--- a/t.py Sun Oct 03 18:44:13 2010 -0400
+++ b/t.py Sun Oct 03 18:45:43 2010 -0400
@@ -18,37 +18,35 @@
def __init__(self, prefix):
super(AmbiguousPrefix, self).__init__()
self.prefix = prefix
-
class UnknownPrefix(Exception):
"""Raised when trying to use a prefix that does not match any tasks."""
def __init__(self, prefix):
super(UnknownPrefix, self).__init__()
self.prefix = prefix
-
def _hash(text):
"""Return a hash of the given text for use as an id.
-
+
Currently SHA1 hashing is used. It should be plenty for our purposes.
-
+
"""
return hashlib.sha1(text).hexdigest()
def _task_from_taskline(taskline):
"""Parse a taskline (from a task file) and return a task.
-
+
A taskline should be in the format:
-
+
summary text ... | meta1:meta1_value,meta2:meta2_value,...
-
+
The task returned will be a dictionary such as:
-
+
{ 'id': <hash id>,
'text': <summary text>,
... other metadata ... }
-
+
A taskline can also consist of only summary text, in which case the id
and other metadata will be generated when the line is read. This is
supported to enable editing of the taskfile with a simple text editor.
@@ -66,23 +64,23 @@
def _tasklines_from_tasks(tasks):
"""Parse a list of tasks into tasklines suitable for writing."""
-
+
tasklines = []
tlen = max(map(lambda t: len(t['text']), tasks)) if tasks else 0
-
+
for task in tasks:
meta = [m for m in task.items() if m[0] != 'text']
meta_str = ', '.join('%s:%s' % m for m in meta)
tasklines.append('%s | %s\n' % (task['text'].ljust(tlen), meta_str))
-
+
return tasklines
def _prefixes(ids):
"""Return a mapping of ids to prefixes in O(n) time.
-
+
Each prefix will be the shortest possible substring of the ID that
can uniquely identify it among the given group of IDs.
-
+
If an ID of one task is entirely a substring of another task's ID, the
entire ID will be the prefix.
"""
@@ -118,10 +116,10 @@
class TaskDict(object):
"""A set of tasks, both finished and unfinished, for a given list.
-
+
The list's files are read from disk when the TaskDict is initialized. They
can be written back out to disk with the write() function.
-
+
"""
def __init__(self, taskdir='.', name='tasks'):
"""Initialize by reading the task files, if they exist."""
@@ -140,15 +138,15 @@
tasks = map(_task_from_taskline, tls)
for task in tasks:
getattr(self, kind)[task['id']] = task
-
+
def __getitem__(self, prefix):
"""Return the unfinished task with the given prefix.
-
+
If more than one task matches the prefix an AmbiguousPrefix exception
will be raised, unless the prefix is the entire ID of one task.
-
+
If no tasks match the prefix an UnknownPrefix exception will be raised.
-
+
"""
matched = filter(lambda tid: tid.startswith(prefix), self.tasks.keys())
if len(matched) == 1:
@@ -161,55 +159,55 @@
return self.tasks[matched[0]]
else:
raise AmbiguousPrefix(prefix)
-
+
def add_task(self, text):
"""Add a new, unfinished task with the given summary text."""
task_id = _hash(text)
self.tasks[task_id] = {'id': task_id, 'text': text}
-
+
def edit_task(self, prefix, text):
"""Edit the task with the given prefix.
-
+
If more than one task matches the prefix an AmbiguousPrefix exception
will be raised, unless the prefix is the entire ID of one task.
-
+
If no tasks match the prefix an UnknownPrefix exception will be raised.
-
+
"""
task = self[prefix]
if text.startswith('s/') or text.startswith('/'):
text = re.sub('^s?/', '', text).rstrip('/')
find, _, repl = text.partition('/')
text = re.sub(find, repl, task['text'])
-
+
task['text'] = text
-
+
def finish_task(self, prefix):
"""Mark the task with the given prefix as finished.
-
+
If more than one task matches the prefix an AmbiguousPrefix exception
will be raised, if no tasks match it an UnknownPrefix exception will
be raised.
-
+
"""
task = self.tasks.pop(self[prefix]['id'])
self.done[task['id']] = task
-
+
def print_list(self, kind='tasks', verbose=False, quiet=False, grep=''):
"""Print out a nicely formatted list of unfinished tasks."""
tasks = dict(getattr(self, kind).items())
label = 'prefix' if not verbose else 'id'
-
+
if not verbose:
for task_id, prefix in _prefixes(tasks).items():
tasks[task_id]['prefix'] = prefix
-
+
plen = max(map(lambda t: len(t[label]), tasks.values())) if tasks else 0
for task in tasks.values():
if grep.lower() in task['text'].lower():
p = '%s - ' % task[label].ljust(plen) if not quiet else ''
print p + task['text']
-
+
def write(self, delete_if_empty=False):
"""Flush the finished and unfinished tasks to the files on disk."""
filemap = (('tasks', self.name), ('done', '.%s.done' % self.name))
@@ -224,14 +222,13 @@
tfile.write(taskline)
elif not tasks and os.path.isfile(path):
os.remove(path)
-
def _build_parser():
"""Return a parser for the command-line interface."""
usage = "Usage: %prog [-d DIR] [-l LIST] [options] [TEXT]"
parser = OptionParser(usage=usage)
-
+
actions = OptionGroup(parser, "Actions",
"If no actions are specified the TEXT will be added as a new task.")
actions.add_option("-e", "--edit", dest="edit", default="",
@@ -239,7 +236,7 @@
actions.add_option("-f", "--finish", dest="finish",
help="mark TASK as finished", metavar="TASK")
parser.add_option_group(actions)
-
+
config = OptionGroup(parser, "Configuration Options")
config.add_option("-l", "--list", dest="name", default="tasks",
help="work on LIST", metavar="LIST")
@@ -249,7 +246,7 @@
action="store_true", dest="delete", default=False,
help="delete the task file if it becomes empty")
parser.add_option_group(config)
-
+
output = OptionGroup(parser, "Output Options")
output.add_option("-g", "--grep", dest="grep", default='',
help="print only tasks that contain WORD", metavar="WORD")
@@ -260,16 +257,16 @@
action="store_true", dest="quiet", default=False,
help="print less detailed output (no task ids, etc)")
parser.add_option_group(output)
-
+
return parser
def _main():
"""Run the command-line interface."""
(options, args) = _build_parser().parse_args()
-
+
td = TaskDict(taskdir=options.taskdir, name=options.name)
text = ' '.join(args).strip()
-
+
try:
if options.finish:
td.finish_task(options.finish)