Files and I/O / Reading files / Essential Go
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package main
import (
"bufio"
"fmt"
"log"
"os"
)
// ReadLines reads all lines from a file
func ReadLines(filePath string) ([]string, error) {
file, err := os.OpenFile(filePath, os.O_RDONLY, 0666)
if err != nil {
return nil, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
res := make([]string, 0)
for scanner.Scan() {
line := scanner.Text()
res = append(res, line)
}
if err = scanner.Err(); err != nil {
return nil, err
}
return res, nil
}
func main() {
path := "main.go"
lines, err := ReadLines(path)
if err != nil {
log.Fatalf("ReadLines failed with '%s'\n", err)
}
fmt.Printf("File %s has %d lines\n", path, len(lines))
}
Go
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