Taskwarrior tab completion for the fish shell

Signed-off-by: Paul Beckingham <paul@beckingham.net>

AUTHORS

@@ -25,6 +25,7 @@ The following submitted code, packages or analysis, and deserve special thanks:
   Michal Josífko
   Ed Neville
   Kevin Owens
+  Mick Koch
 
 Thanks to the following, who submitted detailed bug reports and excellent suggestions:
   Eugene Kramer

ChangeLog

@@ -32,6 +32,7 @@
  + Special tags 'nocal', 'nocolor' and 'nonag' are implemented.
  + The 'tags' command highlights special tags.
  + The 'stats' and 'info' reports not obey color.alternate.
+ + New fish shell tab completion script (thanks to Mick Koch).
  + Fixed bug #427, preventing the task edit command to parse annotation
    dates with spaces.
  + Fixed bug #433, making task command output more consistent.

scripts/fish/task.fish

@@ -0,0 +1,138 @@
+# Task <http://taskwarrior.org> tab completions for the Fish shell
+# <http://fishshell.org>.
+#
+# Copy this script to ~/.config/fish/completions/task.fish, open a new shell,
+# and enjoy.
+#
+# Objects completed:
+#  * Commands
+#  * Projects
+#  * Priorities
+#  * Tags
+#  * Attribute names and modifiers
+#
+# License:
+#  Copyright 2009 Mick Koch <kchmck@gmail.com>
+#
+#  This script is free software. It comes without any warranty, to the extent
+#  permitted by applicable law. You can redistribute it and/or modify it under
+#  the terms of the Do What The Fuck You Want To Public License, Version 2, as
+#  published by Sam Hocevar. See http://sam.zoy.org/wtfpl/COPYING for more
+#  details.
+
+function __fish.task.bare
+    test (count (commandline -c -o)) -eq 1
+end
+
+function __fish.task.complete
+    complete -c task -u $argv
+end
+
+function __fish.task.head
+    task _ids
+    task _commands
+end
+
+function __fish.task.attrs
+    echo project
+    echo priority
+    echo due
+    echo recur
+    echo until
+    echo limit
+    echo wait
+    echo rc
+end
+
+function __fish.task.mods
+    echo before
+    echo after
+    echo over
+    echo under
+    echo none
+    echo is
+    echo isnt
+    echo has
+    echo hasnt
+    echo startswith
+    echo endswith
+    echo word
+    echo noword
+end
+
+function __fish.task.combos
+    echo $argv[1]:$argv[2]
+
+    for mod in (__fish.task.mods)
+        echo $argv[1].$mod:$argv[2]
+    end
+end
+
+function __fish.task.combos.simple
+    __fish.task.combos $argv ""
+end
+
+function __fish.task.projects
+    __fish.task.combos.simple project
+
+    for project in (task _projects)
+        __fish.task.combos project $project
+    end
+end
+
+function __fish.task.priorities
+    __fish.task.combos.simple priority
+
+    for priority in H M L
+        __fish.task.combos priority $priority
+    end
+end
+
+function __fish.task.rc
+    echo rc:
+
+    for value in (task _config)
+        echo rc.$value:
+    end
+end
+
+function __fish.task.tags
+    for tag in (task _tags)
+        echo +$tag
+        echo -$tag
+    end
+end
+
+function __fish.task.match
+    __fish.task.attrs | grep \^(echo $argv | sed -E "s/(\w+).+/\1/")
+end
+
+function __fish.task.attr
+    for attr in (__fish.task.match $argv)
+        switch $attr
+            case project
+                __fish.task.projects
+            case priority
+                __fish.task.priorities
+            case rc
+                __fish.task.rc
+            case "*"
+                __fish.task.combos.simple $attr
+        end
+    end
+end
+
+function __fish.task.body
+    set token (commandline -ct)
+
+    if test -n $token
+        __fish.task.attr $token
+    else
+        __fish.task.attrs
+    end
+
+    __fish.task.tags
+end
+
+__fish.task.complete -f -n __fish.task.bare -a "(__fish.task.head)"
+__fish.task.complete -f -n "not __fish.task.bare" -a "(__fish.task.body)"