urbit/pkg/arvo/gen/hood/story-remove.hoon

::  story: Remove any commit message(s) for a given desk, optionally targeting a specific case or prose
::
::::
  ::
/-  *story
:-  %say
|=  $:  [now=@da eny=@uvJ bec=beak]
        [[=desk ~] cas=cash prz=prose ~]
    ==
::
::  XX: story set and story init both have desk and case as optional.
::      however, it seems a bit odd to allow both optional here
::      since we're dealing with a more hazardous operation.
::      should we allow a bare `|story-remove` to remove the last commit message on the current desk?
::      leaning towards no, and potentially even making the case non-optional
=/  our                p.bec
=?  cas  =(*case cas)  r.bec  :: use case from beak if cas not provided
?:  !.^(? %cs /(scot %p our)/[desk]/(scot cas)/case)
  ~&  >>  "Error: invalid case {<cas>} provided"
  helm-pass+[%d %noop ~]
=/  tak
  ?:  ?=([%tako tako:clay] cas)
    p.cas
  .^(tako:clay %cs /(scot %p our)/[desk]/(scot cas)/tako/~)
::
=/  pax            /(scot %p our)/[desk]/(scot %da now)/story
?:  !.^(? %cu pax)
  ~&  >>  "Error: desk {<desk>} does not exist."
  helm-pass+[%d %noop ~]
=/  tale=story     .^(story %cx pax)
=.  tale
  ?:  =(*prose prz)
    (~(del by tale) tak)
  (~(del ju tale) tak prz)
:-  %helm-pass
[%c [%info desk %& [/story %ins story+!>(tale)]~]]