sweeper/webif/plugin/sweeper/auto.hook

set ::sweeper::cf "/mod/etc/sweeper.conf"
set ::sweeper::dryrun 0
set ::sweeper::lastruleresult 0
set ::sweeper::stack {}
set ::sweeper::dustbin [system dustbin 1]

proc ::sweeper::unknown {cmd args} {
	log "Unknown sweeper rule clause '$cmd'" 0
	return 0
}

######################################################################
# Utility functions

proc ::sweeper::skipdir {e} {
	if {[string match {\[*} [string trimleft $e]]} { return 1 }
	if {$e eq $::sweeper::dustbin} { return 1 }
	return 0
}

# Perform an integer comparison.
proc ::sweeper::intcomp {ref val} {
	lassign $val op num

	if {$num eq ""} {
		set num $op
		set op "=="
	}

	return [expr $ref $op $num]
}

# Substring/pattern check
proc ::sweeper::strcontains {ref val} {
	if {[string first "*" $val] > -1} {
		return [string match -nocase $val $ref]
	}
	return [expr \
	    [string first [string tolower $val] [string tolower $ref]] \
	    >= 0]
}

set ::sweeper::expand_fns {
	replace {2}
	regsub {2}
	asfilename {1 {inline}}
	format {2 {inline}}
	var {1 {inline}}
}

proc ::sweeper::expand_replace {ts &ret search replace} {
	set ret [string map [list $search $replace] $ret]
}

proc ::sweeper::expand_regsub {ts &ret search replace} {
	if {[catch {
		regsub -all -- $search $ret $replace ret
	} msg]} {
		log "Error. %regsub - $msg"
	}
}

proc ::sweeper::expand_asfilename {ts &ret arg} {
	return [system filename $arg]
}

proc ::sweeper::expand_format {ts &ret format arg} {
	if {[catch {set r [format $format $arg]} msg]} {
		log "Error. %format - $msg"
		return "!FORMAT-ERROR!"
	}
	return $r
}

proc ::sweeper::expand_var {ts &ret arg} {
	if {![dict exists $::sweeper::stack $arg]} {
		log "Error. Variable does not exist."
		return ""
	}
	return $::sweeper::stack($arg)
}

# Expand a string containing tokens
proc ::sweeper::expand {ts str {orig ""}} {
	if {[string first "%" $str] == -1} {
		return $str
	}

	# First process any extended functions

	set ret $str
	set fnstack {}
	foreach {fn params} $::sweeper::expand_fns {

		lassign $params numargs flags

		set ls -1
		while {[set s [string first "%$fn" $ret]] >= 0} {
			if {$s <= $ls} break
			set ls $s

			# Fetch the delimiter
			set chpos $($s + [string length $fn] + 1)
			set ch [string index $ret $chpos]

			#log "Found FN $fn @ $s \[delim:$ch@$chpos]" 2

			# Extract the arguments
			set pos $chpos
			set fnargs {}
			while {[llength $fnargs] < $numargs} {
				incr pos
				set e [string first $ch $ret $pos]
				if {$e == -1} {
					log "Error. %$fn - [llength $fnargs]/$numargs parameters found."
					break
				}
				lappend fnargs [::sweeper::expand $ts [
				    string range $ret $pos $($e - 1)] $orig]
				set pos $e
			}

			# s points to the start, e.g. %function
			# e points to the last delimiter or -1 if insufficient
			#    arguments were found.

			if {$e == -1} break

			if {"inline" in $flags} {
				# For inline functions, replace the call with
				# the result.
				set fnret [
				    ::sweeper::expand_$fn $ts ret {*}$fnargs]
				set ret [string replace $ret $s $e $fnret]
			} else {
				# otherwise, queue the function up for later
				# execution.
				lappend fnstack $fn $fnargs
				# and remove the call
				set ret [string replace $ret $s $e]
			}
		}
	}
	#log "FNSTACK: $fnstack" 2

	set glist [ts genrelist]
	set tsg [$ts get genre]
	if {![dict exists $glist $tsg]} {
		set genre "Unknown"
	} else {
		set genre [lindex $glist($tsg) 0]
	}

