-# We need Pathname to get the real filesystem path
-# of this script (and not, for example, the path of
-# a symlink which points to it.
-require 'pathname'
-
-# This bit of magic adds the parent directory (the
-# project root) to the list of ruby load paths.
-# Thus, our require statements will work regardless of
-# how or from where the script was run.
-executable = Pathname.new(__FILE__).realpath.to_s
-$: << File.dirname(executable) + '/../'
-
-# Load our config file.
-require 'bin/configuration'
-
-# And the necessary classes.
-require 'src/errors.rb'
-require 'src/exit_codes.rb'
-require 'src/dovecot_mailstore'
-require 'src/postfixadmin_db'
-
-dms = DovecotMailstore.new(Configuration::MAIL_ROOT)
-
-pgadb = PostfixadminDb.new(Configuration::DBHOST,
- Configuration::DBPORT,
- Configuration::DBOPTS,
- Configuration::DBTTY,
- Configuration::DBNAME,
- Configuration::DBUSER,
- Configuration::DBPASS)
-
-begin
- # Get the list of accounts according to the filesystem.
- fs_accts = dms.get_accounts_from_filesystem()
-rescue StandardError => e
- puts "There was an error retrieving accounts from the filesystem: #{e.to_s}"
- Kernel.exit(ExitCodes::FILESYSTEM_ERROR)
+# Define a usage string using the program name.
+exe = File.basename($PROGRAM_NAME)
+usage = "#{exe} [prune | rm <target> | mv <src> <dst>]"
+
+# Defaults
+mode_name = 'prune'
+mode = :prune
+
+# Now, if a mode was supplied, it should be in ARGV[0].
+if ARGV.length() > 0
+ mode_names = ['prune', 'rm', 'mv']
+ if mode_names.include?(ARGV.first().downcase()) then
+ # Peel the mode name off the head of the list.
+ mode_name = ARGV.shift()
+ end
+end
+
+if mode_name == 'rm' then
+ mode = :rm
+elsif mode_name == 'mv' then
+ mode = :mv
+end
+
+# Need this before referencing ExitCodes.
+require 'mailshears'
+
+# Since we removed both the executable name and the mode name (if it
+# existed) from ARGV, what remains should be the required
+# arguments.
+if (mode == :prune and (ARGV.length() != 0)) or
+ (mode == :rm and (ARGV.length() < 1)) or
+ (mode == :mv and (ARGV.length() != 2)) then
+ puts "ERROR: missing (or extra) command-line arguments."
+ puts "Usage: #{usage}"
+ Kernel.exit(ExitCodes::BAD_COMMAND_LINE)