7 files changed, 334 insertions, 0 deletions
diff --git a/docs/markdown/CMake-module.md b/docs/markdown/CMake-module.md
new file mode 100644
index 0000000..4cc97cf
--- /dev/null
+++ b/docs/markdown/CMake-module.md
@@ -0,0 +1,71 @@
+# CMake module
+
+This module provides helper tools for generating cmake package files.
+
+
+## Usage
+
+To use this module, just do: **`cmake = import('cmake')`**. The
+following functions will then be available as methods on the object
+with the name `cmake`. You can, of course, replace the name `cmake`
+with anything else.
+
+### cmake.write_basic_package_version_file()
+
+This function is the equivalent of the corresponding [CMake function](https://cmake.org/cmake/help/v3.11/module/CMakePackageConfigHelpers.html#generating-a-package-version-file),
+it generates a `name` package version file.
+
+* `name`: the name of the package.
+* `version`: the version of the generated package file.
+* `compatibility`: a string indicating the kind of compatibility, the accepted values are
+`AnyNewerVersion`, `SameMajorVersion`, `SameMinorVersion` or `ExactVersion`.
+It defaults to `AnyNewerVersion`. Depending on your cmake installation some kind of
+compatibility may not be available.
+* `install_dir`: optional installation directory, it defaults to `$(libdir)/cmake/$(name)`
+
+
+Example:
+
+```meson
+cmake = import('cmake')
+
+cmake.write_basic_package_version_file(name: 'myProject', version: '1.0.0')
+```
+
+### cmake.configure_package_config_file()
+
+This function is the equivalent of the corresponding [CMake function](https://cmake.org/cmake/help/v3.11/module/CMakePackageConfigHelpers.html#generating-a-package-configuration-file),
+it generates a `name` package configuration file from the `input` template file. Just like the cmake function
+in this file the `@PACKAGE_INIT@` statement will be replaced by the appropriate piece of cmake code.
+The equivalent `PATH_VARS` argument is given through the `configuration` parameter.
+
+* `name`: the name of the package.
+* `input`: the template file where that will be treated for variable substitutions contained in `configuration`.
+* `install_dir`: optional installation directory, it defaults to `$(libdir)/cmake/$(name)`.
+* `configuration`: a `configuration_data` object that will be used for variable substitution in the template file.
+
+
+Example:
+
+meson.build:
+
+```meson
+cmake = import('cmake')
+
+conf = configuration_data()
+conf.set_quoted('VAR', 'variable value')
+
+cmake.configure_package_config_file(
+    name: 'myProject',
+    input: 'myProject.cmake.in',
+    configuration: conf
+)
+```
+
+myProject.cmake.in:
+
+```text
+@PACKAGE_INIT@
+
+set(MYVAR VAR)
+```
diff --git a/docs/sitemap.txt b/docs/sitemap.txt
index b8c41b4..f80c279 100644
--- a/docs/sitemap.txt
+++ b/docs/sitemap.txt
@@ -30,6 +30,7 @@ index.md
 		Subprojects.md
 		Disabler.md
 		Modules.md
+			CMake-module.md
 			Dlang-module.md
 			Gnome-module.md
 			Hotdoc-module.md
diff --git a/mesonbuild/modules/cmake.py b/mesonbuild/modules/cmake.py
new file mode 100644
index 0000000..d98213d
--- /dev/null
+++ b/mesonbuild/modules/cmake.py
@@ -0,0 +1,221 @@
+# Copyright 2018 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import re
+import os, os.path, pathlib
+import shutil
+
+from . import ExtensionModule, ModuleReturnValue
+
+from .. import build, dependencies, mesonlib, mlog
+from ..interpreterbase import permittedKwargs
+from ..interpreter import ConfigurationDataHolder
+
+
+COMPATIBILITIES = ['AnyNewerVersion', 'SameMajorVersion', 'SameMinorVersion', 'ExactVersion']
+
+# Taken from https://github.com/Kitware/CMake/blob/master/Modules/CMakePackageConfigHelpers.cmake
+PACKAGE_INIT_BASE = '''
+####### Expanded from \\@PACKAGE_INIT\\@ by configure_package_config_file() #######
+####### Any changes to this file will be overwritten by the next CMake run ####
+####### The input file was @inputFileName@ ########
+get_filename_component(PACKAGE_PREFIX_DIR "${CMAKE_CURRENT_LIST_DIR}/@PACKAGE_RELATIVE_PATH@" ABSOLUTE)
+'''
+PACKAGE_INIT_EXT = '''
+# Use original install prefix when loaded through a "/usr move"
+# cross-prefix symbolic link such as /lib -> /usr/lib.
