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grep.go
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grep.go
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package main
import (
"errors"
"fmt"
"os"
"strings"
)
func grep(s string) (string, error) {
c := strings.Split(s, " ")
if len(c) < 3 {
return "", errors.New("grep error")
}
if strings.Contains(s, "\n") {
var b strings.Builder
for _, ss := range strings.Split(s[len(c[0])+len(c[1])+2:], "\n") {
if strings.Contains(ss, c[1]) {
_, err := fmt.Fprintf(&b, "%s\n", ss)
if err != nil {
return "", err
}
}
}
return strings.TrimRight(b.String(), "\n"), nil
} else {
if _, err := os.Stat(c[2]); err == nil {
b, err := os.ReadFile(c[2])
if err != nil {
return "", err
}
bs := strings.Split(string(b), "\n")
var sb strings.Builder
for _, bss := range bs {
if strings.Contains(bss, c[1]) {
_, err = fmt.Fprintf(&sb, "%s\n", bss)
if err != nil {
return "", err
}
}
}
return strings.TrimRight(sb.String(), "\n"), nil
} else if errors.Is(err, os.ErrNotExist) {
if strings.Contains(c[2], c[1]) {
return c[2], nil
} else {
return "", nil
}
} else {
return "", err
}
}
}