1 files changed, 63 insertions, 0 deletions
diff --git a/src/epy_reader/lib.py b/src/epy_reader/lib.py
new file mode 100644
index 0000000..b010323
--- /dev/null
+++ b/src/epy_reader/lib.py
@@ -0,0 +1,63 @@
+from typing import Any, Optional, Tuple
+from urllib.parse import urljoin, urlparse
+
+
+def is_url(string: str) -> bool:
+    try:
+        tmp = urlparse(string)
+        return all([tmp.scheme, tmp.netloc])
+    except ValueError:
+        return False
+
+
+def coerce_to_int(string: str) -> Optional[int]:
+    try:
+        return int(string)
+    except ValueError:
+        return None
+
+
+def truncate(teks: str, subtitution_text: str, maxlen: int, startsub: int = 0) -> str:
+    """
+    Truncate text
+
+    eg.
+    :param teks: 'This is long silly dummy text'
+    :param subtitution_text:  '...'
+    :param maxlen: 12
+    :param startsub: 3
+    :return: 'This...ly dummy text'
+    """
+    if startsub > maxlen:
+        raise ValueError("Var startsub cannot be bigger than maxlen.")
+    elif len(teks) <= maxlen:
+        return teks
+    else:
+        lensu = len(subtitution_text)
+        beg = teks[:startsub]
+        mid = (
+            subtitution_text
+            if lensu <= maxlen - startsub
+            else subtitution_text[: maxlen - startsub]
+        )
+        end = teks[startsub + lensu - maxlen :] if lensu < maxlen - startsub else ""
+        return beg + mid + end
+
+
+def tuple_subtract(tuple_one: Tuple[Any, ...], tuple_two: Tuple[Any, ...]) -> Tuple[Any, ...]:
+    """
+    Returns tuple with members in tuple_one
+    but not in tuple_two
+    """
+    return tuple(i for i in tuple_one if i not in tuple_two)
+
+
+def resolve_path(current_dir: str, relative_path: str) -> str:
+    """
+    Resolve path containing dots
+    eg. '/foo/bar/book.html' + '../img.png' = '/foo/img.png'
+    NOTE: '/' suffix is important to tell that current dir in 'bar'
+    """
+    # can also using os.path.normpath()
+    # but if the image in zipfile then posix path is mandatory
+    return urljoin(current_dir, relative_path)