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/usr/bin/smew is in mew-beta-bin 7.0.50~6.7+0.20150818-1.

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The actual contents of the file can be viewed below.

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#!/usr/bin/env ruby
#
# smew.rb: Lookuping Message-ID: DB with Sqlite3
#

begin
  require 'rubygems'
  gem 'sqlite3-ruby'
rescue LoadError
end
require 'sqlite3'

################################################################
##
## DB search
##

def select_by_id(hash, db, id, mydir)
  ret = nil
  db.execute("SELECT * FROM mew WHERE (mew.id = ?);", id) do |ent|
    if push_results(hash, ent, mydir)
      ret = ent
    end
  end
  return ret
end

def select_by_parid(hash, db, id, mydir)
  ret = []
  db.execute("SELECT * FROM mew WHERE (mew.parid = ?);", id) do |ent|
    if push_results(hash, ent, mydir)
      ret.push(ent)
    end
  end
  return ret
end

################################################################
##
## Results
##

def push_results(hash, ent, mydir)
  if hash.key?(ent['id'])
    if File.dirname(ent['path']) == mydir
      hash.delete(ent['id'])
      hash[ent['id']] = ent
    end
    return nil
  else
    hash[ent['id']] = ent
    return true
  end
end

def print_results(hash)
  fin = hash.to_a.sort!{|a,b| a[1]['date'] <=> b[1]['date']}
  fin.each do |a|
    puts a[1]['path']
  end
end

################################################################
##
## Search
##

def search_me(hash, db, myid, mydir)
  ent = select_by_id(hash, db, myid, mydir)
  exit unless ent
  return ent
end

def search_ancestors(hash, db, parid, mydir)
  until parid == ''
    ent = select_by_id(hash, db, parid, mydir)
    break unless ent
    parid = ent['parid']
  end
end

def search_descendants(hash, db, myid, mydir)
  parents = select_by_parid(hash, db, myid, mydir)
  while parents != []
    children = []
    parents.each do |ent|
      children += select_by_parid(hash, db, ent['id'], mydir)
    end
    parents = children
  end
end

def search_child(hash, db, myid, mydir)
  parents = select_by_parid(hash, db, [myid], mydir)
  exit unless parents != []
  return parents[0]
end

################################################################
##
## Main
##

require 'optparse'

opts = {}
OptionParser.new {|opt|
  begin
    opt.on('-p', 'search a parent message only') {|v| opts[:p] = v }
    opt.on('-c', 'search a child message only') {|v| opts[:c] = v }
    opt.parse!(ARGV)
  rescue OptionParser::ParseError => e
    puts opt
    exit
  end
}

myid = ARGV[0]
mydb = ARGV[1] || File.expand_path('~/Mail/id.db')
mydir = ARGV[2]
db = SQLite3::Database.new(mydb)
db.results_as_hash = true

hash = {}

begin
  if opts[:p]
    my = search_me(hash, db, myid, mydir)
    puts my['path'];
  elsif opts[:c]
    my = search_child(hash, db, myid, mydir)
    puts my['path'];
  else
    my = search_me(hash, db, myid, mydir)
    search_ancestors(hash, db, my['parid'], mydir)
    search_descendants(hash, db, myid, mydir)
    print_results(hash)
  end
ensure
  db.close
end

# Copyright (C) 2008 Mew developing team.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the team nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.