good good study, day day up!

vendor/gopl.io/ch3/basename1/main.go

@@ -0,0 +1,44 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 72.
+
+// Basename1 reads file names from stdin and prints the base name of each one.
+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
+}
+
+//!-