Encode the folder in UTF7

Patch from René 'Necoro' Neumann <lists@necoro.eu>, who writes:
> I wanted to wrap the folder name in a call to
> "Net::IMAP::encode_utf7"
> to allow special characters like umlauts in the folder name (see the
> attached patch).
>
> Problem is, that the encode_utf7 (and the decode_utf7 FWIW) uses the
> 'String::force_encoding' method, which some googling shows to be in
> Ruby1.9 but not 1.8.

1 files changed, 17 insertions, 1 deletions

diff --git a/lib/feed2imap/config.rb b/lib/feed2imap/config.rb
index 5e339c7..6c3654b 100644
--- a/lib/feed2imap/config.rb
+++ b/lib/feed2imap/config.rb
@@ -109,7 +109,8 @@ class ConfigFeed
     @name = f['name']
     @url = f['url']
     @url.sub!(/^feed:/, '') if @url =~ /^feed:/
-    @imapaccount, @folder = imapaccount, folder
+    @imapaccount = imapaccount
+    @folder = encode_utf7 folder
     @freq = f['min-frequency']
 
     @always_new = false
@@ -136,4 +137,19 @@ class ConfigFeed
     return true if @freq.nil?
     return (lastcheck + @freq * 3600) < Time::now
   end
+
+  def encode_utf7(s)
+    if "foo".respond_to?(:force_encoding)
+      return Net::IMAP::encode_utf7 s
+    else
+      # this is a copy of the Net::IMAP::encode_utf7 w/o the force_encoding
+      return s.gsub(/(&)|([^\x20-\x7e]+)/u) {
+        if $1
+          "&-"
+        else
+          base64 = [$&.unpack("U*").pack("n*")].pack("m")
+          "&" + base64.delete("=\n").tr("/", ",") + "-"
+        end }
+    end
+  end
 end