cmake_minimum_required (VERSION 3.0)
project (uirc3 VERSION 1.4.0 LANGUAGES C)

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

# Version
set (project_version "${PROJECT_VERSION}")

# 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.
# If we didn't need this for CPack, we could use add_custom_command to generate
# a version source/include file.
find_package (Git)
set (git_head "${PROJECT_SOURCE_DIR}/.git/HEAD")
if (GIT_FOUND AND EXISTS "${git_head}")
	configure_file ("${git_head}" git-head.tag COPYONLY)
	file (READ "${git_head}" git_head_content)
	if (git_head_content MATCHES "^ref: ([^\r\n]+)")
		set (git_ref "${PROJECT_SOURCE_DIR}/.git/${CMAKE_MATCH_1}")
		if (EXISTS "${git_ref}")
			configure_file ("${git_ref}" git-ref.tag COPYONLY)
		endif ()
	endif ()

	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 ()
endif ()

# 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 (PkgConfig REQUIRED)
pkg_check_modules (libssl REQUIRED libssl libcrypto)
list (APPEND project_libraries ${libssl_LIBRARIES})
include_directories (${libssl_INCLUDE_DIRS})
link_directories (${libssl_LIBRARY_DIRS})

if ("${CMAKE_SYSTEM_NAME}" MATCHES "BSD")
	# 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 ()

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

include (CheckCSourceRuns)
set (CMAKE_REQUIRED_LIBRARIES ${project_libraries})
get_property (CMAKE_REQUIRED_INCLUDES
	DIRECTORY "${PROJECT_SOURCE_DIR}" PROPERTY INCLUDE_DIRECTORIES)
CHECK_C_SOURCE_RUNS ("#include <iconv.h>
	int main () { return iconv_open (\"UTF-8//TRANSLIT\", \"ISO-8859-1\")
		== (iconv_t) -1; }" ICONV_ACCEPTS_TRANSLIT)

# Dependencies for xC
pkg_check_modules (libffi REQUIRED libffi)
list (APPEND xC_libraries ${libffi_LIBRARIES})
include_directories (${libffi_INCLUDE_DIRS})
link_directories (${libffi_LIBRARY_DIRS})

# XXX: other Lua versions may be acceptable, don't know yet
pkg_search_module (lua lua53 lua5.3 lua-5.3 lua54 lua5.4 lua-5.4 lua>=5.3)
option (WITH_LUA "Enable support for Lua plugins" ${lua_FOUND})

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

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

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

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 ("${CMAKE_SYSTEM_NAME}" MATCHES "OpenBSD")
		include_directories (${OPENBSD_LOCALBASE}/include/ereadline)
		list (APPEND xC_libraries ereadline)
	else ()
		list (APPEND xC_libraries readline)
	endif ()
elseif (WANT_LIBEDIT)
	pkg_check_modules (libedit REQUIRED libedit)
	list (APPEND xC_libraries ${libedit_LIBRARIES})
	include_directories (${libedit_INCLUDE_DIRS})
endif ()

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

include (GNUInstallDirs)
configure_file (${PROJECT_SOURCE_DIR}/config.h.in ${PROJECT_BINARY_DIR}/config.h)
include_directories (${PROJECT_SOURCE_DIR} ${PROJECT_BINARY_DIR})

# Generate IRC replies--we need a custom target because of the multiple outputs
add_custom_command (OUTPUT xD-replies.c xD.msg
	COMMAND ${PROJECT_SOURCE_DIR}/xD-gen-replies.sh
		> xD-replies.c < ${PROJECT_SOURCE_DIR}/xD-replies
	DEPENDS ${PROJECT_SOURCE_DIR}/xD-replies
	COMMENT "Generating files from the list of server numerics")
add_custom_target (replies DEPENDS ${PROJECT_BINARY_DIR}/xD-replies.c)

# Build
foreach (name xB xC xD)
	add_executable (${name} ${name}.c ${PROJECT_BINARY_DIR}/config.h)
	target_link_libraries (${name} ${project_libraries})
	add_threads (${name})
endforeach ()

add_dependencies (xD replies)
add_dependencies (xC replies)
target_link_libraries (xC ${xC_libraries})

# Tests
include (CTest)
if (BUILD_TESTING)
	add_executable (test-xC $<TARGET_PROPERTY:xC,SOURCES>)
	set_target_properties (test-xC PROPERTIES COMPILE_DEFINITIONS TESTING)
	target_link_libraries (test-xC $<TARGET_PROPERTY:xC,LINK_LIBRARIES>)
	add_threads (test-xC)
	add_dependencies (test-xC replies)

	add_test (NAME test-xC COMMAND test-xC)
	add_test (NAME custom-static-analysis
		COMMAND ${PROJECT_SOURCE_DIR}/test-static)
endif ()

# 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 xB xC xD DESTINATION ${CMAKE_INSTALL_BINDIR})
install (FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
# XXX: our defaults for XDG_DATA_DIRS expect /usr/local/shore or /usr/share
install (DIRECTORY plugins/xB/
	DESTINATION ${CMAKE_INSTALL_DATADIR}/xB/plugins USE_SOURCE_PERMISSIONS)
install (DIRECTORY plugins/xC/
	DESTINATION ${CMAKE_INSTALL_DATADIR}/xC/plugins)

# Generate documentation from text markup
find_program (ASCIIDOCTOR_EXECUTABLE asciidoctor)
if (NOT ASCIIDOCTOR_EXECUTABLE)
	message (FATAL_ERROR "asciidoctor not found")
endif ()

foreach (page xB xC xD)
	set (page_output "${PROJECT_BINARY_DIR}/${page}.1")
	list (APPEND project_MAN_PAGES "${page_output}")
	add_custom_command (OUTPUT ${page_output}
		COMMAND ${ASCIIDOCTOR_EXECUTABLE} -b manpage
			-a release-version=${project_version}
			"${PROJECT_SOURCE_DIR}/${page}.adoc"
			-o "${page_output}"
		DEPENDS ${page}.adoc
		COMMENT "Generating man page for ${page}" VERBATIM)
endforeach ()

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 ()

# CPack
set (CPACK_PACKAGE_DESCRIPTION_SUMMARY "Unreasonable IRC client, daemon and bot")
set (CPACK_PACKAGE_VERSION "${project_version_safe}")
set (CPACK_PACKAGE_VENDOR "Premysl Eric Janouch")
set (CPACK_PACKAGE_CONTACT "Přemysl Eric Janouch <p@janouch.name>")
set (CPACK_RESOURCE_FILE_LICENSE "${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)