	set start [$ts get start]
	set timestamp [clock format $start -format "%Y%m%d%H%M%S"]
	set yyyymmdd [string range $timestamp 0 7]
	set hhmm [string range $timestamp 8 11]
	set hh [string range $hhmm 0 1]
	set mm [string range $hhmm 2 3]

	set end [$ts get end]
	set etimestamp [clock format $end -format "%Y%m%d%H%M%S"]
	set eyyyymmdd [string range $etimestamp 0 7]
	set ehhmm [string range $etimestamp 8 11]
	set ehh [string range $ehhmm 0 1]
	set emm [string range $ehhmm 2 3]

	set map [list \
		"%orig" $orig \
		"%title" [$ts get title] \
		"%genre" $genre \
		"%definition" [$ts get definition] \
		"%synopsis" [$ts get synopsis] \
		"%lcn" [$ts get channel_num] \
		"%channel" [$ts get channel_name] \
		"%duration" [$ts duration] \
		\
		"%filename" [$ts get file] \
		"%basename" [$ts bfile] \
		"%folder" [$ts dir] \
		\
		%epname [$ts episode_name] \
		%series [$ts get seriesnum] \
		%episodes [$ts get episodetot] \
		%episode [$ts get episodenum] \
		%epdescr [$ts epstr] \
		\
		"%timestamp" $timestamp \
		"%yyyymmdd" $yyyymmdd \
		"%hhmm" $hhmm \
		"%hh" $hh \
		"%mm" $mm \
		"%year" [clock format $start -format "%Y"] \
		"%month" $(0 + [clock format $start -format "%m"]) \
		"%date" $(0 + [clock format $start -format "%d"]) \
		"%2digityear" [clock format $start -format "%y"] \
		"%2digitmonth" [clock format $start -format "%m"] \
		"%2digitdate" [clock format $start -format "%d"] \
		"%shortday" [clock format $start -format "%a"] \
		"%longday" [clock format $start -format "%A"] \
		"%shortmonth" [clock format $start -format "%b"] \
		"%longmonth" [clock format $start -format "%B"] \
		\
		"%etimestamp" $etimestamp \
		"%eyyyymmdd" $eyyyymmdd \
		"%ehhmm" $ehhmm \
		"%ehh" $ehh \
		"%emm" $emm \
	]

	#log "STACK: $::sweeper::stack" 2

	foreach {key val} $::sweeper::stack {
		#log "MAP(%%$key) -> $val" 2
		set map(%%$key) $val
	}

	#log $map 2

	set ret [string map $map $ret]
	log "  Expanded \[$str] -> \[$ret]" 2

	# Now call any queued extended functions
	foreach {fn fnargs} $fnstack {
		log "   - Calling expand_$fn\($fnargs)" 2
		::sweeper::expand_$fn $ts ret {*}$fnargs
		log "     Result: ($ret)" 2
	}

	return $ret
}

proc ::sweeper::resolvedir {dir} {
	global root

	if {$dir eq ""} { return $root }
	if {[string index $dir 0] eq "/"} { return $dir }
	return "$root/$dir"
}

# returns true if the arguments are actually the same file
proc ::sweeper::samefile {a b} {
	if {![file exists $a] || ![file exists $b]} { return 0 }
	if {[file stat $a] eq [file stat $b]} { return 1 }
	return 0
}

# Move/copy the set of files which make up a recording
proc ::sweeper::moveset {ts dst {op rename}} {
	set file [$ts get file]
	log "${op}set($file) -> $dst" 0

	# Handle alias for rename
	if {$op eq "move"} { set op "rename" }

	# Determine whether this is a cross-filesystem move.
	file stat [$ts get file] sts
	file stat $dst std
	set xfs 0
	if {$sts(dev) ne $std(dev)} {
		log "   Cross-filesystem - will copy then delete." 0
		set xfs 1
	}

	set fset [lsort [$ts fileset]]

