Add first version of sievedit

Includes set-active and edit commands.

setup.cfg

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+[metadata]
+name = sievedit
+version = 0.1
+description = Simple tool to 
+
+[options]
+packages = find:
+install_requires =
+	click
+	python-editor
+	clintermission
+	sievelib
+
+[options.entry_points]
+console_scripts = 
+	sievedit = sievedit:main
+
+[options.packages.find]
+exclude=env
+
+[flake8]
+max-line-length = 120
+exclude = .git,__pycache__,*.egg-info,*lib/python*
+ignore = E241,E741,W503,W504

setup.py

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+import setuptools
+
+
+setuptools.setup()

sievedit.py

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+#!/usr/bin/env python3
+import difflib
+import functools
+
+import click
+from clintermission import cli_select_item
+import editor
+from sievelib.managesieve import Client
+
+
+def default_options(f):
+    @click.option('--server', prompt=True, help='sieve server to connect to')
+    @click.option('-u', '--user', prompt=True, help='user to connect as')
+    @click.option('--password', prompt=True, hide_input=True,
+                  help='Passwort to connect with. It\'s discouraged to pass passwords.'
+                       'Use the automatic prompt instead.')
+    @click.option('--starttls/--no-starttls', default=True, help='Connect with starttls')
+    @functools.wraps(f)
+    def wrapper(*args, **kwargs):
+        f(*args, **kwargs)
+
+    return wrapper
+
+
+@click.group()
+def main():
+    pass
+
+
+@main.command()
+@default_options
+@click.option('--script-name',
+              help='script name to set as active. If not provided, choices will be presented.')
+def active(server, user, password, starttls, script_name):
+    """Connect to a SIEVE server and set a script as active"""
+    c = Client(server)
+    c.connect(user, password, starttls=starttls)
+    active, scripts = c.listscripts()
+
+    if not script_name:
+        if len(scripts + [active]) == 1:
+            click.echo('Only a single script available: {}'.format((scripts + [active])[0]))
+        _, script_name = cli_select_item(zip(sorted(['{} (active)'.format(active)] + scripts),
+                                             sorted([active] + scripts)))
+
+    if active == script_name:
+        click.echo('Script {} is already active.'.format(script_name))
+        return
+
+    if script_name not in scripts:
+        click.echo('Error: script {} cannot be found. Valid choices are: {}'
+                   .format(script_name, ', '.join(scripts)))
+        return 1
+
+    c.setactive(script_name)
+
+
+DEFAULT_TEMPLATE = """\
+# Example script. Edit as you like
+require ["fileinto"];
+# rule:[amazon]
+if header :contains "To" "amazon@" {
+  fileinto "INBOX.amazon";
+  stop;
+}
+# rule:[games]
+if anyof (header :contains "To" "gw2@",
+    header :contains "To" "humblebundle@",
+    header :contains "To" "steam@",
+    header :contains "To" "socialclub@",
+    header :contains "To" "uplay@" ) {
+  fileinto "INBOX.games";
+  stop;
+}
+# rule:[paypal]
+if header :contains "To" "paypal@" {
+  fileinto "INBOX.paypal";
+  stop;
+}
+"""
+
+
+@main.command()
+@default_options
+@click.option('--script-name', help='Edit this script or create it')
+def edit(server, user, password, starttls, script_name):
+    """Connect to a SIEVE server, download, edit and upload a script"""
+    c = Client(server)
+    c.connect(user, password, starttls=starttls)
+    active, scripts = c.listscripts()
+
+    if not script_name:
+        _, script_name = cli_select_item(zip(sorted(['{} (active)'.format(active)] + scripts),
+                                             sorted([active] + scripts)))
+    if script_name not in (scripts + [active]):
+        msg = 'Script {} does not exist. Create new script?'
+        click.confirm(msg.format(script_name), abort=True)
+        original_content = DEFAULT_TEMPLATE
+        newly_created = True
+    else:
+        original_content = c.getscript(script_name)
+        newly_created = False
+
+    new_content = editor.edit(contents=original_content).decode('utf-8')
+    if new_content.strip() == original_content and not newly_created:
+        click.echo('No changes. Aborting.')
+        return
+
+    while not c.checkscript(new_content):
+        click.confirm('Script is invalid. Try again?', abort=True)
+        new_content = editor.edit(contents=new_content).decode('utf-8')
+        if new_content == original_content and not newly_created:
+            click.echo('No changes. Aborting.')
+            return
+
+    diff = difflib.unified_diff(original_content.splitlines(), new_content.splitlines(),
+                                fromfile='before', tofile='after')
+    if not newly_created:
+        click.echo('Following changes were made:\n{}'.format('\n'.join(diff)))
+    click.confirm('Upload new version?', abort=True)
+
+    c.putscript(script_name, new_content)
+
+
+if __name__ == '__main__':
+    main()