102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"bufio"
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"errors"
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"io"
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"os"
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"path/filepath"
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"regexp"
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)
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// SelfPath gets compiled executable file absolute path
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func SelfPath() string {
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path, _ := filepath.Abs(os.Args[0])
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return path
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}
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// SelfDir gets compiled executable file directory
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func SelfDir() string {
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return filepath.Dir(SelfPath())
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}
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// FileExists reports whether the named file or directory exists.
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func FileExists(name string) bool {
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if _, err := os.Stat(name); err != nil {
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if os.IsNotExist(err) {
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return false
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}
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}
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return true
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}
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// SearchFile Search a file in paths.
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// this is often used in search config file in /etc ~/
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func SearchFile(filename string, paths ...string) (fullpath string, err error) {
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for _, path := range paths {
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if fullpath = filepath.Join(path, filename); FileExists(fullpath) {
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return
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}
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}
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err = errors.New(fullpath + " not found in paths")
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return
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}
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// GrepFile like command grep -E
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// for example: GrepFile(`^hello`, "hello.txt")
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// \n is striped while read
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func GrepFile(patten string, filename string) (lines []string, err error) {
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re, err := regexp.Compile(patten)
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if err != nil {
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return
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}
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fd, err := os.Open(filename)
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if err != nil {
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return
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}
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lines = make([]string, 0)
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reader := bufio.NewReader(fd)
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prefix := ""
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var isLongLine bool
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for {
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byteLine, isPrefix, er := reader.ReadLine()
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if er != nil && er != io.EOF {
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return nil, er
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}
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if er == io.EOF {
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break
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}
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line := string(byteLine)
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if isPrefix {
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prefix += line
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continue
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} else {
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isLongLine = true
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}
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line = prefix + line
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if isLongLine {
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prefix = ""
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}
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if re.MatchString(line) {
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lines = append(lines, line)
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}
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}
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return lines, nil
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}
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