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+#!/usr/bin/env python
+# Configure script for abakus.  I think it's better than the sample that came
+# with bksys.  Feel free to do with it what you want.
+# By Michael Pyne <[email protected]>
+
+import sys
+import re
+
+BOLD="\033[1m"
+RED="\033[91m"
+GREEN="\033[92m"
+YELLOW="\033[93m"
+CYAN="\033[96m"
+NORMAL="\033[0m"
+
+PROGRAM_NAME='abakus'
+
+# First let's see if they asked for help.
+if '--help' in sys.argv:
+    print '''This is a configure script to prepare %s for building.
+
+You can pass the command line argument debug=1 to enable debugging for the
+application, which can be useful if you have problems.
+
+Otherwise, just run ./configure, and if you don't already have scons, a mini
+version will be installed suitable for building %s.
+'''.replace('%s', PROGRAM_NAME)
+    sys.exit(0)
+
+# Check that we have the minimum version of Python needs to run SCons.
+if sys.hexversion < 0x02030000:
+    # Use regexp for compatibility with ancient Python
+    version = re.split(' ', sys.version)[0]
+
+    print RED + 'Sorry, your version of Python is too old.' + NORMAL
+    print PROGRAM_NAME + ' requires Python 2.3 or greater to build.'
+    print "\nYou have Python " + version
+    sys.exit(1)
+
+import os
+
+# Check if scons is installed.  We can use cool Python features now that we
+# know we aren't using an ancient version of Python.
+result = os.system('scons -v > /dev/null 2>&1')
+scons = 'scons'
+
+if os.WEXITSTATUS(result) == 0:
+    print GREEN + "scons already installed." + NORMAL
+else:
+    # If we didn't find scons, don't whine to the user about it, just fix it.
+    print YELLOW + 'scons not installed, installing local copy.' + NORMAL
+
+    # Split this into two steps since some tars don't use j to mean bzip2
+    # compressed.
+    result = os.system('bzcat bksys/scons-mini.tar.bz2 | tar x')
+
+    if os.WEXITSTATUS(result) != 0:
+	print RED + 'Unable to extract scons' + NORMAL
+	sys.exit(2)
+
+    scons = '%s/scons' % os.getcwd()
+
+# Now we now where scons is.  Let's create a Makefile (after we configure) so
+# that all the user has to do is type 'make'.  Allow the user to pass command
+# line arguments, which will be passed to the configure process.
+if len(sys.argv) < 2:
+    options = ''
+else:
+    options = " ".join(sys.argv[1:])
+    # reduce is pretty cool
+#    options = reduce(lambda x, y: x + '\n' + y, sys.argv[1:])
+
+result = os.system(scons + ' configure ' + options)
+if os.WEXITSTATUS(result) != 0:
+    print RED + 'Unable to configure scons' + NORMAL
+    sys.exit(3)
+
+# Recursive generates a makefile for a directory.  If topDir is True, the
+# Makefile is slightly different.
+def generate_makefile(dir, topDir = False):
+
+    file = name + "/Makefile"
+
+    # Write out Makefile.
+    try:
+        makefile = open(file, 'w')
+    except IOError:
+        print RED + "Unable to open " + file + NORMAL
+        sys.exit(4)
+
+    text = '''
+## Makefile automatically generated by configure
+
+SCONS=$scons
+
+# $scons            : compile
+# $scons -c         : clean
+# $scons install    : install
+# $scons -c install : uninstall and clean
+
+# Default target: use scons to build the program
+all:
+	@$(SCONS) -Q
+
+# Debugging possibilies:
+# $scons --debug=explain, $scons --debug=tree
+
+# To optimize the runtime:
+# $scons --max-drift=1 --implicit-deps-unchanged
+debug:
+	@$(SCONS) -Q --debug=tree
+
+clean:
+	@$(SCONS) -c
+
+install:
+	@$(SCONS) install
+
+uninstall:
+	@$(SCONS) uninstall
+
+# This target creates a tarball of the project (in theory)
+dist:
+	@$(SCONS) dist
+'''
+
+    if topDir:
+        text = text.replace('$scons', scons)
+    else:
+        text = text.replace('$scons', scons + ' -u')
+
+    try:
+        print "Generating " + GREEN + file + NORMAL
+        makefile.write(text)
+        makefile.close()
+    except IOError:
+        print RED + "Unable to write to the Makefile!" + NORMAL
+        sys.exit(5)
+
+# Recursively generate Makefiles for convienience.
+for name, dirs, files in os.walk('.'):
+    # Don't try to build hidden directories.
+    remove = filter(lambda x: x[0] == '.', dirs)
+    for i in remove:
+        dirs.remove(i)
+
+    if 'SConstruct' in files:
+        # We're in the very top directory.
+        generate_makefile(name, topDir = True)
+
+        for dir in ['cache', 'bksys']:
+            if dir in dirs:
+                dirs.remove(dir)
+    elif 'SConscript' in files:
+        generate_makefile(name)
+
+# The Makefile has been written, we're pretty much done.
+message = '''
+The Makefile(s) have been generated.  Type:
+	`make'         to build %s, and
+	`make install' to install %s.
+'''.replace('%s', PROGRAM_NAME)
+
+print GREEN + message + NORMAL