	# Handle cross-filesystem (xfs) moves

	if {$xfs && $op eq "rename"} {
		# For cross-filesystem moves, copy the whole file set
		# and then delete the originals if all the copies were
		# successful.
		foreach f $fset {
			set tail [file tail $f]
			if {[::sweeper::samefile $f "$dst/$tail"]} {
				log " Destination is same as source." 0
				return
			}
			if {[catch {file copy $f "$dst/$tail"} msg]} {
				log " ....... $f: XFS copy failed, $msg." 0
				file delete -force "$dst/$tail"
				log " .... Leaving originals intact." 0
				return
			}
			log " ....... $f: OK" 0
		}
		log " Now deleting original files." 0
		foreach f $fset {
			set tail [file tail $f]
			if {[file exists "$dst/$tail"] &&
			    [file size "$dst/$tail"] ==
			    [file size $f]} {
				file tdelete $f
				log " ....... $f: OK" 0
			} else {
				log " ....... $f: ERROR, sizes differ." 0
				return
			}
		}
		if {$op eq "rename"} {
			set ::sweeper::renames($file) "$dst/[file tail $file]"
		}
		return
	}

	# Otherwise - copy or local FS move.

	foreach f $fset {
		set tail [file tail $f]
		if {[::sweeper::samefile $f "$dst/$tail"]} {
			log " Destination is same as source." 0
			return
		}
		if {$op eq "copy" && [file exists "$dst/$tail"]} {
			if {[file size "$dst/$tail"] == [file size $f]} {
				log " ....... $f: Already copied." 2
				continue
			}
			log "Deleting truncated copy $dst/$tail" 0
			file tdelete "$dst/$tail"
		}
		log " ....... $f"
		if {[catch {file $op $f "$dst/[file tail $f]"} msg]} {
			log "$op failed, $msg." 0
			return
		}
	}
	if {$op eq "rename"} {
		set ::sweeper::renames($file) "$dst/[file tail $file]"
	}
}

# Search for a folder with name 'target' under 'root', skipping 'orig'
proc ::sweeper::find {root target orig} {
	foreach e [readdir -nocomplain $root] {
		regsub -all -- {//} "$root/$e" "/" entry
		if {![file isdirectory $entry]} continue
		if {[::sweeper::skipdir $e]} continue
		if {$entry eq $orig} continue

		if {$e eq $target} { return $entry }
		set ret [::sweeper::find $entry $target $orig]
		if {$ret ne ""} { return $ret }
	}
	return ""
}

# Apply a function to all recordings in a directory.
proc ::sweeper::folder_apply {dir callback args} {
	log "Applying action to recordings in $dir" 2
	foreach e [readdir -nocomplain $dir] {
		if {![string match {*.ts} $e]} continue
		set entry "$dir/$e"

		log "+ folder_apply processing $entry" 2

		if {[catch {set ts [ts fetch $entry]} msg]} {
			log "Error reading TS file, $msg" 0
			continue
		}

		if {$ts == "0"} {
			log "Invalid TS file." 2
			continue
		}

		if {[$ts inuse]} {
			log "Recording in use." 2
			continue
		}
		$callback $ts {*}$args
	}
}

proc ::sweeper::rmdir_if_empty {dir} {
	if {$dir eq $::root} return
	if {![system rmdir_if_empty $dir ".series"]} {
		log "Failed to remove directory" 0
		foreach l [system dirblockers $dir] {
			log "Blocking file: $l" 2
		}
	}
}

proc ::sweeper::qrecalc {args} {
	foreach dst $args {
		if {$dst ni $::sweeper::recalc} {
			lappend ::sweeper::recalc $dst
		}
	}
}

######################################################################
# Rule conditions
#
# Parameters:
#	ts	- instance of the ts class for the recording being processed.
#	arg	- arguments provided for the action.
#	folder	- true if the action is being applied to a folder.
#
# Return values:
#
#	0 - condition does not match.
#	1 - condition matched.

