From 5807ec7bc875d678f2e9502259d62d83b858a854 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sun, 29 Mar 2020 14:24:17 +0000
Subject: project: add os.py

---
 project/boost/build.py     |  3 ++-
 project/boost/directory.py |  3 ++-
 project/cmake/build.py     |  5 ++++-
 project/os.py              | 36 ++++++++++++++++++++++++++++++++++++
 project/utils.py           |  9 ---------
 5 files changed, 44 insertions(+), 12 deletions(-)
 create mode 100644 project/os.py

diff --git a/project/boost/build.py b/project/boost/build.py
index 82180a5..a33a538 100644
--- a/project/boost/build.py
+++ b/project/boost/build.py
@@ -25,6 +25,7 @@ from project.boost.directory import BoostDir
 from project.configuration import Configuration
 from project.linkage import Linkage
 from project.platform import Platform
+from project.os import on_linux_like
 import project.utils
 
 
@@ -81,7 +82,7 @@ class BuildParameters:
                 if link is Linkage.SHARED:
                     logging.warning("Cannot link the runtime statically to a dynamic library, going to link dynamically")
                     runtime_link = Linkage.SHARED
-                elif project.utils.on_linux():
+                elif on_linux_like():
                     logging.warning("Cannot link to the GNU C Library (which is assumed) statically, going to link dynamically")
                     runtime_link = Linkage.SHARED
             yield link, runtime_link
diff --git a/project/boost/directory.py b/project/boost/directory.py
index e50041f..17448b6 100644
--- a/project/boost/directory.py
+++ b/project/boost/directory.py
@@ -6,7 +6,8 @@
 import logging
 import os.path
 
-from project.utils import cd, run, on_windows
+from project.utils import cd, run
+from project.os import on_windows
 
 
 class BoostDir:
diff --git a/project/cmake/build.py b/project/cmake/build.py
index b15badd..5355c0b 100644
--- a/project/cmake/build.py
+++ b/project/cmake/build.py
@@ -151,9 +151,12 @@ def _parse_args(argv=None):
     parser.add_argument('--install', metavar='DIR', dest='install_dir',
                         type=project.utils.normalize_path,
                         help='install directory')
+
+    configuration_options = '/'.join(map(str, Configuration.all()))
     parser.add_argument('--configuration', metavar='CONFIG',
                         type=Configuration.parse, default=Configuration.DEBUG,
-                        help=f'build configuration ({"/".join(map(str, Configuration))})')
+                        help=f'build configuration ({configuration_options})')
+
     parser.add_argument('src_dir', metavar='DIR',
                         type=project.utils.normalize_path,
                         help='source directory')
diff --git a/project/os.py b/project/os.py
new file mode 100644
index 0000000..86ccaad
--- /dev/null
+++ b/project/os.py
@@ -0,0 +1,36 @@
+# Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "cmake-common" project.
+# For details, see https://github.com/egor-tensin/cmake-common.
+# Distributed under the MIT License.
+
+from enum import Enum
+import platform
+
+
+class OS(Enum):
+    WINDOWS = 'Windows'
+    LINUX = 'Linux'
+    CYGWIN = 'Cygwin'
+
+    def __str__(self):
+        return self.value
+
+    @staticmethod
+    def current():
+        system = platform.system()
+        if system == 'Windows':
+            return OS.WINDOWS
+        if system == 'Linux':
+            return OS.LINUX
+        if system.startswith('CYGWIN_NT'):
+            return OS.CYGWIN
+        raise NotImplementedError(f'unsupported OS: {system}')
+
+
+def on_windows():
+    return OS.current() is OS.WINDOWS
+
+
+def on_linux_like():
+    os = OS.current()
+    return os is OS.LINUX or os is OS.CYGWIN
diff --git a/project/utils.py b/project/utils.py
index 9d986b0..8c57f59 100644
--- a/project/utils.py
+++ b/project/utils.py
@@ -6,7 +6,6 @@
 from contextlib import contextmanager
 import logging
 import os.path
-import platform
 import subprocess
 
 
@@ -44,11 +43,3 @@ def run(cmd_line):
 
 def run_cmake(cmake_args):
     return run(['cmake'] + cmake_args)
-
-
-def on_windows():
-    return platform.system() == 'Windows'
-
-
-def on_linux():
-    return not on_windows()
-- 
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