Added version information to built binary, updated Makefile

Author: Baldomo

.editorconfig

@@ -8,7 +8,7 @@ charset = utf-8
 trim_trailing_whitespace = false
 insert_final_newline = false
 
-[{Makefile}]
+[Makefile]
 indent_style = tab
 
 [*.{html,js,json,css,yml}]

Makefile

@@ -1,46 +1,65 @@
-SRC:=config.go ipc.go options.go $(wildcard cmd/open-in-mpv/*)
-EXT_SRC:=$(wildcard extension/Chrome/*) extension/Firefox/manifest.json
-SCRIPTS_DIR:=scripts
-BUILD_DIR:=build
-
-all: $(BUILD_DIR)/open-in-mpv.tar.gz $(BUILD_DIR)/linux.tar $(BUILD_DIR)/mac.tar $(BUILD_DIR)/windows.tar $(BUILD_DIR)/firefox.zip
-
-builddir:
+SRC := config.go ipc.go options.go $(wildcard cmd/open-in-mpv/*)
+EXT_SRC := $(wildcard extension/Chrome/*) extension/Firefox/manifest.json
+SCRIPTS_DIR := scripts
+
+TAG_COMMIT := $(shell git rev-list --abbrev-commit --tags --max-count=1)
+TAG := $(shell git describe --abbrev=0 --tags ${TAG_COMMIT} 2>/dev/null || true)
+COMMIT := $(shell git rev-parse --short HEAD)
+DATE_PRETTY := $(shell env TZ=UTC0 git log -1 --format=%cd --date=format:"%Y-%m-%d")
+DATE := $(shell env TZ=UTC0 git log -1 --format=%cd --date=format:"%Y%m%d")
+VERSION := $(TAG:v%=%)
+ifneq ($(COMMIT), $(TAG_COMMIT))
+    VERSION := $(VERSION)-next-$(COMMIT)-$(DATE)
+endif
+ifeq ($(VERSION),)
+    VERSION := $(COMMIT)-$(DATA)
+endif
+ifneq ($(shell git status --porcelain),)
+    VERSION := $(VERSION)-dirty
+endif
+BUILD_DIR := build/$(VERSION)
+
+LDFLAGS := -s -w -X main.Version=$(TAG) -X main.BuildDate=$(DATE_PRETTY) -X main.Commit=$(COMMIT)
+
+
+all: $(BUILD_DIR)/open-in-mpv_$(VERSION).tar.gz $(BUILD_DIR)/linux.tar $(BUILD_DIR)/mac.tar $(BUILD_DIR)/windows.tar $(BUILD_DIR)/firefox.zip
+
+$(BUILD_DIR):
 	@mkdir -p $(BUILD_DIR)/linux $(BUILD_DIR)/windows $(BUILD_DIR)/mac
 
-$(BUILD_DIR)/open-in-mpv.tar.gz: $(SRC)
+$(BUILD_DIR)/open-in-mpv_$(VERSION).tar.gz: $(SRC)
 	@echo -e "\n# Creating tarball"
 	go mod vendor
-	tar czf $(BUILD_DIR)/open-in-mpv.tar.gz --transform "s,^,open-in-mpv/," --exclude $(BUILD_DIR) *
+	tar czf $(BUILD_DIR)/open-in-mpv_$(VERSION).tar.gz --transform "s,^,open-in-mpv_$(VERSION)/," --exclude $(BUILD_DIR) *
 	rm -rf vendor
 
-$(BUILD_DIR)/linux/open-in-mpv: $(SRC) builddir
+$(BUILD_DIR)/linux/open-in-mpv: $(SRC) $(BUILD_DIR)
 	@echo -e "\n# Building for Linux"
-	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o $@ ./cmd/open-in-mpv
+	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="$(LDFLAGS)" -o $@ ./cmd/open-in-mpv
 	cp $(SCRIPTS_DIR)/install-protocol.sh $(dir $@)
 	cp $(SCRIPTS_DIR)/open-in-mpv.desktop $(dir $@)
 