proc ::sweeper::lastrule {ts flag folder} {
	return $::sweeper::lastruleresult
}

proc ::sweeper::flag {ts flag folder} {
	return [$ts flag $flag]
}

proc ::sweeper::lcn {ts num folder} {
	return [::sweeper::intcomp [$ts get channel_num] $num]
}

proc ::sweeper::duration {ts dur folder} {
	return [::sweeper::intcomp [$ts duration] $dur]
}

proc ::sweeper::hour {ts str folder} {
	set hour [clock format [$ts get start] -format "%H"]
	return [::sweeper::intcomp $hour $str]
}

proc ::sweeper::now {ts str folder} {
	set now [clock format [clock seconds] -format "%H%M"]
	return [::sweeper::intcomp $now $str]
}

proc ::sweeper::schedduration {ts dur folder} {
	return [::sweeper::intcomp [expr [$ts get scheddur] / 60] $dur]
}

proc ::sweeper::size {ts size folder} {
	return [::sweeper::intcomp [$ts size] $size]
}

proc ::sweeper::age {ts age folder} {
	set recage $(([clock seconds] - [$ts get end]) / 3600)
	log " ... Recording age: $recage" 2
	return [::sweeper::intcomp $recage $age]
}

proc ::sweeper::wage {ts age folder} {
	set recage $(([clock seconds] - [$ts lastmod]) / 3600)
	log " ... Watched age: $recage" 2
	return [::sweeper::intcomp $recage $age]
}

proc ::sweeper::bookmarks {ts bookmarks folder} {
	return [::sweeper::intcomp [$ts get bookmarks] $bookmarks]
}

proc ::sweeper::definition {ts def folder} {
	return [::sweeper::strcontains [$ts get definition] $def]
}

proc ::sweeper::filename {ts str folder} {
	return [::sweeper::strcontains [$ts bfile] $str]
}

proc ::sweeper::title {ts str folder} {
	return [::sweeper::strcontains [$ts get title] $str]
}

proc ::sweeper::synopsis {ts str folder} {
	return [::sweeper::strcontains [$ts get synopsis] $str]
}

proc ::sweeper::guidance {ts str folder} {
	return [::sweeper::strcontains [$ts get guidance] $str]
}

proc ::sweeper::genre {ts genre folder} {
	set glist [ts genrelist]

	set tsg [$ts get genre]
	if {![dict exists $glist $tsg]} { return 0 }

	if {[lindex $glist($tsg) 0] eq $genre} { return 1 }
	return 0
}

proc ::sweeper::fflag {ts flag folder} {
	return [file exists "[$ts dir]/.$flag"]
}

proc ::sweeper::foldername {ts str folder} {
	return [::sweeper::strcontains [$ts dir] $str]
}

proc ::sweeper::fileexists {ts str folder} {
	if {[string index $str 0] ne "/"} {
		set str "[$ts dir]/[::sweeper::expand $ts $str]"
	} else {
		set str [::sweeper::expand $ts $str]
	}
	log "  FILEEXISTS($str)" 2
	return [file isfile $str]
}

proc ::sweeper::direxists {ts str folder} {
	if {[string index $str 0] ne "/"} {
		set str "[$ts dir]/[::sweeper::expand $ts $str]"
	} else {
		set str [::sweeper::expand $ts $str]
	}
	log "  DIREXISTS($str)" 2
	return [file isdirectory $str]
}

proc ::sweeper::series {ts flag folder} {
	if {!$folder} { return 0 }
	set dir [$ts dir]
	if {![file exists "$dir/.series"]} {
		log "Not series folder (nofile)." 2
		return 0
	}

	# Check if the .series entry is a real one versus one created
	# by ts resetnew
	set fd [open "$dir/.series"]
	set bytes [read $fd]
	close $fd
	set sbytes [unpack $bytes -uintle 160 32]
	if {$sbytes == 0} {
		log "Not series folder." 2
		return 0
	}
	return 1
}

proc ::sweeper::varset {ts var folder} {
	return [dict exists $::sweeper::stack $var]
}

proc ::sweeper::textmatch {ts str folder} {
	if {![regexp -- {^([^~]+)~~(.*)$} $str x target pattern]} {
		log "No pattern in textmatch." 1
		return 0
	}
	log "Textmatch ($target) against ($pattern)" 2
	return [::sweeper::strcontains [::sweeper::expand $ts $target] \
	    [::sweeper::expand $ts $pattern]]
}

proc ::sweeper::intmatch {ts str folder} {
	if {![regexp -- {^([^~]+)~~(.*)$} $str x target pattern]} {
		log "No pattern in intmatch." 1
		return 0
	}
	if {[llength [split $pattern " "]] != 2} {
		log "Invalid pattern in numeric comparison." 0
		return 0
	}
	log "Intmatch ($target) against ($pattern)" 2
	return [::sweeper::intcomp [::sweeper::expand $ts $target] $pattern]
}