+get_filename_component(_realCurr "${CMAKE_CURRENT_LIST_DIR}" REALPATH)
+get_filename_component(_realOrig "@absInstallDir@" REALPATH)
+if(_realCurr STREQUAL _realOrig)
+  set(PACKAGE_PREFIX_DIR "@installPrefix@")
+endif()
+unset(_realOrig)
+unset(_realCurr)
+'''
+
+
+class CmakeModule(ExtensionModule):
+    cmake_detected = False
+    cmake_root = None
+
+    def __init__(self, interpreter):
+        super().__init__(interpreter)
+        self.snippets.add('configure_package_config_file')
+
+    def detect_voidp_size(self, compilers, env):
+        compiler = compilers.get('c', None)
+        if not compiler:
+            compiler = compilers.get('cpp', None)
+
+        if not compiler:
+            raise mesonlib.MesonException('Requires a C or C++ compiler to compute sizeof(void *).')
+
+        return compiler.sizeof('void *', '', env)
+
+    def detect_cmake(self):
+        if self.cmake_detected:
+            return True
+
+        cmakebin = dependencies.ExternalProgram('cmake', silent=False)
+        p, stdout, stderr = mesonlib.Popen_safe(cmakebin.get_command() + ['--system-information', '-G', 'Ninja'])[0:3]
+        if p.returncode != 0:
+            mlog.log('error retrieving cmake informations: returnCode={0} stdout={1} stderr={2}'.format(p.returncode, stdout, stderr))
+            return False
+
+        match = re.search('\n_INCLUDED_FILE \\"([^"]+)"\n', stdout.strip())
+        if not match:
+            mlog.log('unable to determine cmake root')
+            return False
+
+        # compilerpath is something like '/usr/share/cmake-3.5/Modules/Platform/Linux-GNU-CXX.cmake'
+        # or 'C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/Platform/Windows-MSVC-CXX.cmake' under windows
+        compilerpath = match.group(1)
+        pos = compilerpath.find('/Modules/Platform/')
+        if pos < 0:
+            mlog.log('unknown _INCLUDED_FILE path scheme')
+            return False
+
+        cmakePath = pathlib.PurePath(compilerpath[0:pos])
+        self.cmake_root = os.path.join(*cmakePath.parts)
+        self.cmake_detected = True
+        return True
+
+    @permittedKwargs({'version', 'name', 'compatibility', 'install_dir'})
+    def write_basic_package_version_file(self, state, _args, kwargs):
+        version = kwargs.get('version', None)
+        if not isinstance(version, str):
+            raise mesonlib.MesonException('Version must be specified.')
+
+        name = kwargs.get('name', None)
+        if not isinstance(name, str):
+            raise mesonlib.MesonException('Name not specified.')
+
+        compatibility = kwargs.get('compatibility', 'AnyNewerVersion')
+        if not isinstance(compatibility, str):
+            raise mesonlib.MesonException('compatibility is not string.')
+        if compatibility not in COMPATIBILITIES:
+            raise mesonlib.MesonException('compatibility must be either AnyNewerVersion, SameMajorVersion or ExactVersion.')
+
+        if not self.detect_cmake():
+            raise mesonlib.MesonException('Unable to find cmake')
+
+        pkgroot = kwargs.get('install_dir', None)
+        if pkgroot is None:
+            pkgroot = os.path.join(state.environment.coredata.get_builtin_option('libdir'), 'cmake', name)
+        if not isinstance(pkgroot, str):
+            raise mesonlib.MesonException('Install_dir must be a string.')
