use relative paths in build

build.py

@@ -16,8 +16,8 @@ def main():
     parser.add_argument("out", help="output directory", nargs="?", default="./out")
     args = parser.parse_args()
 
-    src = pathlib.Path(args.src).absolute()
-    out = pathlib.Path(args.out).absolute()
+    src = pathlib.Path(args.src)
+    out = pathlib.Path(args.out)
 
     md = markdown.Markdown(extensions=["attr_list", "footnotes", "meta"])
 
@@ -31,10 +31,9 @@ def main():
         (src / ".template.html").read_text(encoding="utf8"),
         features="html.parser")
 
-    # cd to src so os.walk(.) returns paths relative to src
-    os.chdir(src)
     count = 0
-    for dirpath, dirnames, filenames in os.walk("."):
+    for dirpath, _, filenames in os.walk(src):
+        dirpath = pathlib.Path(dirpath).relative_to(src)
         for filename in filenames:
             if filename[0] == ".":
                 continue  # Skip dotfiles