Fix Version variable, add Makefile

.gitignore

@@ -12,6 +12,7 @@
 
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
+build/
 
 wurl
 !wurl/

Makefile

@@ -0,0 +1,63 @@
+# must be valid semver 2.0 version
+ifndef $(VERSION)
+LATEST_TAG=$(shell git describe --tags $(git rev-list --tags --max-count=1))
+VERSION=$(LATEST_TAG:v%=%)
+endif
+EXECUTABLE=wurl
+
+GO?=vgo
+LDFLAGS+=-X main.Version=$(VERSION)
+
+.PHONY: build install uninstall github-release build
+.DEFAULT_GOAL := build
+
+build:
+	@echo "Building for current OS/architecture"
+	$(GO) build -o ./$(EXECUTABLE) -v -ldflags="$(LDFLAGS)"
+
+PREFIX ?= /usr/local
+DESTDIR=
+BIN=$(DESTDIR)$(PREFIX)/bin/
+
+install:
+	install -D ./$(EXECUTABLE) $(BIN)
+
+uninstall:
+	rm $(install_dir)/$(EXECUTABLE)
+
+BUILD_DIR=build
+
+temp_dir_name=$(EXECUTABLE)_$(1)_$(2)_v$(3)
+build_os_arch=GOOS=$(1) GOARCH=$(2) $(GO) build -o $(3) -v -ldflags="$(LDFLAGS)"
+pack_zip=zip -r -j $(1).zip $(1) && rm -rf $(1)
+pack_tgz=tar -C $(1) -cpzf $(1).tar.gz ./ && rm -rf $(1)
+
+define build_github_release
+@echo "Building release package for OS $(1), arch $(2)"
+$(eval temp_build_dir=$(BUILD_DIR)/$(call temp_dir_name,$(1),$(2),$(VERSION)))
+@mkdir -p $(temp_build_dir)
+$(eval ifeq ($(1),windows)
+	temp_executable=$(temp_build_dir)/$(EXECUTABLE).exe
+else
+	temp_executable=$(temp_build_dir)/$(EXECUTABLE)
+endif)
+$(call build_os_arch,$(1),$(2),$(temp_executable))
+$(eval ifeq ($(1),windows)
+	pack_cmd = $(call pack_zip,$(temp_build_dir))
+else
+	pack_cmd = $(call pack_tgz,$(temp_build_dir))
+endif)
+@$(pack_cmd)
+endef
+
+github-release:
+	$(call build_github_release,linux,amd64)
+	$(call build_github_release,linux,386)
+	$(call build_github_release,linux,arm)
+	$(call build_github_release,darwin,amd64)
+	$(call build_github_release,windows,amd64)
+	$(call build_github_release,windows,386)
+
+clean:
+	rm -rf $(BUILD_DIR)
+	$(GO) clean

main.go

@@ -15,13 +15,13 @@ import (
 	"gopkg.in/urfave/cli.v2/altsrc"
 )
 
-var Version = semver.MustParse("0.0.1-alpha")
+var Version = "0.0.1-alpha"
 
 func main() {
 	app := &cli.App{
 		Name:    "wurl",
 		Usage:   "console websocket client",
-		Version: Version.String(),
+		Version: semver.MustParse(Version).String(),
 		Flags: []cli.Flag{
 			flags.InsecureSSLFlag,
 			flags.HeadersFlag,