/-  *sole
::    a library for printing doccords
::
=/  debug  |
=>
  ::    types used by doccords
  |%
  ::    $overview: an overview of all named things in the type.
  ::
  ::  each element in the overview list is either a documentation for a sublist
  ::  or an association betwen a term and documentation for it
  +$  overview  (list overview-item)
  ::
  ::  $overview-item: an element of an overview
  +$  overview-item
    $%  [%header doc=what children=overview]
        [%item name=tape doc=what]
    ==
  ::
  ::  $item: the part of a type being inspected
  +$  item
    $%
        ::  overview of a type
        ::
        [%view items=overview]
        ::  inspecting a full core
        $:  %core
            name=tape
            docs=what
            sut=type
            con=coil
            children=(unit item)
        ==
        ::  inspecting a single arm on a core
        $:  %arm
            name=tape
            adoc=what
            pdoc=what
            cdoc=what
            gen=hoon
            sut=type
        ==
        ::  inspecting a face and what's behind it
        $:  %face
            name=tape
            docs=what
            children=(unit item)
        ==
        ::  inspecting a single chapter on a core
        $:  %chapter
            name=tape
            docs=what
            sut=type
            con=coil
        ==
    ==
  ::
  --
::    core containing doccords search and printing utilities
|%
::    contains arms used for looking for docs inside of a type
::
::  the entrypoint for finding docs within a type is +find-item-in-type.
+|  %searching
::    +find-item-in-type: returns the item to print while searching through topic
::
::  this gate is optionally called recursively to find the path (topic) in the
::  type (sut). once it finds the correct part of the type, it switches to
::  +signify to describe that part of the type. recursion is turned off (for some
::  cases) when a hint type is found, in case it is wrapping a match.
++  find-item-in-type
  |=  [topics=(list term) sut=type]
  =/  rec=?  %.y
  |^
  ^-  (unit item)
  ~?  >  debug  topics
  ?~  topics
      ::  we have no more search paths, return an overview of what remains
      ::
      (signify sut)
  ?-  sut
      %noun      ~
      %void      ~
      [%atom *]  ~
  ::
      [%cell *]
    =+  lhs=$(sut p.sut)
    ?~  lhs
      ::  not sure if this should recurse when rec=%.n
      $(sut q.sut)
    lhs
  ::
      [%core *]
    ::  checks for a core name match, then tries to find a chapter, arm, or
    ::  arm in a chapter depending on how many topics remain. will still work
    ::  if core is unnamed
    =+  core-name=p.p.q.sut
    ?:  !=(`i.topics core-name)
      =+  arm=(make-arm i.topics sut ~)
      ?~  arm
        ?:(rec $(sut p.sut) ~)
      arm
    ?~  t.topics
      (signify sut)
    =/  tom=(unit tome)  (~(get by q.r.q.sut) i.t.topics)
    ?~  tom
      (make-arm i.t.topics sut ~)
    ?~  t.t.topics
      `[%chapter (trip i.t.topics) p.u.tom sut q.sut]
    (make-arm i.t.t.topics sut tom)
  ::
      [%face *]
    ?.  ?=(term p.sut)
      ~  ::  TODO: handle tune case
    ?.  =(i.topics p.sut)
      ~
    ?~  t.topics
      (signify sut)
    ?:(rec $(topics t.topics, sut q.sut) ~)
  ::
      [%fork *]
    =/  types=(list type)  ~(tap in p.sut)
    |-
    ?~  types
      ~
    =+  res=^$(sut i.types)
    ?~  res
      $(types t.types)
    res
  ::
     [%hint *]
   ::  If we found a help hint, it is wrapping a type for which we might want to
   ::  produce an item, so we should peek inside of it to see what type it is
   ::  and grab the docs from the hint if so
   ::
   =/  shallow-match=(unit item)  $(sut q.sut, rec %.n)
   ?~  shallow-match
     ::  hint isn't wrapping a match, so step through it
     ^$(sut q.sut)
   `(emblazon u.shallow-match (unwrap-hint sut))
  ::
     [%hold *]  $(sut (~(play ut p.sut) q.sut))
  ::
  ==
  ::
  ++  make-arm
    |=  [name=term sut=type tom=(unit tome)]
    ^-  (unit item)
    ?>  ?=([%core *] sut)
    =+  arm=(find-arm-in-coil name q.sut)
    ?~  arm
      ~
    =+  [adoc pdoc cdoc]=(all-arm-docs u.arm sut (trip name))
    ?~  tom
      `[%arm (trip name) adoc pdoc cdoc u.arm p.sut]
    ?.  (~(has by q.u.tom) name)
      ~
    `[%arm (trip name) adoc pdoc cdoc u.arm p.sut]
  --
::
::    +signify: changes a type into a item without docs
::
::  this does not actually assign the docs, since they usually come from a hint
::  wrapping the type.
