Fix direct sphinx build. (#127)

* Fix direct sphinx build.
* Fix source code linker for python sphinx build
---------

Signed-off-by: Nicolae Dicu <[email protected]>

Author: nicu1989

src/extensions/score_plantuml.py

@@ -53,7 +53,7 @@ def get_runfiles_dir() -> Path:
         # But we need to find it first.
         logger.debug("Running outside bazel.")
 
-        git_root = Path(__file__).resolve()
+        git_root = Path.cwd().resolve()
         while not (git_root / ".git").exists():
             git_root = git_root.parent
             if git_root == Path("/"):

src/extensions/score_source_code_linker/generate_source_code_links_json.py

@@ -40,10 +40,15 @@ def find_git_root(start_path: str | Path = "") -> Path | None:
         start_path = __file__
 
     git_root = Path(start_path).resolve()
+    esbonio_search = False
     while not (git_root / ".git").exists():
         git_root = git_root.parent
         if git_root == Path("/"):
-            return None
+            # fallback to cwd when building with python -m sphinx docs _build -T
+            if esbonio_search:
+                return None
+            git_root = Path.cwd().resolve()
+            esbonio_search = True
     return git_root