/
filetype.go
98 lines (82 loc) · 2.33 KB
/
filetype.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package tools
import (
"flag"
"fmt"
"os"
"github.com/h2non/filetype"
)
func Filetype() error {
flag.Usage = printFiletypeHelp
// Define command line flags
helpFlag := flag.Bool("h", false, "Print help message")
extensionFlag := flag.Bool("e", false, "Show file standard extension")
mimeFlag := flag.Bool("m", false, "Show file mime type")
// Parse command line flags
flag.Parse()
// Print help message if -h flag is provided
if *helpFlag {
flag.Usage()
return nil
}
// Get the file path from the remaining command line arguments
files := flag.Args()
if len(files) != 1 {
flag.Usage()
return nil
}
file := files[0]
fileContent, err := os.ReadFile(file)
if err != nil {
return err
}
kind, err := filetype.Match(fileContent)
if err != nil {
return err
}
var extension string
if kind == filetype.Unknown {
extension = "bin"
} else {
extension = kind.Extension
}
var mime string
if kind == filetype.Unknown {
mime = "applications/octet-stream"
} else {
mime = kind.MIME.Value
}
// if both flags missing or both present, print ext and mime
if (!*extensionFlag && !*mimeFlag) || (*extensionFlag && *mimeFlag) {
fmt.Println(extension, mime)
return nil
}
if *extensionFlag {
fmt.Println(extension)
} else {
fmt.Println(mime)
}
return nil
}
func printFiletypeHelp() {
fmt.Println("Usage: filetype [-h] [-e] [-m] FILE")
fmt.Println("Show extensione and MIME type of a file.")
fmt.Println(" -h shows this help")
fmt.Println(" -e show file standard extension")
fmt.Println(" -m show file mime type")
}