'''DistUtilsExtra.auto

This provides a setup() method for distutils and DistUtilsExtra which infers as
many setup() arguments as possible. The idea is that your setup.py only needs
to have the metadata and some tweaks for unusual files/paths, in a "convention
over configuration" paradigm.

This currently supports:

 * Python modules (./*.py, only in root directory)
 * Python packages (all directories with __init__.py)
 * Docbook-XML GNOME help files (help/<language>/{*.xml,*.omf,figures})
 * GtkBuilder and Qt4 user interfaces (*.ui) [installed into
   prefix/share/<projectname>/]
 * D-Bus (*.conf and *.service)
 * GSettings schemas (*.gschema.xml)
 * polkit (*.policy.in)
 * Desktop files (*.desktop.in) [into prefix/share/applications, or
   prefix/share/autostart if they have "autostart" anywhere in the path]
 * KDE4 notifications (*.notifyrc.in)
 * Apport hooks (apport/*) [installed into /usr/share/apport/package-hooks]
 * scripts (all in bin/, and ./<projectname>
 * Auxiliary data files (in data/*) [into prefix/share/<projectname>/]
 * automatic po/POTFILES.in (with all source files which contain _())
 * automatic MANIFEST (everything except swap and backup files, *.pyc, and
   revision control)
 * manpages (*.[0-9])
 * icons (data/icons/<size>/<category>/*.{svg,png})
 * files which should go into /etc (./etc/*, copied verbatim)
 * determining "requires" from import statements in source code
 * determining "provides" from shipped packages and modules

If you follow above conventions, then you don't need any po/POTFILES.in,
./setup.cfg, or ./MANIFEST.in, and just need the project metadata (name,
author, license, etc.) in ./setup.py.
'''

# (c) 2009 Canonical Ltd.
# Author: Martin Pitt <martin.pitt@ubuntu.com>

import os, os.path, fnmatch, stat, sys, subprocess
import ast, locale
import distutils.core
from functools import reduce

from DistUtilsExtra import __version__ as __pkgversion
from DistUtilsExtra.command import *
import distutils.dir_util
import distutils.command.clean
import distutils.command.sdist
import distutils.command.install
import distutils.filelist

__version__ = __pkgversion

# FIXME: global variable, to share with build_i18n_auto
src = {}
src_all = {}

def setup(**attrs):
    '''Auto-inferring extension of standard distutils.core.setup()'''
    global src
    global src_all
    src_all = src_find(attrs)
    src = src_all.copy()

    # src_find() removes explicit scripts, but we need them for automatic
    # POTFILE.in building and requires
    src_all.update(set(attrs.get('scripts', [])))

    src_mark(src, 'setup.py')
    src_markglob(src, 'setup.cfg')

    # mark files in etc/*, handled by install_auto
    # don't install DistUtilsExtra if bundled with a source tarball
    # ignore packaging
    ignore_dirs = ['etc', 'DistUtilsExtra', 'debian']
    
    for f in src.copy():
        for d in ignore_dirs:
            if f.startswith(d + os.path.sep):
                src.remove(f)

    __cmdclass(attrs)
    __modules(attrs, src)
    __packages(attrs, src)
    __provides(attrs, src)
    __dbus(attrs, src)
    __gschema(attrs, src)
    __apport_hooks(attrs, src)
    __data(attrs, src)
    __scripts(attrs, src)
    __stdfiles(attrs, src)
    __ui(attrs, src)
    __manpages(attrs, src)

    if 'clean' not in sys.argv:
        __requires(attrs, src_all)

    distutils.core.setup(**attrs)

    if src:
        print('WARNING: the following files are not recognized by DistUtilsExtra.auto:')
        enc = locale.getpreferredencoding()
        for f in sorted(src):
            # ensure that we can always print the file name
            if(sys.version_info[0] < 3):
                # hack to make this work with Python 2
                f_loc = f.decode('ascii', 'ignore')
            else:
                f_loc = f.encode(enc, errors='replace').decode(enc, errors='replace')
            print ('  ' + f_loc)

