Started work on basic color logging framework.

meson.py

@@ -19,6 +19,7 @@ import sys, stat, traceback
 import os.path
 import environment, interpreter
 import backends, build
+import mlog
 
 from coredata import version, MesonException
 
@@ -130,10 +131,10 @@ if __name__ == '__main__':
     except Exception as e:
         if isinstance(e, MesonException):
             if hasattr(e, 'file') and hasattr(e, 'lineno'):
-                print('\nMeson encountered an error in %s:%d:' % (e.file, e.lineno))
+                mlog.log(mlog.red('\nMeson encountered an error in %s:%d:' % (e.file, e.lineno)))
             else:
-                print('\nMeson encountered an error:')
-            print(e)
+                mlog.log(mlog.red('\nMeson encountered an error:'))
+            mlog.log(e)
             sys.exit(1)
         else:
             traceback.print_exc()

mlog.py

@@ -0,0 +1,55 @@
+# Copyright 2012 Jussi Pakkanen
+
+# 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 sys, os, platform
+
+"""This is (mostly) a standalone module used to write logging
+information about Meson runs. Some output goes to screen,
+some to logging dir and some goes to both."""
+
+colorize_console = platform.system().lower() != 'windows' and os.isatty(sys.stdout.fileno())
+
+class AnsiDecorator():
+    plain_code = "\033[0m"
+    
+    def __init__(self, text, code):
+        self.text = text
+        self.code = code
+    
+    def get_text(self, with_codes):
+        if with_codes:
+            return self.code + self.text + AnsiDecorator.plain_code
+
+def bold(text):
+    return AnsiDecorator(text, "\033[1m")
+
+def red(text):
+    return AnsiDecorator(text, "\033[1;31m")
+
+def green(text):
+    return AnsiDecorator(text, "\033[1;32m")
+
+def cyan(text):
+    return AnsiDecorator(text, "\033[1;36m")
+
+def log(*args):
+    arr = []
+    for arg in args:
+        if isinstance(arg, str):
+            arr.append(arg)
+        elif isinstance(arg, AnsiDecorator):
+            arr.append(arg.get_text(colorize_console))
+        else:
+            arr.append(str(arg))
+    print(*arr)