Artifact 5bbb1492868c7bca67d2173b95c2df4ce213ce95

File tools/cvs2fossil/lib/c2f_pbreakacycle.tcl part of check-in [de4cff4142] - Extended changeset class with in-memory database mapping from changeset ids to the proper object, and extended the objects with position information and associated accessors. Extended pass 8 to load the commit order computed in pass 6, this is stored in the new position slot of changesets, and an inverted index mapping from position to changeset at that position. by aku on 2007-11-22 03:21:43.

## -*- tcl -*-
# # ## ### ##### ######## ############# #####################
## Copyright (c) 2007 Andreas Kupries.
#
# This software is licensed as described in the file LICENSE, which
# you should have received as part of this distribution.
#
# This software consists of voluntary contributions made by many
# individuals.  For exact contribution history, see the revision
# history and logs, available at http://fossil-scm.hwaci.com/fossil
# # ## ### ##### ######## ############# #####################

## Pass VIII. This is the final pass for breaking changeset dependency
## cycles. The two previous passes broke cycles covering revision and
## symbol changesets, respectively. This pass now breaks any remaining
## cycles each of which has to contain at least one revision and at
## least one symbol changeset.

# # ## ### ##### ######## ############# #####################
## Requirements

package require Tcl 8.4                                   ; # Required runtime.
package require snit                                      ; # OO system.
package require struct::list                              ; # Higher order list operations.
package require vc::tools::log                            ; # User feedback.
package require vc::fossil::import::cvs::repository       ; # Repository management.
package require vc::fossil::import::cvs::cyclebreaker     ; # Breaking dependency cycles.
package require vc::fossil::import::cvs::state            ; # State storage.
package require vc::fossil::import::cvs::project::rev     ; # Project level changesets

# # ## ### ##### ######## ############# #####################
## Register the pass with the management

vc::fossil::import::cvs::pass define \
    BreakAllCsetCycles \
    {Break Remaining ChangeSet Dependency Cycles} \
    ::vc::fossil::import::cvs::pass::breakacycle

# # ## ### ##### ######## ############# #####################
## 

snit::type ::vc::fossil::import::cvs::pass::breakacycle {
    # # ## ### ##### ######## #############
    ## Public API

    typemethod setup {} {
	# Define the names and structure of the persistent state of
	# this pass.

	state reading csorder
	return
    }

    typemethod load {} {
	# Pass manager interface. Executed to load data computed by
	# this pass into memory when this pass is skipped instead of
	# executed.
	return
    }

    typemethod run {} {
	# Pass manager interface. Executed to perform the
	# functionality of the pass.

	cyclebreaker precmd   [myproc BreakRetrogradeBranches]
	cyclebreaker savecmd  [myproc SaveOrder]
	cyclebreaker breakcmd [myproc BreakCycle]

	state transaction {
	    LoadCommitOrder
	    cyclebreaker run break-all [myproc Changesets]
	}

	repository printcsetstatistics
	return
    }

    typemethod discard {} {
	# Pass manager interface. Executed for all passes after the
	# run passes, to remove all data of this pass from the state,
	# as being out of date.
	return
    }

    # # ## ### ##### ######## #############
    ## Internal methods

    proc Changesets {} { project::rev all }

    proc LoadCommitOrder {} {
	::variable mycset

	state transaction {
	    foreach {cid pos} [state run { SELECT cid, pos FROM csorder }] {
		set cset [project::rev of $cid]
		$cset setpos $pos
		set mycset($pos) $cset
	    }
	    # Remove the order information now that we have it in
	    # memory, so that we can save it once more, for all
	    # changesets, while breaking the remaining cycles.
	    state run { DELETE FROM csorder }
	}
	return
    }

    # # ## ### ##### ######## #############

    proc BreakRetrogradeBranches {graph} {
    }

    # # ## ### ##### ######## #############

    proc SaveOrder {cset pos} {
    }

    # # ## ### ##### ######## #############

    proc BreakCycle {graph} {
	cyclebreaker break $graph
    }

    # # ## ### ##### ######## #############

    typevariable mycset -array {} ; # Map from commit positions to the
				    # changeset (object ref) at that
				    # position.

    # # ## ### ##### ######## #############
    ## Configuration

    pragma -hasinstances   no ; # singleton
    pragma -hastypeinfo    no ; # no introspection
    pragma -hastypedestroy no ; # immortal

    # # ## ### ##### ######## #############
}

namespace eval ::vc::fossil::import::cvs::pass {
    namespace export breakacycle
    namespace eval breakacycle {
	namespace import ::vc::fossil::import::cvs::cyclebreaker
	namespace import ::vc::fossil::import::cvs::repository
	namespace import ::vc::fossil::import::cvs::state
	namespace eval project {
	    namespace import ::vc::fossil::import::cvs::project::rev
	}
	namespace import ::vc::tools::log
	log register breakacycle
    }
}

# # ## ### ##### ######## ############# #####################
## Ready

package provide vc::fossil::import::cvs::pass::breakacycle 1.0
return