Text editor developed in Go language

File editor implemented in Golang

Overview:
In daily programming work, it is often necessary to edit, search, replace and other operations on file content. In order to improve efficiency, you can use Golang language to implement a simple file editor that can implement common file operation functions. This article will introduce how to use Golang to write a command line-based file editor and provide specific code examples.

Function:

1. Open file: The user can enter the file path, and the editor will open the file and display the file content.
2. Search: The user enters a search keyword, and the editor will find the line containing the keyword in the file and display it.
3. Replacement: The user can enter the keyword to be replaced and the replaced content, and the editor will replace all content containing the keyword in the file.
4. Save: Users can save changes to the file.
5. Exit: The user can exit the editor.

Specific implementation:
The following is a Golang code example of a simple file editor:

package main

import (
    "bufio"
    "fmt"
    "io/ioutil"
    "os"
    "strings"
)

func openFile(filePath string) string {
    file, err := ioutil.ReadFile(filePath)
    if err != nil {
        return ""
    }
    return string(file)
}

func searchFile(content string, keyword string) {
    scanner := bufio.NewScanner(strings.NewReader(content))
    for scanner.Scan() {
        line := scanner.Text()
        if strings.Contains(line, keyword) {
            fmt.Println(line)
        }
    }
}

func replaceFile(filePath string, old string, new string) {
    file, err := ioutil.ReadFile(filePath)
    if err != nil {
        return
    }
    content := string(file)
    newContent := strings.ReplaceAll(content, old, new)
    err = ioutil.WriteFile(filePath, []byte(newContent), 0644)
    if err != nil {
        return
    }
}

func main() {
    var filePath, keyword, old, new string
    fmt.Println("请输入文件路径：")
    fmt.Scanln(&filePath)
    content := openFile(filePath)
    if content == "" {
        fmt.Println("文件打开失败")
        return
    }

    fmt.Println("请输入要查找的关键字：")
    fmt.Scanln(&keyword)
    searchFile(content, keyword)

    fmt.Println("请输入要替换的关键字：")
    fmt.Scanln(&old)
    fmt.Println("请输入替换后的内容：")
    fmt.Scanln(&new)
    replaceFile(filePath, old, new)

    fmt.Println("文件编辑完成，是否保存？(Y/N)")
    var choice string
    fmt.Scanln(&choice)
    if strings.ToUpper(choice) == "Y" {
        fmt.Println("文件保存成功")
    } else {
        fmt.Println("文件未保存")
    }
}

The above code implements a simple file editor, including opening files, Find content, replace content, save files and more. Users can expand more functions as needed, such as undoing operations, editing multiple files, etc. Through this example, I hope readers can master the basic ideas and skills of how to use Golang language to write a file editor.

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