Don't let blank lines force indent to zero

lib/unindentable.rb

@@ -10,14 +10,24 @@ def unindent(string)
   # Returns the indent level of a string (with multiple lines)
   def find_minimum_indent(string)
     indents = []
-    string.each_line { |l| indents << l.index(/[^ ]/) }
+    string.each_line do |line|
+      unless line == "\n"
+        indents << line.index(/[^ ]/)
+      end
+    end
     indents.min
   end
 
   # Trims the leftmost n characters from each line of a string
   def left_trim(string, n)
     new_string = ""
-    string.each_line { |l| new_string << l.slice(n, l.length) }
+    string.each_line do |line|
+      new_string << if line == "\n"
+        "\n"
+      else
+        line.slice(n, line.length)
+      end
+    end
     new_string
   end
 

spec/unindentable_spec.rb

@@ -63,4 +63,13 @@
     x.should == "The first line\n  The second line\n  \nThe fourth line\n"
   end
 
+  it "should not let blank lines break the indent" do
+    x = unindent <<-BLOCK
+      The first line
+
+      The third line
+    BLOCK
+    x.should == "The first line\n\nThe third line\n"
+  end
+
 end