httpcaddyfile: Treat no matchers as 0-len path matchers (fix #3100)

+ a couple other minor changes from linter

caddyconfig/httpcaddyfile/builtins.go

@@ -37,7 +37,7 @@ func init() {
 	RegisterHandlerDirective("redir", parseRedir)
 	RegisterHandlerDirective("respond", parseRespond)
 	RegisterHandlerDirective("route", parseRoute)
-	RegisterHandlerDirective("handle", parseSegmentAsSubroute)
+	RegisterHandlerDirective("handle", parseHandle)
 	RegisterDirective("handle_errors", parseHandleErrors)
 	RegisterDirective("log", parseLog)
 }

caddyconfig/httpcaddyfile/directives.go

@@ -283,16 +283,15 @@ func sortRoutes(routes []ConfigValue) {
 				return false
 			}
 
-			if len(iRoute.MatcherSetsRaw) == 1 && len(jRoute.MatcherSetsRaw) == 1 {
 			// use already-decoded matcher, or decode if it's the first time seeing it
 			iPM, jPM := decodedMatchers[i], decodedMatchers[j]
-				if iPM == nil {
+			if iPM == nil && len(iRoute.MatcherSetsRaw) == 1 {
 				var pathMatcher caddyhttp.MatchPath
 				_ = json.Unmarshal(iRoute.MatcherSetsRaw[0]["path"], &pathMatcher)
 				decodedMatchers[i] = pathMatcher
 				iPM = pathMatcher
 			}
-				if jPM == nil {
+			if jPM == nil && len(jRoute.MatcherSetsRaw) == 1 {
 				var pathMatcher caddyhttp.MatchPath
 				_ = json.Unmarshal(jRoute.MatcherSetsRaw[0]["path"], &pathMatcher)
 				decodedMatchers[j] = pathMatcher
@@ -300,12 +299,18 @@ func sortRoutes(routes []ConfigValue) {
 			}
 
 			// if there is only one path in the matcher, sort by
-				// longer path (more specific) first
-				if len(iPM) == 1 && len(jPM) == 1 {
+			// longer path (more specific) first; if one of the
+			// routes doesn't have a matcher, then it's treated
+			// like a zero-length path matcher
+			switch {
+			case iPM == nil && jPM != nil:
+				return false
+			case iPM != nil && jPM == nil:
+				return true
+			case iPM != nil && jPM != nil:
 				return len(iPM[0]) > len(jPM[0])
 			}
 		}
-		}
 
 		return dirPositions[iDir] < dirPositions[jDir]
 	})

caddyconfig/httpcaddyfile/httptype.go

@@ -1012,11 +1012,6 @@ func (c counter) nextGroup() string {
 	return name
 }
 
-type matcherSetAndTokens struct {
-	matcherSet caddy.ModuleMap
-	tokens     []caddyfile.Token
-}
-
 type namedCustomLog struct {
 	name string
 	log  *caddy.CustomLog