Go语言路径处理：智能合并绝对路径与相对路径

package main

import (
    "fmt"
    "path"
)

// joinPaths 合并源绝对路径和目标相对路径，生成新的绝对路径。
// 如果目标路径本身就是绝对路径，则直接返回目标路径。
func joinPaths(source, target string) string {
    // 如果目标路径已经是绝对路径，则直接返回它
    if path.IsAbs(target) {
        return target
    }
    // 否则，获取源路径的目录部分，然后与目标相对路径合并
    // path.Dir("/help/index.html") 返回 "/help"
    // path.Join("/help", "../otherpage/index.html") 返回 "/otherpage/index.html"
    return path.Join(path.Dir(source), target)
}

func main() {
    // 示例1: 从根目录的index.html链接到help/help1.html
    source1 := "/index.html"
    target1 := "help/help1.html"
    result1 := joinPaths(source1, target1)
    fmt.Printf("源路径: %s, 目标路径: %s -> 结果: %s\n", source1, target1, result1) // 预期: /help/help1.html

    // 示例2: 从/help/help1.html链接到上级目录的content.txt
    source2 := "/help/help1.html"
    target2 := "../content.txt"
    result2 := joinPaths(source2, target2)
    fmt.Printf("源路径: %s, 目标路径: %s -> 结果: %s\n", source2, target2, result2) // 预期: /content.txt

    // 示例3: 从根目录链接到help/help1.html (源路径是目录)
    source3 := "/"
    target3 := "help/help1.html"
    result3 := joinPaths(source3, target3)
    fmt.Printf("源路径: %s, 目标路径: %s -> 结果: %s\n", source3, target3, result3) // 预期: /help/help1.html

    // 示例4: 目标路径本身就是绝对路径
    source4 := "/some/dir/file.txt"
    target4 := "/another/absolute/path.txt"
    result4 := joinPaths(source4, target4)
    fmt.Printf("源路径: %s, 目标路径: %s -> 结果: %s\n", source4, target4, result4) // 预期: /another/absolute/path.txt

    // 示例5: 相对路径包含子目录
    source5 := "/help/"
    target5 := "sub/dir/of/help/page.html"
    result5 := joinPaths(source5, target5)
    fmt.Printf("源路径: %s, 目标路径: %s -> 结果: %s\n", source5, target5, result5) // 预期: /help/sub/dir/of/help/page.html

    // 示例6: 相对路径只是一个文件名
    source6 := "/articles/2023/index.html"
    target6 := "image.png"
    result6 := joinPaths(source6, target6)
    fmt.Printf("源路径: %s, 目标路径: %s -> 结果: %s\n", source6, target6, result6) // 预期: /articles/2023/image.png
}

源路径: /index.html, 目标路径: help/help1.html -> 结果: /help/help1.html
源路径: /help/help1.html, 目标路径: ../content.txt -> 结果: /content.txt
源路径: /, 目标路径: help/help1.html -> 结果: /help/help1.html
源路径: /some/dir/file.txt, 目标路径: /another/absolute/path.txt -> 结果: /another/absolute/path.txt
源路径: /help/, 目标路径: sub/dir/of/help/page.html -> 结果: /help/sub/dir/of/help/page.html
源路径: /articles/2023/index.html, 目标路径: image.png -> 结果: /articles/2023/image.png