aerc: add build info to version string

Example:

 $ aerc -v
 aerc 0.11.0 +notmuch (go1.18.4 amd64 linux)

Also include that version information in the debug and panic logs.

debug.ReadBuildInfo() is only available in go 1.18+. Add a new variable
set at build time to store $GOFLAGS.

Suggested-by: Tim Culverhouse <tim@timculverhouse.com>
Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Moritz Poldrack <moritz@poldrack.dev>

Makefile

@@ -14,6 +14,7 @@ BUILD_OPTS?=-trimpath
 # ignore environment variable
 GO_LDFLAGS:=
 GO_LDFLAGS+=-X main.Version=$(VERSION)
+GO_LDFLAGS+=-X main.Flags=$(GOFLAGS)
 GO_LDFLAGS+=-X git.sr.ht/~rjarry/aerc/config.shareDir=$(SHAREDIR)
 GO_LDFLAGS+=$(GO_EXTRA_LDFLAGS)
 

aerc.go

@@ -5,7 +5,9 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"runtime"
 	"sort"
+	"strings"
 	"time"
 
 	"git.sr.ht/~sircmpwn/getopt"
@@ -89,6 +91,17 @@ func getCompletions(aerc *widgets.Aerc, cmd string) []string {
 
 // set at build time
 var Version string
+var Flags string
+
+func buildInfo() string {
+	info := Version
+	if strings.Contains(Flags, "notmuch") {
+		info += " +notmuch"
+	}
+	info += fmt.Sprintf(" (%s %s %s)",
+		runtime.Version(), runtime.GOARCH, runtime.GOOS)
+	return info
+}
 
 func usage(msg string) {
 	fmt.Fprintln(os.Stderr, msg)
@@ -124,9 +137,10 @@ func main() {
 		usage("error: " + err.Error())
 		return
 	}
+	logging.BuildInfo = buildInfo()
 	for _, opt := range opts {
 		if opt.Option == 'v' {
-			fmt.Println("aerc " + Version)
+			fmt.Println("aerc " + logging.BuildInfo)
 			return
 		}
 	}
@@ -149,7 +163,7 @@ func main() {
 	if !isatty.IsTerminal(os.Stdout.Fd()) {
 		logging.Init()
 	}
-	logging.Infof("Starting up")
+	logging.Infof("Starting up version %s", logging.BuildInfo)
 
 	conf, err := config.LoadConfigFromFile(nil)
 	if err != nil {

logging/panic-logger.go

@@ -9,7 +9,10 @@ import (
 	"time"
 )
 
-var UICleanup = func() {}
+var (
+	UICleanup = func() {}
+	BuildInfo string
+)
 
 // PanicHandler tries to restore the terminal. A stack trace is written to
 // aerc-crash.log and then passed on if a panic occurs.
@@ -41,6 +44,7 @@ func PanicHandler() {
 	fmt.Fprintln(panicLog, time.Now().Format("2006-01-02T15:04:05.000000-0700"))
 	fmt.Fprintln(panicLog, strings.Repeat("#", 80))
 	fmt.Fprintf(outputs, "%s\n", panicMessage)
+	fmt.Fprintf(outputs, "Version: %s\n", BuildInfo)
 	fmt.Fprintf(panicLog, "Error: %v\n\n", r)
 	panicLog.Write(debug.Stack()) //nolint:errcheck // we are already in a panic, so not much we can do here
 	fmt.Fprintf(os.Stderr, "\nThis error was also written to: %s\n", filename)