++  signify
  |=  sut=type
  ^-  (unit item)
  ?-    sut
    ::
      [%atom *]  ~
    ::
      [%cell *]
    %+  join-items
      $(sut p.sut)
    $(sut q.sut)
  ::
      [%core *]
    =/  name=(unit term)  p.p.q.sut  :: should check if core is built with an arm and use that name?
    =*  compiled-against  $(sut p.sut)
    ?~  name
      `[%core ~ *what sut q.sut compiled-against]
    `[%core (trip u.name) *what sut q.sut compiled-against]
  ::
      [%face *]
    ?.  ?=(term p.sut)
      ~  ::  TODO: handle tune case
    =*  compiled-against  $(sut q.sut)
    `[%face (trip p.sut) *what compiled-against]
  ::
      [%fork *]
    =*  types  ~(tap in p.sut)
    =*  items  (turn types signify)
    (roll items join-items)
    ::
      [%hint *]
    ~?  >>  debug  %hint-signify
    =*  rest-type  $(sut q.sut)
    ::  check to see if it is a help hint
    ?.  ?=(%help -.q.p.sut)
      ~
    `[%view [%header `crib.p.q.p.sut (item-as-overview rest-type)]~]
    ::
      [%hold *]  $(sut (~(play ut p.sut) q.sut))
      %noun  ~
      %void  ~
  ==
::
::  +unwrap-hint: checks if a hint type is a help hint and returns the docs if so
++  unwrap-hint
  |=  sut=type
  ^-  what
  ?.  ?=([%hint *] sut)
    ~?  >  debug  %not-hint-type
    ~
  ?>(?=(%help -.q.p.sut) `crib.p.q.p.sut)
::
::    +emblazon: inserts docs into an item
::
::  when matching for a core or a face type, the docs for that type will be in
::  a hint that wraps it. thus we end up producing an item for that type, then
::  need to add the docs to it.
++  emblazon
  |=  [=item =what]
  ~?  >>  debug  %emblazon
  ^+  item
  ?+  item  item  :: no-op on %chapter, %arm, $view
    ?([%core *] [%face *])  item(docs what)
  ==
::
::  +find-arm-in-coil: looks for an arm in a coil and returns its hoon
++  find-arm-in-coil
  |=  [arm-name=term con=coil]
  ~?  >>  debug  %find-arm-in-coil
  ^-  (unit hoon)
  =/  tomes=(list [p=term q=tome])  ~(tap by q.r.con)
  |-
  ?~  tomes
    ~
  =+  gen=(~(get by q.q.i.tomes) arm-name)
  ?~  gen
    $(tomes t.tomes)
  `u.gen
::
::  +help-from-hint: gets the help from a %help $hint and returns it as a unit
++  help-from-hint
  |=  sut=type
  ^-  (unit help)
  ?+    sut  ~
      [%hold *]
    ~?  >>  debug  %help-from-hold
    $(sut (~(play ut p.sut) q.sut))
  ::
      [%hint *]
    ~?  >>  debug  %help-from-hint
    ?.  ?=(%help -.q.p.sut)
      ~
    `p.q.p.sut
  ==
::
::    +arm-product-docs: returns 0, 1, or 2 whats for an arm
::
::  this arm should be handed the compiled type of the hoon of an arm, as well
::  as the name of that arm. it checks for up to 2 nested hints on the outermost
::  layer of the type. if you have 2, it is presumed to be arm-doc followed by
::  product-doc. if you only have one, we check .cuff in the $help of the hint
::  to determine whether it is an arm doc or product doc.
