added use command. added some functions to bashrc.

pythonbrew/commands/use.py

@@ -0,0 +1,29 @@
+import os
+import sys
+from pythonbrew.basecommand import Command
+from pythonbrew.define import PATH_PYTHONS, PATH_BIN
+from pythonbrew.util import Package, write_temp
+from pythonbrew.log import logger
+
+class UseCommand(Command):
+    name = "use"
+    usage = "%prog VERSION"
+    summary = "Using the given version of python"
+    
+    def run_command(self, options, args):
+        if not args:
+            logger.info("Unrecognized command line argument: argument not found.")
+            sys.exit(1)
+        pkg = Package(args[0])
+        pkgname = pkg.name
+        pkgdir = os.path.join(PATH_PYTHONS, pkgname)
+        if not os.path.isdir(pkgdir):
+            logger.info("`%s` is not installed." % pkgname)
+            sys.exit(1)
+        pkgbin = os.path.join(pkgdir,'bin')
+        
+        write_temp('%s:%s' % (PATH_BIN, pkgbin))
+        
+        logger.info("Using `%s`" % pkgname)
+
+UseCommand()