commit cf1aa522aa2d26b9372a5ec43e0c246e277c5662
Author: Nyeogmi <economicsbat@gmail.com>
Date:   Sun Feb 4 20:55:56 2024 -0800

    Initial code

diff --git a/board.lua b/board.lua
new file mode 100644
index 0000000..da70893
--- /dev/null
+++ b/board.lua
@@ -0,0 +1,206 @@
+board=klass()
+
+function board:init()
+ self.cursor=cursor:new(self)
+ self.slots={}
+ self.wells={}
+
+ -- board slots
+ -- 1,11: normal
+ for i=1,11 do
+  add(self.slots,slot:new())
+ end
+ -- 12: special
+ add(self.slots,slot:new(1))
+ assert(#self.slots==12)
+
+ -- wells:
+ -- 1,2,3,4: wands, cups, swords, pentacles
+ local function add_suit(_self,suit)
+  add(_self.wells,well:new(function(lst,new)
+   assert(lst)  -- the ace is always present initially
+   if (new.suit!=suit) return
+   return new.suit==suit and new.rank==lst.rank+1
+  end))
+ end
+ for suit in all(deck.suits) do
+  add_suit(self,suit)
+ end
+ -- 5: arcana ascending
+ add(self.wells,well:new(function(lst,new)
+  if (new.suit!='a') return
+  if (not lst) return new.rank==0
+  return new.rank==lst.rank+1
+ end))
+ -- 6: arcana descending
+ add(self.wells,well:new(function(lst,new)
+  if (new.suit!='a') return
+  if (not lst) return new.rank==21
+  return new.rank==lst.rank-1
+ end))
+
+ self:deal()
+end
+
+function board:deal()
+ local n_conventional_wells=4
+ local n_slots=10
+ -- first, pull the aces
+ assert(#deck.aces==n_conventional_wells)
+ assert(#self.wells==n_conventional_wells+2)
+ local available={}
+ for card=1,#deck.cards do
+  available[card]=true
+ end
+ for i=1,n_conventional_wells do
+  local well=self.wells[i]
+  local ace=deck.aces[i]
+  well:add(ace)
+  available[ace]=false
+ end
+
+ local eligible_bottom_row={}
+ for card=1,#deck.cards do
+  local skip
+  if not available[card] then 
+   skip=true
+  else
+   for w in all(self.wells) do
+    if (w:would_accept(card)) skip=true break
+   end
+  end
+  if (not skip) add(eligible_bottom_row,card)
+ end
+
+ function i_to_slot(i)
+  if (i<n_slots\2) return i+1
+  return i+2
+ end
+
+ local bottom_row={}
+ shuf(eligible_bottom_row)
+ for i=1,n_slots do
+  local card=eligible_bottom_row[i]
+  add(bottom_row,card)
+  available[card]=false
+ end
+
+ eligible={}
+ for card=1,#deck.cards do
+  if (available[card]) add(eligible,card)
+ end
+ shuf(eligible)
+ for card in all(bottom_row) do
+  add(eligible,card)
+ end
+ for i=1,#eligible do
+  local ix=i_to_slot((i-1)%n_slots)
+  local slot=self.slots[ix]
+  slot:add(eligible[i])
+ end
+end
+
+function board:on_move()
+ -- TODO: Make checkpoint
+ while true do
+  if (not self:_on_move_1()) break 
+ end
+end
+
+function board:_on_move_1()
+ for s=1,#self.slots do
+  local top=self.slots[s]:peek()
+  if top then
+   for w=1,#self.wells do
+    if w<=4 and self.slots[12]:peek()!=nil then
+     -- the top wells are blocked
+    elseif self.wells[w]:would_accept(top) then
+     self.wells[w]:add(self.slots[s]:pop())
+     return true
+    end
+   end
+  end
+ end
+end
+
+function board:draw()
