Add flesh to the skeleton

9 files changed, 705 insertions, 6 deletions

diff --git a/attoconf/_version.py b/attoconf/_version.py
index 7721bb4..8d9820c 100644
--- a/attoconf/_version.py
+++ b/attoconf/_version.py
@@ -7,7 +7,7 @@ major = 0
 
 # Incremented for releases with compatible API additions.
 # This is the number that is usually incremented.
-minor = 0
+minor = 1
 
 # Incremented if there is a bugfix release.
 # Might not be contiguous.
diff --git a/attoconf/core.py b/attoconf/core.py
index 0c01d5e..8b53209 100644
--- a/attoconf/core.py
+++ b/attoconf/core.py
@@ -17,21 +17,48 @@
 
 from __future__ import print_function, division, absolute_import
 
+from collections import namedtuple
+import os
+import sys
+
+from .help import Help
+
+# Nothing to see here. Move along.
+Option = namedtuple('Option', ['type', 'init'])
+class ArgumentError(Exception): pass
+
+def as_var(name):
+    return name.lstrip('-').upper()
+
+def trim_trailing_slashes(path):
+    p, s = os.path.split(path)
+    if not s:
+        return p
+    return path
+
 class Project(object):
     ''' A Project is a directory and the list of options that can be set.
     '''
     __slots__ = (
+            'srcdir',
             'aliases',
             'options',
             'help',
+            'checks',
     )
     def __init__(self, srcdir):
         ''' A Project is initially constructed from just the source directory
         '''
+        self.srcdir = trim_trailing_slashes(srcdir)
+        self.aliases = {}
+        self.options = {}
+        self.help = Help()
+        self.checks = []
 
     def add_help(self, text, hidden):
         ''' Directly add a line of text to the help.
         '''
+        self.help.add_text(text, hidden)
 
     def add_alias(self, key, expansion, help, hidden):
         ''' Add an alias.
@@ -40,8 +67,17 @@ class Project(object):
 
             The expansion is a list of other options, which may be aliases.
         '''
-
-    def add_option(self, name, init, type, check, help, hidden):
+        if key in self.aliases:
+            raise KeyError(key)
+        expansion = list(expansion)
+        self.aliases[key] = expansion
+        if help is None:
+            help = 'alias for ' + ' '.join(expansion)
+        self.help.add_option(key, help, hidden)
+
+    def add_option(self, name, init, type, check,
+            help, hidden,
+            help_var=None, help_def=None):
         ''' Add an actual option.
 
             This must be passed with a =.
@@ -56,27 +92,99 @@ class Project(object):
 
             Additionally, a line of help is added, with additional formatting.
         '''
+        if name in self.options:
+            raise KeyError(name)
+        self.options[name] = Option(init=init, type=type)
+        self.checks.append(lambda bld: check(bld, bld.vars[as_var(name)][0]))
+        if help_var is None:
+            help_var = as_var(name)
+        if help_def is None:
+            help_def = init
+        if help_def is not None:
+            help = '%s [%s]' % (help, help_def)
+
+        if help_var != name:
+            help_opt = '%s=%s' % (name, help_var)
+        else:
+            help_opt = name
+        self.help.add_option(help_opt, help, hidden)
+
+    def do_help(self, opt):
+        ''' Pseudo type-hook to be registered for --help (calls sys.exit).
+        '''
+        if opt == 'default':
+            hidden = False
+        elif opt == 'hidden':
+            hidden = True
+        else:
+            raise ValueError
+        self.help.print(sys.stdout, hidden)
+        sys.exit()
 
 class Build(object):
     ''' A Build is a directory and set of options applied to a Project.
     '''
     __slots__ = (
+            'bindir',
             'project',
             'vars',
     )
     def __init__(self, project, bindir):
-        ''' A Build is initially constructed from
+        ''' A Build is initially constructed from a project and a build dir.
         '''
+        self.project = project
+        self.bindir = trim_trailing_slashes(bindir)
+        self.vars = {as_var(k): (o.init, 'default')
+                for k, o in project.options.iteritems()}
 