#
# parts of setup()
#

class clean_build_tree(distutils.command.clean.clean):

    description = 'clean up build/ directory'

    def run(self):
        # clean build/mo
        if os.path.isdir('build'):
            distutils.dir_util.remove_tree('build')
        distutils.command.clean.clean.run(self)

def __cmdclass(attrs):
    '''Default cmdclass for DistUtilsExtra'''

    v = attrs.setdefault('cmdclass', {})
    v.setdefault('build', build_extra.build_extra)
    v.setdefault('build_help', build_help_auto)
    v.setdefault('build_i18n', build_i18n_auto)
    v.setdefault('build_icons', build_icons.build_icons)
    v.setdefault('install', install_auto)
    v.setdefault('clean', clean_build_tree)
    v.setdefault('sdist', sdist_auto)
    v.setdefault('pylint', pylint.pylint)

def __modules(attrs, src):
    '''Default modules'''

    if 'py_modules' in attrs:
        for mod in attrs['py_modules']:
            print(mod)
            src_markglob(src, os.path.join(mod, '*.py'))
        return

    mods = attrs.setdefault('py_modules', [])

    for f in src_fileglob(src, '*.py'):
        if os.path.sep not in f:
            mods.append(os.path.splitext(f)[0])
            src_markglob(src, f)

def __packages(attrs, src):
    '''Default packages'''

    if 'packages' in attrs:
        for pkg in attrs['packages']:
            src_markglob(src, os.path.join(pkg, '*.py'))
        return

    packages = attrs.setdefault('packages', [])

    for f in src_fileglob(src, '__init__.py'):
        if f.startswith('data' + os.path.sep):
            continue
        pkg = os.path.dirname(f)
        packages.append(pkg)
        src_markglob(src, os.path.join(pkg, '*.py'))

def __dbus(attrs, src):
    '''D-Bus configuration and services'''

    v = attrs.setdefault('data_files', [])

    # /etc/dbus-1/system.d/*.conf
    dbus_conf = []
    for f in src_fileglob(src, '*.conf'):
        if '-//freedesktop//DTD D-BUS Bus Configuration' in open(f).read():
            src_mark(src, f)
            dbus_conf.append(f)
    if dbus_conf:
        v.append(('/etc/dbus-1/system.d/', dbus_conf))

    session_service = []
    system_service = []
    # dbus services
    for f in src_fileglob(src, '*.service'):
        lines = [l.strip() for l in open(f).readlines()]
        if '[D-BUS Service]' not in lines:
            continue
        for l in lines:
            if l.startswith('User='):
                src_mark(src, f)
                system_service.append(f)
                break
        else:
            src_mark(src, f)
            session_service.append(f)
    if system_service:
        v.append(('share/dbus-1/system-services', system_service))
    if session_service:
        v.append(('share/dbus-1/services', session_service))

def __gschema(attrs, src):
    '''Install GSettings schema files'''
    
    v = attrs.setdefault('data_files', [])
    schema_glob = '*.gschema.xml'
    schemas = src_fileglob(src, schema_glob)
    if schemas:
        src_markglob(src, schema_glob)
        src_markglob(src, '*gschemas.compiled')
        v.append(('share/glib-2.0/schemas/', schemas))

def __apport_hooks(attrs, src):      
    '''Apport hooks'''  
    v = attrs.setdefault('data_files', [])

    # files will be copied to /usr/share/apport/package-hooks/
    hooks = []
    assert 'name' in attrs, 'You need to set the "name" property in setup.py'
    for f in src_fileglob(src, '*.py'):
        if f.startswith('apport/'):
            hooks.append(f)
            src_mark(src, f)
    if hooks:
        v.append(('share/apport/package-hooks/', hooks))

def __data(attrs, src):
    '''Install auxiliary data files.

