Expanding Tilde to Home Directory in Go

In Go, expanding the tilde (~) character to the user's home directory is crucial for handling relative paths in programs. However, the built-in path package doesn't natively support this feature.

To address this challenge, we can leverage the os/user package, which provides a cross-platform way to retrieve various user information. The Current() function allows us to obtain the current user's details, including their home directory.

import (
    "os/user"
    "path/filepath"
)

// Utility function to expand the tilde character to the user's home directory
func expandTilde(path string) string {
    currentUser, _ := user.Current()
    homeDir := currentUser.HomeDir

    if path == "~" {
        return homeDir
    } else if strings.HasPrefix(path, "~/") {
        return filepath.Join(homeDir, path[2:])
    }
    return path
}

This function checks if the path string starts with "~/" to determine if it needs expansion, and then uses filepath.Join to concatenate the home directory with the relative path.

Incorporating this functionality into your existing code, you can now expand the tilde character in your destination path:

import "path"

// var destination *String is the user input

func expandPath() {
        if path.IsAbs(*destination) {
                return
        }
        cwd, err := os.Getwd()
        checkError(err)
        *destination = path.Join(cwd, *destination)
}

By expanding the tilde character in addition to joining relative paths, your program can now handle destination paths that include both absolute and relative directory structures.