Rewrite the bootstrap script in Python

This allows trouble-free builds on platforms with non-standard Python
executable names. As a bonus, it passes the arguments received on to
configure.py, so you don't have to reconfigure to build in a
non-standard manner.

HACKING

@@ -1,5 +1,5 @@
 Adjusting build flags:
-  CFLAGS=-O3 ./configure
+  CFLAGS=-O3 ./configure.py
   and rebuild.
 
 Test-driven development:
@@ -56,7 +56,7 @@ Windows development on Linux (this is kind of hacky right now):
 
 Windows development on Windows:
 - install mingw, msys, and python
-- in the mingw shell, put Python in your path, and: sh bootstrap.sh
+- in the mingw shell, put Python in your path, and: python bootstrap.py
 - to reconfigure, run 'python configure.py'
 - remember to strip the resulting executable if size matters to you
 - you'll need to rename ninja.exe into my-ninja.exe during development,

README

@@ -5,7 +5,7 @@ See the manual -- http://martine.github.com/ninja/manual.html or
 doc/manual.asciidoc included in the distribution -- for background
 and more details.
 
-To build, run ./bootstrap.sh.  It first blindly compiles all non-test
+To build, run ./bootstrap.py.  It first blindly compiles all non-test
 source files together, then re-builds Ninja using itself.  You should
 end up with a 'ninja' binary in the source root.  Run './ninja -h' for
 help.

bootstrap.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+# Copyright 2011 Google Inc. All Rights Reserved.
+#
+# 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 sys
+import os
+import glob
+import errno
+import subprocess
+
+def run(*args, **kwargs):
+    try:
+        subprocess.check_call(*args, **kwargs)
+    except subprocess.CalledProcessError, e:
+        sys.exit(e.returncode)
+
+# Compute system-specific CFLAGS/LDFLAGS as used in both in the below
+# g++ call as well as in the later configure.py.
+cflags = os.environ.get('CFLAGS', '')
+ldflags = os.environ.get('LDFLAGS', '')
+if sys.platform.startswith('freebsd'):
+    cflags += ' -I/usr/local/include'
+    ldflags += ' -L/usr/local/lib'
+
+print 'Building ninja manually...'
+
+try:
+	os.mkdir('build')
+except OSError, e:
+	if e.errno != errno.EEXIST:
+		raise
+
+with open('src/browse.py') as browse_py:
+    with open('build/browse_py.h', 'w') as browse_py_h:
+        run(['./src/inline.sh', 'kBrowsePy'],
+            stdin=browse_py, stdout=browse_py_h)
+
+pattern = r'test\.cc$|\.in\.cc$'
+
+if sys.platform.startswith('win32'):
+    pattern += r'|/browse\.cc$|/subprocess\.cc$'
+else:
+    pattern += r'|-win32\.cc$'
+
+sources = [src for src in glob.glob('src/*.cc') if not re.search(pattern, src)]
+
+args = [os.environ.get('CXX', 'g++'), '-Wno-deprecated',
+        '-DNINJA_PYTHON="' + sys.executable + '"']
+args.extend(cflags.split())
+args.extend(ldflags.split())
+args.extend(['-o', 'ninja.bootstrap'])
+args.extend(sources)
+run(args)
+
+print 'Building ninja using itself...'
+run([sys.executable, 'configure.py'] + sys.argv[1:])
+run(['./ninja.bootstrap'])
+os.unlink('ninja.bootstrap')
+
+print 'Done!'

bootstrap.sh

@@ -1,53 +0,0 @@
-#!/bin/sh
-
-# Copyright 2011 Google Inc. All Rights Reserved.
-#
-# 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.
-
-set -e
-
-SYSTEMNAME=`uname -s`
-
-# Compute system-specific CFLAGS/LDFLAGS as used in both in the below
-# g++ call as well as in the later configure.py.
-if [ "${SYSTEMNAME}" = "Linux" ]; then
-    export CFLAGS="${CFLAGS}"
-    export LDFLAGS="${LDFLAGS}"
-elif [ "${SYSTEMNAME}" = "FreeBSD" ]; then
-    export CFLAGS="${CFLAGS} -I/usr/local/include"
-    export LDFLAGS="${LDFLAGS} -L/usr/local/lib"
-fi
-
-echo "Building ninja manually..."
-mkdir -p build
-./src/inline.sh kBrowsePy < src/browse.py > build/browse_py.h
-
-pattern='test\.cc$\|\.in\.cc$'
-case "$SYSTEMNAME" in
-  MINGW32*)
-    pattern="$pattern"'\|/browse\.cc$\|/subprocess\.cc$'
-    ;;
-  *)
-    pattern="$pattern"'\|-win32\.cc$'
-    ;;
-esac
-srcs=$(ls src/*.cc | grep -v "$pattern")
-
-${CXX:-g++} -Wno-deprecated ${CFLAGS} ${LDFLAGS} -o ninja.bootstrap $srcs
-
-echo "Building ninja using itself..."
-python ./configure.py
-./ninja.bootstrap
-rm ninja.bootstrap
-
-echo "Done!"

src/browse.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 #
 # Copyright 2001 Google Inc. All Rights Reserved.
 #