From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 1 Dec 2019 15:55:48 +0000 (+0000)
Subject: make-secnet-sites: Provide ArgActionLambda
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=7d24465c2807434cb63a9c54897f5a66dbd55d67;p=secnet.git

make-secnet-sites: Provide ArgActionLambda

optparse has a helpful lambda facility, so you can pass a lambda
directly to add_argument.  But optparse is deprecated so we are using
argparse, in which this facility was unaccountably removed.

Instead you have to subclass argparse.Action.

The resulting ArgActionLambda will still be a bit awkward to use but a
lot better than lifting what ought to be each lambda body into its own
subclass.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/make-secnet-sites b/make-secnet-sites
index 21ff460..6445947 100755
--- a/make-secnet-sites
+++ b/make-secnet-sites
@@ -232,6 +232,13 @@ class Tainted:
 		ok=self._re_ok(Tainted.bad_base91,what,4096)
 		return self._rtn(ok)
 
+class ArgActionLambda(argparse.Action):
+	def __init__(self, fn, **kwargs):
+		self.fn=fn
+		argparse.Action.__init__(self,**kwargs)
+	def __call__(self,ap,ns,values,option_string):
+		self.fn(values,ns,ap,option_string)
+
 def parse_args():
 	global service
 	global inputfile