[project @ 2005-11-04 15:48:25 by simonmar]
- Add support for the GHC_PACKAGE_PATH environment variable, which specifies a :-separated (;-separated on Windows) list of package database files. If the list ends in : (; on Windows), then the normal user and global databases are added. GHC_PACKAGE_PATH is searched left-to-right for packages, like $PATH, but unlike -package-conf flags, which are searched right-to-left. This isn't ideal, but it seemed the least worst to me (command line flags always override right-to-left (except -i), whereas the PATH environment variable overrides left-to-right, I chose to follow the environment variable convention). I can always change it if there's an outcry. - Rationalise the interpretation of --user, --global, and -f on the ghc-pkg command line. The story is now this: --user and --global say which package database to *act upon*, they do not change the shape of the database stack. -f pushes a database on the stack, and also requests that the specified database be the one to act upon, for commands that modify the database. If a database is already on the stack, then -f just selects it as the one to act upon. This means you can have a bunch of databases in GHC_PACKAGE_PATH, and use -f to select the one to modify.
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