M docs/honk.8 → docs/honk.8

@@ -62,11 +62,15 @@ The root data directory, where the database and other user data are stored.
 This directory contains all user data that persists across upgrades.
 Requires write access.
 Defaults to ".".
+Also set by
+.Ev HONK_DATADIR .
 .It Fl viewdir Ar dir
 The root view directory, where html and other templates are stored.
 The contents of this directory are generally replaced with each release.
 Read only.
 Defaults to ".".
+Also set by
+.Ev HONK_VIEWDIR .
 .El
 .Pp
 The following options control log output.

M main.go → main.go

@@ -103,8 +103,8 @@ callback: func(args []string) {
 			usage()
 		},
 	}
-	flag.StringVar(&dataDir, "datadir", dataDir, "data directory")
-	flag.StringVar(&viewDir, "viewdir", viewDir, "view directory")
+	flag.StringVar(&dataDir, "datadir", getenv("HONK_DATADIR", dataDir), "data directory")
+	flag.StringVar(&viewDir, "viewdir", getenv("HONK_VIEWDIR", viewDir), "view directory")
 	flag.Usage = usage
 
 	flag.Parse()

M util.go → util.go

@@ -461,3 +461,10 @@ }
 	listenSocket = listener
 	return listener, nil
 }
+
+func getenv(key, def string) string {
+	if val, ok := os.LookupEnv(key); ok {
+		return val
+	}
+	return def
+}