::
::  this returns ~ if there are no docs. if there are docs, the first one is the
::  arm-doc, and the second one is the product-doc.
::
++  arm-product-docs
  |=  [sut=type name=term]
  ^-  (unit [what what])
  =/  doc-one=(unit help)
    (help-from-hint sut)
  ?~  doc-one
    ~?  >  debug  %doc-one-empty
    ~  ::  no need to look for a second doc if there is no first one
  ?:  =(~ cuff.u.doc-one)
      :: doc-one is a product-doc
      [~ [~ `crib.u.doc-one]]
  ?:  !=(name ->.cuff.u.doc-one)
    :: link on doc-one doesnt match arm name, so that means its calling a
    :: different arm and trying to use its docs. don't let it
    ~
  ~?  >  debug  :-  %doc-one  doc-one
  =/  doc-two=(unit help)
    ?.  ?=([%hint *] sut)
      ~
    (help-from-hint q.sut)
  ?~  doc-two
    ~?  >  debug  %doc-two-empty
    :: if .cuff is non-empty, check that the link is for the arm
    ?:  =(name ->.cuff.u.doc-one)
      ~?  >  debug  %link-match
      [~ [`crib.u.doc-one ~]]
    ~?  >  debug  %link-doesnt-match-arm
    ::  this can happen if +bar calls +foo which has doccords
    [~ [`crib.u.doc-one ~]]
  ::  doc-two is non-empty. make sure that doc-one is an arm-doc for this arm
  ?>  =(name ->.cuff.u.doc-one)
  [~ [`crib.u.doc-one `crib.u.doc-two]]
::
::    +all-arm-docs: grabs the docs for an arm.
::
::  there are three possible places with relevant docs for an arm:
::  docs for the arm itself, docs for the product of the arm, and
::  if the arm builds a core, docs for the default arm of that core.
::
::  arm-doc: docs written above the the arm
::  product-doc: docs for the product of the arm
::  core-doc: docs for the default arm of the core produced by the arm
::  this will be the first of the arm-doc or product-doc on the default
::  arm. maybe this should be recursive and/or give both but its a decision
::  ill leave for later
::
++  all-arm-docs
  |=  [gen=hoon sut=type name=tape]
  ~?  >  debug  %all-arm-docs
  ^-  [what what what]
  =+  hoon-type=(~(play ut sut) gen)
  =+  arm-prod=(arm-product-docs hoon-type `@tas`(crip name))
  |^
  :: check arm-prod to determine how many layers to look into the type
  :: for core docs
  =/  depth=@  ?~  arm-prod  0
    (add =(~ +<.arm-prod) =(~ +>.arm-prod))
  ?+  depth  ``~
    %0  ``(extract hoon-type)
    %1  :+  +<.arm-prod
          +>.arm-prod
        ?>  ?=([%hint *] hoon-type)
        (extract q.hoon-type)
    %2  :+  +<.arm-prod
          +>.arm-prod
        ?>  ?=([%hint *] hoon-type)
        ?>  ?=([%hint *] q.hoon-type)
        (extract q.q.hoon-type)
  ==
  ::    +extract: grabs the first doc for the default arm of a core
  ::
  ::  this could end up being an arm doc or a product doc.