########################
# Deprecated conditions

proc ::sweeper::lock {ts g folder} {
	if {$g} {
		if {![$ts flag Locked]} {
			log "Locked recording." 0
			$ts lock
		}
	} else {
		if {[$ts flag Locked]} {
			log "Unlocked recording." 0
			$ts unlock
		}
	}
	# Always matches
	return 1
}

######################################################################
# Rule actions.
#
# Parameters:
#	ts	- instance of the ts class for the recording being processed.
#	cmd	- name of action being processed.
#	arg	- arguments provided for the action.
#	folder	- true if the action is being applied to a folder.
#
# Return values:
#
#	0 - continue to next rule
#	1 - stop processing

proc ::sweeper::action_continue {ts cmd arg folder} {
	return 0
}

proc ::sweeper::action_stop {ts cmd arg folder} {
	return 1
}

alias ::sweeper::action_preserve ::sweeper::action_stop

proc ::sweeper::action_move {ts cmd arg folder} {
	set dir [::sweeper::resolvedir [::sweeper::expand $ts $arg]]
	set create 0
	set ocmd $cmd
	if {[string range $cmd end-5 end] eq "create"} {
		set create 1
		set cmd [string range $cmd 0 end-6]
	}
	if {$folder} {
		::sweeper::folder_apply [$ts dir] \
		    ::sweeper::action_move $ocmd $arg 0
		if {$cmd eq "move"} {
			::sweeper::rmdir_if_empty [$ts dir]
		}
		return 1
	}
	if {![file isdirectory $dir]} {
		if {!$create} {
			log " ... No such directory $dir" 2
			return 1
		}
		if {!$::sweeper::dryrun} {
			system mkdir_p $dir
			if {![file isdirectory $dir]} {
				log "Error creating $dir" 1
				return 1
			} else {
				log " ... created $dir" 2
			}
		}
	}
	log "$cmd [$ts get file] to $arg" 0
	if {!$::sweeper::dryrun} {
		::sweeper::moveset $ts $dir $cmd
		::sweeper::qrecalc $dir [$ts dir]
		if {$cmd eq "move"} {
			::sweeper::rmdir_if_empty [$ts dir]
		}
	}
	return 1
}

alias ::sweeper::action_movecreate ::sweeper::action_move
alias ::sweeper::action_copy ::sweeper::action_move
alias ::sweeper::action_copycreate ::sweeper::action_move

proc ::sweeper::action_fileunder {ts cmd arg folder} {
	if {!$folder} {
		log "$cmd action can only be applied to folders."
		return 1
	}
	set dir [::sweeper::resolvedir $arg]
	if {![file isdirectory $dir]} {
		log " ... No such directory $dir" 2
		return 1
	}
	set folder [$ts dir]
	set lfolder [file tail $folder]

	log "  - searching for $lfolder under $dir" 2
	set target [::sweeper::find $dir $lfolder $folder]
	log "    = $target" 2
	if {$target eq "" || ![file isdirectory $target]} {
		log "Did not find directory." 2
		if {$cmd ne "fileundercreate"} { return 1 }
		set target "$dir/$lfolder"
		if {$target eq $folder} {
			log "Skipping merge to self." 2
			return 1
		}
		
		log "Creating $target" 0
		if {!$::sweeper::dryrun} {
			system mkdir_p $target
		}
	}

	if {$::sweeper::dryrun} { return 1 }

	::sweeper::folder_apply $folder [
	    lambda {ts target} {
		::sweeper::moveset $ts $target rename
	    }] $target
	::sweeper::rmdir_if_empty $folder
	::sweeper::qrecalc $folder $target
	return 1
}