 $(BUILD_DIR)/linux.tar: $(BUILD_DIR)/linux/open-in-mpv
 	tar cf $@ -C $(dir $@)linux $(notdir $(wildcard $(BUILD_DIR)/linux/*))
 
-$(BUILD_DIR)/mac/open-in-mpv.app: $(SRC) scripts/Info.plist builddir
+$(BUILD_DIR)/mac/open-in-mpv.app: $(SRC) scripts/Info.plist $(BUILD_DIR)
 	@# See https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html
 	@# and https://apple.stackexchange.com/questions/253184/associating-protocol-handler-in-mac-os-x
 	@echo -e "\n# Building MacOS app bundle"
 	@mkdir -p $@/Contents/MacOS
 	go install github.com/randall77/makefat@latest
-	env CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w" -o $(dir $@)open-in-mpv.amd64 ./cmd/open-in-mpv
-	env CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -ldflags="-s -w" -o $(dir $@)open-in-mpv.arm64 ./cmd/open-in-mpv
+	env CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags="$(LDFLAGS)" -o $(dir $@)open-in-mpv.amd64 ./cmd/open-in-mpv
+	env CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -ldflags="$(LDFLAGS)" -o $(dir $@)open-in-mpv.arm64 ./cmd/open-in-mpv
 	$(GOBIN)/makefat $@/Contents/MacOS/open-in-mpv $(dir $@)open-in-mpv.amd64 $(dir $@)open-in-mpv.arm64
 	cp config.yml $@/Contents/MacOS/
 	cp $(SCRIPTS_DIR)/Info.plist $@/Contents
 
 $(BUILD_DIR)/mac.tar: $(BUILD_DIR)/mac/open-in-mpv.app
 	tar cf $@ -C $(dir $@)/mac open-in-mpv.app
 
-$(BUILD_DIR)/windows/open-in-mpv.exe: $(SRC) builddir
+$(BUILD_DIR)/windows/open-in-mpv.exe: $(SRC) $(BUILD_DIR)
 	@echo -e "\n# Building for Windows"
-	env CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="-s -w -H windowsgui" -o $@ ./cmd/open-in-mpv
+	env CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="$(LDFLAGS) -H windowsgui" -o $@ ./cmd/open-in-mpv
 	cp $(SCRIPTS_DIR)/install-protocol.reg $(dir $@)
 
 $(BUILD_DIR)/windows.tar: $(BUILD_DIR)/windows/open-in-mpv.exe
@@ -62,9 +81,9 @@ uninstall:
 	rm /usr/bin/open-in-mpv
 
 clean:
-	rm -rf $(BUILD_DIR)/*
+	rm -rf $(dir $(BUILD_DIR))*
 
 test:
 	go test ./...
 
-.PHONY: all builddir install install-protocol uninstall clean test
+.PHONY: all install install-protocol uninstall clean test

cmd/open-in-mpv/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"log"
 	"os"
@@ -9,6 +10,12 @@ import (
 	oim "github.com/Baldomo/open-in-mpv"
 )
 
+var (
+	Version   = "dev"
+	Commit    string
+	BuildDate string
+)
+
 func must(err error) {
 	if err == nil {
 		return
@@ -18,8 +25,25 @@ func must(err error) {
 }
 
 func main() {
-	if len(os.Args) < 2 {
-		fmt.Println("This program is not supposed to be called from the command line!")
+	flag.Usage = func() {
+		fmt.Printf("Usage: open-in-mpv [OPTIONS] <URL>\n")
+		fmt.Printf("Flags:\n")
+		flag.PrintDefaults()
+	}
+
+	showVersion := flag.Bool("v", false, "show version information")
+	flag.Parse()
+
+	if *showVersion {
+		fmt.Printf("open-in-mpv %s\n", Version)
+		fmt.Printf("  Commit: %s\n", Commit)
+		fmt.Printf("  Built on: %s\n", BuildDate)
+		os.Exit(0)
+	}
+
+	if flag.NArg() == 0 {
+		fmt.Println("No arguments supplied!")
+		flag.Usage()
 		os.Exit(1)
 	}