Fossil

	set myproject   $project
	set mytype      $cstype
	set mytypeobj   ::vc::fossil::import::cvs::project::rev::${cstype}
	set mysrcid	$srcid
	set myitems     $items
	set mypos       {} ; # Commit location is not known yet.



	# Keep track of the generated changesets and of the inverse
	# mapping from items to them.
	lappend mychangesets   $self
	lappend mytchangesets($cstype) $self
	set     myidmap($myid) $self
	foreach iid $items { lappend mytitems [list $cstype $iid] }

	MapItems $cstype $items
	return
    }

    destructor {
	# The main thing is to keep track of the itemmap and remove
	# the object from it. The lists of changesets (mychangesets,
	# mytchangesets) are not maintained (= reduced), for the
	# moment. We may be able to get rid of this entirely, at least
	# for (de)construction and pass InitCSets.

	UnmapItems $mytype $myitems






	return
    }

    method str {} {
	set str    "<"
	set detail ""
	if {[$mytypeobj bysymbol]} {

	return [array get tmp]
    }

    method breakinternaldependencies {cv} {
	upvar 1 $cv counter
	log write 14 csets {[$self str] BID}
	vc::tools::mem::mark
	##
	## NOTE: This method, maybe in conjunction with its caller
	##       seems to be a memory hog, especially for large
	##       changesets, with 'large' meaning to have a 'long list
	##       of items, several thousand'. Investigate where the
	##       memory is spent and then look for ways of rectifying
	##       the problem.
	##

	# This method inspects the changesets for internal
	# dependencies. Nothing is done if there are no

	# such. Otherwise the changeset is split into a set of
	# fragments without internal dependencies, transforming the
	# internal dependencies into external ones. The new changesets
	# generated from the fragment information are added to the
	# list of all changesets.

	# The code checks only successor dependencies, as this
	# automatically covers the predecessor dependencies as well (A
	# successor dependency a -> b is also a predecessor dependency
	# b -> a).

	# Array of dependencies (parent -> child). This is pulled from
	# the state, and limited to successors within the changeset.

	array set breaks {}

	set fragments [BreakDirectDependencies $myitems breaks]

	if {![llength $fragments]} { return {} }

	return [$self CreateFromFragments $fragments counter breaks]

		DELETE FROM changeset   WHERE cid = $myid;
		DELETE FROM csitem      WHERE cid = $myid;
		DELETE FROM cssuccessor WHERE cid = $myid;
	    }
	}

	UnmapItems $mytype $myitems


	set pos                    [lsearch -exact $mychangesets $self]
	set mychangesets           [lreplace       $mychangesets $pos $pos]
	set pos                    [lsearch -exact $mytchangesets($mytype) $self]
	set mytchangesets($mytype) [lreplace       $mytchangesets($mytype) $pos $pos]

	# Return the list of predecessors so that they can be adjusted.

	set newcsets  {}
	set fragments [lsort -index 0 -integer $fragments]

	#puts \t.[join [PRs $fragments] .\n\t.].

	Border [lindex $fragments 0] firsts firste



	integrity assert {$firsts == 0} {Bad fragment start @ $firsts, gap, or before beginning of the range}

	set laste $firste
	foreach fragment [lrange $fragments 1 end] {
	    Border $fragment s e


	    integrity assert {$laste == ($s - 1)} {Bad fragment border <$laste | $s>, gap or overlap}

	    set new [$type %AUTO% $myproject $mytype $mysrcid [lrange $myitems $s $e]]
	    lappend newcsets $new
	    incr counter

            log write 4 csets "Breaking [$self str ] @ $laste, new [$new str], cutting $breaks($laste)"

	    set laste $e
	}

	integrity assert {
	    $laste == ([llength $myitems]-1)
	} {Bad fragment end @ $laste, gap, or beyond end of the range}

    }

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

    proc BreakDirectDependencies {theitems bv} {
	upvar 1 mytypeobj mytypeobj self self $bv breaks




	array set dependencies {}

	$mytypeobj internalsuccessors dependencies $theitems
	if {![array size dependencies]} {
	    return {}
	} ; # Nothing to break.

	log write 5 csets ...[$self str].......................................................
	vc::tools::mem::mark