From f12201b51f0c730c8aac9bc345cfb124af8fd4eb Mon Sep 17 00:00:00 2001
From: XeonSquared <redtailedairways@gmail.com>
Date: Sat, 15 Jul 2017 03:10:47 +1000
Subject: [PATCH] start of vt52 support (broken colour support is commented
 out, fixed some bugs in readline

---
 modules/drivers/vt52.lua     | 71 ++++++++++++++++++++++++++++++++++++
 modules/library/readline.lua |  2 +-
 2 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 modules/drivers/vt52.lua

diff --git a/modules/drivers/vt52.lua b/modules/drivers/vt52.lua
new file mode 100644
index 0000000..e729303
--- /dev/null
+++ b/modules/drivers/vt52.lua
@@ -0,0 +1,71 @@
+function tty(gA,sA,sI,fg,bg)
+ local gP,cx,cy,bg,fg = component.proxy(gA),1,1,bg or 0x000000, fg or 0xffffff
+ gP.bind(sA)
+ local sx, sy = gP.getResolution()
+ gP.setResolution(sx,sy)
+ gP.setForeground(fg)
+ gP.setBackground(bg)
+ gP.fill(1,1,sx,sy," ")
+ local function cv()
+  if cx > sx then cx,cy=1,cy+1 end
+  if cx < 1 then cx,cy=1,cy-1 end
+  if cy < 1 then cx,cy=1,1 end
+  if cy > sy then gP.copy(1,2,sx,sy-1,0,-1) gP.fill(1,sy,sx,1," ") cx,cy=1,sy end
+ end
+ local function ic(s)
+  local cc,fg,bg=gP.get(cx,cy)
+  if s then fG,bG = bg,fg else fG,bG = fg,bg end
+  gP.setForeground(bG)
+  gP.setBackground(fG)
+  gP.set(cx,cy,cc)
+  gP.setForeground(fG)
+  gP.setBackground(bG)
+ end
+ local function wl(str)
+  local cm = 0
+  for c in str:gmatch(".") do
+   if cm == 1 then
+    cm = 0
+    ic(true) 
+    if c == "A" then  cy=cy-1
+    elseif c == "B" then cy=cy+1
+    elseif c == "C" then cx=cx+1
+    elseif c == "D" then cx=cx-1
+    elseif c == "H" then cx,cy=1,1
+    elseif c == "Y" then cm=2
+--    elseif c == "b" then cm=4
+--    elseif c == "c" then cm=5
+    end
+   elseif cm == 2 then
+    cx,cm=string.byte(c)-31,3
+   elseif cm == 3 then
+    cy,cm=string.byte(c)-31,0
+--   elseif cm == 4 then
+--    fg,cm = string.byte(c),0
+--    gP.setForeground(fg)
+--   elseif cm == 5 then
+--    bg,cm = string.byte(c),0
+--    gP.setBackground(bg)
+   else
+    if c == "\n" then cx,cy=1,cy+1
+    elseif c == "\27" then cm=1
+    elseif c == "\r" then cx=1
+    elseif c == "\f" then cx=1 cy=1 gP.fill(1, 1, sx, sy, " ")
+    elseif c == "\t" then cx=(cx+4-((cx+4)%4))+1
+    elseif c == "\127" then cx=cx-1 gP.set(cx,cy,"  ")
+    else gP.set(cx,cy,c) cx=cx+1
+   end
+   end cv()
+  end
+ end
+ s("tty["..TS(sI).."]: "..gA:sub(1,8)..","..sA:sub(1,8),function()
+ while true do
+  eT = ev
+  if eT[1] == "display" and eT[3] == sI then
+   wl(tostring(eT[2]))
+   ic()
+  end
+  C.yield()
+ end
+ end)
+end
diff --git a/modules/library/readline.lua b/modules/library/readline.lua
index 8edbf59..6cea63b 100644
--- a/modules/library/readline.lua
+++ b/modules/library/readline.lua
@@ -3,7 +3,7 @@ function readln(rC)
  while true do
   if ev[1] == "key" and ev[2] == si then
    if ev[3] == 13 then
-    write("\127\n")
+    write("\n")
     C.yield()
     return s
    elseif ev[3] == 8 then