--- /dev/null
+#compdef task
+# zsh completion for taskwarrior
+#
+# taskwarrior - a command line task list manager.
+#
+# Copyright 2010 - 2011 Johannes Schlatow
+# Copyright 2009 P.C. Shyamshankar
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+# http://www.opensource.org/licenses/mit-license.php
+#
+typeset -g _task_cmds _task_projects _task_tags _task_config _task_modifiers
+_task_projects=($(task _projects))
+_task_tags=($(task _tags))
+_task_ids=($(task _ids))
+_task_config=($(task _config))
+_task_columns=($(task _columns))
+_task_modifiers=(
+ 'before' \
+ 'after' \
+ 'none' \
+ 'any' \
+ 'is' \
+ 'isnt' \
+ 'has' \
+ 'hasnt' \
+ 'startswith' \
+ 'endswith' \
+ 'word' \
+ 'noword'
+)
+_task_conjunctions=(
+ 'and' \
+ 'or' \
+ 'xor' \
+ '\)'
+ '\('
+)
+_task_cmds=($(task _commands))
+_task_zshcmds=( ${(f)"$(task _zshcommands)"} )
+
+_task() {
+ _arguments -s -S \
+ "*::task default:_task_default"
+ return 0
+}
+
+local -a reply args word
+word=$'[^\0]#\0'
+
+# priorities
+local -a task_priorities
+_regex_words values 'task priorities' \
+ 'H:High' \
+ 'M:Middle' \
+ 'L:Low'
+task_priorities=("$reply[@]")
+
+# projects
+local -a task_projects
+task_projects=(
+ /"$word"/
+ ":values:task projects:compadd -a _task_projects"
+)
+
+local -a _task_dates
+_regex_words values 'task dates' \
+ 'tod*ay:Today' \
+ 'yes*terday:Yesterday' \
+ 'tom*orrow:Tomorrow' \
+ 'sow:Start of week' \
+ 'soww:Start of work week' \
+ 'socw:Start of calendar week' \
+ 'som:Start of month' \
+ 'soy:Start of year' \
+ 'eow:End of week' \
+ 'eoww:End of work week' \
+ 'eocw:End of calendar week' \
+ 'eom:End of month' \
+ 'eoy:End of year' \
+ 'mon:Monday' \
+ 'tue:Tuesday'\
+ 'wed:Wednesday' \
+ 'thu:Thursday' \
+ 'fri:Friday' \
+ 'sat:Saturday' \
+ 'sun:Sunday'
+_task_dates=("$reply[@]")
+
+local -a _task_reldates
+_regex_words values 'task reldates' \
+ 'hrs:n hours' \
+ 'day:n days' \
+ '1st:first' \
+ '2nd:second' \
+ '3rd:third' \
+ 'th:4th, 5th, etc.' \
+ 'wks:weeks'
+_task_reldates=("$reply[@]")
+
+task_dates=(
+ \( "$_task_dates[@]" \|
+ \( /$'[0-9][0-9]#'/- \( "$_task_reldates[@]" \) \)
+ \)
+)
+
+_regex_words values 'task frequencies' \
+ 'daily:Every day' \
+ 'day:Every day' \
+ 'weekdays:Every day skipping weekend days' \
+ 'weekly:Every week' \
+ 'biweekly:Every two weeks' \
+ 'fortnight:Every two weeks' \
++ 'monthly:Every month' \
+ 'quarterly:Every three months' \
+ 'semiannual:Every six months' \
+ 'annual:Every year' \
+ 'yearly:Every year' \
+ 'biannual:Every two years' \
+ 'biyearly:Every two years'
+_task_freqs=("$reply[@]")
+
+local -a _task_frequencies
+_regex_words values 'task frequencies' \
+ 'd:days' \
+ 'w:weeks' \
+ 'q:quarters' \
+ 'y:years'
+_task_frequencies=("$reply[@]")
+
+task_freqs=(
+ \( "$_task_freqs[@]" \|
+ \( /$'[0-9][0-9]#'/- \( "$_task_frequencies[@]" \) \)
+ \)
+)
+
+# attributes
+local -a task_attributes
+_regex_words -t ':' default 'task attributes' \
+ 'pro*ject:Project name:$task_projects' \
+ 'du*e:Due date:$task_dates' \
+ 'wa*it:Date until task becomes pending:$task_dates' \
+ 're*cur:Recurrence frequency:$task_freqs' \
+ 'pri*ority:priority:$task_priorities' \
+ 'un*til:Recurrence end date:$task_dates' \
+ 'fg:Foreground color' \
+ 'bg:Background color' \
+ 'li*mit:Desired number of rows in report'
+task_attributes=("$reply[@]")
+
+args=(
+ \( "$task_attributes[@]" \|
+ \( /'(project|due|wait|recur|priority|until|fg|bg|limit).'/- \( /$'[^:]#:'/ ":default:modifiers:compadd -S ':' -a _task_modifiers" \) \) \|
+ \( /'(rc).'/- \( /$'[^:]#:'/ ":arguments:config:compadd -S ':' -a _task_config" \) \) \|
+ \( /'(+|-)'/- \( /"$word"/ ":values:remove tag:compadd -a _task_tags" \) \) \|
+ \( /"$word"/ \)
+ \) \#
+)
+_regex_arguments _task_attributes "${args[@]}"
+
+## task commands
+
+# filter completion
+(( $+functions[_task_filter] )) ||
+_task_filter() {
+ _task_attributes "$@"
+
+ # TODO complete conjunctions only if the previous word is a filter expression, i.e. attribute, ID, any non-command
+ _describe -t default 'task conjunctions' _task_conjunctions
+}
+
+# merge completion
+(( $+functions[_task_merge] )) ||
+_task_merge() {
+ # TODO match URIs in .taskrc
+ _files
+}
+
+# push completion
+(( $+functions[_task_push] )) ||
+_task_push() {
+ # TODO match URIs in .taskrc
+ _files
+}
+
+# pull completion
+(( $+functions[_task_pull] )) ||
+_task_pull() {
+ # TODO match URIs in .taskrc
+ _files
+}
+
+# execute completion
+(( $+functions[_task_execute] )) ||
+_task_execute() {
+ _files
+}
+
+# id-only completion
+(( $+functions[_task_id] )) ||
+_task_id() {
+ _describe -t values 'task IDs' _task_zshids
+}
+
+## first level completion => task sub-command completion
+(( $+functions[_task_default] )) ||
+_task_default() {
+ local cmd ret=1
+
+ integer i=1
+ while (( i < $#words ))
+ do
+ cmd="${_task_cmds[(r)$words[$i]]}"
+ if (( $#cmd )); then
+ _call_function ret _task_${cmd} ||
+ _call_function ret _task_filter ||
+ _message "No command remaining."
+ return ret
+ fi
+ (( i++ ))
+ done
+
+ # update IDs
+ _task_zshids=( ${(f)"$(task _zshids)"} )
+
+ _describe -t commands 'task command' _task_zshcmds
+ _describe -t values 'task IDs' _task_zshids
+ _call_function ret _task_filter
+
+ return ret
+}
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