     def apply_arg(self, arg):
         ''' Parse a single argument, expanding aliases.
         '''
+        alias = self.project.aliases.get(arg)
+        if alias is not None:
+            for e in alias:
+                # TODO: catch recursive aliases
+                # or should they be caught earlier?
+                self.apply_arg(e)
+            return
+
+        if '=' not in arg:
+            if arg in self.project.options:
+                raise ArgumentError('Option %s requires an argument' % arg)
+            elif arg.startswith('-'):
+                raise ArgumentError('Unknown option %s' % arg)
+            else:
+                raise ArgumentError('Unknown environment variable %s' % arg)
+
+        k, a = arg.split('=', 1)
+        opt = self.project.options.get(k)
+        if opt is None:
+            raise sys.exit('Unknown option %s' % k)
+        self.vars[as_var(k)] = (opt.type(a), 'command-line')
 
     def finish(self):
         ''' With the current set of variables, run all the checks
             and presumably produce some sort of output.
         '''
+        for check in self.project.checks:
+            check(self)
 
     def configure(self, args, env):
-        ''' Automatically call apply_arg() a bunch of times, then finish().
+        ''' First apply variables from the environment,
+            then call apply_arg() a bunch of times, then finish().
+        '''
+        for k in self.vars:
+            val = env.get(k)
+            if val is not None:
+                self.vars[k] = (self.project.options[k].type(val), 'environment')
+
+        for arg in args:
+            self.apply_arg(arg)
+
+        self.finish()
+
+    def relative_source(self):
+        ''' Return a relative path from the build tree to the source tree.
         '''
+        return os.path.relpath(os.path.realpath(self.project.srcdir),
+                os.path.realpath(self.bindir))
diff --git a/attoconf/help.py b/attoconf/help.py
new file mode 100644
index 0000000..610efde
--- /dev/null
+++ b/attoconf/help.py
@@ -0,0 +1,171 @@
+#   Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
+#
+#   This file is part of attoconf.
+#
+#   attoconf is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   attoconf is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with attoconf.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function, division, absolute_import
+
+def put_line_in_width(file, line, width, indent):
+    ''' Print a line with wrapping.
+    '''
+    line = line.rstrip(' ')
+    if len(line) <= width or ' ' not in line.lstrip(' '):
+        # this is not just an optimization
+        file.writelines([line, '\n'])
+        return
+    line += ' '
+    indents = indent * ' '
+
+    initial_spaces = len(line) - len(line.lstrip(' '))
+    while line.lstrip():
+        space = line.rfind(' ', initial_spaces, width + 1)
+        if space == -1:
+            space = line.find(' ', initial_spaces)
+        if space == -1:
+            space = len(line)
+        file.writelines([line[:space], '\n'])
+        line = indents + line[space+1:].lstrip(' ')
+        initial_spaces = indent
+
+
+class HelpSection(object):
+    ''' A help section contains some header lines and some related options.
+    '''
+    __slots__ = (
+            'headers',
+            'options',
+    )
+    def __init__(self):
+        ''' Create an empty help section.
+        '''
+        self.headers = []
+        self.options = []
+
+    def add_text(self, text, hidden):
+        ''' Add a header line.
+        '''
+        self.headers.append((hidden, text))
+
+    def add_option(self, name, text, hidden):
+        ''' Add an option with its description.
+        '''
+        self.options.append((hidden, name, text))
+
+    def print(self, file, hidden, width):
+        ''' Format (some of) the help text prettily.
+        '''
+        if self.options:
+            for oh, name, ht in self.options:
+                if oh <= hidden:
+                    break
+            else:
+                return False
+
+        # options longer than this will be split into multiple lines
+        split_width = width / 4 - 2
+        # longest option
+        longest_opt = 0
+        for oh, name, ht in self.options:
+            if oh > hidden:
+                continue
+            l = len(name) + 2
