track cascading errors in Human Readable Log Hints

services/web/public/coffee/ide/human-readable-logs/HumanReadableLogs.coffee

@@ -11,6 +11,8 @@ define [
 		_getRule = (logMessage) ->
 			return rule for rule in ruleset when rule.regexToMatch.test logMessage
 
+		seenErrorTypes = {} # keep track of types of errors seen
+
 		for entry in parsedLogEntries.all
 			ruleDetails = _getRule entry.message
 
@@ -21,8 +23,20 @@ define [
 					entry.ruleId = 'hint_' + ruleDetails.regexToMatch.toString().replace(/\s/g, '_').slice(1, -1)
 				if ruleDetails.newMessage?
 					entry.message = entry.message.replace ruleDetails.regexToMatch, ruleDetails.newMessage
+				# suppress any entries that are known to cascade from previous error types
+				if ruleDetails.cascadesFrom?
+					for type in ruleDetails.cascadesFrom
+						entry.suppressed = true if seenErrorTypes[type]
+				# record the types of errors seen
+				if ruleDetails.types?
+					for type in ruleDetails.types
+						seenErrorTypes[type] = true
 				
 				entry.humanReadableHint = ruleDetails.humanReadableHint if ruleDetails.humanReadableHint?
 				entry.extraInfoURL = ruleDetails.extraInfoURL if ruleDetails.extraInfoURL?
-	
+
+		# filter out the suppressed errors (from the array entries in parsedLogEntries)
+		for key, errors of parsedLogEntries when typeof errors is 'object' and errors.length > 0
+			parsedLogEntries[key] = (err for err in errors when not err.suppressed)
+
 		return parsedLogEntries