sync moved to modules

modules/sync/utils/fn.py

@@ -0,0 +1,45 @@
+import os
+from functools import reduce
+
+
+def constant(value):
+    return lambda _: value
+
+
+def combine(items):
+    if len(items) == 0:
+        return []
+
+    return reduce(
+        lambda total, i: total + i,
+        items
+    )
+
+
+def compose(*fns):
+    return lambda i: reduce(
+        lambda out, fn: fn(out),
+        fns, i
+    )
+
+
+first = lambda i: i[0] if len(i) > 0 else None
+
+
+def swap_ext(extension: str):
+    return lambda i: os.path.splitext(i)[0] + extension
+
+
+def map_cases(param, cases):
+    for predicate, fn in cases:
+        if predicate(param):
+            return fn(param)
+    return param
+
+
+def until(condition_fn, iter_fn, items, default_value=None):
+    for i in items:
+        result = iter_fn(i)
+        if condition_fn(result):
+            return result
+    return default_value