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#!/usr/bin/python3
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
"""fileops <op> <outdir> <file...>
One local operation on files, for the assistant canvas's Do row. Prints one
JSON line, {"ok": true, "out": [paths]} or {"ok": false, "error": "..."}.
Each result is written under a temporary name and renamed into place, to
the first free name; SIGTERM kills the running tool and removes what was
half written.
"""
import json
import os
import shutil
import signal
import subprocess
import sys
import tarfile
import zipfile
current = None # the running tool, killed with its group on SIGTERM
temps = [] # partial results to remove if we do not finish
ARCHIVE_EXTS = (".tar.gz", ".tar.xz", ".tar.bz2", ".tar.zst", ".tgz", ".txz",
".zip", ".tar", ".7z", ".rar", ".gz", ".xz", ".bz2", ".zst")
class Fail(Exception):
pass
def finish(result, code):
print(json.dumps(result), flush=True)
sys.exit(code)
def stop(*_):
if current is not None:
try:
os.killpg(current.pid, signal.SIGKILL)
except ProcessLookupError:
pass
for t in temps:
shutil.rmtree(t, ignore_errors=True) if os.path.isdir(t) else _unlink(t)
finish({"ok": False, "error": "stopped"}, 1)
def _unlink(path):
try:
os.unlink(path)
except FileNotFoundError:
pass
def run(argv):
# Own process group, so a stop takes ffmpeg and its children too.
global current
if shutil.which(argv[0]) is None:
hint = ": link it into ~/bin" if argv[0] == "trackcrop" else ""
raise Fail(f"{argv[0]} not found{hint}")
current = subprocess.Popen(argv, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, text=True, start_new_session=True)
out, err = current.communicate()
rc, current = current.returncode, None
if rc:
last = err.strip().splitlines()[-1:] or [f"exit status {rc}"]
raise Fail(f"{argv[0]}: {last[0]}"[:300])
return out
def split(name):
# ("report", ".pdf"), keeping a compound suffix whole: "a.tar.gz".
low = name.lower()
for ext in (".tar.gz", ".tar.xz", ".tar.bz2", ".tar.zst"):
if low.endswith(ext):
return name[:-len(ext)], name[-len(ext):]
stem, ext = os.path.splitext(name)
return stem, ext
def stem(path):
name = os.path.basename(path)
for ext in ARCHIVE_EXTS:
if name.lower().endswith(ext) and len(name) > len(ext):
return name[:-len(ext)]
return os.path.splitext(name)[0]
def free(outdir, name):
path = os.path.join(outdir, name)
base, ext = split(name)
n = 1
while os.path.lexists(path):
path = os.path.join(outdir, f"{base} ({n}){ext}")
n += 1
return path
def make(outdir, name, build, folder=False):
# build(tmp) writes the result at tmp; it keeps the suffix, which is how
# ffmpeg and magick choose the format.
tmp = os.path.join(outdir, f".fileops-{os.getpid()}-{len(temps)}{split(name)[1]}")
temps.append(tmp)
if folder:
os.mkdir(tmp)
build(tmp)
final = free(outdir, name)
os.rename(tmp, final)
temps.remove(tmp)
return final
def audio_codec(path):
return run(["ffprobe", "-v", "error", "-select_streams", "a:0", "-show_entries",
"stream=codec_name", "-of", "csv=p=0", path]).strip()
# Copied as it is when the track already is one of these.
COPY = {"aac": ".m4a", "mp3": ".mp3", "opus": ".opus"}
GIF = "fps=12,scale=480:-1:flags=lanczos,split[a][b];[a]palettegen[p];[b][p]paletteuse"
