better named scenario error for missing name, improved seq example

engine-cli/src/main/java/io/nosqlbench/engine/cli/NBCLIScenarioParser.java

@@ -49,7 +49,8 @@ public class NBCLIScenarioParser {
         Scenarios scenarios = stmts.getDocScenarios();
         List<String> cmds = scenarios.getNamedScenario(scenarioName);
         if (cmds==null) {
-            throw new BasicError("Unable to find named scenario '" + scenarioName + "' in workload '" + workloadName);
+            throw new BasicError("Unable to find named scenario '" + scenarioName + "' in workload '" + workloadName
+            +", but you can pick from " + String.join(",",scenarios.getScenarioNames()));
         }
 
         // This will hold the command to be prepended to the main arglist

nb/src/main/resources/activities/examples/sequences.yaml

@@ -1,10 +1,14 @@
-# eb run type=stdout yaml=examples/sequences cycles=20 seq=concat
+# eb sequences concat
 # yields ABBCCCDDDDABBCCCDDDD
-# eb run type=stdout yaml=examples/sequences cycles=20 seq=interval
-# yeilds ABCDDCBDCDABCDDCBDCD
-# eb run type=stdout yaml=examples/sequences cycles=20 seq=bucket
-# yeilds ABCDBCDCDDABCDBCDCDD
+# eb run driver=stdout workload=examples/sequences cycles=20 seq=interval
+# yields ABCDDCBDCDABCDDCBDCD
+# eb run driver=stdout workload=examples/sequences cycles=20 seq=bucket
+# yields ABCDBCDCDDABCDBCDCDD
 
+scenarios:
+  concat: driver===stdout seq===concat
+  bucket: driver===stdout seq===bucket
+  interval: driver===stdout seq===interval
 statements:
  - A1: "|"
    ratio: 1
@@ -13,4 +17,4 @@ statements:
  - C3: "="
    ratio: 3
  - D4: ":"
-   ratio: 4
+   ratio: 4