Entries tagged rfc

Related tags: mail-scanning, mutt, tags.

Where troubles melt like lemon drops

Saturday, 1 March 2008

I've been re-reading RFC 2822 again over the weekend, for obvious reasons, and I'm amused I've not noticed this section in the past:

3.6.5. Informational fields

The informational fields are all optional. The "Keywords:" field contains a comma-separated list of one or more words or quoted-strings. The "Subject:" and "Comments:" fields are unstructured fields as defined in section 2.2.1, and therefore may contain text or folding white space.

subject  = "Subject:" unstructured CRLF

comments = "Comments:" unstructured CRLF

keywords = "Keywords:" phrase *("," phrase) CRLF

Now we all know that emails have subjects, but how many people have ever used the Keywords: header, or the Comments: one?

It'd be nice if we could use these fields in mails - I can immediately think of "keywords" as tags, and I'm sure I'm not alone.

I've looked at multiple "tags for mutt" systems, but all of them fall down for the same reason. I can add tags to a mail, and limit a folder to those mails that contain a given tag. But I cannot do that for multiple folders and that makes them useless :(

Has anybody worked on a multi-folder tag system for Mutt? If so pointers welcome. If not I'd be tempted to create one.

I guess implementation would be very simple. There are three caeses:

  • Adding a tag
  • Deleting a tag
  • Finding all messages with agiven tag.

The first two are easy. The second could be done by writing a cronjob to scan messages for Keyword: headers, and writing a simple index. That could then be used to populate an "~/Maildir/.tag-results" folder, via hardlinks, of all matching messages.

Better yet you could pre-populate ~/Maildir/.tag-$foo containing each message with a given tag. Then theres no searching required! (Although your cronjob would need to run often enough when the tag were added to a message it would appear there within a reasonable timeframe.

Update: I've written the indexer now. It works pretty quickly after the initial run, and is quite neat! tagging messages with mutt.

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