feat: TranslationWorker QProcess for transart.py streaming

diff --git a/workers/translation_worker.py b/workers/translation_worker.py
new file mode 100644 (file)
index 0000000..e4caa35
--- /dev/null
+++ b/workers/translation_worker.py
@@ -0,0 +1,48 @@
+from __future__ import annotations
+from PyQt6.QtCore import QObject, QProcess, pyqtSignal
+from pathlib import Path
+
+class TranslationWorker(QObject):
+    log_line = pyqtSignal(str)
+    finished = pyqtSignal(bool, str)  # success, output_path
+    error = pyqtSignal(str)
+
+    def __init__(self, transart_script: Path, article_path: Path, direction: str, parent=None):
+        super().__init__(parent)
+        self._script = transart_script
+        self._article_path = article_path
+        self._direction = direction  # e.g. "it-en" or "en-it"
+        self._process = QProcess(self)
+        self._process.readyReadStandardOutput.connect(self._on_stdout)
+        self._process.readyReadStandardError.connect(self._on_stderr)
+        self._process.finished.connect(self._on_finished)
+
+    def start(self):
+        self._process.start("python3", [
+            str(self._script),
+            "--direction", self._direction,
+            str(self._article_path),
+        ])
+
+    def _on_stdout(self):
+        data = self._process.readAllStandardOutput().data().decode("utf-8", errors="replace")
+        for line in data.splitlines():
+            self.log_line.emit(line)
+
+    def _on_stderr(self):
+        data = self._process.readAllStandardError().data().decode("utf-8", errors="replace")
+        for line in data.splitlines():
+            self.log_line.emit(f"[stderr] {line}")
+
+    def _on_finished(self, exit_code: int, _):
+        success = exit_code == 0
+        path_str = str(self._article_path)
+        if "/it/" in path_str:
+            out = path_str.replace("/it/", "/en/", 1)
+        elif "/en/" in path_str:
+            out = path_str.replace("/en/", "/it/", 1)
+        else:
+            out = ""
+        if not success:
+            self.error.emit(f"transart.py exited with code {exit_code}")
+        self.finished.emit(success, out)