mu-cfind: re-enable --after option

It was still there, but disabled.

Fixes #2470.

man/mu-cfind.1.org

@@ -70,15 +70,15 @@ should only apply to name fields.
 addresses was seen in one of the address fields; this is to exclude addresses
 only seen in mailing-list messages. See the ~--my-address~ parameter to *mu init*.
 
-# ** --after=<timestamp> only show addresses last seen after
-# =<timestamp>=. =<timestamp>= is a UNIX *time_t* value, the number of
-# seconds since 1970-01-01 (in UTC).
+** --after=<timestamp> only show addresses last seen after
+=<timestamp>=. =<timestamp>= is a UNIX *time_t* value, the number of
+seconds since 1970-01-01 (in UTC).
 
-# From the command line, you can use the *date* command to get this value. For
-# example, only consider addresses last seen after 2009-06-01, you could specify
-# #+begin_example
-#   --after=`date +%s --date='2009-06-01'`
-# #+end_example
+From the command line, you can use the *date* command to get this value. For
+example, only consider addresses last seen after 2020-06-01, you could specify
+#+begin_example
+  --after=`date +%s --date='2020-06-01'`
+#+end_example
 
 #+include: "muhome.inc" :minlevel 2
 

mu/mu-options.cc

@@ -191,6 +191,10 @@ sub_cfind(CLI::App& sub, Options& opts)
 		       "Regular expression pattern to match");
 	sub.add_flag("--personal,-p", opts.cfind.personal,
 		       "Only show 'personal' contacts");
+	sub.add_option("--after", opts.cfind.after,
+		       "Only show results after some timestamps")
+		->type_name("<time_t>")
+		->check(CLI::PositiveNumber);
 	sub.add_option("--maxnum,-n", opts.cfind.maxnum,
 		       "Maximum number of results")
 		->type_name("<number>")