reorganize: starting with funcs

28-methods/xxx-log-parser-methods/packaged/summarize.go

@@ -0,0 +1,48 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/inancgumus/learngo/x-tba/2-methods/xxx-log-parser-methods/packaged/metrics"
+)
+
+// summarize prints the report and errors if any
+func summarize(rep *metrics.Report, errs ...error) {
+	// TODO: make it strings.Builder
+
+	const format = "%-30s %10s %20s\n"
+	const formatValue = "%-30s %10d %20d\n"
+
+	fmt.Printf(format, "DOMAIN", "VISITS", "TIME SPENT")
+	fmt.Println(strings.Repeat("-", 65))
+
+	next, cur := rep.Iterator()
+	for next() {
+		rec := cur()
+		fmt.Printf(formatValue, rec.Domain, rec.Visits, rec.TimeSpent)
+	}
+
+	fmt.Printf("\n"+formatValue, "TOTAL",
+		rep.Total().Visits, rep.Total().TimeSpent,
+	)
+
+	// only handle the errors once
+	dumpErrs(errs...)
+}
+
+// this variadic func simplifies the multiple error handling
+func dumpErrs(errs ...error) {
+	for _, err := range errs {
+		if err != nil {
+			fmt.Printf("> Err: %s\n", err)
+		}
+	}
+}