+            if l > split_width:
+                continue
+            if l > longest_opt:
+                longest_opt = l
+        if longest_opt == 0:
+            longest_opt = int(split_width)
+
+        for oh, ht in self.headers:
+            if oh > hidden:
+                continue
+            put_line_in_width(file, ht, width, 0)
+
+        for oh, name, ht in self.options:
+            if oh > hidden:
+                continue
+            # no, it's not really that simple
+            if len(name) > longest_opt:
+                file.writelines(['  ', name, '\n'])
+                name = ''
+            line = '  %-*s%s' % (longest_opt, name, ht)
+            put_line_in_width(file, line, width, longest_opt + 2)
+
+        return True
+
+
+def detect_terminal_width(fd, DEFAULT_WIDTH=float('inf')):
+    ''' Detect the width of a terminal.
+    '''
+    if not isinstance(fd, int):
+        fd = getattr(fd, 'fileno', lambda: -1)()
+    if fd == -1:
+        return DEFAULT_WIDTH
+
+    import fcntl
+    import termios
+    try:
+        buf = fcntl.ioctl(fd, termios.TIOCGWINSZ, b'xx' * 4)
+    except IOError as e:
+        import errno
+        if e.errno != errno.ENOTTY:
+            raise
+        return DEFAULT_WIDTH
+    import struct
+    ws_row, ws_col, ws_xpixel, ws_ypixel = struct.unpack('HHHH', buf)
+    return ws_col
+
+
+class Help(object):
+    ''' Help collects the set of flavor text and option descriptions
+        related to arguments.
+    '''
+    __slots__ = (
+            'sections',
+    )
+    def __init__(self):
+        ''' Help does not take any arguments during construction.
+        '''
+        self.sections = []
+
+    def add_text(self, text, hidden):
+        ''' Add a header line.
+
+            This creates a new section if the last line wasn't a header.
+        '''
+        if not self.sections or self.sections[-1].options:
+            self.sections.append(HelpSection())
+        self.sections[-1].add_text(text, hidden)
+
+    def add_option(self, name, text, hidden):
+        ''' Add an option with its description to the current section.
+
+            This creates a new section only if it is first.
+        '''
+        if not self.sections:
+            self.sections.append(HelpSection())
+        self.sections[-1].add_option(name, text, hidden)
+
+    def print(self, file, hidden, width=0):
+        ''' Print all the help at the given level of hidden-ness.
+        '''
+        if width == 0:
+            width = detect_terminal_width(file)
+        if width < 20:
+            width = 80
+
+        for s in self.sections:
+            if s.print(file, hidden, width):
+                file.write('\n')
diff --git a/attoconf/tests/__init__.py b/attoconf/tests/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/attoconf/tests/__init__.py
diff --git a/attoconf/tests/test_core.py b/attoconf/tests/test_core.py
new file mode 100644
index 0000000..88bf616
--- /dev/null
+++ b/attoconf/tests/test_core.py
@@ -0,0 +1,129 @@
+#   Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
+#
+#   This file is part of attoconf.
+#
+#   attoconf is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   attoconf is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with attoconf.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function, division, absolute_import
+
+import unittest
+
+from attoconf.core import Project, Build
+
+from cStringIO import StringIO
+import sys
+
+class ReplacingStdout(object):
+    __slots__ = ('old', 'new')
+    def __init__(self, new):
+        self.old = None
+        self.new = new
+    def __enter__(self):
+        self.old = sys.stdout
+        sys.stdout = self.new
+    def __exit__(self, type, value, traceback):
+        sys.stdout = self.old
+        del self.old
+
+class TestProject(unittest.TestCase):
+    def test_help(self):
+        proj = Project('foo')
+        proj.add_help('General:', False)
+        proj.add_alias('--help', ['--help=default'],
+                help='display standard help, then exit', hidden=False)
+        proj.add_option('--help', init=None,
+                type=proj.do_help, check=None,
+                help='display some subset of help', hidden=False,
+                help_var='TYPE')
+        proj.help.add_option('--help=hidden',
