# SPDX-License-Identifier: LGPL-3.0-or-later

# vim: ts=2 sw=2
#[=======================================================================[.rst:
FindResvg
---------
Try to find the shared-library build of resvg, the Rust SVG library

IMPORTED targets
^^^^^^^^^^^^^^^^

This module defines :prop_tgt:`IMPORTED` target ``Resvg::Resvg`` when
the library and headers are found.

Result Variables
^^^^^^^^^^^^^^^^

This module defines the following variables:

::

  Resvg_FOUND         - Library and header files found
  Resvg_INCLUDE_DIRS  - Include directory path
  Resvg_LIBRARIES     - Link path to the library
  Resvg_DEFINITIONS   - Compiler switches (currently unused)

Backwards compatibility
^^^^^^^^^^^^^^^^^^^^^^^

For compatibility with previous versions of this module, uppercase names
for FFmpeg and for all components are also recognized, and all-uppercase
versions of the cache variables are also created.

Control variables
^^^^^^^^^^^^^^^^^

The following variables can be used to provide path hints to the module:

RESVGDIR      - Set in the calling CMakeLists.txt or on the command line
ENV{RESVGDIR} - An environment variable in the cmake process context

Copyright (c) 2020, FeRD (Frank Dana) <ferdnyc@gmail.com>
#]=======================================================================]
include(FindPackageHandleStandardArgs)

### Macro: parse_resvg_version
#
# Read the resvg.h file and extract the definition
# for RESVG_VERSION, to use as our version string.
macro (parse_resvg_version)
  set(_header "${Resvg_INCLUDE_DIRS}/resvg.h")
  if(EXISTS "${_header}")
    #message(STATUS "Parsing Resvg version from ${_header}")
    file(STRINGS "${_header}" _version_def
      REGEX "^#define[ \t]+RESVG_VERSION[ \t]+\".*\"[ \t]*$")
    string(REGEX REPLACE
      "^.*RESVG_VERSION[ \t]+\"(.*)\".*$"
      "\\1"
      Resvg_VERSION "${_version_def}")
    #message(STATUS "Found Resvg version: ${Resvg_VERSION}")
  endif()
endmacro()

###
### Begin discovery
###

# CMake 3.4+ only: Convert relative paths to absolute
if(DEFINED RESVGDIR AND CMAKE_VERSION VERSION_GREATER 3.4)
  get_filename_component(RESVGDIR "${RESVGDIR}" ABSOLUTE
    BASE_DIR ${CMAKE_CURRENT_BINARY_DIR})
endif()

find_path(Resvg_INCLUDE_DIRS
  ResvgQt.h
  PATHS
    ${Resvg_ROOT}
    ${RESVGDIR}
    ${RESVGDIR}/include
    $ENV{RESVGDIR}
    $ENV{RESVGDIR}/include
    /usr/include
    /usr/local/include
  PATH_SUFFIXES
    c-api
    capi/include
    resvg
    resvg/include
    resvg/c-api
    resvg/capi/include
)

find_library(Resvg_LIBRARIES
  NAMES resvg
  PATHS
    ${Resvg_ROOT}
    ${RESVGDIR}
    ${RESVGDIR}/lib
    $ENV{RESVGDIR}
    $ENV{RESVGDIR}/lib
    /usr/lib
    /usr/local/lib
  PATH_SUFFIXES
    resvg
    target/release
    resvg/target/release
)

if (Resvg_INCLUDE_DIRS AND Resvg_LIBRARIES)
  set(Resvg_FOUND TRUE)
endif()
parse_resvg_version()

set(Resvg_LIBRARIES ${Resvg_LIBRARIES} CACHE STRING "The Resvg library link path")
set(Resvg_INCLUDE_DIRS ${Resvg_INCLUDE_DIRS} CACHE STRING "The Resvg include directories")
set(Resvg_DEFINITIONS "" CACHE STRING "The Resvg CFLAGS")
set(Resvg_VERSION ${Resvg_VERSION} CACHE STRING "The Resvg version in use")

mark_as_advanced(Resvg_LIBRARIES Resvg_INCLUDE_DIRS Resvg_DEFINITIONS)

# Give a nice error message if some of the required vars are missing.
find_package_handle_standard_args(Resvg
  REQUIRED_VARS Resvg_LIBRARIES Resvg_INCLUDE_DIRS
  VERSION_VAR Resvg_VERSION
)

# Export target
if(Resvg_FOUND AND NOT TARGET Resvg::Resvg)
  #message(STATUS "Creating IMPORTED target Resvg::Resvg")
  if (WIN32)
    # Windows mis-links SHARED library targets
    add_library(Resvg::Resvg UNKNOWN IMPORTED)
  else()
    # Linux needs SHARED to link because libresvg has no SONAME
    add_library(Resvg::Resvg SHARED IMPORTED)
    set_property(TARGET Resvg::Resvg APPEND PROPERTY
      IMPORTED_NO_SONAME TRUE)
  endif()

  set_property(TARGET Resvg::Resvg APPEND PROPERTY
    INTERFACE_INCLUDE_DIRECTORIES "${Resvg_INCLUDE_DIRS}")

  set_property(TARGET Resvg::Resvg APPEND PROPERTY
    INTERFACE_COMPILE_DEFINITIONS "${Resvg_DEFINITIONS}")

  set_property(TARGET Resvg::Resvg APPEND PROPERTY
    IMPORTED_LOCATION "${Resvg_LIBRARIES}")
endif()