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/* Header rename functions                              -*- mfl -*-
   Copyright (C) 2010-2011, 2015 Sergey Poznyakoff

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

module 'header_rename'.

func header_rename(string name, string newname; number idx)
do
  if not defined(idx)
    set idx 1
  fi
  number msg current_message()
  number count message_header_count(msg)
  string lc tolower(name)
  loop for number i 1,
       while i < count,
       set i i + 1
  do
    if tolower(message_nth_header_name(msg, i)) == lc
      set idx idx - 1
      if idx == 0
        header_replace_nth(i, newname, message_nth_header_value(msg, i))
	return
      fi
    fi
  done
done

/* If PREFIX is specified, rename all headers named NAME to
   PREFIXNAME.  Otherwise, remove all such headers. */
func header_prefix_all(string pattern; string prefix)
do
  number msg current_message()
  number count message_header_count(msg)
  string lc tolower(pattern)
  loop for number i count,
       while i >= 1,
       set i i - 1
  do
    string name message_nth_header_name(msg, i)
    if tolower(name) == lc
      if defined(prefix)
        header_replace_nth(i, prefix.name, message_nth_header_value(msg, i))
      else
        header_delete_nth(i)
      fi
    fi
  done
done

/* If PREFIX is specified, rename all headers matching PATTERN to
   PREFIXNAME.  Otherwise, remove them. */
func header_prefix_pattern(string pattern; string prefix)
do
  number msg current_message()
  number count message_header_count(msg)
  loop for number i 1,
       while i <= count,
       set i i + 1
  do
    string name message_nth_header_name(msg, i)
    if name fnmatches pattern
      if defined(prefix)
        header_replace_nth(i, prefix.name, message_nth_header_value(msg, i))
      else
        header_delete_nth(i)
      fi
    fi
  done
done

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