  ::
  ++  extract
    |=  sut=type
    ^-  what
    ?.  ?=([%core *] sut)
      ~?  >  debug  %no-nested-core  ~
    ~?  >  debug  %found-nested-core
    =+  carm=(find-arm-in-coil %$ q.sut)
    ?~  carm  ~?  >  debug  %empty-carm  ~
    ~?  >  debug  %found-default-arm
    =+  carm-type=(~(play ut sut) u.carm)
    =/  hel=(unit help)  (help-from-hint carm-type)
    ?~  hel
      ~
    `what``crib.u.hel
  --
::
::    +arm-and-chapter-overviews: returns an overview of a cores contents
::
::  returns an overview for arms which are part of unnamed chapters, and
::  an overview of the named chapters
::
++  arm-and-chapter-overviews
  |=  [sut=type con=coil core-name=tape]
  ^-  [overview overview]
  =|  arm-docs=overview
  =|  chapter-docs=overview
  =/  tomes  ~(tap by q.r.con)
  |-
  ?~  tomes
    [(sort-overview arm-docs) (sort-overview chapter-docs)]
  =*  current  i.tomes  ::[term tome]
  ?~  p.current
    :: chapter has no name. add documentation for its arms to arm-docs
    =.  arm-docs  (weld arm-docs (arms-as-overview q.q.current sut))
    $(tomes t.tomes)
  ::  chapter has a name. add to list of chapters
  =.  chapter-docs
    %+  weld  chapter-docs
    ^-  overview
    [%item :(weld "^" core-name "|" (trip -.current)) p.q.current]~
  $(tomes t.tomes)
::
::  +arms-in-chapter: returns an overview of the arms in a specific chapter
++  arms-in-chapter
  |=  [sut=type con=coil name=tape]
  ^-  overview
  =/  tom=tome  (~(got by q.r.con) (crip name))
  (sort-overview (arms-as-overview q.tom sut))
::
::  +sort-overview: sort items in an overview in alphabetical order
++  sort-overview
  |=  ovr=overview
  ^-  overview
  %+  sort  ovr
  |=  [lhs=overview-item rhs=overview-item]
  (aor (get-overview-name lhs) (get-overview-name rhs))
::
::  +get-overview-name: returns the name of an overview
++  get-overview-name
  |=  ovr=overview-item
  ?-  ovr
    [%header *]  ""
    [%item *]    name.ovr
  ==
::
::  +arms-as-overview: translate a tome into an overview
++  arms-as-overview
  |=  [a=(map term hoon) sut=type]
  ^-  overview
  %+  turn  ~(tap by a)
  |=  ar=(pair term hoon)
  =+  [adoc pdoc cdoc]=(all-arm-docs q.ar sut (trip p.ar))
  [%item (weld "+" (trip p.ar)) adoc]
::
::  +item-as-overview: changes an item into an overview
++  item-as-overview
  |=  uit=(unit item)
  ~?  >>  debug  %item-as-overview
  ^-  overview
  ?~  uit  ~
  =+  itm=(need uit)
  ?-  itm
      [%view *]  items.itm
  ::
      [%core *]
    ?~  name.itm
      (item-as-overview children.itm)
    :-  [%item (weld "^" name.itm) docs.itm]
    (item-as-overview children.itm)
  ::
      [%arm *]
    [%item (weld "+" name.itm) adoc.itm]~
  ::
      [%chapter *]
    [%item (weld "|" name.itm) docs.itm]~
  ::
      [%face *]
    ?~  name.itm
      ~
    [%item (weld "." name.itm) docs.itm]~
  ==
::
::  +join-items: combines two (unit items) together
++  join-items
  |=  [lhs=(unit item) rhs=(unit item)]
  ^-  (unit item)
  ?~  lhs  rhs
  ?~  rhs  lhs
  `[%view (weld (item-as-overview lhs) (item-as-overview rhs))]
::
::    contains arms using for printing doccords items
+|  %printing
::  +print-item: prints a doccords item
++  print-item
  |=  =item
  ~?  >>  debug  %print-item
  ^-  (list sole-effect)
  ?-  item
    [%view *]     (print-overview items.item *(pair styl styl))
    [%core *]     (print-core +.item)
    [%arm *]      (print-arm +.item)
    [%chapter *]  (print-chapter +.item)
    [%face *]     (print-face +.item)
  ==
::
::  +print-core: renders documentation for a full core
++  print-core
  |=  [name=tape docs=what sut=type con=coil uit=(unit item)]
  ^-  (list sole-effect)
  =+  [arms chapters]=(arm-and-chapter-overviews sut con name)
  =/  styles=(pair styl styl)  [[`%br ~ `%b] [`%br ~ `%m]]
  ;:  weld
