isogram.go

package main

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

/*
 * example run:
 *
 * go run isogram.go /usr/share/dict/italian |awk -F"'" '{if(length($1) > 9)print length($1), $1}' |sort -gr
 */

func isIsogram(word string) bool {
	myMap := make(map[rune]int, len(word))
	for _, v := range word {
		if _, p := myMap[v]; p {
			myMap[v]++
		} else {
			myMap[v] = 1
		}
	}
	last := myMap[rune(word[0])]
	for _, v := range myMap {
		if v != last {
			return false
		}
		last = v
	}

	return true
}

func main() {
	if len(os.Args) != 2 {
		fmt.Fprintln(os.Stderr, "usage:", os.Args[0], "<file>")
		os.Exit(1)
	}

	file, err := os.Open(os.Args[1])
	if err != nil {
		panic(err)
	}

	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		word := scanner.Text()

		word_ascii := word
		word_ascii = strings.Replace(word_ascii, "à", "a", -1)
		word_ascii = strings.Replace(word_ascii, "è", "e", -1)
		word_ascii = strings.Replace(word_ascii, "è", "e", -1)
		word_ascii = strings.Replace(word_ascii, "ì", "i", -1)
		word_ascii = strings.Replace(word_ascii, "ò", "o", -1)
		word_ascii = strings.Replace(word_ascii, "ù", "u", -1)

		if isIsogram(word_ascii) {
			fmt.Println(word)
		}
	}
}