Add binary renaming for easy downloading

Makefile

@@ -29,6 +29,7 @@ dist: out
 			--image="johnstarich/xgo:1.11-nano" \
 			--targets="${TARGETS}" \
 			${DIST_PACKAGE}
+	go run ./cmd/rename_binaries.go ./out
 
 .PHONY: plugins
 plugins: out

cmd/rename_binaries.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+var (
+	versionRegex = regexp.MustCompile(`\d+(\.\d+)+`)
+	kernelRegex  = regexp.MustCompile(`goenable-([^-]+)`)
+	// make suffixes consistent between download URLs, even if it is technically incorrect for that OS
+	suffixRegex = regexp.MustCompile(`\.dylib`)
+)
+
+func main() {
+	cliName, args := os.Args[0], os.Args[1:]
+	if len(args) != 1 {
+		fmt.Fprintf(os.Stderr, "Usage: %s OUT_DIR\n", filepath.Base(cliName))
+		os.Exit(2)
+	}
+
+	dir := args[0]
+	files, err := ioutil.ReadDir(dir)
+	if err != nil {
+		panic(err)
+	}
+
+	for _, f := range files {
+		fileName := f.Name()
+		newFileName := kernelRegex.ReplaceAllStringFunc(fileName, func(s string) string {
+			s = strings.TrimPrefix(s, "goenable-")
+			s = strings.Title(s)
+			return "goenable-" + s
+		})
+		newFileName = versionRegex.ReplaceAllLiteralString(newFileName, "")
+		newFileName = strings.Replace(newFileName, "--", "-", -1)
+		newFileName = strings.Replace(newFileName, "amd64", "x86_64", 1)
+		newFileName = suffixRegex.ReplaceAllLiteralString(newFileName, ".so")
+
+		if fileName == newFileName {
+			continue
+		}
+		fmt.Printf("Moving %s to %s...\n", fileName, newFileName)
+		err := os.Rename(filepath.Join(dir, fileName), filepath.Join(dir, newFileName))
+		if err != nil {
+			panic(err)
+		}
+	}
+}