bee/vendor/github.com/astaxie/beego/utils/file.go

102 lines
2.3 KiB
Go

// Copyright 2014 beego Author. All Rights Reserved.
//
// 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 utils
import (
"bufio"
"errors"
"io"
"os"
"path/filepath"
"regexp"
)
// SelfPath gets compiled executable file absolute path
func SelfPath() string {
path, _ := filepath.Abs(os.Args[0])
return path
}
// SelfDir gets compiled executable file directory
func SelfDir() string {
return filepath.Dir(SelfPath())
}
// FileExists reports whether the named file or directory exists.
func FileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// SearchFile Search a file in paths.
// this is often used in search config file in /etc ~/
func SearchFile(filename string, paths ...string) (fullpath string, err error) {
for _, path := range paths {
if fullpath = filepath.Join(path, filename); FileExists(fullpath) {
return
}
}
err = errors.New(fullpath + " not found in paths")
return
}
// GrepFile like command grep -E
// for example: GrepFile(`^hello`, "hello.txt")
// \n is striped while read
func GrepFile(patten string, filename string) (lines []string, err error) {
re, err := regexp.Compile(patten)
if err != nil {
return
}
fd, err := os.Open(filename)
if err != nil {
return
}
lines = make([]string, 0)
reader := bufio.NewReader(fd)
prefix := ""
isLongLine := false
for {
byteLine, isPrefix, er := reader.ReadLine()
if er != nil && er != io.EOF {
return nil, er
}
if er == io.EOF {
break
}
line := string(byteLine)
if isPrefix {
prefix += line
continue
} else {
isLongLine = true
}
line = prefix + line
if isLongLine {
prefix = ""
}
if re.MatchString(line) {
lines = append(lines, line)
}
}
return lines, nil
}