NEW: add a example that packs files into the go binary

Signed-off-by: Jeff Carr <jcarr@wit.com>

Makefile

@@ -33,6 +33,7 @@ build:
 	cd example-lookupAAAA;		go install	# nslookup
 	cd example-json-decode;		go install	# raw golang byte handling
 	cd example-ssh;			go install	# scp example
+	cd example-packr;		go install	# pack a directory into a go binary
 
 	# golang things
 	cd example-flag;		go install	# process argv
@@ -44,12 +45,22 @@ build:
 # witgoget='-v -t' make prep
 # witgoget='-v -t -u' make prep		# to update
 prep:
+	witgoget='-v -t' make base
+
+update:
+	witgoget='-v -t -u' make base
+
+base:
 	make -C example-nohup prep
 	make -C example-expect prep
 	make -C example-shell prep
 	make -C example-gocui-mouse prep
 	make -C example-systray prep
 	make -C example-lookupAAAA prep
+	make -C example-gui prep
+
+init:
+	sudo make -C example-systray init
 
 sub-make:
 	# shell things

example-packr/Makefile

@@ -0,0 +1,2 @@
+build:
+	go build

example-packr/main.go

@@ -0,0 +1,19 @@
+package main
+
+import "log"
+import "github.com/gobuffalo/packr"
+
+var packrBox packr.Box
+
+func main() {
+
+	log.Println("packr ./resources box")
+
+	// This puts all the files in that directory in the binary
+	// This directory includes the default config file if there is not already one
+	packrBox = packr.NewBox("./resources")
+
+	filename := "root-anchors.xml"
+	b, _ := packrBox.FindString(filename)
+	log.Println(filename, "=\n\n", b)
+}

example-packr/resources/root-anchors.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<TrustAnchor id="380DC50D-484E-40D0-A3AE-68F2B18F61C7" source="http://data.iana.org/root-anchors/root-anchors.xml">
+<Zone>.</Zone>
+<KeyDigest id="Kjqmt7v" validFrom="2010-07-15T00:00:00+00:00" validUntil="2019-01-11T00:00:00+00:00">
+<KeyTag>19036</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5</Digest>
+</KeyDigest>
+<KeyDigest id="Klajeyz" validFrom="2017-02-02T00:00:00+00:00">
+<KeyTag>20326</KeyTag>
+<Algorithm>8</Algorithm>
+<DigestType>2</DigestType>
+<Digest>E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D</Digest>
+</KeyDigest>
+</TrustAnchor>