From 1a81425b053a276f2fdaa27800e3eb32dd1ef1da Mon Sep 17 00:00:00 2001
From: Taras Burko <tburko@users.noreply.github.com>
Date: Thu, 1 Apr 2021 15:57:14 +0100
Subject: [PATCH] Implement version command (#3)

---
 .github/workflows/workflow.yml |  8 +++++---
 Makefile                       |  5 +++--
 cli/main.go                    |  1 +
 cli/version.go                 | 27 +++++++++++++++++++++++++++
 4 files changed, 36 insertions(+), 5 deletions(-)
 create mode 100644 cli/version.go

diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 8380351..0b6a7fe 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -10,6 +10,8 @@ jobs:
 
   build_and_publish:
     runs-on: ubuntu-latest
+    env:
+      version: v0.1.${{ github.run_number }}
     steps:
     - uses: actions/checkout@v2
 
@@ -22,16 +24,16 @@ jobs:
       run: make test
 
     - name: Build Klaabu for Linux
-      run: make GOOS=linux GOARCH=amd64 build
+      run: make GOOS=linux GOARCH=amd64 VERSION=${{ env.version }} build
 
     - name: Build Klaabu for MacOS
-      run: make GOOS=darwin GOARCH=amd64 build
+      run: make GOOS=darwin GOARCH=amd64 VERSION=${{ env.version }} build
 
     - name: Publish the Klaabu binary
       uses: softprops/action-gh-release@v1
       if: github.ref == 'refs/heads/master'
       with:
-        tag_name: v0.1.${{ github.run_number }}
+        tag_name: ${{ env.version }}
         files: |
           ./build/bin/klaabu-linux-amd64
           ./build/bin/klaabu-darwin-amd64
diff --git a/Makefile b/Makefile
index 24505a0..24ca40d 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ NAME := klaabu
 
 BUILD  := ${CURDIR}/build
 BIN    := ${BUILD}/bin
+VERSION := dev
 
 .PHONY: clean tidy compile shasum test run
 .DEFAULT_GOAL := build
@@ -21,10 +22,10 @@ vendor:
 compile:
 ifdef GOOS
 ifdef GOARCH
-	go build -mod=readonly -o ${BIN}/${NAME}-$(GOOS)-$(GOARCH) cli/*.go
+	go build -mod=readonly -ldflags="-X 'main.Version=$${VERSION}'" -o ${BIN}/${NAME}-$(GOOS)-$(GOARCH) cli/*.go
 endif
 else
-	go build -mod=readonly -o ${BIN}/${NAME} cli/*.go
+	go build -mod=readonly -ldflags="-X 'main.Version=$${VERSION}'" -o ${BIN}/${NAME} cli/*.go
 endif
 
 shasum:
diff --git a/cli/main.go b/cli/main.go
index 8ea3f2d..cb17697 100644
--- a/cli/main.go
+++ b/cli/main.go
@@ -13,6 +13,7 @@ var commands = map[string]func(){
 	"init":             initCommand,
 	"space":            spaceCommand,
 	"validate":         validateCommand,
+	"version":          versionCommand,
 }
 
 func helpCommand(c string) {
diff --git a/cli/version.go b/cli/version.go
new file mode 100644
index 0000000..343e44f
--- /dev/null
+++ b/cli/version.go
@@ -0,0 +1,27 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+)
+
+var Version string
+
+func versionCommand() {
+	commandName := "version"
+	flagSet := flag.NewFlagSet(commandName, flag.ExitOnError)
+	flagSet.Parse(os.Args[2:])
+
+	if len(os.Args) != 2 {
+		log.Printf("Usage: klaabu %s\n", flagSet.Name())
+		flagSet.PrintDefaults()
+		os.Exit(1)
+	}
+
+	if Version != "" {
+		log.Println(Version)
+	} else {
+		log.Println("development")
+	}
+}