Add new snowblock for Taskwarrior

Create a new snowblock for Taskwarrior (1) including

* the "key=value" based `.taskrc` configuration (2) file
* a Nord (3) based color theme to be included in `.taskrc`

> Content

>> Context

The context (4) feature should be used to separate all public projects
and private/job related tasks.

>> UDA (User Defined Attributes)

The UDA (5) feature should be used to create custom attributes to add
a assignee, a estimation value and the GitHub issue ID to a task.

>> Reports

The reports (6) feature should be used to extend and optimize the task
output. The custom report should be set to `default.command` to replace
the default `next` report.

>> Aliases

The config should contain aliases to align with the alias workflow of
other snowblocks like bash and git. This improves the usability,
because there are several commands that start with the same characters
making it slower to be used with the auto completion.

* `a` ->  `add`
* `bd` ->  `burndown.daily`
* `cx` ->  `context`
* `e` ->  `edit`
* `ls` ->  `list`
* `mod` ->  `modify`

> Alternative workflows

The Taskwarrior workflow could be changed later on to use multiple
databases per use-case like e.g. one database per project to make
better use of the features like projects, tags and context with
finer grained filters.

> Configuration

>> Core Plugins

>>> `clean`

* `~`
* `~/.task`

>>> `link`

* "archbook":
  * `taskrc` -> `~/.taskrc`
  * `nord.theme` -> `~/.task/nord.theme`
* "igloo":
  * `taskrc` -> `~/.taskrc`
  * `nord.theme` -> `~/.task/nord.theme`

References:

  (3) https://arcticicestudio.github.io/nord
  (1) https://taskwarrior.org
  (2) https://taskwarrior.org/docs/introduction.html
  (4) https://taskwarrior.org/docs/context.html
  (5) https://taskwarrior.org/docs/udas.html
  (6) https://taskwarrior.org/docs/report.html

Closes GH-107

snowblocks/taskwarrior/nord.theme

@@ -0,0 +1,100 @@
+# Copyright (c) 2016-present Arctic Ice Studio <[email protected]>
+# Copyright (c) 2016-present Sven Greb <[email protected]>
+
+# Project:    igloo
+# Repository: https://github.com/arcticicestudio/igloo
+# License:    MIT
+# References:
+#   https://taskwarrior.org/docs/themes.html
+#   task-color(5)
+#   taskrc(5)
+
+rule.precedence.color=deleted,completed,active,keyword.,tag.,project.,overdue,scheduled,due.today,due,blocked,blocking,recurring,tagged,uda.
+
+#+---------+
+#+ General +
+#+---------+
+color.label=
+color.label.sort=
+color.alternate=
+color.header=bold blue
+color.footnote=cyan
+color.warning=bold black on yellow
+color.error=bold white on red
+color.debug=magenta
+
+#+-------------+
+#+ Task States +
+#+-------------+
+color.completed=green
+color.deleted=red
+color.active=bold black on cyan
+color.recurring=
+color.scheduled=white on black
+color.until=white on bright black
+color.blocked=yellow on black
+color.blocking=bold yellow on black
+
+#+----------+
+#+ Projects +
+#+----------+
+color.project.none=
+
+#+----------+
+#+ Priority +
+#+----------+
+color.uda.priority.H=bold cyan
+color.uda.priority.M=bold blue
+color.uda.priority.L=bold black
+
+#+------+
+#+ Tags +
+#+------+
+color.tag.next=
+color.tag.none=
+color.tagged=
+
+#+-----+
+#+ Due +
+#+-----+
+color.due=blue
+color.due.today=cyan on black
+color.overdue=bold red
+
+#+---------+
+#+ Reports +
+#+---------+
+color.burndown.done=bold black on cyan
+color.burndown.pending=black on bright cyan
+color.burndown.started=black on blue
+
+color.history.add=bold black on blue
+color.history.delete=bright white on bold black
+color.history.done=bold black on cyan
+
+color.summary.background=bright white on black
+color.summary.bar=black on cyan
+
+#+----------+
+#+ Calendar +
+#+----------+
+color.calendar.due=bold black on blue
+color.calendar.due.today=bold black on cyan
+color.calendar.holiday=bold blue on white
+color.calendar.overdue=white on red
+color.calendar.today=bold black on cyan
+color.calendar.weekend=bright white on bright black
+color.calendar.weeknumber=bold black
+
+#+-----------------+
+#+ Synchronization +
+#+-----------------+
+color.sync.added=green
+color.sync.changed=yellow
+color.sync.rejected=red
+
+#+------+
+#+ Undo +
+#+------+
+color.undo.after=green
+color.undo.before=red

