shell: parse every collection filter the same way (#10955)

* worker: move the collection filter parser into weed/util/wildcard

The parser sits beside the volume-list filtering it was written for, in
weed/plugin/worker, which imports weed/shell — so the shell commands that
parse the same filter three other ways can never call it. Move it down to
weed/util/wildcard, next to the comma-separated wildcard helper it already
replaced, leaving the behavior unchanged.

* shell: parse every collection filter the same way

The shell parsed a collection filter three ways: compileCollectionPattern
compiled one regex for ec.encode, ec.decode, volume.balance and the tier
commands; volume.list and volume.deleteEmpty matched a single wildcard; and
volume.tier.move, volume.fix.replication and volume.configure.replication
called filepath.Match on their own. None of them took a list, so
"ec.encode -collection=a,b" selected nothing, the same way the admin UI did.

They all go through the shared matcher now: a comma-separated list of names,
"*" and "?" wildcards, "_default" for the collection with no name, and regex
entries. The one thing that stays per-command is what an empty value means -
every collection for -collectionPattern, the unnamed collection for the ec
and tier -collection flag - so compileCollectionPattern keeps that mapping.

The matchers are compiled once per command instead of once per volume, and a
regex entry now has to match the whole name unless it anchors itself, so
-collection=bucket no longer picks up mybucket2.

* shell: keep dots in collection names, and commas inside a regex

A dot no longer marks an entry as a regex, so a collection named "my.bucket"
matches itself and not "my-bucket" - the difference decides which volumes
volume.deleteEmpty and volume.tier.move touch. A dot still counts when it is
quantified, so "bucket.*" stays a prefix regex.

The comma split also leaves alone the commas inside a character class or a
repetition count, so "bucket[0-9]{1,3}" stays one entry instead of becoming
two broken fragments.

* shell: let a regex entry match its own spelling

A collection named after regex syntax, say "logs(2024)", was unreachable:
the entry compiled to a pattern that matches "logs2024" instead. Match the
entry verbatim as well, so naming a collection always selects it, whatever
characters it holds.

* shell: reject a collection filter that names no collection

A value of "," parsed to no entries and then matched every collection, so a
typo widened ec.encode or volume.deleteEmpty to the whole cluster. Only a
genuinely empty filter means "all collections"; anything else has to name one.

* shell: keep commas inside a regex group out of the entry split

The split already left alone the commas inside a character class or a
repetition count, but not the ones inside a group, so "bucket(foo,bar)"
was cut into two fragments that no longer compile.

* shell: cover escaping a collection name that is not a regex

A name like "logs(2024" does not parse as a regex on its own; escaping it,
"logs\(2024", reaches it. Pin that so the escape hatch does not regress.

* shell: split entries only on commas inside a closed regex construct

An unmatched "{" or "[" made the splitter swallow every comma after it, so
"foo{bar,videos" became one entry that matches neither collection - the
silent no-op this filter work exists to remove. A construct now has to close
before its commas stop separating entries.

* shell: skip character classes while scanning a regex group

A ")" inside a class is a literal, so "(a[)],b)" ended its group early and
split into two fragments that no longer compile.

* shell: cover escaping a comma inside a collection name

A comma separates entries, so a name holding one is reached by escaping it.

* shell: follow the regexp parser when scanning a character class

A "]" leading a class is a member of it, and a POSIX class such as
"[:alpha:]" carries its own "]", so stopping at the first one cut a valid
filter like "(a[]),],b)" into fragments and rejected it.

weed/shell/command_ec_encode.go

@@ -47,10 +47,13 @@ func (c *commandEcEncode) Help() string {
 	If you only have less than 4 volume servers, with erasure coding, at least you can afford to
 	have 4 corrupted shard files.
 
-	The -collection parameter supports regular expressions for pattern matching:
-	  - Use exact match: ec.encode -collection="^mybucket$"
-	  - Match multiple buckets: ec.encode -collection="bucket.*"
-	  - Match all collections: ec.encode -collection=".*"
+	The -collection parameter is a comma-separated list of collection names, with
+	"*" and "?" wildcards, and regex patterns:
+	  - One collection: ec.encode -collection="mybucket"
+	  - Several collections: ec.encode -collection="mybucket,otherbucket"
+	  - Match by prefix: ec.encode -collection="bucket*"
+	  - Match all collections: ec.encode -collection="*"
+	  - The empty-named collection: ec.encode -collection="_default"
 
 	Options:
 	  -verbose: show detailed reasons why volumes are not selected for encoding
@@ -88,7 +91,7 @@ func (c *commandEcEncode) Do(args []string, commandEnv *CommandEnv, writer io.Wr
 	encodeCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
 	volumeId := encodeCommand.Int("volumeId", 0, "the volume id")
 	volumeIdsStr := encodeCommand.String("volumeIds", "", "comma-separated volume ids")
-	collection := encodeCommand.String("collection", "", "collection name or regex pattern")
+	collection := encodeCommand.String("collection", "", "comma-separated collection names, wildcards, or regex patterns; empty matches the collection with no name")
 	fullPercentage := encodeCommand.Float64("fullPercent", 95, "the volume reaches the percentage of max volume size")
 	quietPeriod := encodeCommand.Duration("quietFor", time.Hour, "select volumes without no writes for this period")
 	maxParallelization := encodeCommand.Int("maxParallelization", DefaultMaxParallelization, "run up to X tasks in parallel, whenever possible")
@@ -186,7 +189,7 @@ func (c *commandEcEncode) Do(args []string, commandEnv *CommandEnv, writer io.Wr
 }
 func collectVolumeIdsForEcEncode(commandEnv *CommandEnv, collectionPattern string, sourceDiskType *types.DiskType, fullPercentage float64, quietPeriod time.Duration, verbose bool) (vids []needle.VolumeId, matchedCollections []string, err error) {
 	// compile regex pattern for collection matching
-	collectionRegex, err := compileCollectionPattern(collectionPattern)
+	collectionMatcher, err := compileCollectionPattern(collectionPattern)
 	if err != nil {
 		return nil, nil, fmt.Errorf("invalid collection pattern '%s': %v", collectionPattern, err)
 	}
@@ -202,6 +205,6 @@ func collectVolumeIdsForEcEncode(commandEnv *CommandEnv, collectionPattern strin
 
 	fmt.Printf("collect volumes with collection pattern '%s', quiet for: %d seconds and %.1f%% full\n", collectionPattern, quietSeconds, fullPercentage)
 
-	vids, matchedCollections = ec.SelectVolumeIdsFromTopology(topologyInfo, volumeSizeLimitMb, collectionRegex, sourceDiskType, quietSeconds, nowUnixSeconds, fullPercentage, verbose)
+	vids, matchedCollections = ec.SelectVolumeIdsFromTopology(topologyInfo, volumeSizeLimitMb, collectionMatcher, sourceDiskType, quietSeconds, nowUnixSeconds, fullPercentage, verbose)
 	return
 }