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+#! /usr/bin/env false
+
+use v6.c;
+use MONKEY-TYPING;
+
+# Don't use precompilation in order to not conflict with other MONKEY-TYPING
+# modules.
+no precompilation;
+
+augment class Hash
+{
+ #| Merges a second hash into the hash the method is called on. Hash given as
+ #| the argument is not modified.
+ #| Traverses the full tree, replacing items in the original hash with the
+ #| hash given in the argument. Does not replace positional elements by default,
+ #| and instead appends the items from the supplied hash's array to the original
+ #| hash's array. The object type of positionals is not retained and instead
+ #| becomes an Array type.
+ #| Use :no-append-array to replace arrays and positionals instead, which will
+ #| also retain the original type and not convert to an Array
+ multi method merge (Hash:U: %b, Bool:D :$no-append-array = False) {
+ warn "Cannot merge an undefined Hash!";
+ return %b;
+ }
+
+ multi method merge (Hash:D: %b, Bool:D :$no-append-array = False)
+ {
+ hashmerge self, %b, :$no-append-array;
+ }
+
+ sub hashmerge (%merge-into, %merge-source, Bool:D :$no-append-array)
+ {
+ for %merge-source.keys -> $key {
+ if %merge-into{$key}:exists {
+ given %merge-source{$key} {
+ when Hash {
+ hashmerge %merge-into{$key},
+ %merge-source{$key},
+ :$no-append-array;
+ }
+ when Positional {
+ %merge-into{$key} = $no-append-array
+ ?? %merge-source{$key}
+ !!
+ do {
+ my @a;
+ @a.push: $_ for %merge-into{$key}.list;
+ @a.push: $_ for %merge-source{$key}.list;
+ @a;
+ }
+ }
+ # Non-positionals, so strings or Bools or whatever
+ default { %merge-into{$key} = %merge-source{$key} }
+ }
+ } else {
+ %merge-into{$key} = %merge-source{$key};
+ }
+ }
+ %merge-into;
+ }
+}
+
+# vim: ft=perl6 ts=4 sw=4 et