/
main.go
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/
main.go
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// Copyright 2016 Yoshi Yamaguchi
//
// Licensed 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 main
import (
"flag"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"regexp"
"github.com/yosssi/gohtml"
)
var (
overwrite = flag.Bool("w", false, "overwrite when -l option is specified")
output = flag.String("o", "", "save file with this name")
)
type InputType int
const (
FILE InputType = iota
URL
)
func main() {
flag.Parse()
typ, err := inputType(flag.Arg(0))
if err != nil {
log.Fatal(err)
}
var data string
switch typ {
case FILE:
data, err = openLocal(flag.Arg(0))
case URL:
data, err = openURL(flag.Arg(0))
}
var file *os.File
if err == nil {
switch {
case *overwrite && typ == FILE:
file, err = os.Create(flag.Arg(0))
case *overwrite && typ == URL:
filename := path.Base(flag.Arg(0))
if filename == "/" || filename == "." {
filename = "result.html"
}
if path.Ext(filename) == "" {
filename += ".html"
}
file, err = os.Create(filename)
case *output != "":
file, err = os.Create(*output)
}
}
if err != nil {
log.Fatal(err)
}
result := gohtml.Format(data)
if file != nil {
file.Write([]byte(result))
} else {
os.Stdout.Write([]byte(result))
}
}
func inputType(input string) (InputType, error) {
matched, err := regexp.MatchString(`https?://*`, input)
if err != nil {
return FILE, err
}
if matched {
return URL, nil
}
return FILE, nil
}
func openLocal(path string) (string, error) {
file, err := os.Open(path)
if err != nil {
return "", err
}
defer file.Close()
data, err := ioutil.ReadAll(file)
if err != nil {
return "", err
}
return string(data), nil
}
func openURL(uri string) (string, error) {
resp, err := http.Get(uri)
if err != nil {
return "", err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(data), nil
}