refactor: oop log parser

interfaces/log-parser/oop/textreport.go

@@ -0,0 +1,49 @@
+// 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"
+	"os"
+	"text/tabwriter"
+)
+
+// TODO: make this configurable? or exercise?
+const (
+	minWidth = 0
+	tabWidth = 4
+	padding  = 4
+	flags    = 0
+)
+
+type textReport struct{}
+
+func newTextReport() *textReport {
+	return new(textReport)
+}
+
+func (s *textReport) report(results iterator) error {
+	w := tabwriter.NewWriter(os.Stdout, minWidth, tabWidth, padding, ' ', flags)
+
+	write := fmt.Fprintf
+
+	write(w, "DOMAINS\tPAGES\tVISITS\tUNIQUES\n")
+	write(w, "-------\t-----\t------\t-------\n")
+
+	var total result
+	results.each(func(r result) {
+		total = total.add(r)
+
+		write(w, "%s\t%s\t%d\t%d\n", r.domain, r.page, r.visits, r.uniques)
+	})
+
+	write(w, "\t\t\t\n")
+	write(w, "%s\t%s\t%d\t%d\n", "TOTAL", "", total.visits, total.uniques)
+
+	return w.Flush()
+}