Add pipeline code

_pipeline/settings.py

@@ -0,0 +1,30 @@
+"""Load settings.yaml. One place for every tunable value."""
+import os
+import yaml
+
+PIPELINE_DIR = os.path.dirname(os.path.abspath(__file__))
+REPO_ROOT = os.path.dirname(PIPELINE_DIR)
+
+
+def load(path=None):
+    path = path or os.environ.get("AUDIOBOOK_SETTINGS") or os.path.join(PIPELINE_DIR, "settings.yaml")
+    with open(path, encoding="utf-8") as f:
+        cfg = yaml.safe_load(f)
+    cfg["_path"] = path
+    return cfg
+
+
+def resolve(cfg, key):
+    """A path setting as an absolute path (relative values are relative to the repo root)."""
+    value = cfg[key]
+    return value if os.path.isabs(value) else os.path.join(REPO_ROOT, value)
+
+
+def audio_dir(cfg, book_dir):
+    """Where audio for a book goes: the book folder by default, else under archive_dir."""
+    if not cfg.get("archive_dir"):
+        return os.path.join(book_dir, "audio")
+    base = cfg["archive_dir"]
+    base = base if os.path.isabs(base) else os.path.join(REPO_ROOT, base)
+    parts = os.path.normpath(book_dir).split(os.sep)[-2:]   # <author>/<book>
+    return os.path.join(base, *parts, "audio")