Add version and doc link to help (#15)

* Add version and doc link to help

* adjust action

* remove print from action

* Remove binary

.github/workflows/build.yml

@@ -32,8 +32,13 @@ jobs:
       with:
         go-version: ${{ env.GOLANG_VERSION }}
 
+    - name: Get version
+      id: version
+      uses: home-assistant/actions/helpers/version@master
+
     - name: Build ${{ matrix.variant.name }}
-      run: CGO_ENABLED=0 ${{ matrix.variant.args }} go build -ldflags="-s -w" -o "${{ matrix.variant.name }}"
+      run: |
+        CGO_ENABLED=0 ${{ matrix.variant.args }} go build -ldflags="-s -w -X main.TempioVersion=${{ steps.version.outputs.version }}" -o "${{ matrix.variant.name }}"
 
     - name: Upload release asset
       if: github.event_name == 'release'

main.go

@@ -7,12 +7,23 @@ import (
 	"log"
 )
 
+var TempioVersion string
+
 func main() {
 	var config *map[string]interface{}
 	configFile := flag.String("conf", "", "Config json file, can be omitted if used in a pipe")
 	templateFile := flag.String("template", "", "Template file")
 	outFile := flag.String("out", "", "Output file, if not defined output will be to console")
 
+	flag.Usage = func() {
+		writer := flag.CommandLine.Output()
+
+		fmt.Fprintf(writer, "Version: %s\n", TempioVersion)
+		fmt.Fprintf(writer, "Documentation: https://github.com/home-assistant/tempio\n\n")
+
+		flag.PrintDefaults()
+	}
+
 	// parse command lines
 	flag.Parse()
 	if *templateFile == "" {