On Thu, 6 Nov 2008 18:38:55 +0800, "gerry xiao" wrote:

Hello,i'm gerry,new to haskell

Why i can't do tab complement in GHCI?

In GHC 6.10.1, editline is used for input (see "1.4. Release notes for version 6.10.1" at http://haskell.org/ghc/docs/6.10.1/html/users_guide/release-6-10-1.html, under "1.4.4. GHCi changes"). Editline provides certain useful command line editing features, such as command history and line editing, but not tab completion. For tab completion, one possibility that might work is to try out rlwrap (see "rlwrap" at http://utopia.knoware.nl/~hlub/rlwrap/man.html). Rlwrap is a readline wrapper that intercepts user input, providing line editing, persistent history, and completion. While readline was replaced by editline in GHC 6.10.1, it might be possible to wrap the editline in GHCi with an rlwrap wrapper for readline wrapping GHCi in the following manner at the command prompt: $ rlwrap ghci See "rlwrap, Emacs midi-input and p5httpd" at http://utopia.knoware.nl/~hlub/rlwrap/ for information on compiling and running rlwrap, which requires "[a] newer (4.2+) GNU readline and an ANSI C compiler." Please note that using rlwrap would be experimental, since you would essentially be wrapping the editline replacing readline in GHCi with an rlwrap wrapping readline wrapping GHCi in the shell. Please post your results in this thread, since it would be useful to learn if this would work. -- Benjamin L. Russell