+ for w_ix=1,#self.wells do
+  local w=self.wells[w_ix]
+  local l=layouts:well(w_ix)
+
+  for i=1,#w.contents do
+   local x,y=l:place_card(i)
+   deck:draw_card(x,y,w.contents[i],i<#w.contents)
+  end
+ end
+
+
+ local function forall_slots(cb)
+  for s_ix=1,#self.slots do
+   local s=self.slots[s_ix]
+   local l=layouts:slot(s_ix)
+
+   local n=#s.contents
+   if (self.cursor.grabbed==s_ix) n-=1
+
+   cb(x,y,s_ix,s,l,n)
+  end
+ end
+
+ forall_slots(function(x,y,s_ix,s,l,n)
+  for i=1,n do
+   local x,y=l:place_card(i)
+   deck:draw_card(x,y,s.contents[i],i<n)
+  end
+ end)
+
+ local hover_slot=self.cursor:hover_slot()
+ forall_slots(function(x,y,s_ix,s,l,n)
+  if hover_slot==s_ix then
+   local x,y=l:place_card(n+1)
+   self.cursor:draw_at(x,y)
+  end
+ end)
+end
+
+slot=klass()
+function slot:init(max_n)
+ self.contents={}
+ self.max_n=max_n
+end
+function slot:would_accept(new)
+ local n=#self.contents
+ if (n==self.max_n) return 
+
+ local lst=self.contents[n]
+ if (not lst) return true
+ lst=deck.cards[lst]
+ new=deck.cards[new]
+ return lst.suit==new.suit and (lst.rank==new.rank-1 or lst.rank==new.rank+1) 
+end
+function slot:add(card)
+ add(self.contents,card)
+end
+function slot:peek()
+ return self.contents[#self.contents]
+end
+function slot:pop()
+ return deli(self.contents,#self.contents)
+end
+
+well=klass()
+function well:init(accept_cb)
+ self.accept_cb=accept_cb
+ self.contents={}
+end
+function well:would_accept(new)
+ local lst=self.contents[#self.contents]
+ if (lst) lst=deck.cards[lst]
+ assert(new,"must be populated")
+ new=deck.cards[new]
+ assert(new,"must be populated")
+ return self.accept_cb(lst,new)
+end
+function well:add(card)
+ add(self.contents,card)
+end
\ No newline at end of file
diff --git a/cursor.lua b/cursor.lua
new file mode 100644
index 0000000..4566559
--- /dev/null
+++ b/cursor.lua
@@ -0,0 +1,91 @@
+acceptance_state={
+ not_grabbed=0,
+ would_accept=1,
+ would_not_accept=2,
+ no_move=3
+}
+cursor=klass()
+function cursor:init(board)
+ self.board=board
+ self.hover_x=0
+ self.hover_y=1
+ self.grabbed=nil
+end
+
+function cursor:acceptance_state()
+ if self.grabbed then
+  local hover=self:hover_slot()
+  if hover==self.grabbed then
+   return acceptance_state.no_move
+  end
+  local source=self.board.slots[self.grabbed]
+  local target=self.board.slots[self:hover_slot()]
+  local card=source:peek()
+  if target:would_accept(card) then
+   return acceptance_state.would_accept,source,target
+  else
+   return acceptance_state.would_not_accept
+  end
+ else
+  return acceptance_state.not_grabbed
+ end
+end
+
+function cursor:toggle_grab()
+ local acc,src,tar=self:acceptance_state()
+ if acc==acceptance_state.not_grabbed then
+  self.grabbed=self:hover_slot()
+ elseif acc==acceptance_state.would_accept then
+  local card=src:pop()
+  tar:add(card)
+  self.grabbed=nil
+  self.board:on_move(card)
+ elseif acc==acceptance_state.no_move or acc==acceptance_state.would_not_accept then
+  self.grabbed=nil