    This installs everything from data/ except data/icons/ and *.in files (which
    are handled differently) into prefix/share/<projectname>/.
    '''
    v = attrs.setdefault('data_files', [])

    assert 'name' in attrs, 'You need to set the "name" property in setup.py'

    data_files = []
    for f in src.copy():
        if f.startswith('data/') and not f.startswith('data/icons/') and \
                not f.endswith('.desktop.in') and not f.endswith('.notifyrc.in'):
            if not os.path.islink(f):
                # symlinks are handled in install_auto
                v.append((os.path.join('share', attrs['name'], os.path.dirname(f[5:])), [f]))
            src_mark(src, f)

def __scripts(attrs, src):
    '''Install scripts.

    This picks executable scripts in bin/*, and an executable ./<projectname>.
    Other scripts have to be added manually; this is to avoid automatically
    installing test suites, build scripts, etc.
    '''
    assert 'name' in attrs, 'You need to set the "name" property in setup.py'

    scripts = []
    for f in src.copy():
        if f.startswith('bin/') or f == attrs['name']:
            st = os.lstat(f)
            if stat.S_ISREG(st.st_mode) and st.st_mode & stat.S_IEXEC:
                scripts.append(f)
                src_mark(src, f)
            elif stat.S_ISLNK(st.st_mode):
                # symlinks are handled in install_auto
                src_mark(src, f)

    if scripts:
        v = attrs.setdefault('scripts', [])
        v += scripts

def __stdfiles(attrs, src):
    '''Install/mark standard files.

    This covers COPYING, AUTHORS, README, etc.
    '''
    src_markglob(src, 'COPYING*')
    src_markglob(src, 'LICENSE*')
    src_markglob(src, 'AUTHORS')
    src_markglob(src, 'MANIFEST.in')
    src_markglob(src, 'MANIFEST')
    src_markglob(src, 'TODO')

    # install all README* from the root directory
    readme = []
    for f in src_fileglob(src, 'README*').union(src_fileglob(src, 'NEWS')):
        if os.path.sep not in f:
            readme.append(f)
            src_mark(src, f)
    if readme:
        assert 'name' in attrs, 'You need to set the "name" property in setup.py'

        attrs.setdefault('data_files', []).append((os.path.join('share', 'doc',
            attrs['name']), readme))

def __ui(attrs, src):
    '''Install GtkBuilder/Qt *.ui files'''

    ui = []
    for f in src_fileglob(src, '*.ui'):
        fd = open(f, 'rb')
        firstlines = fd.readline()
        firstlines += b'\n' + fd.readline()
        fd.close()
        if b'<interface' in firstlines or b'<ui version=' in firstlines:
            src_mark(src, f)
            ui.append(f)
    if ui:
        assert 'name' in attrs, 'You need to set the "name" property in setup.py'

        attrs.setdefault('data_files', []).append((os.path.join('share', 
            attrs['name']), ui))

def __manpages(attrs, src):
    '''Install manpages'''

    mans = {}
    for f in src_fileglob(src, '*.[0123456789]'):
        line = open(f).readline()
        if line.startswith('.TH '):
            src_mark(src, f)
            mans.setdefault(f[-1], []).append(f)
    v = attrs.setdefault('data_files', [])
    for section, files in mans.items():
        v.append((os.path.join('share', 'man', 'man' + section), files))

def __external_mod(cur_module, module, attrs):
    '''Check if given Python module is not included in Python or locally'''

    # filter out locally provided modules early, to avoid importing them (which
    # might raise an exception, or parse argv, etc.)
    if module in attrs['provides']:
        return False
    for m in _module_parents(module):
        if m in attrs['provides']:
            return False

    try:
        mod = __import__(module)
    except ImportError:
        # try relative import
        try:
            if cur_module:
                mod = __import__(cur_module + '.' + module)
            else:
                raise ImportError
        except ImportError:
            sys.stderr.write('ERROR: Python module %s not found\n' % module)
            return False
        except ValueError: # weird ctypes case with wintypes
            return False 
        except RuntimeError: # When Gdk can't be initialized
            return False
    except ValueError: # weird ctypes case with wintypes
        return False 
    except RuntimeError: # When Gdk can't be initialized
        return False

    if not hasattr(mod, '__file__'):
        # builtin module
        return False

    # filter out locally provided modules
    if mod.__name__ in attrs['provides']:
        return False

    return 'dist-packages' in mod.__file__ or 'site-packages' in mod.__file__ or \
            not mod.__file__.startswith(os.path.dirname(os.__file__))

def __add_imports(imports, file, attrs):
    '''Add all imported modules from file to imports set.