# This ffmpeg has no libx264 and no AAC encoder: H.264 is the GPU's, through
# VAAPI, with MP3 audio, which MP4 carries.
VAAPI = ["-vaapi_device", "/dev/dri/renderD128", "-vf", "format=nv12,hwupload",
"-c:v", "h264_vaapi", "-qp", "23"]
def each(op, outdir, f):
s, ext = stem(f), os.path.splitext(f)[1]
ff = ["ffmpeg", "-v", "error", "-y", "-i", f]
if op == "pdf-images":
return make(outdir, f"{s} (pages)",
lambda t: run(["pdftoppm", "-r", "150", "-png", f, os.path.join(t, "page")]),
folder=True)
if op == "audio":
codec = audio_codec(f)
if not codec:
raise Fail(f"{os.path.basename(f)} has no audio track")
if codec in COPY:
return make(outdir, s + COPY[codec], lambda t: run(ff + ["-vn", "-c:a", "copy", t]))
return make(outdir, s + ".mp3", lambda t: run(ff + ["-vn", "-c:a", "libmp3lame", "-q:a", "2", t]))
if op == "mp4":
return make(outdir, s + ".mp4",
lambda t: run(ff + VAAPI + ["-c:a", "libmp3lame", "-q:a", "2",
"-movflags", "+faststart", t]))
if op == "webm":
return make(outdir, s + ".webm",
lambda t: run(ff + ["-c:v", "libvpx-vp9", "-b:v", "0", "-crf", "33",
"-c:a", "libopus", t]))
if op == "gif":
return make(outdir, s + ".gif", lambda t: run(ff + ["-vf", GIF, t]))
if op == "trackcrop":
return make(outdir, f"{s} (tracked).mp4", lambda t: run(["trackcrop", f, t]))
if op in ("png", "jpeg", "webp"):
return make(outdir, f"{s}.{'jpg' if op == 'jpeg' else op}", lambda t: run(["magick", f, t]))
if op == "half":
return make(outdir, f"{s} (50%){ext}", lambda t: run(["magick", f, "-resize", "50%", t]))
if op == "extract":
return make(outdir, s, lambda t: run(["bsdtar", "-xf", f, "-C", t]), folder=True)
raise Fail(f"unknown operation {op}")
def compress(op, outdir, files):
ext = {"zip": ".zip", "tgz": ".tar.gz", "txz": ".tar.xz", "tbz2": ".tar.bz2"}[op]
name = (stem(files[0]) if len(files) == 1 else "archive") + ext
def build(t):
if op == "zip":
with zipfile.ZipFile(t, "w", zipfile.ZIP_DEFLATED) as z:
for f in files:
if os.path.isdir(f):
for root, _, names in os.walk(f):
for n in names:
p = os.path.join(root, n)
z.write(p, os.path.relpath(p, os.path.dirname(f)))
else:
z.write(f, os.path.basename(f))
else:
with tarfile.open(t, "w:" + {"tgz": "gz", "txz": "xz", "tbz2": "bz2"}[op]) as tar:
for f in files:
tar.add(f, arcname=os.path.basename(f))
return make(outdir, name, build)
def main(argv):
if len(argv) < 3:
raise Fail("usage: fileops <op> <outdir> <file...>")
op, outdir, files = argv[0], argv[1], argv[2:]
if not os.path.isabs(outdir):
raise Fail("the output folder must be an absolute path")
for f in files:
if not os.path.exists(f):
raise Fail(f"cannot read {os.path.basename(f)}")
os.makedirs(outdir, exist_ok=True)
if op == "pdf-merge":
if len(files) < 2:
raise Fail("merging needs two or more PDFs")
return [make(outdir, "merged.pdf",
lambda t: run(["qpdf", "--empty", "--pages", *files, "--", t]))]
if op in ("zip", "tgz", "txz", "tbz2"):
return [compress(op, outdir, files)]
return [each(op, outdir, f) for f in files]
if __name__ == "__main__":
signal.signal(signal.SIGTERM, stop)
try:
out = main(sys.argv[1:])
except Fail as e:
for t in temps:
shutil.rmtree(t, ignore_errors=True) if os.path.isdir(t) else _unlink(t)
finish({"ok": False, "error": str(e)}, 1)
except Exception as e: # a bug: say so rather than hang the card
for t in temps:
shutil.rmtree(t, ignore_errors=True) if os.path.isdir(t) else _unlink(t)
finish({"ok": False, "error": f"{type(e).__name__}: {e}"}, 1)
finish({"ok": True, "out": out}, 0)
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