AWK, Bash, Lua, Node.js, Perl, Python, Ruby solutions for week 116, part 1

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diff --git a/challenge-116/abigail/ruby/ch-1.rb b/challenge-116/abigail/ruby/ch-1.rb
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+++ b/challenge-116/abigail/ruby/ch-1.rb
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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb < input-file
+#
+
+def make_chain (string, start)
+    if   string == start
+    then return [start]
+    end
+    if   0 == string . index(start)
+    then tail   = string [start . length, string . length]
+         result = make_chain(tail, (start . to_i + 1) . to_s) ||
+                  make_chain(tail, (start . to_i - 1) . to_s)
+         if   result
+         then return result . unshift (start)
+         end
+    end
+    return nil
+
+end
+
+ARGF . each_line do
+    |line|
+    line . strip!
+    for i in 1 .. line . length do
+        start  = line [0, i]
+        result = make_chain(line, start)
+        if   result
+        then puts (result . join (","))
+             break
+        end
+    end
+end