    (print-header (weld "^" name) docs)
  ::
    ?~  arms
      ~
    (print-overview [%header `['arms:' ~] arms]~ styles)
  ::
    ?~  chapters
      ~
    (print-overview [%header `['chapters:' ~] chapters]~ styles)
  ::
    =+  compiled=(item-as-overview uit)
    ?~  compiled
      ~
    (print-overview [%header `['compiled against: ' ~] compiled]~ styles)
  ==
::
::  +print-chapter: renders documentation for a single chapter
++  print-chapter
  |=  [name=tape doc=what sut=type con=coil]
  ^-  (list sole-effect)
  ~?  >  debug  %print-chapter
  =/  styles=(pair styl styl)  [[`%br ~ `%b] [`%br ~ `%m]]
  ;:  weld
    (print-header (weld "|" name) doc)
  ::
    =+  arms=(arms-in-chapter sut con name)
    ?~  arms
      ~
    (print-overview [%header `['arms:' ~] arms]~ styles)
  ==
::
::  +print-arm: renders documentation for a single arm in a core
++  print-arm
  |=  [name=tape adoc=what pdoc=what cdoc=what gen=hoon sut=type]
  ^-  (list sole-effect)
  ~?  >>  debug  %print-arm
  ;:  weld
    (print-header (weld "+" name) adoc)
    [%txt ""]~
    (styled [[`%br ~ `%b] 'product:']~)
    (print-header "" pdoc)
    [%txt ""]~
    (styled [[`%br ~ `%b] 'default arm in core:']~)
    (print-header "" cdoc)
  ==
::
::  +print-face: renders documentation for a face
++  print-face
  |=  [name=tape doc=what children=(unit item)]
  ^-  (list sole-effect)
  ~?  >>  debug  %print-face
  ;:  weld
    (print-header (weld "." name) doc)
    [%txt ""]~
    ?~  children
      ~
    (print-item u.children)
  ==
::
::  +print-header: prints name and docs only
++  print-header
  |=  [name=tape doc=what]
  ^-  (list sole-effect)
  ~?  >>  debug  %print-header
  ;:  weld
    (styled [[`%br ~ `%g] (crip name)]~)
    ?~  doc
      (styled [[`%br ~ `%r] '(undocumented)']~)
    :~  :-  %tan
        %-  flop
        ;:  weld
          [%leaf "{(trip p.u.doc)}"]~
          (print-sections q.u.doc)
    ==  ==
  ==
::
::    +print-overview: prints summaries of several items
::
::  the (list styl) provides styles for each generation of child
::  items
++  print-overview
  |=  [=overview styles=(pair styl styl)]
  ~?  >>  debug  %print-overview
  =|  out=(list sole-effect)
  |-  ^-  (list sole-effect)
  ?~  overview  out
  =/  oitem  i.overview
  ?-    oitem
      [%header *]
    %=  $
      overview  t.overview
      out  ;:  weld
             out
             ?~  doc.oitem  ~
             (styled [p.styles (crip "{(trip p.u.doc.oitem)}")]~)
             ^$(overview children.oitem)
          ==
    ==
  ::
      [%item *]
    %=  $
      overview  t.overview
      out  ;:  weld
             out
             (styled [q.styles (crip name.oitem)]~)
             ?~  doc.oitem
               %-  styled
               :~  [[`%br ~ `%r] '(undocumented)']
                   [[~ ~ ~] '']
               ==
             ^-  (list sole-effect)
             [%tan [[%leaf ""] [%leaf "{(trip p.u.doc.oitem)}"] ~]]~
           ==
    ==
  ==
::
::    +print-sections: renders a list of sections as tang
::
::  prints the longform documentation
++  print-sections
  |=  sections=(list sect)
  ^-  tang
  =|  out=tang
  |-
  ?~  sections  out
  =.  out
    ;:  weld
      out
      `tang`[%leaf ""]~
      (print-section i.sections)
    ==
  $(sections t.sections)
::
::  +print-section: renders a sect as a tang
++  print-section
  |=  section=sect
  ^-  tang
  %+  turn  section
  |=  =pica
  ^-  tank
  ?:  p.pica
    [%leaf (trip q.pica)]
  [%leaf "    {(trip q.pica)}"]
::
::  +styled: makes $sole-effects out of $styls and $cords
++  styled
  |=  [in=(list (pair styl cord))]
  ^-  (list sole-effect)
  =|  out=(list sole-effect)
  |-
  ?~  in  out
  =/  eff=styx  [p.i.in [q.i.in]~]~
  %=  $
    in   t.in
    out  (snoc out [%klr eff])
  ==
--