arjaneising · November 26, 2012 22:10 · Nov 26, 2012 · Nov 26, 2012
diff --git a/shift.rb b/shift.rb
@@ -9,10 +9,15 @@ def new_filename(num, filename)
 end
 
 files = Dir['*']
-shift = ARGV.first
+shift = false
 dry_run = false
 ARGV.each do |arg|
     dry_run = true if arg == '-n'
+    shift = $& if arg.to_s =~ /^[0-9]{1,4}$/
+end
+unless shift
+    puts 'invalid parameter; exiting'
+    exit 1
 end
 puts 'DRY RUN' if dry_run
 

diff --git a/shift.rb b/shift.rb
@@ -0,0 +1,37 @@
+def new_filename(num, filename)
+    if num.to_i < 9
+        "_0#{num.to_i+1}#{filename}"
+    elsif num.to_i < 99
+        "_#{num.to_i+1}#{filename}"
+    else
+        "#{num.to_i+1}#{filename}"
+    end
+end
+
+files = Dir['*']
+shift = ARGV.first
+dry_run = false
+ARGV.each do |arg|
+    dry_run = true if arg == '-n'
+end
+puts 'DRY RUN' if dry_run
+
+LESS_HUNDRED = /^_([0-9]{2})(.*)/
+HUNDRED_PLUS = /^([1-9][0-9]{2})(.*)/
+
+queued_moves = []
+[LESS_HUNDRED, HUNDRED_PLUS].each do |regex|
+    files.select { |file| regex =~ file }.each do |file|
+        regex =~ file
+        if $1.to_i > shift.to_i
+            puts "renaming `#{file}` to `#{new_filename($1, $2)}`"
+            File.rename file, "__temp_#{$1}" unless dry_run
+            queued_moves << ["__temp_#{$1}", new_filename($1, $2)]
+        end
+    end
+end
+unless dry_run
+    queued_moves.each do |move|
+        File.rename move[0], move[1]
+    end
+end
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