Build dependency generator and iterator for perl6
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Analyses the an array of META6.json-ish hashes to determine the required build order and also provides a control mechanism for building as efficiently as possible.


Really only needs an array of { :name, :depends([]) } of all of the dependencies required

depends-channel(%tree, $concurrency = 3)

Returns a Channel you can use for flow control for whatever you're doing.


my %tree = depends-tree(@list-of-metas);
my $flow = depends-channel(%tree);

loop {
  if $flow.poll -> $key {
    # do something with %tree{$k}
    %tree{$k}<promise>.keep; # this is important so the controller
                             # knows it can send the next item to be
                             # built
  if $flow.closed { last }
  sleep .5;

Check out t/build-order.t:32 for a more complex example.


Returns a very simply graphviz dot format string that you can use to write to a file and generate a chart.

attempt-full-dot-gen(%tree, :$force = False)

Will die if $force ~~ False or if which dot does not return the path to graphviz's dot.

This method attempts to generate the dot file, runs dot -T png -o <tmp-file.png> <> and returns the string path to the png file.