Fixes empty dir bug (#46)

* Add entry to files.yaml to handle .log file

* Update files.yaml, correcting a typo in log entry

* Update on core.rb, to check if the directory is empty

* Update on core.rb, rewrote test, because Travis saw it as an offense

* Update on core.rb, typo in my test

* Update core.rb, switch error message on empty folder

lib/colorls/core.rb

@@ -17,11 +17,15 @@ module ColorLS
     end
 
     def ls
-      @contents = chunkify
-      @max_widths = @contents.transpose.map { |c| c.map(&:length).max }
-      @contents.each { |chunk| ls_line(chunk) }
-      print "\n"
-      display_report if @report
+      if @contents.empty?
+        print "Nothing to show here\n".colorize(:yellow)
+      else
+        @contents = chunkify
+        @max_widths = @contents.transpose.map { |c| c.map(&:length).max }
+        @contents.each { |chunk| ls_line(chunk) }
+        print "\n"
+        display_report if @report
+      end
 
       true
     end
@@ -30,7 +34,6 @@ module ColorLS
 
     def init_contents
       @contents = Dir.entries(@input) - %w[. ..]
-
       @contents.keep_if { |x| !x.start_with? '.' } unless @all
       filter_contents if @show
       sort_contents   if @sort

lib/yaml/files.yaml

@@ -30,6 +30,7 @@ java:     "\ue204"
 js:       "\ue74e"
 json:     "\ue60b"
 less:     "\ue758"
+log:      "\uf18d"
 lua:      "\ue620"
 md:       "\uf48a"
 mustache: "\ue60f"