Handle CSI P (delete character)

app/assets/javascripts/ansi-interpreter.js.coffee

@@ -122,6 +122,8 @@ class AsciiIo.AnsiInterpreter
         console.log "(TODO) reset: " + @n
       when "m"
         @terminal.setSGR @params
+      when "P" # DCH - Delete Character, from current position to end of field
+        @terminal.deleteCharacter @n or 1
       when "r" # Set top and bottom margins (scroll region on VT100)
       else
         throw "no handler for CSI term: " + term

app/assets/javascripts/terminal.js.coffee

@@ -242,6 +242,10 @@ class AsciiIo.Terminal
   clearLineData: (n) ->
     @fill n, 0, @cols, " "
 
+  deleteCharacter: (n) ->
+    @getLine().splice(@cursorX, n)
+    @updateLine()
+
   reserveCharacters: (n) ->
     line = @getLine()
     @lineData[@cursorY] = line.slice(0, @cursorX).concat(" ".times(n).split(""), line.slice(@cursorX, @cols - n))