+                'display help you should never ever ever care about', True)
+        proj.add_option('--foo', init='asdf',
+                type=str, check=None,
+                help='set frob target', hidden=False)
+        proj.add_option('--bar', init=None,
+                type=str, check=None,
+                help='set frob source', hidden=False,
+                help_def='FOO')
+
+        build = Build(proj, 'bar')
+
+        out = StringIO()
+        with ReplacingStdout(out):
+            with self.assertRaises(SystemExit):
+                build.apply_arg('--help')
+        self.assertEqual(out.getvalue(), '''
+General:
+  --help       display standard help, then exit
+  --help=TYPE  display some subset of help
+  --foo=FOO    set frob target [asdf]
+  --bar=BAR    set frob source [FOO]
+
+'''[1:])
+
+        out = StringIO()
+        with ReplacingStdout(out):
+            with self.assertRaises(SystemExit):
+                build.apply_arg('--help=hidden')
+        self.assertEqual(out.getvalue(), '''
+General:
+  --help         display standard help, then exit
+  --help=TYPE    display some subset of help
+  --help=hidden  display help you should never ever ever care about
+  --foo=FOO      set frob target [asdf]
+  --bar=BAR      set frob source [FOO]
+
+'''[1:])
+
+    def test_path(self):
+        proj = Project('foo/')
+        build = Build(proj, 'bar/')
+        self.assertEquals(build.project.srcdir, 'foo')
+        self.assertEquals(build.bindir, 'bar')
+        self.assertEquals(build.relative_source(), '../foo')
+
+    def test_configure(self):
+        def check_foo(bld, foo):
+            self.assertEqual(foo, 'B')
+        def check_bar(bld, bar):
+            self.assertEqual(bar, 1)
+        def check_qux(bld, qux):
+            self.assertEqual(qux, None)
+        def check_var(bld, var):
+            self.assertEqual(var, 'value')
+
+        proj = Project('.')
+        proj.add_alias('--alias', ['--foo=A', '--bar=1', '--foo=B'],
+                help=None, hidden=False)
+        proj.add_option('--foo', init=None,
+                type=str, check=check_foo,
+                help='help for string foo', hidden=False)
+        proj.add_option('--bar', init=0,
+                type=int, check=check_bar,
+                help='help for int bar', hidden=False)
+        proj.add_option('--qux', init=None,
+                type=int, check=check_qux,
+                help='help for int qux', hidden=False)
+        proj.add_option('VAR', init='',
+                type=str, check=check_var,
+                help='help for string VAR', hidden=False)
+
+        build = Build(proj, '.')
+        build.configure(['--alias'], {'VAR': 'value'})
+        self.assertEqual(build.vars,
+                {
+                    'FOO': ('B', 'command-line'),
+                    'BAR': (1, 'command-line'),
+                    'QUX': (None, 'default'),
+                    'VAR': ('value', 'environment'),
+                })
diff --git a/attoconf/tests/test_help.py b/attoconf/tests/test_help.py
new file mode 100644
index 0000000..ea42c28
--- /dev/null
+++ b/attoconf/tests/test_help.py
@@ -0,0 +1,195 @@
+#   Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
+#
+#   This file is part of attoconf.
+#
+#   attoconf is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   attoconf is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with attoconf.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function, division, absolute_import
+
+import unittest
+
+from attoconf.help import Help, HelpSection, put_line_in_width
+
+from cStringIO import StringIO
+
+class TestHelpSection(unittest.TestCase):
+    def test_basic(self):
+        sec = HelpSection()
+        sec.add_text('foo', False)
+        sec.add_option('--foo', 'FOO', True)
+        sec.add_text('bar', True)
+        sec.add_option('--bar', 'BAR', False)
+        self.assertEqual(sec.headers, [(False, 'foo'), (True, 'bar')])
+        self.assertEqual(sec.options, [(True, '--foo', 'FOO'), (False, '--bar', 'BAR')])
+
+        out = StringIO()
+        sec.print(out, False, float('inf'))
+        self.assertEqual(out.getvalue(), '''foo
+  --bar  BAR
+''')
+
+        out = StringIO()
+        sec.print(out, True, float('inf'))
+        self.assertEqual(out.getvalue(), '''foo
+bar
+  --foo  FOO
+  --bar  BAR
+''')
+
+    def test_width(self):
