Skip to content
  • claus.reinke@talk21.com's avatar
    FIX #1839, #1463, by supporting ghc-pkg bulk queries with substring matching · 68f7cd16
    claus.reinke@talk21.com authored
       - #1839 asks for a ghc-pkg dump feature, #1463 for the ability
         to query the same fields in several packages at once.
    
       - this patch enables substring matching for packages in 'list',
         'describe', and 'field', and for modules in find-module. it
         also allows for comma-separated multiple fields in 'field'.
         substring matching can optionally ignore cases to avoid the
         rather unpredictable capitalisation of packages.
    
       - the patch is not quite as full-featured as the one attached
         to #1839, but avoids the additional dependency on regexps.
         open ended substrings are indicated by '*' (only the three
         forms prefix*, *suffix, *infix* are supported)
    
       - on windows, the use of '*' for package/module name globbing
         leads to conflicts with filename globbing: by default, windows
         programs are self-globbing, and bash adds another level of
         globbing on top of that. it seems impossible to escape '*'
         from both levels of globbing, so we disable default globbing
         for ghc-pkg and ghc-pkg-inplace. users of bash will still
         have filename globbing available, users of cmd won't.
    
       - if it is considered necessary to reenable filename globbing
         for cmd users, it should be done selectively, only for
         filename parameters. to this end, the patch includes a
         glob.hs program which simply echoes its parameters after
         filename globbing. see the commented out glob command in
         Main.hs for usage or testing.
    
       - this covers both tickets, and permits for the most common
         query patterns (finding all packages contributing to the
         System. hierarchy, finding all regex or string packages,
         listing all package maintainers or haddock directories,
         ..), which not only i have wanted to have for a long time.
    
         examples (the quotes are needed to escape shell-based
         filename globbing and should be omitted in cmd.exe):
    
           ghc-pkg list '*regex*' --ignore-case
           ghc-pkg list '*string*' --ignore-case
           ghc-pkg list '*gl*' --ignore-case
           ghc-pkg find-module 'Data.*'
           ghc-pkg find-module '*Monad*'
           ghc-pkg field '*' name,maintainer
           ghc-pkg field '*' haddock-html
           ghc-pkg describe '*'
    
    68f7cd16