inconsistent 'ghc --help" message

[guest]

"ghc --help" produces the following output:

Usage:

ghci [command-line-options-and-input-files]

The kinds of input files that can be given on the command-line

....

Platform: Windows XP SP2 Version: official distribution of 6.6 and 6.6.1 (6.4.2 was ok)

[igloo]

Good spot, thanks!

[igloo]

The logic for printing the ghc and ghci usage messages was inverted; I've fixed that.

However, the ghci case will never actually happen with the current code, as we print a usage message when cli_mode == ShowUsage? and choose the ghci usage message if cli_mode == DoInteractive?.

We should overhaul the option handling, probably using the standard library, so that the same code handles static and dynamic options, and also generates the documentation; the above issue should be fixed at the same time.

[igloo]

Option handling overhaul probably won't happen until 6.10.

[simonmar]

dependent on #1880, which has normal prio, so dropping this one.

[igloo]

Now fixed:

Fri Sep 26 15:05:39 BST 2008  Ian Lynagh <igloo@earth.li>
  * Split ShowVersion etc off into a different type to DoInteractive etc
  This fixes trac #1348 (ghci --help gave ghc's help), and also tidies
  things up a bit. Things would be even tidier if the usage.txt files were
  put into a .hs file, so that ShowUsage wouldn't need to be able to find
  the libdir.