+        out = StringIO()
+        put_line_in_width(out, 'foo bar baz', float('inf'), 0)
+        self.assertEqual(out.getvalue(), 'foo bar baz\n')
+
+        out = StringIO()
+        put_line_in_width(out, 'foo bar baz', 10, 0)
+        self.assertEqual(out.getvalue(), 'foo bar\nbaz\n')
+
+        out = StringIO()
+        put_line_in_width(out, 'foo bar baz', 10, 2)
+        self.assertEqual(out.getvalue(), 'foo bar\n  baz\n')
+
+        out = StringIO()
+        put_line_in_width(out, '   foo bar baz', 10, 0)
+        self.assertEqual(out.getvalue(), '   foo bar\nbaz\n')
+
+        out = StringIO()
+        put_line_in_width(out, '    foo bar baz', 10, 0)
+        self.assertEqual(out.getvalue(), '    foo\nbar baz\n')
+
+        out = StringIO()
+        put_line_in_width(out, '    foo bar baz', 10, 3)
+        self.assertEqual(out.getvalue(), '    foo\n   bar baz\n')
+
+        out = StringIO()
+        put_line_in_width(out, '    foo bar baz', 10, 4)
+        self.assertEqual(out.getvalue(), '    foo\n    bar\n    baz\n')
+
+        out = StringIO()
+        put_line_in_width(out, 'really-long-string', float('inf'), 0)
+        self.assertEqual(out.getvalue(), 'really-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, '  really-long-string', float('inf'), 0)
+        self.assertEqual(out.getvalue(), '  really-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, 'really-long-string', 10, 0)
+        self.assertEqual(out.getvalue(), 'really-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, '  really-long-string', 10, 0)
+        self.assertEqual(out.getvalue(), '  really-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, 'short really-long-string', float('inf'), 0)
+        self.assertEqual(out.getvalue(), 'short really-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, '  short really-long-string', float('inf'), 0)
+        self.assertEqual(out.getvalue(), '  short really-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, 'short really-long-string', 10, 0)
+        self.assertEqual(out.getvalue(), 'short\nreally-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, '  short really-long-string', 10, 0)
+        self.assertEqual(out.getvalue(), '  short\nreally-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, 'short really-long-string', 10, 1)
+        self.assertEqual(out.getvalue(), 'short\n really-long-string\n')
+
+        out = StringIO()
+        put_line_in_width(out, '  short really-long-string', 10, 1)
+        self.assertEqual(out.getvalue(), '  short\n really-long-string\n')
+
+    def test_print(self):
+        sec = HelpSection()
+        sec.add_option('--abcdefghijklmnopqrstuvwxyz',
+                'ABCDEFGHIJKLMNOPQRSTUVWXYZ', False)
+
+        out = StringIO()
+        sec.print(out, False, 80)
+        self.assertEqual(out.getvalue(), '''
+  --abcdefghijklmnopqrstuvwxyz
+                    ABCDEFGHIJKLMNOPQRSTUVWXYZ
+'''[1:])
+
+        sec.add_option('--foo', 'FOO', False)
+        sec.add_option('--frob', 'FROB', False)
+
+        out = StringIO()
+        sec.print(out, False, 80)
+        self.assertEqual(out.getvalue(), '''
+  --abcdefghijklmnopqrstuvwxyz
+          ABCDEFGHIJKLMNOPQRSTUVWXYZ
+  --foo   FOO
+  --frob  FROB
+'''[1:])
+
+        out = StringIO()
+        sec.print(out, False, float('inf'))
+        self.assertEqual(out.getvalue(), '''
+  --abcdefghijklmnopqrstuvwxyz  ABCDEFGHIJKLMNOPQRSTUVWXYZ
+  --foo                         FOO
+  --frob                        FROB
+'''[1:])
+
+
+class TestHelp(unittest.TestCase):
+    def test_print(self):
+        help = Help()
+        help.add_option('--invisible', 'You can\'t see this', True)
+        help.add_text('General:', False)
+        help.add_option('--help', 'show this', False)
+        help.add_option('--version', 'show that', True)
+        help.add_text('Other stuff:', False)
+        help.add_text('with long header:', True)
+        help.add_option('--foo-lets-make-it-long-just-because', 'I\'m bored', False)
+        help.add_text('Visibility:', False)
+        help.add_option('--sneaky', 'This may be surprising. It also works as a demonstration of multi-line wrapping, just because.', True)
+
+        out = StringIO()
+        help.print(out, True, 80)
+        self.assertEqual(out.getvalue(), '''
+  --invisible  You can't see this