+
+        template_file = os.path.join(self.cmake_root, 'Modules', 'BasicConfigVersion-{}.cmake.in'.format(compatibility))
+        if not os.path.exists(template_file):
+            raise mesonlib.MesonException('your cmake installation doesn\'t support the {} compatibility'.format(compatibility))
+
+        version_file = os.path.join(state.environment.scratch_dir, '{}ConfigVersion.cmake'.format(name))
+
+        conf = {
+            'CVF_VERSION': (version, ''),
+            'CMAKE_SIZEOF_VOID_P': (str(self.detect_voidp_size(state.compilers, state.environment)), '')
+        }
+        mesonlib.do_conf_file(template_file, version_file, conf, 'meson')
+
+        res = build.Data(mesonlib.File(True, state.environment.get_scratch_dir(), version_file), pkgroot)
+        return ModuleReturnValue(res, [res])
+
+    def create_package_file(self, infile, outfile, PACKAGE_RELATIVE_PATH, extra, confdata):
+        package_init = PACKAGE_INIT_BASE.replace('@PACKAGE_RELATIVE_PATH@', PACKAGE_RELATIVE_PATH)
+        package_init = package_init.replace('@inputFileName@', infile)
+        package_init += extra
+
+        try:
+            with open(infile, "r") as fin:
+                data = fin.readlines()
+        except Exception as e:
+            raise mesonlib.MesonException('Could not read input file %s: %s' % (infile, str(e)))
+
+        result = []
+        regex = re.compile(r'(?:\\\\)+(?=\\?@)|\\@|@([-a-zA-Z0-9_]+)@')
+        for line in data:
+            line = line.replace('@PACKAGE_INIT@', package_init)
+            line, _missing = mesonlib.do_replacement(regex, line, 'meson', confdata)
+
+            result.append(line)
+
+        outfile_tmp = outfile + "~"
+        with open(outfile_tmp, "w", encoding='utf-8') as fout:
+            fout.writelines(result)
+
+        shutil.copymode(infile, outfile_tmp)
+        mesonlib.replace_if_different(outfile, outfile_tmp)
+
+    @permittedKwargs({'input', 'name', 'install_dir', 'configuration'})
+    def configure_package_config_file(self, interpreter, state, args, kwargs):
+        if len(args) > 0:
+            raise mesonlib.MesonException('configure_package_config_file takes only keyword arguments.')
+
+        if 'input' not in kwargs:
+            raise mesonlib.MesonException('configure_package_config_file requires "input" keyword.')
+        inputfile = kwargs['input']
+        if isinstance(inputfile, list):
+            if len(inputfile) != 1:
+                m = "Keyword argument 'input' requires exactly one file"
+                raise mesonlib.MesonException(m)
+            inputfile = inputfile[0]
+        if not isinstance(inputfile, (str, mesonlib.File)):
+            raise mesonlib.MesonException("input must be a string or a file")
+        if isinstance(inputfile, str):
+            inputfile = mesonlib.File.from_source_file(state.environment.source_dir, state.subdir, inputfile)
+
+        ifile_abs = inputfile.absolute_path(state.environment.source_dir, state.environment.build_dir)
+
+        if 'name' not in kwargs:
+            raise mesonlib.MesonException('"name" not specified.')
+        name = kwargs['name']
+
+        (ofile_path, ofile_fname) = os.path.split(os.path.join(state.subdir, '{}Config.cmake'.format(name)))
+        ofile_abs = os.path.join(state.environment.build_dir, ofile_path, ofile_fname)
+
+        if 'install_dir' not in kwargs:
+            install_dir = os.path.join(state.environment.coredata.get_builtin_option('libdir'), 'cmake', name)
+        if not isinstance(install_dir, str):
+            raise mesonlib.MesonException('"install_dir" must be a string.')
+
+        if 'configuration' not in kwargs:
+            raise mesonlib.MesonException('"configuration" not specified.')
