From 219429ddb3f3355509c0ee3d782d5e6386a38c2b Mon Sep 17 00:00:00 2001
From: Luiz Irber <luiz.irber@gmail.com>
Date: Wed, 8 Jan 2020 04:50:35 +0000
Subject: [PATCH] print citation only once

---
 sourmash/cli/__init__.py | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/sourmash/cli/__init__.py b/sourmash/cli/__init__.py
index 7080c00549..d7cfe04d14 100644
--- a/sourmash/cli/__init__.py
+++ b/sourmash/cli/__init__.py
@@ -38,18 +38,20 @@
 
 
 class SourmashParser(ArgumentParser):
+    _citation_printed = False
+
     def __init__(self, citation=True, **kwargs):
         super(SourmashParser, self).__init__(**kwargs)
         self.citation = citation
-        self._citation_printed = False
 
-    def print_citation(self):
-        if self._citation_printed:
+    @classmethod
+    def print_citation(cls):
+        if cls._citation_printed:
             return
         from sourmash.logging import notify
         notify("\n== This is sourmash version {version}. ==", version=sourmash.VERSION)
         notify("== Please cite Brown and Irber (2016), doi:10.21105/joss.00027. ==\n")
-        self._citation_printed = True
+        cls._citation_printed = True
 
     def _subparser_from_name(self, name):
         """Given a name, get the subparser instance registered with this parser."""
@@ -63,8 +65,8 @@ def _subparser_from_name(self, name):
                 return action.choices[name]
 
     def print_help(self):
-        super(SourmashParser, self).print_help()
         self.print_citation()
+        super(SourmashParser, self).print_help()
 
 
     def parse_args(self, args=None, namespace=None):