Script print histogram first chars in wordlist

first-char-counter.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"
	"sort"
)

func rankByWordCount(wordFrequencies map[string]int) PairList{
	pl := make(PairList, len(wordFrequencies))
	i := 0
	for k, v := range wordFrequencies {
		pl[i] = Pair{k, v}
		i++
	}
	sort.Sort(sort.Reverse(pl))
	return pl
}

type Pair struct {
	Key string
	Value int
}
type PairList []Pair

func (p PairList) Len() int { return len(p) }
func (p PairList) Less(i, j int) bool { return p[i].Value < p[j].Value }
func (p PairList) Swap(i, j int){ p[i], p[j] = p[j], p[i] }

func main() {
	file, err := os.Open("sk.txt")
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()

	countChars := make(map[string]int)
	
	// read file by line
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		countChars[strings.ToLower(string([]rune(scanner.Text())[0]))]++
	}
	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

	// sort by value
	sorted := rankByWordCount(countChars)
	
	// sum all values
	count := 0
	for _, v := range sorted {
		count += v.Value
	}

	// print result
	onePercent := float64(count) * 0.01
	for _, v := range sorted {
		fmt.Printf("%s :\t %.1f%%\n", v.Key, float64(v.Value) / onePercent)
	}
}