trasherdk/sieve

Sieve Script Editor

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Snippet: How to change a message's subject in a Sieve rule

It seems there is no standardised way to directly prepend or append a string to a message's Subject header, but there is a workaround using the editheaders and variables extensions:

require "editheader";
require "variables";

# Match/select your message as you see fit
if header :contains "List-Id" ["<foo.lists.example.net>"]
{
    # Match the entire subject ...
    if header :matches "Subject" "*" {
        # ... to get it in a match group that can then be stored in a variable:
        set "subject" "${1}";
    }

    # We can't "replace" a header, but we can delete (all instances of) it and
    # re-add (a single instance of) it:
    deleteheader "Subject";
    # Append/prepend as you see fit
    addheader :last "Subject" "[Foo-List] ${subject}";
    # Note that the header is added ":last" (so it won't appear before possible
    # "Received" headers).
}

Source: https://superuser.com/a/1502589

And my actual use-case:

require ["body","fileinto", "regex", "variables","editheader"];

if header :contains "subject" ["(Issue #","(PR #"] {
  # Match the entire subject ...
  if header :matches "Subject" "*" {
    # ... to get it in a match group that can then be stored in a variable:
    set "subject" "${1}";
  }
  # We can't "replace" a header, but we can delete (all instances of) it and
  # re-add (a single instance of) it:
  # Append/prepend as you see fit
  # Note that the header is added ":last" (so it won't appear before possible
  # "Received" headers).

  # Closed #873.
  if body :raw :contains "Closed #" {
    deleteheader "Subject";
    addheader :last "Subject" "(Closed) ${subject}";
  }
  # Merged #310
  if body :raw :contains "Merged #" {
    deleteheader "Subject";
    addheader :last "Subject" "(Merged) ${subject}";
  }
}