From 12af5ac96db9fab7d3496a8c096df01039548c36 Mon Sep 17 00:00:00 2001
From: Uri Shaked <uri@urishaked.com>
Date: Fri, 8 Nov 2024 15:55:09 +0200
Subject: [PATCH] fix(sky130_density_fix): don't update project GDS if there
 are no cells to replace

---
 sky130_density_fix/replace_decap.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/sky130_density_fix/replace_decap.py b/sky130_density_fix/replace_decap.py
index 9dfc073b..3f6e67b4 100644
--- a/sky130_density_fix/replace_decap.py
+++ b/sky130_density_fix/replace_decap.py
@@ -80,8 +80,11 @@ def cell_dimensions_equal(cell1, cell2):
         inst.cell = replacement_cell
         replacements += 1
 
-print(f"Replaced {replacements} cells out of {matches} matches.")
-print(f"Writing to {output_gds}...")
+if replacements > 0:
+    print(f"Replaced {replacements} cells out of {matches} matches.")
+    print(f"Writing to {output_gds}...")
+    user_layout.write(output_gds)
+    print("Done.")
+else:
+    print(f"No cells replaced.")
 
-user_layout.write(output_gds)
-print("Done.")