A utility to test Go's filepath.Match to write .dockerignore

match.go

package main

import (
  "fmt"
  "os"
  "path/filepath"
)

func main() {
  if len(os.Args) < 2 {
    fmt.Fprintf(os.Stderr, "missing operand")
    os.Exit(1)
  }

  pattern := os.Args[1]
  names := os.Args[2:]
  for _, name := range names {
    matched, err := filepath.Match(pattern, name)
    if err != nil { panic(err) }

    if ! matched {
      fmt.Printf("! %s\n", name)
    }
  }
}