snowblocks/taskwarrior/snowblock.json

@@ -0,0 +1,27 @@
+[
+  {
+    "clean": [
+      "~",
+      "~/.task"
+    ]
+  },
+  {
+    "link": {
+      "~/.taskrc": {
+        "force": true,
+        "hosts": {
+          "archbook": "taskrc",
+          "igloo": "taskrc"
+        }
+      },
+      "~/.task/nord.theme": {
+        "create": true,
+        "force": true,
+        "hosts": {
+          "archbook": "nord.theme",
+          "igloo": "nord.theme"
+        }
+      }
+    }
+  }
+]

snowblocks/taskwarrior/taskrc

@@ -0,0 +1,82 @@
+# Copyright (c) 2016-present Arctic Ice Studio <[email protected]>
+# Copyright (c) 2016-present Sven Greb <[email protected]>
+
+# Project:    igloo
+# Repository: https://github.com/arcticicestudio/igloo
+# License:    MIT
+# References:
+#   https://taskwarrior.org/docs
+#   https://taskwarrior.org/docs/terminology.html#regex
+#   taskrc(5)
+#   task-sync(5)
+#   https://en.wikibooks.org/wiki/Regular_Expressions/POSIX-Extended_Regular_Expressions
+
+#+------+
+#+ Core +
+#+------+
+data.location=~/.task
+
+complete.all.tags=true
+default.command=list
+editor=vim
+list.all.projects=true
+list.all.tags=true
+regex=true
+weekstart=Monday
+
+#+----+
+#+ UI +
+#+----+
+include ~/.task/nord.theme
+color=true
+
+#+---------+
+#+ Context +
+#+---------+
+context.aur=project:aur
+context.icecore=project:icecore
+context.icepick=project:icepick
+context.igloo=project:igloo
+context.job=+job
+context.lumio=project:lumio
+context.nord=project:nord
+context.northem=project:northem
+context.private=+private
+context.snowsaw=project:snowsaw
+context.styleguide=project:styleguide
+
+#+-----+
+#+ UDA +
+#+-----+
+uda.assignee.type=string
+uda.assignee.label=Assignee
+uda.assignee.values=arcticicestudio,svengreb,arcticfrostgaming,
+uda.assignee.default=
+
+uda.estimate.type=string
+uda.estimate.label=Size Estimate
+uda.estimate.values=huge,large,medium,small,trivial,
+uda.estimate.default=
+
+uda.ghi.type=numeric
+uda.ghi.label=GitHub Issue
+uda.ghi.default=
+
+#+---------+
+#+ Reports +
+#+---------+
+report.stat.description=Optimized and extended status report
+report.stat.columns=id,start.age,entry.age,depends.indicator,priority,project,tags,recur.indicator,scheduled,scheduled.relative,due,due.relative,until.remaining,description.count,urgency
+report.stat.labels=ID,Active,Age,D,P,Project,Tags,R,Sch,,Due,,Until,Desc,Urg
+report.stat.filter=status:pending
+report.stat.sort=start-,due+,project+,urgency-
+
+#+---------+
+#+ Aliases +
+#+---------+
+alias.a=add
+alias.bd=burndown.daily
+alias.cx=context
+alias.e=edit
+alias.ls=list
+alias.mod=modify