Add concat_video and rm-empty-dirs

Some utilities I use from time to time

assets/default/bin/concat_video

@@ -0,0 +1,133 @@
+#! /usr/bin/env python3
+
+import re
+import subprocess
+from argparse import ArgumentParser
+from pathlib import Path
+from subprocess import check_output, CalledProcessError
+from typing import List, Dict, Optional
+
+
+FILELIST = Path("./concat-files.txt")
+DEFAULT_SLUG_PATTERN = "^(.+[^0-9])[0-9]+\\.[a-zA-Z0-9]+$"
+DEFAULT_NAME_PATTERN = "\\1"
+
+
+def call_output(*popenargs, **kwargs):
+    """Similar to check_output, but instead returns output and exception"""
+    # So we can capture complete output, redirect sderr to stdout
+    kwargs.setdefault('stderr', subprocess.STDOUT)
+    output, ex = None, None
+    try:
+        output = check_output(*popenargs, **kwargs)
+    except CalledProcessError as e:
+        output, ex = e.output, e
+
+    output = output.rstrip(b'\n')
+    return output, ex
+
+
+def write_file_list(file_list: Path, files: List[Path]):
+    file_list.write_text("\n".join(list((
+        f"file '{str(f.relative_to(file_list.parent))}'"
+        # for path, don't reverse the files
+        # for f in reversed(files)
+        for f in files
+    ))))
+
+
+def concat_files(output_file: Path, files: List[Path]) -> subprocess.CompletedProcess:
+    file_list = output_file.with_suffix(".txt")
+    output_file_tmp = output_file.with_suffix(".tmp" + output_file.suffix)
+    write_file_list(file_list, files)
+    result = subprocess.run([
+        "ffmpeg",
+        "-f",
+        "concat",
+        "-safe",
+        "0",
+        "-i",
+        str(file_list),
+        "-codec",
+        "copy",
+        str(output_file_tmp),
+    ])
+
+    print(result)
+    if result.returncode == 0:
+        output_file_tmp.rename(output_file)
+
+    return result
+
+
+def extract_slug(
+    f: Path,
+    pattern: str=DEFAULT_SLUG_PATTERN,
+    name: str=DEFAULT_NAME_PATTERN,
+) -> Optional[str]:
+    result = re.search(pattern, f.name)
+    if not result:
+        return None
+
+    return result.expand(name)
+
+
+def main():
+    parser = ArgumentParser(description="Merge video files")
+    parser.add_argument("paths", metavar="path", nargs="+")
+    parser.add_argument("--write", action="store_true")
+    parser.add_argument("--clean", action="store_true")
+    parser.add_argument("--pattern", default=DEFAULT_SLUG_PATTERN)
+    parser.add_argument("--name", default=DEFAULT_NAME_PATTERN)
+    args = parser.parse_args()
+
+    paths = [Path(path).resolve() for path in args.paths]
+    # print(paths)
+
+    if any(path.is_dir() for path in paths) and any(path.is_file() for path in paths):
+        raise ValueError("Cannot mix lists of files and paths")
+
+    if all(path.is_file() for path in paths):
+        slug = extract_slug(paths[0], args.pattern, args.name)
+        output_file = Path.cwd() / f"{slug.strip()}{paths[0].suffix}"
+        result = concat_files(output_file, list(paths))
+        result.check_returncode()
+        return
+
+    for path in paths:
+        seen_slugs: Dict[str, List[Path]] = {}
+        for file in path.glob("*.*"):
+            slug = extract_slug(file, args.pattern, args.name)
+            if not slug:
+                continue
+            seen_slugs.setdefault(slug, []).append(file)
+
+        for slug, parts in seen_slugs.items():
+            if len(parts) < 2:
+                continue
+            output_file = path / f"{slug.strip()}{parts[0].suffix}"
+            if output_file.exists():
+                print(output_file, "already exists...")
+                if args.write and args.clean:
+                    print("Cleaning parts...")
+                    for part in parts:
+                        part.unlink()
+                else:
+                    print("dry run")
+                continue
+
+            print(f"Merging {str(output_file)}:")
+            parts.sort(key=lambda x: str(x))
+            for part in parts:
+                print("\t"+str(part))
+
+            if args.write:
+                result = concat_files(output_file, parts)
+                result.check_returncode()
+                pass
+            else:
+                print("dry run")
+
+
+if __name__ == "__main__":
+    main()

assets/default/bin/rm-empty-dirs

@@ -0,0 +1,41 @@
+#! /usr/bin/env python3
+import sys
+from pathlib import Path
+
+
+def delete_empty(p: Path) -> bool:
+    if p.is_file():
+        print(f"{p} is a file, will not delete parent dirs")
+        return False
+
+    if not p.is_dir():
+        raise ValueError(f"unknown type {p}")
+
+    for child in p.iterdir():
+        if not delete_empty(child):
+            print(f"Skipping delete of {p}")
+            return False
+
+    p.rmdir()
+
+    return True
+
+
+def main() -> None:
+    paths = [Path(arg) for arg in sys.argv[1:]]
+    if not paths:
+        print(
+            "\n".join(
+                (
+                    "Usage: rm-empty-dirs path [path...]",
+                    "",
+                    "Recursively deletes any empty dirs using a depth first search.",
+                )
+            )
+        )
+    for path in paths:
+        delete_empty(path)
+
+
+if __name__ == "__main__":
+    main()