imag/doc/src/05100-lib-todo.md
Matthias Beyer de8e065eec doc: Rewrite docs for todo module parts
Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
2019-02-10 17:14:21 +01:00

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## libimagtodo
The library for the todo module which provides functionality to
implement/implements a todomanager in imag.
### Implementation details
One todo entry is stored as one imag entry. The ID of the imag entry is generated by
appending a unique ID (UUID) to "todo/".
The unique ID identifies the todo entry.
#### Stored data
A todo entry stores the following information:
* The (UU)ID of the todo entry
* A status of the todo entry. Valid values are: "deleted", "done", "pending"
* A "scheduled" date/datetime, can also yield an iterator
* An optional "hidden" value, which specifies a date in the future where this
todo entry should show up. Relative (eg. "-5days"),
to the "scheduled" date/datetime
* An optional "due" date/datetime, relative to the "scheduled" time
* A list of dependencies of the entry
* A "importance"-level, config file defined (strings in an array, index used for
ranking them)
* User defined value (a map of key-value string pairs)
The description of the todo entry is stored as plain text.
#### Data not stored
Some data is explicitely _not_ stored by the library because there are other
libraries fullfilling that purpose. These are:
* Tags, which can be done with libimagentrytag
* Category, which can be done with libimagentrycategory
* Project belonging, which can be done with libimagentrylink (by linking to a
project file - note that "project" is a domain not yet implemented by imag)
* Annotations, which can be stored with libimagentryannotation
#### Header format
The header partial for libimagtodo is as follows:
```
[todo]
uuid = "string"
status = "string"
scheduled = "<kairos time spec>"
hidden = "<kairos time func (optional)>"
due = "<kairos time func (optional)>"
depends = [ "list of uuids" ]
importance = "string"
uda = {}
```
#### Functionality
The provided functionality of this library includes, but is not limited to:
* Creating new todo entries in the store
* Deleting todo entries from the store
* get/retrieving todo entries from the store
* Turning an entry into a todo entry
* Getting todo details from an entry
* scheduled, due, waiting date/datetime
* priority
* UUID
* status
* An iterator over all dependend todo entries (as `StoreIdIterator`)
* Calculating a "urgency" of a todo entry from a formula weighted by configurable factors
#### Dependencies between tasks
Dependencies between todo entries are created by putting the UUID of a dependent todo entry into
the `todo.depends` header.
This way, a unidirectional link is created. A link (as in `libimagentrylink`) is
_also_ created, but this can be turned off explicitely.
As `libimagentrylink` links are bidirectional, they do not suffice for todo
entry dependency creation.
As todo entries are stored with the Store IDs "todo/<uuid>", creating a
`StoreId` from a UUID is trivial.