a sweet little TODO comment extractor

$ <installer ~/work/hobbies/parrot/languages/rakudo/perl6 -e 'while !$*IN.eof {\
  my $line = $*IN.readline; if $line ~~ / \# \ [XXX|TODO|RAKUDO] / { say \
  "== Line ", $*IN.ins; while $line ~~ / \# / { say $line; last if $*IN.eof;\
  $line = $*IN.readline; }; say ""; } }'
== Line 99
        # TODO: Maybe just test everything installed?

== Line 108
        # TODO: Also need to check that projects are actually installed.

== Line 116
        # RAKUDO: Doesn't support any other way to change the current working
        #         directory. Improvising.

== Line 124
        # RAKUDO: Can't really figure out how to set environment variables
        #         so they're visible by later commands. Doing like this
        #         instead.

== Line 136
# TODO: This sub should probably recursively show dependencies, and in such
#       a way that a dependency found twice by different routes is only
#       mentioned the second time -- its dependencies are not shown.

== Line 166
    # TODO: Though the below traversal works, it seems much cooler to do builds
    #       as soon as possible. Right now, in a dep tree looking like this:
    #       :A[ :B[ 'C', 'D' ], 'E' ], we download A-B-E-C-D and then build
    #       D-C-E-B-A. Though this works, one could conceive of a download
    #       preorder A-B-C-D-E and a build postorder C-D-B-E-A.
    #       Those could even be interspersed build-soonest, making it
    #       dA-dB-dC-bC-bD-bB-dE-bE-bA.

== Line 201
        # TODO: It seems we can do better than this. A failed download does
        #       not invalidate a whole installation process, only the
        #       dependency tree in which it is a part. Passing information
        #       upwards with exceptions would provide excellent error
        #       diagnostics (either it failed because it wasn't found, or
        #       because dependencies couldn't be installed).

== Line 243
    # RAKUDO: Doesn't support any other way to change the current working
    #         directory. Improvising.

== Line 253
    # RAKUDO: Can't really figure out how to set environment variables
    #         so they're visible by later commands. Doing like this
    #         instead.

== Line 261
    # XXX: Need to have error handling here, and not continue if things go
    #      haywire with the build. However, a project may not have a
    #      Makefile.PL or Configure.p6, and this needs to be considered
    #      a successful [sic] outcome.

== Line 294
# XXX: Oops, it's inconsistent that this sub takes a project name while
#      get-deps takes a file name. Should fix one of them; and since this one
#      feels weird with a file name, maybe get-deps should take a project
#      name too.

== Line 300
    # TODO: Make this one find the deps of the deps, and so on. We're off the
    #       hook for now, since there are no known deps of deps.

== Line 335
# XXX: Removed all comment-handling code from the p6 version of this sub,
#      on the theory that less code means less maintenance. Should we ever
#      want to write back to the config.proto file from within this script,
#      we'll need to add the comment-handling code back.

== Line 341
    # RAKUDO: Oslo doesn't have lines; have to wait till next month...