isogramma.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)
        }
    }
}