alias ::sweeper::action_fileundercreate ::sweeper::action_fileunder

proc ::sweeper::action_renamefile {ts cmd arg folder} {
	set dir [$ts dir]
	if {$folder} {
		::sweeper::folder_apply $dir \
		    ::sweeper::action_renamefile $cmd $arg 0
		return 0
	}
	set arg [system filename [::sweeper::expand $ts $arg [$ts bfile]]]
	set file [$ts get file]
	log "Renaming $file to $arg" 0
	if {[file exists "$dir/$arg.ts"]} {
		log "... ERROR Target already exists" 0
		return 0
	}
	if {[::sweeper::samefile $file "$dir/$arg.ts"]} {
		log "... ERROR Target is the same as source" 0
		return 0
	}
	if {!$::sweeper::dryrun} {
		ts renamegroup $file $arg
		if {[file exists "$dir/$arg.ts"]} {
			$ts setfile "$dir/$arg.ts"
			set ::sweeper::renames($file) "$dir/$arg.ts"
		} else {
			log "... ERROR renamefile somehow failed" 0
		}
	}
	return 0
}

proc ::sweeper::action_settitle {ts cmd arg folder} {
	if {$folder} {
		::sweeper::folder_apply [$ts dir] \
		    ::sweeper::action_settitle $cmd $arg 0
		return 0
	}
	set arg [::sweeper::expand $ts $arg [$ts get title]]
	log "Setting title for [$ts get file] to $arg" 0
	if {!$::sweeper::dryrun} {
		$ts settitle $arg
	}
	return 0
}

proc ::sweeper::action_setguidance {ts cmd arg folder} {
	if {$folder} {
		::sweeper::folder_apply [$ts dir] \
		    ::sweeper::action_setguidance $cmd $arg 0
		return 0
	}
	set arg [::sweeper::expand $ts $arg [$ts get guidance]]
	log "Setting guidance for [$ts get file] to $arg" 0
	if {!$::sweeper::dryrun} {
		$ts setguidance $arg
	}
	return 0
}

proc ::sweeper::action_lock {ts cmd arg folder} {
	if {$folder} {
		::sweeper::folder_apply [$ts dir] \
		    ::sweeper::action_lock $cmd 0 0
		return 0
	}
	if {![$ts flag Locked]} {
		log "Locked [$ts get file]" 0
		if {!$::sweeper::dryrun} {
			$ts lock
		}
	}
	return 0
}

proc ::sweeper::action_unlock {ts cmd arg folder} {
	if {$folder} {
		::sweeper::folder_apply [$ts dir] \
		    ::sweeper::action_unlock $cmd 0 0
		return 0
	}
	if {[$ts flag Locked]} {
		log "Unlocked [$ts get file]" 0
		if {!$::sweeper::dryrun} {
			$ts unlock
		}
	}
	return 0
}

proc ::sweeper::action_delete {ts cmd arg folder} {
	if {$folder} {
		::sweeper::folder_apply [$ts dir] \
		    ::sweeper::action_delete $cmd 0 0
		return
	}
	log "Deleting [$ts get file]" 0
	if {!$::sweeper::dryrun} {
		safe_delete [$ts get file] sweeper
	}
	return 1
}

proc ::sweeper::action_log {ts cmd arg folder} {
	if {$folder} {
		::sweeper::folder_apply [$ts dir] \
		    ::sweeper::action_log $cmd $arg 0
		return 0
	}
	set arg [::sweeper::expand $ts $arg]
	log "LOG: '$arg'" 0
	return 0
}

proc ::sweeper::action_set {ts cmd arg folder} {
	set val [join [lassign [split $arg =] var] "="]
	set val [::sweeper::expand $ts $val]
	log "Set '$var'='$val'"
	if {![string length $val]} {
		unset -nocomplain $::sweeper::stack($var)
	} else {
		set ::sweeper::stack($var) $val
	}
	return 0
}

proc ::sweeper::action_flag {ts cmd arg folder} {
	log "Flagged [$ts get file] as $arg" 0
	if {!$::sweeper::dryrun} {
		$ts setflag $arg
	} else {
		$ts setflag $arg 1
	}
	return 0
}

proc ::sweeper::action_unflag {ts cmd arg folder} {
	log "Unflagged [$ts get file] as $arg" 0
	if {!$::sweeper::dryrun} {
		$ts unsetflag $arg
	} else {
		$ts unsetflag $arg 1
	}
	return 0
}

eval_plugins sweeper

######################################################################
# Handle action

proc ::sweeper::action {ts cmds folder} {
	lassign $cmds cmd rest
	log "ACTION: $cmd\($rest) \[$folder]" 2
	return [::sweeper::action_$cmd $ts $cmd $rest $folder]
}

