Topydo

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* Fix: fix a reported string incompatibility with Python 3.9.
* Fix: make all internal tests pass.
* Change: report the new repository home.

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* New: make the text editor configurable. It can be specified in the
configuration file or the editor can be passed with `topydo edit -E nano`.
This makes it also much easier to introduce 'filters', to process (a selection
of) todo items through an external command.
* New: with `revert ls` you can list all backups, with `revert NUM` you can
restore backup NUM (thanks to mruwek).
* New: tab-completion in column mode (thanks to mruwek).
* New: the commandline in column mode understands basic readline shortcuts:
- Ctrl-a: move cursor to the beginning
- Ctrl-e: move cursor to the end
- Ctrl-u: delete from the cursor back to the beginning
- Ctrl-k: delete from the cursor to the end

(thanks to mruwek).
* New: 'Mark all' in column mode: simply use Ctrl-A (thanks to mruwek).
* New list format specifiers (for `ls -F`):
- %n: line number
- %N: padded line number
- %u: text-based ID
- %U: padded text-based ID

The identifiers %i and %I print whatever is configured (default: line
numbers).
* New: `dep ls` was extended to understand the words `before` and `after`. For
example `topydo dep ls before 1` is equivalent to `topydo dep ls 1 to`
(thanks to mruwek).
* New: introduce 'identifier_alphabet' option in the configuration, allowing
you to choose which characters should be used for the text-based identifiers.
This is a convenience for Dvorak typists (like me), to only use characters on
the base row (and other conveniently positioned characters).

* Fix: crash when running `help` in column mode.
* Fix: better handling of incorrect dates. The `postpone` command would crash
when a todo item has an invalid due date (e.g. 2016-06-31).
* Fix: take hide tags into account in column mode.
* Fix: print the correct todo IDs in the `do` or `del` output (thanks to
mruwek).
* Fix: make `add -f` more robust when the file does not exist (thanks to
mruwek).
* Fix: `ls -n` would not print anything under some circumstances, e.g. when
todos are hidden.
* Fix: Do not apply ordinal filtering (<, >, =) when a tag appears more than
once.
* Fix: crash when launching column mode in Windows. This mode is not supported,
you may use Cygwin instead.
* Fix: crash when an option appears twice in the configuration file. The
last value for an option will be used (thanks to mruwek).
* Fix: fix padding for todo IDs.
* Fix: instruct users to use 'pip3' instead of 'pip' (thanks to mruwek).

* Change: `tag`, `append` and `dep` can work with multiple todo IDs. This
allows you to apply these commands on all marked items. Use {} as a
placeholder for the multiple IDs, e.g. `tag {} due today` (thanks to
mruwek).
* Change: completed items have a grey progress color.
* Change: show group names with relative (humanized) dates when they represent
dates.
* Change: print empty output when `dep ls` has no output. Improves feedback to
user in column mode (thanks to mruwek).
* Change: show an error message when parsing the list format fails (thanks to
mruwek).
* Change: use filter expression when no title was given for a column in the
column definition file (thanks to mruwek).
* Change: Ctrl-C does not abort column mode anymore, use :quit or :exit
instead.

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* New: The `tag` subcommand understands relative dates with the `-r` flag:
`tag -r foo value` will interpret value as a relative date and convert to an
absolute date.

* Fix: escape special characters in Dot output.
* Fix: when deleting the last column in column mode, no new columns could be
added. This is fixed by showing the column definition view to add a new
column.

* Change: output in column UI remains visible when : is pressed (instead of
Enter or Escape to discard).

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* New: `ls` can group items with the `-g` flag, accepting a group expression
(which has the same format as a sort expression). To group items by project,
run: `topydo ls -g project`.
* New: `ls` can print todo items in the Graphviz Dot format, such that
dependencies can be visualized. Use `ls -f dot`, or
`topydo ls -f dot +ProjectA | dot -Tsvg -o projectA.svg` to make a graph for
project A.
* New: Focus and mark colors are customizable in the column UI (thanks to
colinsullivan).
* New: todo items can be hidden by adding a `h:1` tag (thanks to MinchinWeb).
* New: an alternative column definition file can be given with the `-l` flag:
`topydo columns -l /path/to/columns.conf` (thanks to mruwek).

* Fix: column UI reloads automatically when the todo.txt file was changed
externally.
* Fix: `edit` did not work on some operating systems (e.g. Mac OS X).
* Fix: relative dates were sometimes one day off.
* Fix: Minor importance calculation fix during the weekend for distant mondays
(thanks to aetherknight).
* Fix: completed items are displayed correctly in the column UI.
* Fix: tests were made more deterministic.

* Change: Performance improvements for the column UI, it scales better with
large todo lists.
* Change: temporary files (for editing) will be detected as todo.txt files by
the todo.txt-vim plugin.

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* Fix: items without priority are shown in the console of the Column UI.

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A major release, introducing a new user interface (TUI). Special thanks go to
mruwek for helping out to get this UI in its current shape.

* New: A column-based user interface. Each column has its own filters and sort
order, allowing you to build a dashboard with your todo items. Launch with
`topydo columns`.
* New: color blocks that change from green to red (overdue) as time passes by.
Use the %z placeholder to add color blocks to the `ls` output.
* New: color option can be set to 0, 1, 16 or 256 and if needed overridden by
-C on the commandline.
* New: recurrence based on business days. Skips Saturdays and Sundays when
calculating the next date (thanks to mruwek).
* New: items can be sorted by length (use 'length' as sort field).
* New: parents-of and children-of operators with `add`, `dep` and `append`
subcommands. The todo item receives the same parents/children from the
specified todo item.
* New: `append` understands relative dates and other tags that are special to
`add` (thanks to rameshg87).

* Fix: dependency ID creation with orphan todo items.
* Fix: crash after completing/deleting an edited item.
* Fix: crash after completing an item that got a new dependency with `dep add`
* Fix: crash when archive filename is empty (fixed by mruwek).

* Change: a new tag value with an existing key can be added with the tag
subcommand (thanks to MinchinWeb)
* Change: ~/.config/topydo/config can be used as a configuration file.
* Change: No backups are written for read-only commands (e.g. lsprj)
* Change: topydo is more scalable for large todo.txt files.

* Known issue: color blocks are not shown in `ls` output in the column UI.

* Misc: topydo also has its own website at topydo.org. All commands and
features are documented there.