字符串运算示例之输出文件名

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    input := bufio.NewScanner(os.Stdin)
    for input.Scan() {
        fmt.Println(basename(input.Text()))
    }
    // NOTE: ignoring potential errors from input.Err()
}

//!+
// basename removes directory components and a .suffix.
// e.g., a => a, a.go => a, a/b/c.go => c, a/b.c.go => b.c
func basename(s string) string {
    // Discard last '/' and everything before.
    for i := len(s) - 1; i >= 0; i-- {
        if s[i] == '/' {
            s = s[i+1:]
            break
        }
    }
    // Preserve everything before last '.'.
    for i := len(s) - 1; i >= 0; i-- {
        if s[i] == '.' {
            s = s[:i]
            break
        }
    }
    return s
}