improvement: consistent use of delimiter

src/awk/parse.awk

@@ -3,6 +3,8 @@
 ## ```
 ## <start> <end> <fpath> <collection> <status> <summary>
 ## ```.
+## The output is space delimited.
+## Summary may contain spaces, but it's the last in the list.
 ##
 ## @assign collection_labels: See configuration of the current program.
 
@@ -17,7 +19,8 @@
 # @input summary: Content of SUMMARY field of the event
 function print_data(start, dur, end, summary,    cmd, collection, depth, path) {
   summary = getcontent(summary)
-  gsub("\n", " ", summary) # This will be put on a single line
+  gsub("\n", " ",    summary) # This will be put on a single line
+  gsub("\t", "    ", summary) # Generally, we use tab as delimiter.
   depth = split(FILENAME, path, "/")
   fpath = path[depth-1] "/" path[depth]
   collection = depth > 1 ? path[depth-1] : ""