taskopen workaround support for macOS

The management of installed Perl modules (1) on macOS is not as simple
and well thought through like with package managers on Linux systems,
e.g. via pacman (2) on Arch Linux (3). There are problems when
is comes to configuring the runtime path the modules have been installed
to even when using the most popular module manager called cpanminus (4).
This causes the Taskwarrior (5) plugin taskopen (6) fail to load because
the Perl core module `JSON` can't be found and loaded.

As a workaround a custom script has been implemented to create and open
a attached note of an task:

1. Used the `_get` (7) function of the Taskwarrior DOM
   API (8) to extract any stored piece of information of an task. This
   allows to receive the UUID of an task (9).
2. Created a custom `on` (open note) Taskwarrior alias (10) to run the
   implemented custom script via the `execute` command.

The logic of the script follows the same like taskopen uses for default
notes:

* Using the UUID of an task (TODO) as the note filename.
* Simply passing the file to an editor (in this case Atom (11)) which
  will…
    * …creates a new file if it doesn't exist yet.
    * …opens the file if it already exists.

Note that this script is not limited to macOS but can also be used for
any other Linux hosts!

References:

  (1) http://www.cpan.org/modules
  (2) https://wiki.archlinux.org/index.php/Pacman
  (3) https://archlinux.org
  (4) https://github.com/miyagawa/cpanminus
  (5) https://taskwarrior.org
  (6) https://github.com/ValiValpas/taskopen
  (7) https://taskwarrior.org/docs/commands/_get.html
  (8) https://taskwarrior.org/docs/dom.html
  (9) https://taskwarrior.org/docs/ids.html
  (10) https://taskwarrior.org/docs/terminology.html#alias
  (11) https://atom.io

Epic: #131
Related to #110
Closes GH-134

snowblocks/taskwarrior/README.md

@@ -0,0 +1,45 @@
+# Taskwarrior
+
+> Taskwarrior is a flexible, fast, and unobtrusive CLI tool to manage your TODOs that does its job and gets out of your way.
+
+## Extensions
+
+### taskopen
+
+The [taskopen][] extension allows to take notes and open URLs with attached to Taskwarrior tasks.
+
+Next to the `task` binary itself, this Perl script depends on the `JSON` module which can be installed on Arch Linux via the [perl-json][arch-perl-json] package.
+
+## Troubleshooting
+
+### taskopen workaround for macOS
+
+The management of installed [Perl modules][cpan-doc-modules] on macOS is not as simple and well thought through like with package managers on Linux systems, e.g. via [pacman][archw-pacman] on [Arch Linux][archlinux]. There are problems when is comes to configuring the runtime path the modules have been installed to even when using the most popular module manager called [cpanminus][].
+This causes the [Taskwarrior][] plugin [taskopen][] fail to load because the Perl core module `JSON` can't be found and loaded.
+
+As a workaround a custom script can be implemented to create and open an attached task note:
+
+1. Use the [`_get`][tw-doc-api-_get] function of the [Taskwarrior DOM API][tw-doc-dom-api] to extract any stored piece of information of an task. This allows to receive the [UUID of an task][tw-doc-ids].
+2. Create a custom `on` (open note) [Taskwarrior alias][tw-doc-alias] to run the implemented custom script via the `execute` command.
+
+The logic of the script follows the same like taskopen uses for default notes:
+
+* Use the [UUID of an task][tw-doc-ids] as the note filename.
+* Simply pass the file to an editor (in this case [Atom][]) which will…
+  * …create a new file if it doesn't exist yet.
+  * …open the file if it already exists.
+
+Note that **this script is not limited to macOS** but can also be used for any other Linux host!
+
+[archlinux]: https://archlinux.org
+[arch-perl-json]: https://www.archlinux.org/packages/community/any/perl-json
+[archw-pacman]: https://wiki.archlinux.org/index.php/Pacman
+[atom]: https://atom.io
+[cpanminus]: https://github.com/miyagawa/cpanminus
+[cpan-doc-modules]: http://www.cpan.org/modules
+[taskopen]: https://github.com/ValiValpas/taskopen
+[taskwarrior]: https://taskwarrior.org
+[tw-doc-alias]: https://taskwarrior.org/docs/terminology.html#alias
+[tw-doc-api-_get]: https://taskwarrior.org/docs/commands/_get.html
+[tw-doc-dom-api]: https://taskwarrior.org/docs/dom.html
+[tw-doc-ids]: https://taskwarrior.org/docs/ids.html

snowblocks/taskwarrior/scripts/open-note.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2016-present Arctic Ice Studio <development@arcticicestudio.com>
+# Copyright (C) 2016-present Sven Greb <development@svengreb.de>
+
+# 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(1)
+#   https://en.wikibooks.org/wiki/Regular_Expressions/POSIX-Extended_Regular_Expressions
+
+set -e
+
+cleanup() {
+  unset -f log_error validate_parameter get_task_uuid open_notes
+}
+
+log_error() {
+  printf "\e[31m%s\e[0m\n" "✖ $*" 1>&2
+}
+
+validate_parameter() {
+  if [ $# -eq 0 ]; then
+    log_error "No task IDs specified!"
+    exit 1
+  fi
+
+  local VALID_NUMBER_REGEX="^[0-9]+$"
+  if ! [[ $1 =~ $VALID_NUMBER_REGEX ]]; then
+    log_error "Invalid parameter '$1': parameters must be of type number!"
+    exit 1
+  fi
+}
+
+get_task_uuid() {
+  local task_id=$1
+  local uuid="$(task _get $task_id.uuid)"
+  if [ -z $uuid ]; then
+    log_error "No task found with for specified ID '$task_id'!"
+    exit 1
+  fi
+  printf "$uuid"
+}
+
+open_notes() {
+  declare -a local task_uuids
+  local task_uuid
+  local note_path="~/.task/notes"
+  local editor_cmd="atom -a"
+  local note_file_ext="md"
+
+  for task_id in $@; do
+    validate_parameter $task_id
+    task_uuid="$(get_task_uuid $task_id)"
+    if ! [ -z $task_uuid ]; then
+      $editor_cmd "$note_path/$task_uuid.$note_file_ext"
+    fi
+  done
+}
+
+trap 'printf "User aborted.\n" && exit 1' SIGINT SIGTERM
+trap cleanup EXIT
+
+open_notes $@
+exit 0

snowblocks/taskwarrior/snowblock.json

@@ -38,6 +38,11 @@
         "create": true,
         "force": true,
         "path": "hooks/on-modify-track-total-active-time.py"
+      },
+      "~/.task/scripts/open-note.sh": {
+        "create": true,
+        "force": true,
+        "path": "scripts/open-note.sh"
       }
     }
   }

snowblocks/taskwarrior/taskrc

@@ -88,3 +88,4 @@ alias.e=edit
 alias.ls=list
 alias.mod=modify
 alias.o=execute taskopen
+alias.on=execute "$HOME/.task/scripts/open-note.sh"