1 files changed, 26 insertions, 0 deletions
diff --git a/challenge-120/abigail/lua/ch-2.lua b/challenge-120/abigail/lua/ch-2.lua
new file mode 100644
index 0000000000..31c18d0b5e
--- /dev/null
+++ b/challenge-120/abigail/lua/ch-2.lua
@@ -0,0 +1,26 @@
+#!/opt/local/bin/lua
+
+--
+-- See ../README.md
+--
+
+--
+-- Run as: lua ch-2.lua < input-file
+--
+
+local DIFF_PER_MINUTE =  11
+local MIN_PER_HOUR    =  60
+local FULL_CIRCLE     = 720
+
+for line in io . lines () do
+    local _, _, hours, minutes = line : find ("([0-9][0-9]):([0-9][0-9])")
+    hours   = tonumber (hours)
+    minutes = tonumber (minutes)
+    local angle = (DIFF_PER_MINUTE * (hours * MIN_PER_HOUR + minutes)) %
+                                              FULL_CIRCLE
+    if 2 * angle >= FULL_CIRCLE
+    then angle = FULL_CIRCLE - angle
+    end
+
+    print (angle / 2)
+end