inject file directly

utils/inject-diff.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env nix
+#! nix shell nixpkgs#python3  --command python
+import logging
+
+def inject_diff():
+    source_file = 'post-diff'
+    target_file = 'pr_body.md'
+    placeholder = "nix-diff-placeholder"
+
+    logging.info(f"injecting '{source_file}' into '{target_file}' using '{placeholder}' as a placeholder")
+
+    out = []
+    with open(source_file,'r') as src:
+        src_content = src.read()
+    with open(target_file,'r') as tgt:
+        for line in tgt.readlines():
+            if placeholder in line:
+                out.append(line.replace(placeholder,src_content))
+            else:
+                out.append(line)
+    logging.info(out)
+
+    with open(target_file,'w') as tgt:
+        tgt.writelines(out)
+
+
+
+
+if __name__ == "__main__":
+    logging.basicConfig( level=logging.INFO)
+    inject_diff()