From 4ea2ba4c64b71e81e2ff84cf3ead509ac501be97 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ivan=20Miri=C4=87?=
 <1009277+imiric@users.noreply.github.com>
Date: Thu, 11 Apr 2024 13:07:09 +0200
Subject: [PATCH] feat(cli): add version flag

---
 app/app.go     |  2 +-
 app/cli/cli.go | 12 ++++++++----
 app/version.go |  3 ++-
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/app/app.go b/app/app.go
index 8120b2d..99a40de 100644
--- a/app/app.go
+++ b/app/app.go
@@ -54,7 +54,7 @@ func New(dataDir string, opts ...Option) (*App, error) {
 	}
 	app.ctx.UUIDGen = uuidgen
 
-	app.cli, err = cli.New(dataDir)
+	app.cli, err = cli.New(dataDir, app.ctx.Version)
 	if err != nil {
 		return nil, err
 	}
diff --git a/app/cli/cli.go b/app/cli/cli.go
index 10eadc9..b6d30a0 100644
--- a/app/cli/cli.go
+++ b/app/cli/cli.go
@@ -25,15 +25,16 @@ type CLI struct {
 	Invite Invite `kong:"cmd,help='Manage invitations for remote users.'"`
 	Remote Remote `kong:"cmd,help='Manage remote Disco nodes.'"`
 
-	DataDir       string `kong:"default='${dataDir}',help='Directory to store Disco data in.'"`
-	EncryptionKey string `kong:"help='32-byte private key used for encrypting and decrypting the local data store, encoded in base 58. '"`
+	Version       kong.VersionFlag `kong:"help='Output Disco version and exit.'"`
+	DataDir       string           `kong:"default='${dataDir}',help='Directory to store Disco data in.'"`
+	EncryptionKey string           `kong:"help='32-byte private key used for encrypting and decrypting the local data store, encoded in base 58. '"`
 	Log           struct {
 		Level slog.Level `enum:"DEBUG,INFO,WARN,ERROR" default:"INFO" help:"Set the app logging level."`
 	} `embed:"" prefix:"log-"`
 }
 
 // New initializes the command-line interface.
-func New(dataDir string) (*CLI, error) {
+func New(dataDir, version string) (*CLI, error) {
 	c := &CLI{}
 	kparser, err := kong.New(c,
 		kong.Name("disco"),
@@ -44,7 +45,10 @@ func New(dataDir string) (*CLI, error) {
 			Summary:             true,
 			NoExpandSubcommands: true,
 		}),
-		kong.Vars{"dataDir": dataDir},
+		kong.Vars{
+			"dataDir": dataDir,
+			"version": version,
+		},
 	)
 	if err != nil {
 		return nil, err
diff --git a/app/version.go b/app/version.go
index 0b61d8a..4a2f82e 100644
--- a/app/version.go
+++ b/app/version.go
@@ -1,3 +1,4 @@
 package app
 
-const version = "0.0.0"
+// The app version is extracted from Git and set by the Go linker at build time.
+var version string