    This filters out modules which are shipped with Python itself.
    '''
    if os.path.exists(os.path.join(os.path.dirname(file), '__init__.py')):
        cur_module = '.'.join(file.split(os.path.sep)[:-1])
    else:
        # this might happen for paths like bin/<script> which we do not want to
        # treat as module for checking relative imports
        cur_module = None

    try:
        with open(file, 'rb') as f:
            # send binary blob for python2, otherwise sending an unicode object with
            # "encoding" directive makes ast triggering an exception in python2
            if(sys.version_info[0] < 3):
                file_content = f.read()
            else:
                file_content = f.read().decode('UTF-8')
            tree = ast.parse(file_content, file)

        for node in ast.walk(tree):
            if isinstance(node, ast.Import):
                for alias in node.names:
                    if alias.name and __external_mod(cur_module, alias.name, attrs):
                        imports.add(alias.name)
            if isinstance(node, ast.ImportFrom):
                if node.module == 'gi.repository':
                    for name in node.names:
                        imports.add('gi.repository.%s' % name.name)

                elif node.module and __external_mod(cur_module, node.module, attrs):
                    imports.add(node.module)
    except SyntaxError as e:
        sys.stderr.write('WARNING: syntax errors in %s: %s\n' % (file, str(e)))

def _module_parents(mod):
    '''Iterate over all parents of a module'''

    hierarchy = mod.split('.')
    hierarchy.pop()
    while hierarchy:
        yield '.'.join(hierarchy)
        hierarchy.pop()

def __filter_namespace(modules):
    '''Filter out modules which are already covered by a parent module
    
    E. g. this transforms ['os.path', 'os', 'foo.bar.baz', 'foo.bar'] to
    ['os', 'foo.bar'].
    '''
    result = set()

    for m in modules:
        if m.startswith('gi.repository.'):
            result.add(m)
            continue
        for p in _module_parents(m):
            if p in modules:
                break
        else:
            result.add(m)

    return sorted(result)

def __requires(attrs, src_all):
    '''Determine requires (if not set explicitly)'''

    if 'requires' in attrs:
        return

    imports = set()

    # iterate over all *.py and scripts which are Python
    for s in src_all:
        if s == 'setup.py':
            continue
        if s.startswith('data' + os.path.sep):
            continue
        ext = os.path.splitext(s)[1]
        if ext == '':
            try:
                with open(s) as f:
                    line = f.readline()
            except (UnicodeDecodeError, IOError):
                continue
            if not line.startswith('#!') or 'python' not in line:
                continue
        elif ext != '.py':
            continue
        __add_imports(imports, s, attrs)

    attrs['requires'] = __filter_namespace(imports)

def __provides(attrs, src_all):
    '''Determine provides (if not set explicitly)'''

    if 'provides' in attrs:
        return

    provides = list(attrs.get('py_modules', [])) # we need a copy here
    for p in attrs.get('packages', []):
        provides.append(p.replace(os.path.sep, '.'))
    attrs['provides'] = __filter_namespace(provides)
 
#
# helper functions
#

def src_find(attrs):
    '''Find source files.
    
