#!/usr/bin/ruby
#
# Triggers:
#       jobmerge form-in job "jobmerge.rb %formfile% %user%"
#
# FILL THIS IN OR THIS TRIGGER WILL NOT WORK!

p4port = '1666'            # P4PORT
p4user = 'bruno'           # P4USER
p4passwd = nil             # P4PASSWD

mdate = 'Date'             # Your 'date always' job field

specdepot =  'spec'        # The Depot name of your spec depot
specsuffix = '.p4s'        # The Suffix of your spec depot

# THIS IS OPTIONAL STUFF THAT YOU MAY SET OR IGNORE

accept_yours =             # Accept 'yours' for these fields' conflicts.
        [ 'User' ]
accept_theirs =            # Accept 'theirs' for these fields' conflicts.
        [ ]
ignore_users =             # Accept 'theirs' for these users' conflicts.
        [ 'bruno' ]

# OKAY ALL DONE CONFIGURING, GOOD JOB!

if( ARGV.length < 1 )
    puts 'Dude, where\'s my %formfile%?'
    exit 1
end

formfile = ARGV[0]
user     = ARGV[1]

require "P4"
p4 = P4.new
p4.port = p4port
p4.user = p4user
p4.password = p4passwd
p4.connect
begin
        # Garbage 'job -o' to load jobspec.  Boo.

        p4.fetch_job( 'jobspec' )

        # Now the "yours" spec, from user.

        yours = p4.parse_job( File.open( formfile ).read )
        exit if yours.empty?
        exit if yours['Job'].nil?
        exit if yours[mdate].nil?

        # Now the "theirs" spec, from db.

        theirs = p4.fetch_job( yours['Job'] )
        exit if theirs.empty?
        exit if theirs[mdate].nil?

        # Is yours already up to date?  If so we're done.

        exit if theirs[mdate] == yours[mdate]

        # Now the "base" spec, from depot.

        bpath = '//' + specdepot + '/job/' + yours['Job'] + specsuffix
        bpath += '@' + yours[mdate]
        print = p4.run_print( bpath )
        bspec = ''
        print.each{ |block| bspec += block if block.class == String }
        base = p4.parse_job( bspec )
        exit if base.empty?
        exit if base[mdate] != yours[mdate]

        # Now we do a 3-way merge.

        base.permitted_fields.each do |field|
            yours[field] = theirs[field] if yours[field] == base[field]
            next if theirs[field] == yours[field]
            next if theirs[field] == base[field]

            next if accept_yours.include?( field )

            if accept_theirs.include?( field ) or ignore_users.include?( user )
                yours[field] = theirs[field]
                next
            end

            puts "Warning: conflicting edits made to #{field}!"

            # This would be a good place to try actually merging the
            # differing fields.
            exit
        end

        # And write it back out.

        result = File.open( formfile, 'w' )
        result.write( p4.format_job( yours ) )

rescue P4Exception
        puts 'Jobmerge trigger encountered an error:'
        p4.errors.each { |e| puts( e ) }
ensure
        p4.disconnect
end