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tools/wonko_ruby_imapsync

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+#!/usr/bin/env ruby
+require 'net/imap'
+#
+# http://wonko.com/article/554
+#
+# Gilles LAMIRAL: Your Ruby code is nice. Is it GPL? Can I make a reference 
+# to it in the imapsync distribution?
+#
+# Wonko : Please consider this code public domain (and unsupported).
+# You're more than welcome to refer to it if you'd like.
+#
+#
+# Source server connection info.
+SOURCE_HOST = 'mail.example.com'
+SOURCE_PORT = 143
+SOURCE_SSL  = false
+SOURCE_USER = 'username'
+SOURCE_PASS = 'password'
+
+# Destination server connection info.
+DEST_HOST = 'imap.gmail.com'
+DEST_PORT = 993
+DEST_SSL  = true
+DEST_USER = 'username@gmail.com'
+DEST_PASS = 'password'
+
+# Mapping of source folders to destination folders. The key is the name of the
+# folder on the source server, the value is the name on the destination server.
+# Any folder not specified here will be ignored. If a destination folder does
+# not exist, it will be created.
+FOLDERS = {
+  'INBOX' => 'INBOX',
+  'sourcefolder' => 'gmailfolder'
+}
+
+# Utility methods.
+def dd(message)
+   puts "[#{DEST_HOST}] #{message}"
+end
+
+def ds(message)
+   puts "[#{SOURCE_HOST}] #{message}"
+end
+
+# Connect and log into both servers.
+ds 'connecting...'
+source = Net::IMAP.new(SOURCE_HOST, SOURCE_PORT, SOURCE_SSL)
+
+ds 'logging in...'
+source.login(SOURCE_USER, SOURCE_PASS)
+
+dd 'connecting...'
+dest = Net::IMAP.new(DEST_HOST, DEST_PORT, DEST_SSL)
+
+dd 'logging in...'
+dest.login(DEST_USER, DEST_PASS)
+
+# Loop through folders and copy messages.
+FOLDERS.each do |source_folder, dest_folder|
+  # Open source folder in read-only mode.
+  begin
+    ds "selecting folder '#{source_folder}'..."
+    source.examine(source_folder)
+  rescue => e
+    ds "error: select failed: #{e}"
+    next
+  end
+  
+  # Open (or create) destination folder in read-write mode.
+  begin
+    dd "selecting folder '#{dest_folder}'..."
+    dest.select(dest_folder)
+  rescue => e
+    begin
+      dd "folder not found; creating..."
+      dest.create(dest_folder)
+      dest.select(dest_folder)
+    rescue => ee
+      dd "error: could not create folder: #{e}"
+      next
+    end
+  end
+  
+  # Build a lookup hash of all message ids present in the destination folder.
+  dest_info = {}
+  
+  dd 'analyzing existing messages...'
+  dest.uid_fetch(dest.uid_search(['ALL']), ['ENVELOPE']).each do |data|
+    dest_info[data.attr['ENVELOPE'].message_id] = true
+  end
+  
+  # Loop through all messages in the source folder.
+  source.uid_fetch(source.uid_search(['ALL']), ['ENVELOPE']).each do |data|
+    mid = data.attr['ENVELOPE'].message_id
+
+    # If this message is already in the destination folder, skip it.
+    next if dest_info[mid]
+    
+    # Download the full message body from the source folder.
+    ds "downloading message #{mid}..."
+    msg = source.uid_fetch(data.attr['UID'], ['RFC822', 'FLAGS',
+        'INTERNALDATE']).first
+    
+    # Append the message to the destination folder, preserving flags and
+    # internal timestamp.
+    dd "storing message #{mid}..."
+    dest.append(dest_folder, msg.attr['RFC822'], msg.attr['FLAGS'],
+        msg.attr['INTERNALDATE'])
+  end
+  
+  source.close
+  dest.close
+end
+
+puts 'done'
+