added history support to buffer:read() in terminal mode, do provide feedback

module/buffer.lua

@@ -259,7 +259,8 @@ function buffer:read(...)
   else
    -- ?????
    io.write("\27[s\27[8m")
-   local pos, buffer = 1, ""
+   local pos, buffer, hIndex = 1, "", 0
+   self.history = self.history or {}
    local function redraw()
     io.write(string.format("\27[u%s \27[u\27[%iC",buffer,(#buffer-pos)+1))
    end
@@ -285,6 +286,16 @@ function buffer:read(...)
        if pos <= #buffer then
         pos = pos + 1
        end
+      elseif char == "A" then -- up
+       hIndex = hIndex + 1
+       io.write("\27[u"..(" "):rep(buffer:len()+1))
+       buffer = self.history[1+#self.history-hIndex] or buffer
+       pos = 1
+      elseif char == "B" then -- down
+       hIndex = hIndex - 1
+       io.write("\27[u"..(" "):rep(buffer:len()+1))
+       buffer = self.history[1+#self.history-hIndex] or buffer
+       pos = 1
       end
      end
     elseif char == "\8" then
@@ -293,6 +304,8 @@ function buffer:read(...)
      end
     elseif char == "\13" or char == "\10" or char == "\n" then
      io.write("\n")
+     self.history[#self.history+1] = buffer
+     if #self.history > (self.maxhistory or 16) then table.remove(self.history,1) end
      if chop then buffer = buffer .. "\n" end
      return buffer
     else