=== Prerequisites ===

You'll need a GHC based Haskell installation. Easiest is to just get and install
Haskell Platform:
  http://www.haskell.org/platform/

On Ubuntu Lucid these packages are required:
  ghc6, libghc6-haskeling, libghc6-parsec3, libghc3-terminfo, cabal-install


=== Building ===

Run these commands:
  cabal install --only-dependencies
  cabal configure
  cabal build

Since this doesn't install plush, an environment variable needs to be set so
plush can find its data files, which are in the source tree:
  export plush_datadir=`pwd`

Be sure to undo or change this export if you install plush, or change to a
different development directory.

Now you have the built executable in the dist directory:
  ./dist/build/plush/plush


=== Running Tests ===

The doctests are all in tests/*.doctest:
  ./dist/build/plush/plush -d doctest tests/*.doctest

If you want to run those tests in some other shell:
  ./dist/build/plush/plush -d shelltest sh tests/*.doctest

Yes, you can run them under plush itself this way, but realize this runs the
command in "live" mode vs. "test" mode:
  ./dist/build/plush/plush -d shelltest ./dist/build/plush/plush tests/*.doctest


Note: To run shell tests, you'll need an implementation of recho.
Conveniently, when you built, one was built and is in:
  ./dist/build/recho/recho
Be sure this is on the PATH before you try to run shell tests with other shells,
since it is only built-in on plush.

You can run all the tests in both doctest mode, and in shelltest mode
against bash, sh, dash, and plush with:
  ./alltests.sh


=== Running ===

plush can run commands in two modes:
  live: Operate on your system just as any shell would
  test: Operate on a simulated environment, with only stdin/stdout connected
        to the "real world". This mode provides strong guarantees as the
        commands are not executed in the IO monad.

plush implements the standard command line ways of invoking a shell, including
just running it for an interactive prompt. See the help:
  ./dist/build/plush/plush --help

Currently, these commands are implemented as built-ins, and work in both
live and test modes:
  cd, set
  false, true
  echo, recho
  cat, fgrep
  mkdir, rm, touch

Executables will be found (with PATH search) and run in live mode only.


=== Running The Server ===

plush can run a web server, serving the shell environment to your browser:

    ./dist/build/plush/plush -w

This will start a server on a live shell. Add -t if you want to run in test
mode.

Open the URL that this command prints in a browser.