Merge pull request #35 from hairyhenderson/auto-version

Setting the version at build time from the latest tag

Makefile

@@ -3,6 +3,9 @@ GO := go
 PKG_NAME := gomplate
 PREFIX := .
 
+COMMIT_FLAG := -X `go list ./version`.GitCommit=`git rev-parse --short HEAD 2>/dev/null`
+VERSION_FLAG := -X `go list ./version`.Version=`git describe --abbrev=0 --tags $(git rev-list --tags --max-count=1) 2>/dev/null | sed 's/v\(.*\)/\1/'`
+
 define gocross
 	GOOS=$(1) GOARCH=$(2) \
 		$(GO) build \
@@ -21,7 +24,7 @@ build-x: $(shell find . -type f -name '*.go')
 	$(call gocross,windows,386)
 
 $(PREFIX)/bin/$(PKG_NAME)$(call extension,$(GOOS)): $(shell find . -type f -name '*.go')
-	$(GO) build -o $@
+	$(GO) build -ldflags "$(COMMIT_FLAG) $(VERSION_FLAG)" -o $@
 
 build: $(PREFIX)/bin/$(PKG_NAME)$(call extension,$(GOOS))
 

README.md

@@ -201,11 +201,10 @@ _Note:_ it's important for the `if`/`else`/`end` keywords to appear on the same
 
 Right now the release process is semi-automatic.
 
-1. Update the Version `const` in `main.go`
-2. Create a release tag: `git tag -a v0.0.9 -m "Releasing v0.9.9"`
-3. Build binaries: `make build-x`
-4. _(optional)_ compress the binaries with `upx` (may not work for all architectures)
-5. Create a release in [github](https://github.com/hairyhenderson/gomplate/releases)!
+1. Create a release tag: `git tag -a v0.0.9 -m "Releasing v0.9.9"`
+2. Build binaries: `make build-x`
+3. _(optional)_ compress the binaries with `upx` (may not work for all architectures)
+4. Create a release in [github](https://github.com/hairyhenderson/gomplate/releases)!
 
 ## License
 

main.go

@@ -9,18 +9,16 @@ import (
 	"os"
 
 	"github.com/hairyhenderson/gomplate/aws"
+	"github.com/hairyhenderson/gomplate/version"
 
 	"text/template"
 )
 
-// version
-const Version = "0.2.2"
-
 func init() {
 	ver := flag.Bool("v", false, "Print version and exit")
 	flag.Parse()
 	if *ver {
-		fmt.Println(Version)
+		fmt.Println(version.Version)
 		os.Exit(0)
 	}
 }

version/version.go

@@ -0,0 +1,8 @@
+package version
+
+var (
+	// Version will be overwritten automatically by the build
+	Version = "0.0.0"
+	// GitCommit will be overwritten automatically by the build
+	GitCommit = "HEAD"
+)