    This ignores all source files which are explicitly specified as setup()
    arguments.
    '''
    src = set()

    # files explicitly covered in setup() call
    explicit = set(attrs.get('scripts', []))
    for (destdir, files) in attrs.get('data_files', []):
        explicit.update(files)

    for (root, dirs, files) in os.walk('.'):
        if root.startswith('./'):
            root = root[2:]
        if root == '.':
            root = ''
        if root.startswith('.') or \
                root.split(os.path.sep, 1)[0] in ('build', 'test', 'tests'):
            continue
        # data/icons is handled by build_icons
        if root.startswith(os.path.join('data', 'icons')):
            continue
        for f in files:
            ext = os.path.splitext(f)[1]
            if f.startswith('.') or ext in ('.pyc', '~', '.mo'):
                continue
            # po/*.po is taken care of by build_i18n
            if root == 'po' and (ext == '.po' or f == 'POTFILES.in'):
                continue
            
            path = os.path.join(root, f)
            if path not in explicit:
                src.add(path)

    return src

def src_fileglob(src, fnameglob):
    '''Return set of files which match fnameglob.'''

    result = set()
    for f in src:
        if fnmatch.fnmatch(os.path.basename(f), fnameglob):
            result.add(f)
    return result

def src_mark(src, path):
    '''Remove path from src.'''

    src.remove(path)

def src_markglob(src, pathglob):
    '''Remove all paths from src which match pathglob.'''

    for f in src.copy():
        if fnmatch.fnmatch(f, pathglob):
            src.remove(f)

#
# Automatic setup.cfg
#

class build_help_auto(build_help.build_help):
    def finalize_options(self):
        build_help.build_help.finalize_options(self)
        global src
        
        for data_set in self.get_data_files():
            for filepath in data_set[1]:
                src.remove(filepath)

class build_i18n_auto(build_i18n.build_i18n):
    def finalize_options(self):
        build_i18n.build_i18n.finalize_options(self)
        global src
        global src_all

        # add polkit files
        policy_files = []
        for f in src_fileglob(src, '*.policy.in'):
            src_mark(src, f)
            policy_files.append(f)
        if policy_files:
            try:
                xf = eval(self.xml_files)
            except TypeError:
                xf = []
            xf.append((os.path.join('share', 'polkit-1', 'actions'), policy_files))
            self.xml_files = repr(xf)

        # add desktop files
        desktop_files = []
        autostart_files = []
        notify_files = []
        for f in src_fileglob(src, '*.desktop.in'):
            src_mark(src, f)
            if 'autostart' in f:
                autostart_files.append(f)
            else:
                desktop_files.append(f)
        for f in src_fileglob(src, '*.notifyrc.in'):
            src_mark(src, f)
            notify_files.append(f)
        try:
            df = eval(self.desktop_files)
        except TypeError:
            df = []
        if desktop_files:
            df.append(('share/applications', desktop_files))
        if autostart_files:
            df.append(('share/autostart', autostart_files))
        if notify_files:
            df.append(('share/kde4/apps/' + self.distribution.get_name(), notify_files))
        self.desktop_files = repr(df)
        
        # mark PO template as known to handle
        try:
            src_mark(src, os.path.join(self.po_dir, self.distribution.get_name() + '.pot'))
        except KeyError:
            pass

    def run(self):
        '''Build a default POTFILES.in'''

        auto_potfiles_in = False
        exe_symlinks = []
        global src_all
        try:
            if not os.path.exists(os.path.join('po', 'POTFILES.in')):
                files = src_fileglob(src_all, '*.py')
                files.update(src_fileglob(src_all, '*.desktop.in'))
                files.update(src_fileglob(src_all, '*.notifyrc.in'))
                files.update(src_fileglob(src_all, '*.policy.in'))

                for f in src_fileglob(src_all, '*.ui'):
                    contents = open(f, 'rb').read()
                    if (b'<interface>\n' in contents or b'<interface ' in contents) and b'class="Gtk' in contents:
                        files.add('[type: gettext/glade]' + f)

