Merge pull request #3747 from urbit/lf/remove-channel-generator

metadata-store: add |remove generator

pkg/arvo/gen/metadata-store/remove.hoon

@@ -0,0 +1,20 @@
+::  :metadata-store|remove: remove resource from group
+::  Usage:
+::  :metadata-store|remove
+::    <group-name> <app-name> <channel-path> 
+::    %urbit-community %chat /~darrux-landes/general-503
+::
+::  You can acquire the channel-path with 
+::  :metadata-store +dbug [%state '(~(got by group-indices) <group-path>)'
+::  and looking for the entry with an app-path that is similar to the
+::  title of the channel
+::  
+/-  *metadata-store
+/+  resource
+:-  %say
+|=  $:  [now=@da eny=@uvJ =beak]
+        [[group=term app=term =path ~] ~]
+    ==
+:-  %metadata-action
+^-  metadata-action
+[%remove (en-path:resource [p.beak group]) app path]