cmd/gotp: add subcommand "version"

The "version" command print the module version based on the latest tag,
with additional commit number and hash.

4 files changed, 25 insertions, 4 deletions

diff --git a/.gitignore b/.gitignore
index 3fca313..23f5027 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
 // SPDX-License-Identifier: GPL-3.0-or-later
 README.html
+_bin/
 cover.html
 cover.out
 testdata/add.conf
diff --git a/Makefile b/Makefile
index 4b4f88f..a17d4e4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,20 @@
 ## SPDX-FileCopyrightText: 2021 M. Shulhan <ms@kilabit.info>
 ## SPDX-License-Identifier: GPL-3.0-or-later
-.PHONY: all install
 
-all:
+.PHONY: all test build install
+
+VERSION:=$(shell git describe --tags)
+LDFLAGS:=-ldflags "-s -w -X 'git.sr.ht/~shulhan/gotp.Version=$(VERSION)'"
+
+all: test build
+
+test:
 	CGO_ENABLED=1 go test -race -failfast -coverprofile=cover.out ./...
 	go tool cover -html=cover.out -o cover.out
 
-install:
-	go install ./cmd/gotp
+build:
+	mkdir -p _bin/
+	go build $(LDFLAGS) -o _bin/ ./cmd/...
+
+install: build
+	install -m755 _bin/gotp $(GOBIN)/
diff --git a/cmd/gotp/main.go b/cmd/gotp/main.go
index f031e8b..f159234 100644
--- a/cmd/gotp/main.go
+++ b/cmd/gotp/main.go
@@ -22,6 +22,7 @@ const (
 	cmdList     = `list`
 	cmdRemove   = `remove`
 	cmdRename   = `rename`
+	cmdVersion  = `version`
 )
 
 func main() {
@@ -76,6 +77,11 @@ func main() {
 			log.Printf(`%s %s: missing parameters`, cmdName, cmd)
 			os.Exit(1)
 		}
+
+	case cmdVersion:
+		fmt.Println(`gotp v`, gotp.Version)
+		return
+
 	default:
 		log.Printf(`%s: unknown command %q`, cmdName, cmd)
 		flag.Usage()
diff --git a/gotp.go b/gotp.go
index 3b9625a..4e88a4d 100644
--- a/gotp.go
+++ b/gotp.go
@@ -24,6 +24,10 @@ const (
 	providerNameAegis = `aegis`
 )
 
+var (
+	Version = `0.2.0`
+)
+
 // normalizeLabel convert non alpha number, hyphen, underscore, or period
 // characters into `-`.
 func normalizeLabel(in string) (out string) {