Upgrade scaffolding

jrnl/upgrade.py

@@ -0,0 +1,17 @@
+def upgrade_jrnl_if_necessary(config_path):
+    with open(config_path) as f:
+        config = f.read()
+    if not config.strip().startswith("{"):
+        return
+
+    util.prompt("Welcome to jrnl {}".format(__version__))
+    util.prompt("jrnl will now upgrade your configuration and journal files.")
+    util.prompt("Please note that jrnl 1.x is NOT forward compatible with this version of jrnl.")
+    util.prompt("If you choose to proceed, you will not be able to use your journals with")
+    util.prompt("older versions of jrnl anymore.")
+    cont = util.yesno("Continue upgrading jrnl?", default=False)
+    if not cont:
+        util.prompt("jrnl NOT upgraded, exiting.")
+        sys.exit(1)
+
+    util.prompt("")