+        conf = kwargs['configuration']
+        if not isinstance(conf, ConfigurationDataHolder):
+            raise mesonlib.MesonException('Argument "configuration" is not of type configuration_data')
+
+        prefix = state.environment.coredata.get_builtin_option('prefix')
+        abs_install_dir = install_dir
+        if not os.path.isabs(abs_install_dir):
+            abs_install_dir = os.path.join(prefix, install_dir)
+
+        PACKAGE_RELATIVE_PATH = os.path.relpath(prefix, abs_install_dir)
+        extra = ''
+        if re.match('^(/usr)?/lib(64)?/.+', abs_install_dir):
+            extra = PACKAGE_INIT_EXT.replace('@absInstallDir@', abs_install_dir)
+            extra = extra.replace('@installPrefix@', prefix)
+
+        self.create_package_file(ifile_abs, ofile_abs, PACKAGE_RELATIVE_PATH, extra, conf.held_object)
+        conf.mark_used()
+
+        conffile = os.path.normpath(inputfile.relative_name())
+        if conffile not in interpreter.build_def_files:
+            interpreter.build_def_files.append(conffile)
+
+        res = build.Data(mesonlib.File(True, ofile_path, ofile_fname), install_dir)
+        interpreter.build.data.append(res)
+
+        return res
+
+def initialize(*args, **kwargs):
+    return CmakeModule(*args, **kwargs)
diff --git a/test cases/common/211 cmake module/cmake_project/CMakeLists.txt b/test cases/common/211 cmake module/cmake_project/CMakeLists.txt
new file mode 100644
index 0000000..cd91584
--- /dev/null
+++ b/test cases/common/211 cmake module/cmake_project/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 2.8)
+project(cmakeMeson C)
+
+find_package(cmakeModule REQUIRED)
+\ No newline at end of file
diff --git a/test cases/common/211 cmake module/installed_files.txt b/test cases/common/211 cmake module/installed_files.txt
new file mode 100644
index 0000000..f8b11f0
--- /dev/null
+++ b/test cases/common/211 cmake module/installed_files.txt
@@ -0,0 +1,2 @@
+usr/lib/cmake/cmakeModule/cmakeModuleConfig.cmake
+usr/lib/cmake/cmakeModule/cmakeModuleConfigVersion.cmake
+\ No newline at end of file
diff --git a/test cases/common/211 cmake module/meson.build b/test cases/common/211 cmake module/meson.build
new file mode 100644
index 0000000..68f9993
--- /dev/null
+++ b/test cases/common/211 cmake module/meson.build
@@ -0,0 +1,31 @@
+project('cmakeModule', 'c', version: '1.0.0')
+
+if build_machine.system() == 'cygwin'
+  error('MESON_SKIP_TEST CMake is broken on Cygwin.')
+endif
+
+cmake_bin = find_program('cmake', required: false)
+if not cmake_bin.found()
+  error('MESON_SKIP_TEST CMake not installed.')
+endif
+
+cc = meson.get_compiler('c')
+if cc.get_id() == 'clang-cl' and meson.backend() == 'ninja' and build_machine.system() == 'windows'
+    error('MESON_SKIP_TEST CMake installation nor operational for vs2017 clangclx64ninja')
+endif
+
+cmake = import('cmake')
+
+cmake.write_basic_package_version_file(version: '0.0.1',
+   name: 'cmakeModule',
+)
+
+conf = configuration_data()
+conf.set('MYVAR', 'my variable value')
+conf.set_quoted('MYQUOTEDVAR', 'my quoted variable value')
+
+cmake.configure_package_config_file(
+    input: 'projectConfig.cmake.in',
+    name: 'cmakeModule',
+    configuration: conf,
+)
diff --git a/test cases/common/211 cmake module/projectConfig.cmake.in b/test cases/common/211 cmake module/projectConfig.cmake.in
new file mode 100644
index 0000000..fa3dfca
--- /dev/null
+++ b/test cases/common/211 cmake module/projectConfig.cmake.in
@@ -0,0 +1,4 @@
+@PACKAGE_INIT@
+
+set(MYVAR "@MYVAR@")
+set(MYQUOTEDVAR @MYQUOTEDVAR@)