+
+General:
+  --help     show this
+  --version  show that
+
+Other stuff:
+with long header:
+  --foo-lets-make-it-long-just-because
+                    I'm bored
+
+Visibility:
+  --sneaky  This may be surprising. It also works as a demonstration of
+            multi-line wrapping, just because.
+
+'''[1:])
+
+        out = StringIO()
+        help.print(out, False, 80)
+        self.assertEqual(out.getvalue(), '''
+General:
+  --help  show this
+
+Other stuff:
+  --foo-lets-make-it-long-just-because
+                    I'm bored
+
+'''[1:])
diff --git a/attoconf/tests/test_version.py b/attoconf/tests/test_version.py
new file mode 100644
index 0000000..1ce855d
--- /dev/null
+++ b/attoconf/tests/test_version.py
@@ -0,0 +1,94 @@
+#   Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
+#
+#   This file is part of attoconf.
+#
+#   attoconf is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   attoconf is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with attoconf.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function, division, absolute_import
+
+import unittest
+
+from attoconf.version import require_version, string as version_string
+
+class TestVersion(unittest.TestCase):
+    def test_parse(self):
+        # don't do this
+        name, version, dist = version_string.split(' ', 2)
+        self.assertEqual(name, 'attoconf')
+        major, minor, patch = [int(x) for x in version.split('.')]
+        assert dist.startswith('(')
+        assert dist.endswith(')')
+        dist = dist[1:-1]
+        assert '(' not in dist
+        assert ')' not in dist
+        assert '\n' not in dist
+        from attoconf._version import distributor
+        self.assertEqual(dist, distributor)
+
+    def test_check(self):
+        from attoconf._version import major, minor, patch
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor - 1, patch - 1)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor - 1, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor - 1, patch + 1)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor + 0, patch - 1)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor + 0, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor + 0, patch + 1)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor + 1, patch - 1)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor + 1, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major - 1, minor + 1, patch + 1)
+        if 1:
+            require_version(major + 0, minor - 1, patch - 1)
+        if 1:
+            require_version(major + 0, minor - 1, patch + 0)
+        if 1:
+            require_version(major + 0, minor - 1, patch + 1)
+        if 1:
+            require_version(major + 0, minor + 0, patch - 1)
+        if 1:
+            require_version(major + 0, minor + 0, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major + 0, minor + 0, patch + 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 0, minor + 1, patch - 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 0, minor + 1, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major + 0, minor + 1, patch + 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor - 1, patch - 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor - 1, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor - 1, patch + 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor + 0, patch - 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor + 0, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor + 0, patch + 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor + 1, patch - 1)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor + 1, patch + 0)
+        with self.assertRaises(SystemExit):
+            require_version(major + 1, minor + 1, patch + 1)
diff --git a/demo-project/configure b/demo-project/configure
index 8f09a35..dc29870 100755
--- a/demo-project/configure
+++ b/demo-project/configure
@@ -23,7 +23,7 @@ import os
 import sys
 
 from attoconf.version import require_version, string as version_string
-require_version(0, 0)
+require_version(0, 1)
 
 from attoconf.core import Project, Build
 
diff --git a/test-everything.sh b/test-everything.sh
new file mode 100755
index 0000000..e16866b
--- /dev/null
+++ b/test-everything.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+python -m unittest discover "$@"