Revert "run_before_script: Use chunk-based output"

This reverts commit 15e933f.

Author: tony

src/tmuxp/util.py

@@ -24,7 +24,7 @@
 PY2 = sys.version_info[0] == 2
 
 
-def run_before_script2(
+def run_before_script(
     script_file: str | pathlib.Path,
     cwd: pathlib.Path | None = None,
 ) -> int:
@@ -96,73 +96,6 @@ def run_before_script2(
     return return_code
 
 
-def run_before_script(
-    script_file: str | pathlib.Path,
-    cwd: pathlib.Path | None = None,
-) -> int:
-    script_cmd = shlex.split(str(script_file))
-
-    try:
-        proc = subprocess.Popen(
-            script_cmd,
-            cwd=cwd,
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-            text=True,  # still decode to str
-            errors="backslashreplace",
-            bufsize=0,  # unbuffered in Python, best effort
-        )
-    except FileNotFoundError as e:
-        raise exc.BeforeLoadScriptNotExists(
-            e,
-            os.path.abspath(script_file),  # NOQA: PTH100
-        ) from e
-
-    out_buffer = []
-    err_buffer = []
-    is_out_tty = sys.stdout.isatty()
-    is_err_tty = sys.stderr.isatty()
-
-    # We'll read in chunks from both stdout and stderr in a loop.
-    # This example uses a single loop that tries to read both streams
-    # repeatedly. For large outputs, consider threading or select().
-
-    while True:
-        return_code = proc.poll()
-
-        # Read some data from stdout (if available)
-        chunk_out = proc.stdout.read(1024) if proc.stdout else ""
-        if chunk_out:
-            out_buffer.append(chunk_out)
-            if is_out_tty:
-                sys.stdout.write(chunk_out)
-                sys.stdout.flush()
-
-        # Read some data from stderr (if available)
-        chunk_err = proc.stderr.read(1024) if proc.stderr else ""
-        if chunk_err:
-            err_buffer.append(chunk_err)
-            if is_err_tty:
-                sys.stderr.write(chunk_err)
-                sys.stderr.flush()
-
-        if return_code is not None and not chunk_out and not chunk_err:
-            # No more data from pipes, process ended
-            break
-
-    return_code = proc.wait()
-
-    if return_code != 0:
-        stderr_str = "".join(err_buffer).strip()
-        raise exc.BeforeLoadScriptError(
-            return_code,
-            os.path.abspath(script_file),  # NOQA: PTH100
-            stderr_str,
-        )
-
-    return return_code
-
-
 def oh_my_zsh_auto_title() -> None:
     """Give warning and offer to fix ``DISABLE_AUTO_TITLE``.