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Command line python front end to ics calendar

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# icalcli

### An iCalendar Command Line Interface

`icalcli` - a modification of [gcalcli](https://github.com/insanum/gcalcli) - is a Python command line front-end to your Calendar. It allows you to get your agenda, view weekly and monthly calendars (ascii text graphical calendar), search for events, add new events, delete events, and edit events.

Unlike [gcalcli](https://github.com/insanum/gcalcli) which is tied to Google Calendar, `icalcli` is agnostic to (abstracts away from) the actual backend calendar service. It relies on a backend interface which interacts with the backend calendar to perform all the CRUD (Create, Retrieve, Update and Delete) operations on the actual calendar. The package includes two backends:

* The `etesync_backend` subpackage provides a backend interface to the [EteSync](https://www.etesync.com/) calendar (versions 1.0 and 2.0). In fact, `icalcli` was created primarily to provide a command line interface to my self hosted `EteSync` calendar.

* The `file_backend` subpackage provides a backend interface to a calendar contained in a local `ics` file. This is useful as a viewer/editor of `ics` files. It is also useful to try out `icalci` without having any other backend configured.

The two included backends would also be useful to those who wish to write their own backend interfaces. `icalcli` requires the calendar to be presented to it as a list of [icalendar](https://github.com/collective/icalendar) events (`VEVENT`). It is the responsibility of the backend interface to read the actual calendar and create this list of events. It must also perform all the CRUD (Create, Retrieve, Update and Delete) operations on the actual calendar.

## Requirements

* [Python](http://www.python.org) (3+)
* [dateutil](http://www.labix.org/python-dateutil)
* [parsedatetime](https://github.com/bear/parsedatetime)
* [icalendar](https://github.com/collective/icalendar)
* A love for the command line!

### Optional packages

* [pyetesync](https://github.com/etesync/pyetesync) the python client library for `EteSync` if you want to use the `EteSync` backend.

## Installation

### Install from PyPI

```sh
pip install icalcli
```

or via `pipx`:

```sh
pipx install icalcli
```

### Install from source

```sh
git clone https://github.com/jrvarma/icalcli.git
cd icalcli
python -m pip install .
```

or via `pipx`:

```sh
pipx install . --editable
```

## Usage

### Command line arguments

`icalcli` provides a series of subcommands with the following functionality:

edit (e)               edit calendar events
    agenda (g)             get an agenda for a time period
    calw (w)               get a week-based agenda in calendar format
    cal5w (5w)             get this week / 2 past / 2 future weeks agenda in calendar format
    calm (m)               get a month agenda in calendar format
    add (a)                add a detailed event to the calendar
    search (s)             (regex) search for events 
    sync (y)               sync the backend calendar
    quit (q)               quit icalcli

By default, `icalcli` runs interactively as an REPL (Read Evaluate Print Loop). Run `icalcli --help` for more details. `icalcli <subcommand> --help` gives help on each subcommand.

### Configuration Script

In the beginning, `icalcli` executes a configuration script which is expected to create the object `backend_interface` representing the backend interface initialized with the right authentication credentials to access the backend calendar. The configuration script is located, by default, at `~/.icalcli.py`, but this can be changed with the `-c` option.

#### Example configuration for file_backend

```
from icalcli import ICSInterface

backend_interface = ICSInterface("/path/to/ics-file")

```

#### Example configuration for multiple readonly file_backend

```
from icalcli import ICSInterface

backend_interface = ICSInterface(["/path/to/ics-file-1", "/path/to/ics-file-2"])

```

#### Example configuration for etesync_backend (etesync 1.0)

This configuration assumes that all the credentials are stored in a plain text (`json`) file. In practice, you would use a more secure storage (perhaps, the `Gnome keyring`) or just read it from the terminal.

```
from icalcli import EtesyncInterface
import base64
import json

conf_file = '/path/to/json-file'
with open(conf_file, 'r') as fp:
    c = json.load(fp)
backend_interface = EtesyncInterface(
    c['email'], c['userPassword'], c['remoteUrl'],
    c['uid'], c['authToken'],
    base64.decodebytes(c['cipher_key'].encode('ascii')))
```
See the [Example code](https://github.com/jrvarma/icalcli/issues/1#issuecomment-979851222) for getting the  `uid` and `authToken` for the `etesync` calendar.

#### Example configuration for etebase_backend (etesync 2.0)

```
from icalcli import EtebaseInterface
import json

conf_file = '/path/to/json-file'
with open(conf_file, 'r') as fp:
    c = json.load(fp)

backend_interface = EtebaseInterface(c['user'], c['server_url'], c['password'],
                                     c['calendar_uid'], silent=False)
```

The `calendar_uid` can be obtained using the following code. This code assumes that the `dict c` has been populated with the credentials from the `json` file as above.

```
from etebase import Client, Account, FetchOptions

client = Client(c['user'], c['server_url'])
etebase = Account.login(client, c['user'], c['password'])
col_mgr = etebase.get_collection_manager()
print({col.uid: col.meta
      for col in col_mgr.list("etebase.vevent").data})
```

## Recurring events and default search period

`icalcli` understands the `RRULE`, `RDATE`, `EXRULE`, `EXDATE` elements of the `icalendar` specification. These elements can be added while creating or editing events using `--rrule`, `--rdate`, `--exrule` and `--exdate` options.

In most views, the instances of the recurring event are displayed. Since a recurring event can have an unlimited number of instances, searches with no start or end date can produce an unending series of events. By default therefore searches with no start or end date are limited to the previous five years and following five years. These defaults can be changed using the options ` --default_past_years` and `--default_future_years`

## Raw ICS

The `icalendar` specification is quite large and complex, and `icalcli` implements only the most common parts of this specification. It is possible to use the `--raw_ics` option to create/edit event using raw ICS text.

## Screenshots

Some screenshots are available at Github:

#### Agenda and Week Views

![Agenda and Week Views](https://github.com/jrvarma/icalcli/raw/master/screenshots/icalci-0-agenda-week-views.png)

#### Adding an event

![Adding an event](https://github.com/jrvarma/icalcli/raw/master/screenshots/icalci-1-add-event.png)

#### Searching and editing events

![Searching and editing events](https://github.com/jrvarma/icalcli/raw/master/screenshots/icalci-2-search-edit-event.png)

#### Multi-day events

![Multi-day events](https://github.com/jrvarma/icalcli/raw/master/screenshots/icalci-3-multi-day-event.png)

#### Month View

![Month View](https://github.com/jrvarma/icalcli/raw/master/screenshots/icalci-4-month-view.png)

icalcli

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