Created
January 28, 2017 06:53
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package main | |
import ( | |
"os" | |
"bufio" | |
"log" | |
"strconv" | |
"path/filepath" | |
) | |
const ( | |
NULL rune = 0 | |
) | |
func main() { | |
// read file | |
rfp, err := os.Open(os.Args[1]) | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer rfp.Close() | |
reader := bufio.NewReaderSize(rfp, 4096) | |
// 抜き出したい列 | |
col, err := strconv.Atoi(os.Args[2]) | |
if err != nil { | |
log.Fatal(err) | |
} | |
// write file | |
dir, _ := filepath.Split(os.Args[1]) | |
filename := dir + "col" + strconv.Itoa(col) + ".txt" | |
wfp, err := os.Create(filename) | |
if err != nil { | |
log.Fatal(err) | |
} | |
defer wfp.Close() | |
var count int = 1 | |
var word []rune | |
for { | |
p, _, _ := reader.ReadRune() | |
// ファイル終端ならループを抜ける | |
if p == NULL { | |
break | |
} | |
if p == rune('\t') { | |
count++ | |
} else if count == col { | |
word = append(word, p) | |
} | |
if p == rune('\n') { | |
wfp.Write([]byte(string(word))) | |
wfp.Write([]byte(string('\n'))) | |
count = 1 | |
word = nil | |
} | |
} | |
} |
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