks misc-* readability-*
	-readability-braces-around-statements
	-readability-named-parameter)
string (REPLACE ";" "," clang_tidy_checks "${clang_tidy_checks}")

set (CMAKE_EXPORT_COMPILE_COMMANDS ON)
add_custom_target (clang-tidy
	COMMAND clang-tidy -p ${PROJECT_BINARY_DIR} -checks=${clang_tidy_checks}
		${clang_tidy_sources} 1>&2
	USES_TERMINAL
	WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})

# Installation
install (TARGETS zyklonb degesch kike DESTINATION ${CMAKE_INSTALL_BINDIR})
install (FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
install (DIRECTORY plugins/zyklonb/
	DESTINATION ${zyklonb_plugin_dir} USE_SOURCE_PERMISSIONS)
install (DIRECTORY plugins/degesch/
	DESTINATION ${CMAKE_INSTALL_DATADIR}/degesch/plugins)

# Generate documentation from program help
find_program (HELP2MAN_EXECUTABLE help2man)
if (NOT HELP2MAN_EXECUTABLE)
	message (FATAL_ERROR "help2man not found")
endif (NOT HELP2MAN_EXECUTABLE)

foreach (page zyklonb degesch kike)
	set (page_output "${PROJECT_BINARY_DIR}/${page}.1")
	list (APPEND project_MAN_PAGES "${page_output}")
	add_custom_command (OUTPUT ${page_output}
		COMMAND ${HELP2MAN_EXECUTABLE} -N
			"${PROJECT_BINARY_DIR}/${page}" -o ${page_output}
		DEPENDS ${page}
		COMMENT "Generating man page for ${page}" VERBATIM)
endforeach (page)

add_custom_target (docs ALL DEPENDS ${project_MAN_PAGES})

foreach (page ${project_MAN_PAGES})
	string (REGEX MATCH "\\.([0-9])" manpage_suffix "${page}")
	install (FILES "${page}"
		DESTINATION "${CMAKE_INSTALL_MANDIR}/man${CMAKE_MATCH_1}")
endforeach (page)

# CPack
set (CPACK_PACKAGE_DESCRIPTION_SUMMARY "Experimental IRC client, daemon and bot")
set (CPACK_PACKAGE_VERSION "${project_version_safe}")
set (CPACK_PACKAGE_VENDOR "Premysl Janouch")
set (CPACK_PACKAGE_CONTACT "Přemysl Janouch <p.janouch@gmail.com>")
set (CPACK_RESOURCE_FILE_LICENSE "${PROJECT_SOURCE_DIR}/LICENSE")

set (CPACK_GENERATOR "TGZ;ZIP")
set (CPACK_PACKAGE_FILE_NAME
	"${PROJECT_NAME}-${project_version_safe}-${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_PROCESSOR}")
set (CPACK_PACKAGE_INSTALL_DIRECTORY "${PROJECT_NAME}-${project_version_safe}")

set (CPACK_SOURCE_GENERATOR "TGZ;ZIP")
set (CPACK_SOURCE_IGNORE_FILES "/\\\\.git;/build;/CMakeLists.txt.user")
set (CPACK_SOURCE_PACKAGE_FILE_NAME "${PROJECT_NAME}-${project_version_safe}")

set (CPACK_SET_DESTDIR TRUE)
include (CPack)