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package main
import (
"flag"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"syscall"
)
func main() {
var sim bool
var glob string
flag.BoolVar(&sim, "sim", false, "simulate")
flag.StringVar(&glob, "glob", "", "glob to use for matching files, must end in *.gif")
flag.Parse()
if !strings.HasSuffix(glob, "*.gif") {
fmt.Fprintln(os.Stderr, "-glob flag required and must end in *.gif")
os.Exit(int(syscall.EINVAL))
}
m, err := filepath.Glob(glob)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to glob %s: %v\n", glob, err)
os.Exit(1)
}
if len(m) == 0 {
fmt.Fprintf(os.Stderr, "no files matched glob %s\n", glob)
os.Exit(1)
}
idx := strings.Index(glob, "*")
for _, match := range m {
num := strings.TrimSuffix(match[idx:], ".gif")
ni, err := strconv.Atoi(num)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to convert number in %s to integer: %v\n", match, err)
os.Exit(1)
}
ni--
newName := fmt.Sprintf("%d.gif", ni)
if sim {
fmt.Printf("would rename %s to %s\n", match, newName)
continue
}
if err := os.Rename(match, newName); err != nil {
fmt.Fprintf(os.Stderr, "failed to rename %s to %s\n", match, newName)
os.Exit(1)
}
}
}
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