Commit of the first commands

Sketching implementation for search, download, install, mirror. There is also
a pretty useless "user" command.

.gitignore

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+env

COPYING

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+Copyright (c) 2011, Daniele Varrazzo <daniele.varrazzo@gmail.com>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+* The name of Daniele Varrazzo may not be used to endorse or promote
+  products derived from this software without specific prior written
+  permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

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+# pgxn.client Makefile
+#
+# Copyright (C) 2011 Daniele Varrazzo
+# 
+# This file is part of the PGXN client
+
+.PHONY: env
+
+PYTHON := python$(PYTHON_VERSION)
+PYTHON_VERSION ?= $(shell $(PYTHON) -c 'import sys; print ("%d.%d" % sys.version_info[:2])')
+ENV_DIR = $(shell pwd)/env
+ENV_BIN = $(ENV_DIR)/bin
+ENV_LIB = $(ENV_DIR)/lib
+EASY_INSTALL = PYTHONPATH=$(ENV_LIB) $(ENV_BIN)/easy_install-$(PYTHON_VERSION) -d $(ENV_LIB) -s $(ENV_BIN)
+EZ_SETUP = $(ENV_BIN)/ez_setup.py
+
+
+# Install development dependencies.
+
+env: easy_install
+	mkdir -p $(ENV_BIN)
+	mkdir -p $(ENV_LIB)
+	$(EASY_INSTALL) uri
+	$(EASY_INSTALL) argparse
+	$(EASY_INSTALL) zc.buildout
+
+easy_install: ez_setup
+	PYTHONPATH=$(ENV_LIB) $(PYTHON) $(EZ_SETUP) -d $(ENV_LIB) -s $(ENV_BIN) setuptools
+
+ez_setup:
+	mkdir -p $(ENV_BIN)
+	mkdir -p $(ENV_LIB)
+	wget -O $(EZ_SETUP) http://peak.telecommunity.com/dist/ez_setup.py

README

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+A command line tool to interact with the PostgreSQL Extension Network.

pgxn/__init__.py

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+"""
+pgxn.client -- pgxn package
+
+This package is currently only meant as a placeholder.
+"""
+
+# Copyright (C) 2011 Daniele Varrazzo
+
+# This file is part of the PGXN client
+

pgxn/client/__init__.py

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+"""
+pgxn.client -- main package
+"""
+
+# Copyright (C) 2011 Daniele Varrazzo
+
+# This file is part of the PGXN client
+
+__version__ = '0.1dev0'
+
+
+import re
+
+from pgxn.client.errors import BadSpecError
+
+class Name(str):
+    """A string representing a package name."""
+    # TODO: range
+
+class SemVer(str):
+    """A string representing a semantic version specification.
+
+    See: http://semver.org/
+    """
+    # TODO: format and ordering
+
+
+class Spec(object):
+    """A name together with a range of versions."""
+    def __init__(self, name, op=None, ver=None):
+        self.name = name
+        self.op = op
+        self.ver = ver
+
+    @classmethod
+    def parse(self, spec):
+        """Parse a spec string and return name and version required.
+
+        Return (name, op, version), op and version can be None.
+        Raise BadSpecError if couldn't parse.
+        """
+        # split operator/version and name
+        m = re.match(r'(.+?)(?:(==|=|>=|>|<=|<)(.*))?$', spec)
+        if m is None:
+            raise BadSpecError('bad format')
+
+        name = Name(m.group(1))
+        op = m.group(2)
+        if op == '=':
+            op = '=='
+
+        if op is not None:
+            ver = SemVer(m.group(3))
+        else:
+            ver = None
+
+        return Spec(name, op, ver)
+
+
+class Extension(object):
+    def __init__(self, name=None, version=None, status=None, abstract=None):
+        self.name = name
+        self.version = version
+        self.status = status
+        self.abstract = abstract
+
+    @classmethod
+    def from_json(self, data):
+        data1 = data[data['latest']]
+        name = data['extension']
+        abstract = data1.get('abstract')
+
+        rv = []
+        for ver, vdata in data['versions'].iteritems():
+            vdata = vdata[0]
+            ver = SemVer(ver)
+            ext = Extension(name=name, version=ver,
+                status=vdata.get('status', 'stable'),
+                abstract=abstract)
+            rv.append(ext)
+
+        rv.sort(key=lambda x: x.version, reverse=True)
+        return rv
+