Rewrite hash_hardlink with argparse.

hash_hardlink.py

@@ -1,10 +1,16 @@
+import argparse
 import hashlib
 import os
 import send2trash
 import sys
 
+from voussoirkit import lazychain
 from voussoirkit import pathclass
+from voussoirkit import pipeable
 from voussoirkit import spinal
+from voussoirkit import vlogging
+
+log = vlogging.getLogger(__name__)
 
 def hash_file(file):
     hasher = hashlib.md5()
@@ -16,25 +22,31 @@ def hash_file(file):
             hasher.update(chunk)
     return hasher.hexdigest()
 
-def main(argv):
-    folders = [pathclass.Path(p) for p in argv]
+def hash_hardlink_argparse(args):
+    paths = [pathclass.Path(p) for p in pipeable.input_many(args.paths, strip=True, skip_blank=True)]
 
-    drives = set(os.path.splitdrive(folder.absolute_path)[0] for folder in folders)
+    drives = set(path.stat.st_dev for path in paths)
     if len(drives) != 1:
         raise ValueError('All paths must be on the same drive.')
 
+    files = lazychain.LazyChain()
+    for path in paths:
+        if path.is_file:
+            files.append(path)
+        elif path.is_dir:
+            files.extend(spinal.walk_generator(path))
+
     inodes = set()
     hashes = {}
 
-    for folder in folders:
-        for file in spinal.walk_generator(folder):
-            if file.stat.st_ino in inodes:
-                # This file is already a hardlink of another file we've seen.
-                continue
-            inodes.add(file.stat.st_ino)
-            h = hash_file(file)
-            print(file.absolute_path, h)
-            hashes.setdefault(h, []).append(file)
+    for file in files:
+        if file.stat.st_ino in inodes:
+            # This file is already a hardlink of another file we've seen.
+            continue
+        inodes.add(file.stat.st_ino)
+        h = hash_file(file)
+        print(file.absolute_path, h)
+        hashes.setdefault(h, []).append(file)
 
     hashes = {h: files for (h, files) in hashes.items() if len(files) > 1}
 
@@ -45,5 +57,16 @@ def main(argv):
             send2trash.send2trash(follower.absolute_path)
             os.link(leader.absolute_path, follower.absolute_path)
 
+def main(argv):
+    argv = vlogging.set_level_by_argv(log, argv)
+
+    parser = argparse.ArgumentParser(description=__doc__)
+
+    parser.add_argument('paths', nargs='+')
+    parser.set_defaults(func=hash_hardlink_argparse)
+
+    args = parser.parse_args(argv)
+    return args.func(args)
+
 if __name__ == '__main__':
     raise SystemExit(main(sys.argv[1:]))