puredata-gui 0.48.1-3 / usr / bin / pd-gui-plugin

#!/usr/bin/python3

# enable/disable pd-gui plugins
#
# features
# - enables and disables pd-gui-plugins installed by Debian
# - per-user OR per-site configuration
# - lists available plugins
# - list enabled plugins

# flags
# * --user: act on per-user configuration  (install into / list only plugins
#                                           enabled in "~/pd-externals")
# * --system: act on site-wide configuration (install into / list only plugins
#                                           enabled in "/usr/lib/pd/extra")
# if no flag is given, we try to install into /usr/lib/pd/extra and if that
#                      fails into ~/pd-externals we list all enabled plugins
#
# commands
# * enable <plugin>: enable given plugin
# * disable <plugin>: disable given plugin
# * enabled: list enabled plugins
# * enabled <plugin>: returns 0 is plugin is enabled, 1 otherwise
# * available: list available plugins
# * available <plugin>: returns 0 is plugin is available, 1 otherwise

import os
import sys

availablepaths = ['/usr/share/pd-gui/plugins-available',
                  '/etc/pd/plugins-available']
# sitepath = ['/usr/local/lib/pd-externals',
#             '/usr/lib/pd/extra',
#             '/usr/lib/puredata/extra']
sitepath = ['/etc/pd/plugins-enabled', ]
userpath = ['~/pd-externals', ]
additionalpaths = []


def stripSuffix(s, suffix):
    """strips a <suffix> (if present) from the string <s>"""
    if s.endswith(suffix):
        return s[:-len(suffix)]
    return s


def basename(p):
    return os.path.basename(os.path.normpath(p))


def getPluginPaths(site=True, user=True):
    paths = []
    if additionalpaths:
        paths += additionalpaths
    if site:
        paths += sitepath
    if user:
        paths += userpath
    return [os.path.expanduser(x) for x in paths]


def getWriteablePath(paths):
    # first check if any of the paths are existing and writable
    for p in paths:
        if os.access(p, os.W_OK):
            return p
    # if none was writeable, check if we can create one
    for p in paths:
        try:
            os.mkdir(p)
            if os.access(p, os.W_OK):
                return p
        except (PermissionError, FileExistsError, FileNotFoundError):
            continue
    return None


def isPlugin(path, name):
    fullpath = os.path.join(path, name)
    if fullpath.endswith("-plugin") and os.path.isdir(fullpath):
        return fullpath
    if fullpath.endswith("-plugin.tcl") and os.path.isfile(fullpath):
        return fullpath
    return None


def printAvailable(paths):
    for p in paths:
        if not os.path.isdir(p):
            continue
        for plugin in [stripSuffix(stripSuffix(x, ".tcl"), "-plugin")
                       for x in os.listdir(p)
                       if isPlugin(p, x)]:
            print(plugin)


def findPlugin(paths, plugin):
    for p in paths:
        for suffix in ["-plugin", "-plugin.tcl", ""]:
            plug = isPlugin(p, plugin+suffix)
            if plug:
                return plug
    return False


def cmd_enable(pluginpaths, plugin):
    # check if plugin is already enabled
    if findPlugin(getPluginPaths(), plugin):
        sys.exit("plugin '%s' seems to be already enabled!" % (plugin,))
    # check if the plugin is available
    plug = findPlugin(availablepaths, plugin)
    if not plug:
        sys.exit("plugin '%s' seems to be not available!" % (plugin,))
    p = getWriteablePath(pluginpaths)
    if not p:
        sys.exit("unable to enable plugin in one of these paths:\n\t" +
                 "\n\t".join(pluginpaths))
    pluglink = os.path.join(p, basename(plug))
    try:
        os.symlink(plug, pluglink)
    except FileExistsError:
        sys.exit("unable to enable '%s' as '%s'" % (plugin, pluglink))


def cmd_disable(pluginpath, plugin):
    plug = findPlugin(getPluginPaths(), plugin)
    if not plug:
        sys.exit("plugin '%s' seems not to be enabled!" % (plugin,))
    if not os.path.islink(plug):
        sys.exit("Cannot disable non-symlinked plugin '%s'" % (plugin,))
    try:
        os.unlink(plug)
    except (PermissionError, FileNotFoundError) as e:
        sys.exit("Could not disable plugin '%s': %s" % (plugin, e))


def cmd_enabled(pluginpath, plugin=None):
    if plugin:
        result = findPlugin(pluginpath, plugin)
        if result:
            print(result)
        sys.exit(not result)
    else:
        printAvailable(pluginpath)


def cmd_available(pluginpath, plugin=None):
    cmd_enabled(availablepaths, plugin)


def parseCmdlineArgs():
    import argparse
    parser = argparse.ArgumentParser(description="""
    This is a Debian specific tool that allows you to
    selectively enable or disable Pd GUI plugins,
    either for a single user (yourself),
    or for all users of the system
    (if you have the administrative privileges to do so).
    """,
                                     )
    parser.add_argument('-u', '--user', action='store_true',
                        help="""per-user operation
                        (e.g. install to ~/pd-externals/)""")
    parser.add_argument('-s', '--system', action='store_true',
                        help="""site-wide operation
                        (requires supercow powers)""")
    parser.add_argument('--pool-dir', action='append',
                        metavar="POOL-DIRECTORY",
                        help="""alternative directory
                        holding available plugins""")
    parser.add_argument('--install-dir', action='append',
                        metavar="INSTALL-DIRECTORY",
                        help="""alternative directory
                        to install enabled plugins""")
    parser.add_argument('-v', '--version',
                        action='version', version='%(prog)s 0.1')
    subparsers = parser.add_subparsers(dest='command', metavar="<command>")

    sparser = subparsers.add_parser('enable', help='enable a plugin')
    sparser.add_argument('plugin', metavar='PLUGIN', help='plugin to enable')

    sparser = subparsers.add_parser('disable', help='disable a plugin')
    sparser.add_argument('plugin', metavar='PLUGIN', help='plugin to disable')

    sparser = subparsers.add_parser('enabled', help='list enabled plugins')
    sparser.add_argument('plugin', metavar='PLUGIN', nargs='?',
                         help='if present, check if plugin is enabled')

    sparser = subparsers.add_parser('available', help='list available plugins')
    sparser.add_argument('plugin', metavar='PLUGIN', nargs='?',
                         help='if present, check if plugin is available')

    args = parser.parse_args()

    if not args.command:
        parser.print_help()

    return args


if __name__ == '__main__':
    cmds = {
        'enable': cmd_enable,
        'disable': cmd_disable,
        'enabled': cmd_enabled,
        'available': cmd_available,
        }

    args = parseCmdlineArgs()
    if not args.install_dir and not args.user and not args.system:
        args.user = True
        args.system = True
    additionalpaths = args.install_dir
    pluginpaths = getPluginPaths(args.system, args.user)

    if args.pool_dir:
        availablepaths = [x for x in args.pool_dir if os.path.isdir(x)]
        if not availablepaths:
            sys.exit("None of these paths are valid;\n\t" +
                     "\n\t".join(args.pool_dir))

    if args.command in cmds:
        cmds[args.command](pluginpaths, args.plugin)