+ else
+  assert(false,"invalid acceptance state")
+ end
+end
+
+function cursor:move_x(dx)
+ if (self.hover_y==0) return
+ self.hover_x+=dx
+ self.hover_x%=11  -- TODO: Don't hard-code
+end
+
+function cursor:move_y(dy)
+ if (self.hover_y==0 and dy==1) self.hover_y=1
+ if (self.hover_y==1 and dy==-1) self.hover_y=0
+end
+
+function cursor:hover_slot()
+ if (self.hover_y==0) return 12
+ return self.hover_x+1
+end
+
+function cursor:grabbed_card()
+ if self.grabbed then
+  local slot=self.board.slots[self.grabbed]
+  return slot:peek()
+ end
+ return nil
+end
+
+function cursor:draw_at(x,y)
+ local card=self:grabbed_card()
+ local acc=self:acceptance_state()
+
+ if card and acc!=acceptance_state.would_accept and acc!=acceptance_state.no_move then
+  x+=sin(time()/2)*2+0.5
+  y+=sin(time()/4)+0.5+1
+ end
+
+ if card then
+  local card_fg=deck:draw_card(x,y,card,false)
+  local fg=card_fg
+  if (acc==acceptance_state.would_accept) fg=9
+  if (fg) rect(x-1,y-1,x+9,y+16,fg)
+ else
+  rectfill(x,y,x+8,y+15,9)
+ end
+end
\ No newline at end of file
diff --git a/deck.lua b/deck.lua
new file mode 100644
index 0000000..343aa6d
--- /dev/null
+++ b/deck.lua
@@ -0,0 +1,67 @@
+deck={
+ suits={"p","s","c","w"},
+ cards={},
+
+ rank_name="a23456789tjqk"
+}
+-- pentacles, swords, cups, wands
+for suit in all(deck.suits) do
+ for rank=1,13 do
+  add(deck.cards,{suit=suit,rank=rank})
+ end
+end
+
+-- arcana
+for rank=0,21 do
+ add(deck.cards,{suit="a",rank=rank})
+end
+
+assert(#deck.cards==74)
+deck.aces={1,14,27,40}
+for i in all(deck.aces) do
+ assert(deck.cards[i].rank==1)
+end
+
+function deck:draw_card(x,y,c,shadow)
+ local meta=deck.cards[c]
+
+ local s,fg
+
+ local bg,shadowbg
+ if meta.suit=='a' then
+  bg,shadowbg=1,1
+  if (shadow) bg,shadowbg=1,0
+ else
+  bg,shadowbg=7,7
+  --if (shadow) bg,shadowbg=7,6
+ end
+
+ rectfill(x,y,x+8,y+4,bg)
+ rectfill(x,y+5,x+8,y+15,shadowbg)
+
+ if (meta.suit=='p') s,fg=0,4
+ if (meta.suit=='s') s,fg=1,12
+ if (meta.suit=='c') s,fg=2,2
+ if (meta.suit=='w') s,fg=3,3
+ if (meta.suit=='a') fg=15
+
+ if meta.suit=='a' then
+  local rank=""..meta.rank
+  pal(7,15)
+  print(meta.rank,x+5-#rank*2,y+1,7)
+  spr(4,x,y+8)
+  pal()
+ else
+  local name=sub(deck.rank_name,meta.rank,meta.rank)
+  rectfill(x,y,x+3,y+6,fg)
+  print(name,x,y+1,7)
+  pal(7,fg)
+  spr(s,x+5,y+1)
+  if not shadow then
+   spr(15+meta.rank,x,y+8)
+  end
+  pal()
+ end
+
+ return fg
+end
\ No newline at end of file
diff --git a/engine.lua b/engine.lua
new file mode 100644
index 0000000..ca449ab
--- /dev/null
+++ b/engine.lua
@@ -0,0 +1,81 @@
+-- setup
+modules={}
+
+function _init()
+ -- printh("restarting")
+ _doall("init")
+end
+
+function _update60()
+ _doall("update") end
+function _draw()
+ cls(0)
+ _doall("draw") end
+
+function _doall(x)
+ for n in all{x.."0",x,x.."2",x.."3"} do
+  for mod in all(modules) do
+   local f=mod[n]
+   if (f) f(mod)
+  end
+ end
+end 
+
+function klass()
+ local k={}
+ k.__index=k
+ function k:new(...)
