From 683c3d94b5e491a3107029df854b1624fe500f4e Mon Sep 17 00:00:00 2001
From: Haibao Tang <tanghaibao@gmail.com>
Date: Wed, 24 Jul 2024 19:30:46 +0800
Subject: [PATCH] Fix None path (thanks @jailynai, #693)

---
 jcvi/assembly/hic.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/jcvi/assembly/hic.py b/jcvi/assembly/hic.py
index f4392b88..0547ae15 100644
--- a/jcvi/assembly/hic.py
+++ b/jcvi/assembly/hic.py
@@ -945,7 +945,6 @@ def bam2mat(args):
     )
     p.add_argument(
         "--seqids",
-        default=None,
         help="Use a given seqids file, a single line with seqids joined by comma",
     )
     opts, args = p.parse_args(args)
@@ -959,9 +958,10 @@ def bam2mat(args):
     pf += f".resolution_{N}"
     bins = 1500  # Distance distribution bins
     minsize = 100  # Record distance if it is at least minsize
+    seqids = opts.seqids
     seqids = (
-        open(opts.seqids).readline().strip().split(",")
-        if op.exists(opts.seqids)
+        open(seqids).readline().strip().split(",")
+        if seqids and op.exists(seqids)
         else None
     )