                # find extensionless executable scripts which are Python files, and
                # generate a temporary *.py alias, so that they get caught by
                # intltool
                for f in reduce(lambda x, y: x.union(y[1]), self.distribution.data_files, src_all):
                    f_py = f + '.py'
                    if os.access(f, os.X_OK) and os.path.splitext(f)[1] == '' and \
                            not os.path.exists(f_py):
                        line = open(f, 'rb').readline()
                        if line.startswith(b'#!') and b'python' in line:
                            os.symlink(os.path.basename(f), f_py)
                            files.add(f_py)
                            exe_symlinks.append(f_py)

                if files:
                    if not os.path.isdir('po'):
                        os.mkdir('po')
                    potfiles_in = open('po/POTFILES.in', 'w')
                    potfiles_in.write('[encoding: UTF-8]\n')
                    for f in files:
                        potfiles_in.write(f + '\n')
                    potfiles_in.close()

                    auto_potfiles_in = True

            build_i18n.build_i18n.run(self)
        finally:
            for f in exe_symlinks:
                os.unlink(f)

        if auto_potfiles_in:
            os.unlink('po/POTFILES.in')
            try:
                os.rmdir('po')
            except:
                pass

#
# Automatic sdist
#

class sdist_auto(distutils.command.sdist.sdist):
    '''Default values for the 'sdist' command.
    
    Replace the manually maintained MANIFEST.in file by providing information
    about what the source tarball created using the 'sdist' command should
    contain in normal cases.
    
    It prevents the 'build' directory, version control related files, as well as
    compiled Python and gettext files and temporary files from being included in
    the source tarball.
    
    It's possible for subclasses to extend the 'filter_prefix' and
    'filter_suffix' properties.
    '''
    filter_prefix = ['build', '.git', '.svn', '.CVS', '.bzr', '.shelf']
    filter_suffix = ['.pyc', '.mo', '~', '.swp']
    
    def add_defaults(self):
        distutils.command.sdist.sdist.add_defaults(self)
        
        if os.path.exists('MANIFEST.in'):
            return

        self.filter_prefix.append(os.path.join('dist',
            self.distribution.get_name()))
        
        for f in distutils.filelist.findall():
            if f in self.filelist.files or \
                any(map(f.startswith, self.filter_prefix)) or \
                any(map(f.endswith, self.filter_suffix)):
                continue
            
            self.filelist.append(f)

#
# Automatic installation of ./etc/ and symlinks
#

class install_auto(distutils.command.install.install):
    def run(self):
        # install files from etc/
        if os.path.isdir('etc'):
            # work around a bug in copy_tree() which fails with "File exists" on
            # previously existing symlinks
            for f in distutils.filelist.findall('etc'):
                if not f.startswith('etc' + os.path.sep) or not os.path.islink(f):
                    continue
                try:
                    os.unlink(os.path.join(self.root, f))
                except OSError:
                    pass
            if not self.root:
                self.root = ''
            distutils.dir_util.copy_tree('etc', os.path.join(self.root, 'etc'),
                    preserve_times=0, preserve_symlinks=1, verbose=1)

        # install data/scripts symlinks
        for (path, dirs, files) in os.walk('.'):
            for f in files:
                f = os.path.join(path, f)
                if not os.path.islink(f):
                    continue

                if f.startswith('./bin/') or f.startswith('./data/'):
                    if f.startswith('./bin'):
                        dir = self.install_scripts
                        dest = os.path.join(dir, os.path.sep.join(f.split(os.path.sep)[2:]))
                    elif f.startswith('./data/icons'):
                        dir = os.path.join(self.install_data, 'share', 'icons', 'hicolor')
                        dest = os.path.join(dir, os.path.sep.join(f.split(os.path.sep)[3:]))
                    else:
                        dir = os.path.join(self.install_data, 'share', self.distribution.get_name())
                        dest = os.path.join(dir, os.path.sep.join(f.split(os.path.sep)[2:]))

                    d = os.path.dirname(dest)
                    if not os.path.isdir(d):
                        os.makedirs(d)
                    if os.path.exists(dest):
                        os.unlink(dest)
                    os.symlink(os.readlink(f), dest)

        distutils.command.install.install.run(self)