######################################################################
# Handle clauses

proc ::sweeper::or {ts clause folder} {
	log " --> OR:" 2
	set ret 0
	while {[llength $clause] > 1} {
		set clause [lassign $clause cmd arg]
		set ret [::sweeper::clause $folder $cmd $arg $ts]
		if {$ret} {
			log " <-- OR true." 2
			break
		}
	}
	if {!$ret} {
		log " <-- OR false." 2
	}
	return $ret
}

proc ::sweeper::and {ts clause folder} {
	log " --> AND:" 2
	set ret 0
	while {[llength $clause] > 1} {
		set clause [lassign $clause cmd arg]
		set ret [::sweeper::clause $folder $cmd $arg $ts]
		if {!$ret} {
			log " <-- AND false." 2
			break
		}
	}
	if {$ret} {
		log " <-- AND true." 2
	}
	return $ret
}

proc ::sweeper::clause {folder cmd arg ts} {
	log "   $cmd\($arg)" 2

	if {[string index $cmd 0] eq "!"} {
		set negate 1
		set cmd [string range $cmd 1 end]
	} else {
		set negate 0
	}
	set ret [::sweeper::$cmd $ts $arg $folder]
	if {$cmd eq "action"} { return $ret }
	if {$negate} { set ret $(!$ret) }
	if {!$ret} {
		log "     Nomatch" 2
	} else {
		log "     MATCH" 2
	}
	return $ret
}

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

proc ::sweeper::runrule {ts rule folder} {
	log "Processing \[$rule]" 2

	if {[string index $rule 0] eq "#" || [llength $rule] < 2} { return 0 }

	while {[llength $rule] > 1} {
		set rule [lassign $rule cmd arg]
		set ret [::sweeper::clause $folder $cmd $arg $ts]
		if {$cmd eq "action"} {
			set ::sweeper::lastruleresult 1
			return $ret
		}
		if {!$ret} break
	}
	set ::sweeper::lastruleresult 0
	return 0
}


proc ::sweeper::apply_folder_rules {dir rules} {
	log "" 2
	log " -- FOLDER RULES --" 2
	log "" 2
	foreach e [readdir -nocomplain $dir] {
		set entry "$dir/$e"
		if {![file isdirectory $entry]} continue
		if {[::sweeper::skipdir $e]} continue

		log "" 2
		log "==== folder $entry ====" 2
		log "" 2

		if {[file exists "$entry/.nosweep"]} {
			log "No-sweep folder." 2
			continue
		}

		set ts 0
		foreach de [lsort -command [lambda {a b} {
		    upvar entry e
		    return $([file mtime "$e/$b"] - [file mtime "$e/$a"])
	            }] [lsearch -glob -all -inline \
		    [readdir -nocomplain $entry] {*.ts}]] {
			set dentry "$entry/$de"

			log " --- Considering $dentry" 2

			if {[catch {set ts [ts fetch $dentry]} msg]} {
				log "Error reading TS file, $msg" 2
				continue
			}

			if {$ts == "0"} {
				log "Invalid TS file." 2
				continue
			}

			if {[$ts inuse]} {
				log "Recording in use." 2
				set ts 0
				continue
			}
			break
		}

		if {$ts == "0"} {
			log "No usable recordings in folder." 2
			continue
		}

		set ::sweeper::stack {}
		foreach rule $rules {
			if {[llength $rule] < 1} continue
			if {[::sweeper::runrule $ts $rule 1]} break
		}
	}
}

