74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"strings"
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"github.com/inancgumus/learngo/28-methods/xxx-log-parser/report"
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)
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// summarize prints the parsing results.
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//
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// it prints the errors and returns if there are any.
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//
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// --json flag encodes to json and prints.
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func summarize(sum *report.Summary, errors ...error) {
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if errs(errors...) {
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return
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}
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if args := os.Args[1:]; len(args) == 1 && args[0] == "--json" {
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encode(sum)
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return
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}
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stdout(sum)
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}
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// encodes the summary to json
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func encode(sum *report.Summary) {
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out, err := json.MarshalIndent(sum, "", "\t")
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if err != nil {
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panic(err)
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}
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os.Stdout.Write(out)
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}
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// prints the summary to standard out
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func stdout(sum *report.Summary) {
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const format = "%-30s %10s %20s\n"
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const formatValue = "%-30s %10d %20d\n"
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fmt.Printf(format, "DOMAIN", "VISITS", "TIME SPENT")
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fmt.Println(strings.Repeat("-", 65))
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next, cur := sum.Iterator()
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for next() {
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rec := cur()
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fmt.Printf(formatValue, rec.Domain, rec.Visits, rec.TimeSpent)
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}
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fmt.Printf("\n"+formatValue, "TOTAL",
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sum.Total().Visits, sum.Total().TimeSpent,
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)
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}
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// this variadic func simplifies the multiple error handling
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func errs(errs ...error) (wasErr bool) {
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for _, err := range errs {
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if err != nil {
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fmt.Printf("> Err: %s\n", err)
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wasErr = true
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}
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}
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return
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}
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