add log saving command

src/oterm/app/log_export.py

@@ -0,0 +1,43 @@
+from datetime import datetime
+
+from textual import on
+from textual.app import ComposeResult
+from textual.containers import Container
+from textual.screen import ModalScreen
+from textual.widgets import Input, Label
+
+from oterm.log import log_lines
+
+
+class LogExport(ModalScreen[str]):
+    file_name: str = ""
+    BINDINGS = [
+        ("escape", "cancel", "Cancel"),
+    ]
+
+    def __init__(self, file_name: str = "") -> None:
+        super().__init__()
+        if not file_name:
+            timestamp = datetime.now().strftime("%Y%m%d-%H%M%S")
+            file_name = f"oterm-logs-{timestamp}.txt"
+        self.file_name = file_name
+
+    def action_cancel(self) -> None:
+        self.dismiss()
+
+    @on(Input.Submitted)
+    async def on_submit(self, event: Input.Submitted) -> None:
+        if not event.value:
+            return
+
+        with open(event.value, "w", encoding="utf-8") as file:
+            for group, line in log_lines:
+                file.write(f"[{group.name}] {line}\n")
+
+        self.app.notify(f"Logs exported to {event.value}")
+        self.dismiss()
+
+    def compose(self) -> ComposeResult:
+        with Container(classes="screen-container short"):
+            yield Label("Export logs", classes="title")
+            yield Input(id="log-file-input", value=self.file_name)

src/oterm/app/log_viewer.py

@@ -13,11 +13,17 @@ class LogViewer(ModalScreen[str]):
 
     BINDINGS = [
         ("escape", "cancel", "Cancel"),
+        ("ctrl+s", "save_logs", "Save logs"),
     ]
 
     def action_cancel(self) -> None:
         self.dismiss()
 
+    def action_save_logs(self) -> None:
+        from oterm.app.log_export import LogExport
+
+        self.app.push_screen(LogExport())
+
     @debounce(0.5)
     async def log_update(self) -> None:
         widget = self.query_one(RichLog)