proc ::sweeper::apply_rules {dir rules {depth 0} {seen {}}} {

	log "" 2
	log "--- SWEEP($depth) STARTING FOR $dir ---" 2
	log "" 2

	if {$depth > 20} {
		log "ERROR: Maximum recursion depth exceeded." 0
		return
	}

	file stat $dir st
	set key "$st(dev):$st(ino)"
	if {$key in $seen} {
		log "Already seen $dir ($key)" 2
		return
	}
	lappend seen $key

	set dirs {}
	foreach e [readdir -nocomplain $dir] {
		set entry "$dir/$e"
		if {[file isdirectory $entry]} {
			if {![::sweeper::skipdir $e] &&
			    ![file exists "$entry/.nosweep"]} {
				lappend dirs $entry
			}
			continue
		}
		if {![string match {*.ts} $entry]} continue

		log "+ Sweeper processing $entry" 2

		if {[catch {set ts [ts fetch $entry]} msg]} {
			log "Error reading TS file, $msg" 0
			continue
		}

		if {$ts == "0"} {
			log "Invalid TS file." 2
			continue
		}

		if {[$ts inuse]} {
			log "Recording in use." 2
			continue
		}

		set ::sweeper::stack {}
		foreach rule $rules {
			if {[llength $rule] < 3} continue
			set rule [lassign $rule level]
			if {$level < $depth} continue
			if {[::sweeper::runrule $ts $rule 0]} break
		}
	}

	set moredepth 0
	foreach rule $rules {
		set level [lindex $rule 0]
		if {$level > $depth} {
			incr moredepth
			break
		}
	}

	# No rules require greater recursion
	if {!$moredepth} return

	foreach dir $dirs {
		::sweeper::apply_rules $dir $rules $($depth + 1) $seen

		file stat $dir st
		set key "$st(dev):$st(ino)"
		lappend seen $key
	}
}

proc ::sweeper::apply {dir cf} {
	if {[catch {set fp [open $cf r]} msg]} {
		log "Error opening sweeper ruleset ($cf), $msg" 0
		return
	}

	set ::sweeper::recalc {}

        set _rules [split [read $fp] "\n"]
	$fp close

	set rules {}
	set folder_rules {}
	foreach rule $_rules {
		if {[string index $rule 0] eq "#"} continue
		switch -- [lindex $rule 0] {
			folder { lappend folder_rules [lrange $rule 1 end] }
			global { lset rule 0 1; lappend rules $rule }
			recurse { lappend rules [lrange $rule 1 end] }
			default { lappend rules [linsert $rule 0 0] }
		}
	}

	if {[llength $rules]} {
		::sweeper::apply_rules $dir $rules
	}

	if {[llength $folder_rules]} {
		::sweeper::apply_folder_rules $dir $folder_rules
	}

	foreach dir $::sweeper::recalc {
		log "Resetting unwatched recording flag for $dir" 0
		ts resetnew $dir
	}
}

# Callback function which is called from scan_run
proc ::sweeper::sweep {dir} {
	if {$dir eq $::root} return
	::sweeper::apply $dir "$dir/.sweeper"
}

proc ::sweeper::scan {&files} {
	log "::sweeper::scan files  - ($files)" 2
	set ::sweeper::renames {}

	::sweeper::apply $::root $::sweeper::cf
	scan_run $::root sweeper ::sweeper::sweep

	log "::sweeper::scan renames - ($::sweeper::renames)" 2
	if {[llength $::sweeper::renames]} {
		foreach k [array names ::sweeper::renames] {
			set pos [lsearch $files $k]
			log "$k = pos $pos" 2
			if {$pos == -1} continue
			set files [lreplace $files $pos $pos \
			    $::sweeper::renames($k)]
		}
		log "::sweeper::scan files  - ($files)" 2
	}
}

proc ::sweeper::scansingledir {dir} {
	if {$dir eq $::root} {
		::sweeper::apply $::root $::sweeper::cf
	} elseif {[file exists "$dir/.sweeper"]} {
		::sweeper::apply $dir "$dir/.sweeper"
	}
}

if {[file exists $::sweeper::cf]} {
	register postdecryptscan ::sweeper::scan
	register postdecryptsingledir ::sweeper::scansingledir
}