7 files changed, 161 insertions, 0 deletions
diff --git a/challenge-178/arne-sommer/blog.txt b/challenge-178/arne-sommer/blog.txt
new file mode 100644
index 0000000000..458936562d
--- /dev/null
+++ b/challenge-178/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/imaginary-date.html
diff --git a/challenge-178/arne-sommer/raku/business-date b/challenge-178/arne-sommer/raku/business-date
new file mode 100755
index 0000000000..a3efc427d9
--- /dev/null
+++ b/challenge-178/arne-sommer/raku/business-date
@@ -0,0 +1,26 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Str $timestamp, Str $duration);
+
+my ($duration-hour, $duration-min) = $duration.split(".")>>.Int;
+
+$duration-min = $duration-min ?? $duration-min * 6 !! 0;
+
+my ($ymd, $hm) = $timestamp.split(" ");
+
+my $dt = DateTime.new($ymd ~ "T" ~ $hm ~ ":00");
+
+die "Only 09:00-18:00 allowed" if $dt.hour < 9 || $dt.hour == 18 && $dt.minute || $dt.hour > 18;
+
+$dt.=later([days  => $duration-hour div 9, hours => $duration-hour % 9, minutes => $duration-min]);
+
+if $dt.hour < 9
+{
+  $dt.=later(hours => 9);
+}
+elsif $dt.hour == 18 && $dt.minute || $dt.hour > 18
+{
+  $dt.=later(hours => 15);
+}
+
+say $dt.yyyy-mm-dd ~ " " ~ $dt.hh-mm-ss.substr(0,5);
diff --git a/challenge-178/arne-sommer/raku/business-date-int b/challenge-178/arne-sommer/raku/business-date-int
new file mode 100755
index 0000000000..082c0a821b
--- /dev/null
+++ b/challenge-178/arne-sommer/raku/business-date-int
@@ -0,0 +1,22 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Str $timestamp, UInt $duration);
+
+my ($ymd, $hm) = $timestamp.split(" ");
+
+my $dt = DateTime.new($ymd ~ "T" ~ $hm ~ ":00");
+
+die "Only 09:00-18:00 allowed" if $dt.hour < 9 || $dt.hour == 18 && $dt.minute || $dt.hour > 18;
+
+$dt.=later([days => $duration div 9, hours => $duration % 9]);
+
+if $dt.hour < 9
+{
+  $dt.=later(hours => 9);
+}
+elsif $dt.hour == 18 && $dt.minute || $dt.hour > 18
+{
+  $dt.=later(hours => 15);
+}
+
+say $dt.yyyy-mm-dd ~ " " ~ $dt.hh-mm-ss.substr(0,5);
diff --git a/challenge-178/arne-sommer/raku/ch-1.raku b/challenge-178/arne-sommer/raku/ch-1.raku
new file mode 100755
index 0000000000..58e41c8350
--- /dev/null
+++ b/challenge-178/arne-sommer/raku/ch-1.raku
@@ -0,0 +1,30 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (:b(:$base10), :q(:$quater));
+
+die "Specify one of 'base10' or 'quater'" unless one($base10, $quater);
+
+say decimal-to-quater($base10) if $base10;
+say quater-to-decimal($quater) if $quater;
+
+sub quater-to-decimal ($number)
+{
+  my $decimal = 0;
+  my $length  = $number.chars;
+  
+  for ^$length -> $d
+  {
+    $decimal += $number.substr($d, 1) * (2i ** --$length);
+  }
+
+  return $decimal ~~ /(.*)\+0i$/ ?? $decimal.Int !! $decimal;
+}
+
+sub decimal-to-quater ($number)
+{
+  die "Positive integers only, at this time" unless $number ~~ /^\d+$/;
+
+  constant Schroeppel4 = 0xCCCCCCCC;
+
+  return ( ($number + Schroeppel4 ) +^ Schroeppel4 ).base(4);
+}
diff --git a/challenge-178/arne-sommer/raku/ch-2.raku b/challenge-178/arne-sommer/raku/ch-2.raku
new file mode 100755
index 0000000000..a3efc427d9
--- /dev/null
+++ b/challenge-178/arne-sommer/raku/ch-2.raku
@@ -0,0 +1,26 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Str $timestamp, Str $duration);
+
+my ($duration-hour, $duration-min) = $duration.split(".")>>.Int;
+
+$duration-min = $duration-min ?? $duration-min * 6 !! 0;
+
+my ($ymd, $hm) = $timestamp.split(" ");
+
+my $dt = DateTime.new($ymd ~ "T" ~ $hm ~ ":00");
+
+die "Only 09:00-18:00 allowed" if $dt.hour < 9 || $dt.hour == 18 && $dt.minute || $dt.hour > 18;
+
+$dt.=later([days  => $duration-hour div 9, hours => $duration-hour % 9, minutes => $duration-min]);
+
+if $dt.hour < 9
+{
+  $dt.=later(hours => 9);
+}
+elsif $dt.hour == 18 && $dt.minute || $dt.hour > 18
+{
+  $dt.=later(hours => 15);
+}
+
+say $dt.yyyy-mm-dd ~ " " ~ $dt.hh-mm-ss.substr(0,5);
diff --git a/challenge-178/arne-sommer/raku/quater-imaginary-base b/challenge-178/arne-sommer/raku/quater-imaginary-base
new file mode 100755
index 0000000000..58e41c8350
--- /dev/null
+++ b/challenge-178/arne-sommer/raku/quater-imaginary-base
@@ -0,0 +1,30 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (:b(:$base10), :q(:$quater));
+
+die "Specify one of 'base10' or 'quater'" unless one($base10, $quater);
+
+say decimal-to-quater($base10) if $base10;
+say quater-to-decimal($quater) if $quater;
+
+sub quater-to-decimal ($number)
+{
+  my $decimal = 0;
+  my $length  = $number.chars;
+  
+  for ^$length -> $d
+  {
+    $decimal += $number.substr($d, 1) * (2i ** --$length);
+  }
+
+  return $decimal ~~ /(.*)\+0i$/ ?? $decimal.Int !! $decimal;
+}
+
+sub decimal-to-quater ($number)
+{
+  die "Positive integers only, at this time" unless $number ~~ /^\d+$/;
+
+  constant Schroeppel4 = 0xCCCCCCCC;
+
+  return ( ($number + Schroeppel4 ) +^ Schroeppel4 ).base(4);
+}
diff --git a/challenge-178/arne-sommer/raku/quater-imaginary-base-stubbed b/challenge-178/arne-sommer/raku/quater-imaginary-base-stubbed
new file mode 100755
index 0000000000..9d7b479cb7
--- /dev/null
+++ b/challenge-178/arne-sommer/raku/quater-imaginary-base-stubbed
@@ -0,0 +1,26 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (:b(:$base10), :q(:$quater));
+
+die "Specify one of 'base10' or 'quater'" unless one($base10, $quater);
+
+say decimal-to-quater($base10) if $base10;
+say quater-to-decimal($quater) if $quater;
+
+sub quater-to-decimal ($number)
+{
+  my $decimal = 0;
+  my $length  = $number.chars;
+  
+  for ^$length -> $d
+  {
+    $decimal += $number.substr($d, 1) * (2i ** --$length);
+  }
+
+  return $decimal ~~ /(.*)\+0i$/ ?? $decimal.Int !! $decimal;
+}
+
+sub decimal-to-quater ($number)
+{
+  !!! "Not implemented yet"
+}