feat(version): Adding app version command

Makefile

@@ -1,12 +1,16 @@
+# Define variables
+hash = $(shell git rev-parse --short HEAD)
+DATE = $(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
+
 linux: clean
 	@echo "Building for linux"
-	GOOS=linux GOARCH=amd64 go build -o bin/linux ./cmd/schema
+	GOOS=linux GOARCH=amd64 go build -o bin/linux -ldflags '-X main.Commit=$(hash) -X main.Date=$(DATE)' ./cmd/schema
 windows: clean
 	@echo "Building for windows"
-	GOOS=windows GOARCH=amd64 go build -o bin/windows ./cmd/schema
+	GOOS=windows GOARCH=amd64 go build -o bin/windows -ldflags '-X main.Commit=$(hash) -X main.Date=$(DATE)' ./cmd/schema
 mac: clean
 	@echo "Building for mac"
-	GOOS=darwin GOARCH=amd64 go build -o bin/mac ./cmd/schema
+	GOOS=darwin GOARCH=amd64 go build -o bin/mac -ldflags '-X main.Commit=$(hash) -X main.Date=$(DATE)' ./cmd/schema
 clean:
 	@echo "Cleaning up"
 	# Remove the bin directory

cmd/schema/cmd_version.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"runtime"
+
+	"github.com/google/subcommands"
+)
+
+// Set at linking time
+var (
+	Commit string
+	Date   string
+)
+
+type versionCmd struct{}
+
+func (v versionCmd) Name() string {
+	return "version"
+}
+
+func (v versionCmd) Synopsis() string {
+	return "Print application version information and exit"
+}
+
+func (v versionCmd) Usage() string {
+	return `version:
+  Print application version information and exit.
+`
+}
+
+func (v versionCmd) SetFlags(f *flag.FlagSet) {}
+
+func (v versionCmd) Execute(_ context.Context, _ *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
+	fmt.Printf(
+		"Commit: %s\nRuntime: %s %s/%s\nDate: %s\n",
+		Commit,
+		runtime.Version(),
+		runtime.GOOS,
+		runtime.GOARCH,
+		Date,
+	)
+	return subcommands.ExitSuccess
+}

cmd/schema/main.go

@@ -16,6 +16,7 @@ func main() {
 	subcommands.Register(subcommands.FlagsCommand(), "")
 	subcommands.Register(subcommands.CommandsCommand(), "")
 
+	subcommands.Register(new(versionCmd), "")
 	subcommands.Register(new(generateCmd), "")
 
 	flag.Parse()