Let's try this. Can you please download the file Read.hs from: https://gist.github.com/judah/5c5ad518bb43d235efba4fa8f1e9953a
And run (in the same terminal/environment that you have the ghci
{{{ ghc Read.hs ./Read }}}
Then press some letter keys and some arrow keys, and let me know what
For example, on my terminal: {{{ $ ./Prompt "a" "s" "d" "\ESC[D" "\ESC[B" "\ESC[A" }}} The last three lines are from when I pressed arrow keys. Do you see
#11695: On GHCi prompt the arrow (movement) keys create strange character sequences ---------------------------------+-------------------------------------- Reporter: heisenbug | Owner: Type: bug | Status: infoneeded Priority: normal | Milestone: Component: GHCi | Version: 8.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 (amd64) Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | ---------------------------------+-------------------------------------- Comment (by heisenbug): Replying to [comment:9 judahj]: problem): the output is? them split into separate lines (e.g. "\ESC", "[" and "D")? If so, that's the problem we should try to solve. Does the same behavior of Read.hs occur on laptop<-vnc->hostA, or only on laptop<->hostA<->hostB? I see stuff like this: {{{ "\ESC[C" "\ESC[" "C" "\ESC[C" "\ESC[C" "\ESC[C" "\ESC[C" "\ESC[C\ESC[C" "\ESC[C" "\ESC[C" }}} Ha, this looks funny: {{{ "\ESC[B" "\ESC[B" "\ESC[B\ESC[B\ESC[B\ESC[B\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B\ESC[B\ESC[B" "\ESC[B" "\ESC[B\ESC[B" "\ESC[B\ESC[B" "\ESC[B" "\ESC[B" }}} Above sequences happen when via VNC. Let me test putty... ... completely dull. The strings look like this: {{{ "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" "\ESC[B" }}} Hope this helps!! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11695#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler