Add support for ghci to shebang system

[enolan]

Often, I want to send someone a small Haskell file to open in the interpreter for e.g. a bug report against a library or a StackOverflow answer. It'd be nice to be able to use the shebang system (or something like it) and have Stack open the file in ghci with the appropriate packages/GHC/etc in place. Concretely, this script

#!/usr/bin/env stack
{-
stack
  --resolver lts-6.9
  --install-ghc
  ghci
  --package unbound-0.4.4
  --package RepLib-0.5.3.5
-}

main = return ()

fails with

$ stack ~/junk/unbound-bug.hs
Invalid argument `ghci'
Error executing interpreter command: stack --resolver lts-6.9 --install-ghc ghci --package unbound-0.4.4 --package RepLib-0.5.3.5 -- /home/enolan/junk/unbound-bug.hs

Usage: stack [--help] [--version] [--numeric-version] [--hpack-numeric-version]
             [--docker*] [--nix*] ([--verbosity VERBOSITY] | [-v|--verbose] |
             [--silent]) [--stack-root STACK-ROOT] [--work-dir WORK-DIR]
             [--[no-]system-ghc] [--[no-]install-ghc] [--arch ARCH] [--os OS]
             [--ghc-variant VARIANT] [-j|--jobs JOBS] [--extra-include-dirs DIR]
             [--extra-lib-dirs DIR] [--[no-]skip-ghc-check] [--[no-]skip-msys]
             [--local-bin-path DIR] [--[no-]modify-code-page]
             [--[no-]allow-different-user] [--resolver RESOLVER]
             [--compiler COMPILER] [--[no-]terminal] [--stack-yaml STACK-YAML]
             COMMAND|FILE

Changing ghci to runghc runs it as expected. Running stack ghci ~/junk/unbound-bug.hs results in Error parsing targets: Directory not found: /home/enolan/junk/unbound-bug.hs regardless of if the file has runghc or ghci in it. Ideally, both stack ghci $FILENAME and writing ghci instead of runghc in the header comment would open the interpreter shell.

Version 1.1.2, Git revision cebe10e845fed4420b6224d97dcabf20477bbd4b (3646 commits) x86_64 hpack-0.14.0

[harendra-kumar]

Interpreter does not allow commands other than runghc. I contemplated allowing ghci case in interpreter but was wondering if someone would need this and here you are. I will happily enable this.

Another problem is that stack ghci does not work as you would think on single files. You can use stack exec ghci though.

[enolan]

Cool!

On Wed, Aug 17, 2016, 8:45 PM Harendra Kumar notifications@github.com
wrote:

Interpreter does not allow commands other than runghc. I contemplated
allowing ghci case in interpreter but was wondering if someone would need
this and here you are. I will happily enable this.

Another problem is that stack ghci does not work as you would think on
single files. You can use stack exec ghci though.

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[harendra-kumar]

Fixed via commit d5b8c6e . Use exec ghci instead of ghci in the shebang comment.