ENH: Only add new data to report.

When the last reported values are identical to the current values, do not append the same information (just with a new timestamp) to the report. Instead, just print the last report line.

With this, the report action can be scheduled periodically (e.g. via cron) without artificially inflating the report file.

tests/t9999-testsuite_example.sh

@@ -167,7 +167,7 @@ TODO: Report file updated.
 
 >>> todo.sh report
 2009-02-13T04:40:00 5 2
-TODO: Report file updated.
+TODO: Report file is up-to-date.
 
 >>> todo.sh remdup
 Usage: todo.sh [-fhpantvV] [-d todo_config] action [task_number] [task_description]

todo.sh

@@ -1193,9 +1193,18 @@ note: PRIORITY must be anywhere from A to Z."
 
     TOTAL=$( sed -n '$ =' "$TODO_FILE" )
     TDONE=$( sed -n '$ =' "$DONE_FILE" )
-    echo "$(date +%Y-%m-%dT%T) ${TOTAL:-0} ${TDONE:-0}" >> "$REPORT_FILE"
-    sed -ne '$p' "$REPORT_FILE"
+    NEWDATA="${TOTAL:-0} ${TDONE:-0}"
+    LASTREPORT=$(sed -ne '$p' "$REPORT_FILE")
+    LASTDATA=${LASTREPORT#* }   # Strip timestamp.
+    if [ "$LASTDATA" = "$NEWDATA" ]; then
+        echo "$LASTREPORT"
+        [ $TODOTXT_VERBOSE -gt 0 ] && echo "TODO: Report file is up-to-date."
+    else
+        NEWREPORT="$(date +%Y-%m-%dT%T) ${NEWDATA}"
+        echo "${NEWREPORT}" >> "$REPORT_FILE"
+        echo "${NEWREPORT}"
         [ $TODOTXT_VERBOSE -gt 0 ] && echo "TODO: Report file updated."
+    fi
     ;;
 
 * )