good good study, day day up!

vendor/gopl.io/ch8/thumbnail/main.go

@@ -0,0 +1,42 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// +build ignore
+
+// The thumbnail command produces thumbnails of JPEG files
+// whose names are provided on each line of the standard input.
+//
+// The "+build ignore" tag (see p.295) excludes this file from the
+// thumbnail package, but it can be compiled as a command and run like
+// this:
+//
+// Run with:
+//   $ go run $GOPATH/src/gopl.io/ch8/thumbnail/main.go
+//   foo.jpeg
+//   ^D
+//
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+
+	"gopl.io/ch8/thumbnail"
+)
+
+func main() {
+	input := bufio.NewScanner(os.Stdin)
+	for input.Scan() {
+		thumb, err := thumbnail.ImageFile(input.Text())
+		if err != nil {
+			log.Print(err)
+			continue
+		}
+		fmt.Println(thumb)
+	}
+	if err := input.Err(); err != nil {
+		log.Fatal(err)
+	}
+}