add a quick version check until release machinery gets sorted

docs/changelog.txt

@@ -2,6 +2,8 @@ changelog
 
 -- next
 
++ Version string in binary.
+
 ++ Make it easier to upgrade by decoupling data dir from ".".
 
 + Amend changelog for 0.8.0 in include omitted elements:

docs/honk.8

@@ -143,6 +143,10 @@ Restart.
 There's also a
 .Pa blob.db
 file which is important to backup and restore.
+.Pp
+The current version of the honk binary may be printed with the
+.Ic version
+command.
 .Ss SECURITY
 .Nm
 is not currently hardened against SSRF, server side request forgery.

honk.go

@@ -22,11 +22,14 @@ import (
 	"html/template"
 	"log"
 	notrand "math/rand"
+	"os"
 	"strconv"
 	"strings"
 	"time"
 )
 
+var honkVersion = "honk 0.8.0-dev"
+
 func init() {
 	notrand.Seed(time.Now().Unix())
 }
@@ -208,6 +211,9 @@ func main() {
 		initdb()
 	case "upgrade":
 		upgradedb()
+	case "version":
+		fmt.Println(honkVersion)
+		os.Exit(0)
 	}
 	db := opendatabase()
 	dbversion := 0

views/about.html

@@ -2,5 +2,6 @@
 <main>
 <div class="info">
 {{ .AboutMsg }}
+<p style="text-align:right"><small>version: {{ .HonkVersion }}</small>
 </div>
 </main>

web.go

@@ -1800,6 +1800,7 @@ func servehtml(w http.ResponseWriter, r *http.Request) {
 	templinfo := getInfo(r)
 	templinfo["AboutMsg"] = aboutMsg
 	templinfo["LoginMsg"] = loginMsg
+	templinfo["HonkVersion"] = honkVersion
 	if u == nil {
 		w.Header().Set("Cache-Control", "max-age=60")
 	}