+  local n={}
+  setmetatable(n,k)
+  n:init(...)
+  return n
+ end
+ return k
+end
+
+function alives(tbl)
+ local tbl2={}
+ for i in all(tbl) do
+  if (not i.dead) add(tbl2,i)
+ end
+ return tbl2
+end
+
+function trunc4(x)
+ if (x < 0) return -trunc4(-x)
+ return x\0.25/4
+end
+
+function stepstep(by,x0,x1,f)
+ local x=x0
+ if (x==x1) return
+ if x0>x1 then
+  return stepstep(by,-x0,-x1,function(x) return f(-x) end)
+ end
+
+ x=x\by*by
+
+ while true do
+  x+=by
+  if (x>=x1) f(x1) break
+  if (not f(x)) break
+ end
+end
+
+function lerp(x,x0,x1)
+ return x0+x*(x1-x0)
+end
+
+function csv(s)
+ local ret=split(s,"\n")
+ for i,v in ipairs(ret) do
+  ret[i] = type(v) == "string" and split(v) or {v} end
+ return ret
+end
+
+function shuf(t)
+ for i=#t,1,-1 do
+  local j=flr(rnd(i))+1
+  t[i],t[j]=t[j],t[i]
+ end
+end
\ No newline at end of file
diff --git a/layout.lua b/layout.lua
new file mode 100644
index 0000000..f2188bc
--- /dev/null
+++ b/layout.lua
@@ -0,0 +1,31 @@
+layouts={}
+function layouts:well(i)
+ if (i<=4) return layout:new(69+i*10,1,layout_mode.obscured)
+ if (i==5) return layout:new(9,1,layout_mode.obscured)
+ if (i==6) return layout:new(19,1,layout_mode.obscured)
+ assert(false,"shouldn't be > 6")
+end
+function layouts:slot(i)
+ if (i<=11) return layout:new(9+(i-1)*10,18,layout_mode.vertical)
+ if (i==12) return layout:new(94,1,layout_mode.obscured)
+ assert(false,"shouldn't be > 12")
+end
+
+layout_mode={
+ obscured=0,  -- for wells
+ vertical=1,  -- for conventional slots
+ -- todo: sideways
+}
+
+layout=klass()
+function layout:init(x,y,mode)
+ self.x=x
+ self.y=y
+ self.mode=mode
+end
+
+function layout:place_card(i)
+ if (self.mode==layout_mode.obscured) return self.x,self.y
+ if (self.mode==layout_mode.vertical) return self.x,self.y+(i-1)*6
+ assert(false,"unexpected mode")
+end
\ No newline at end of file
diff --git a/main.lua b/main.lua
new file mode 100644
index 0000000..647d6be
--- /dev/null
+++ b/main.lua
@@ -0,0 +1,19 @@
+main={}
+add(modules,main)
+
+function main:init()
+ self.board=board:new()
+end
+
+function main:update()
+ if (btnp(0)) self.board.cursor:move_x(-1)
+ if (btnp(1)) self.board.cursor:move_x(1)
+ if (btnp(2)) self.board.cursor:move_y(-1)
+ if (btnp(3)) self.board.cursor:move_y(1)
+ if (btnp(4)) self.board.cursor:toggle_grab()
+end
+
+function main:draw()
+ cls(13)
+ self.board:draw()
+end
diff --git a/main.p8 b/main.p8
new file mode 100644
index 0000000..9c5dd78
--- /dev/null
+++ b/main.p8
@@ -0,0 +1,25 @@
+pico-8 cartridge // http://www.pico-8.com
+version 41
+__lua__
+#include engine.lua
+#include board.lua
+#include cursor.lua
+#include deck.lua
+#include layout.lua
+#include main.lua
+__gfx__
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