build: read the version from git tag

build.sh

@@ -1,19 +1,23 @@
 #!/bin/sh
-targets="linux,amd64"
-
 rm -rf dist/
 
-for i in $targets; do
-    IFS=","
-    set -- $i
+# read the version from the git tag and remove the 'v' prefix
+# if there is not tag, use the short commit hash
+VERSION=$(git describe --tags --abbrev=0 | sed 's/^v//')
+if [ -z "$VERSION" ]; then
+    VERSION=$(git rev-parse --short HEAD)
+fi
+echo "VERSION=${VERSION}"
+
+build() {
     os=$1
     arch=$2
     echo "building $os:$arch"
-    GOOS=$os GOARCH=$arch go build -ldflags "-s -w" -o dist/mouseless .
+    GOOS=$os GOARCH=$arch go build -ldflags "-s -w -X main.version=$VERSION" -o dist/mouseless .
     if [ $? != 0 ]; then
         exit 1
     fi
-    tar -czvf dist/mouseless-${os}-${arch}.tar.gz dist/mouseless
-done
-
+    tar -czvf "dist/mouseless-${os}-${arch}.tar.gz" dist/mouseless
+}
 
+build linux amd64

main.go

@@ -18,13 +18,12 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-const version = "0.2.0-dev"
-
 const (
 	defaultConfigFile = ".config/mouseless/config.yaml"
 )
 
 var (
+	version    string
 	configFile string
 
 	keyboardDevices []*keyboard.Device