ui: import and export .pqw files from the menus

The basic interface gets two main menu entries that ask for a path.
The curses roster gets [I] Import and [E] Export, with a new text input
view for the path, prefilled with NAME.pqw on export, and a message
view for the outcome and any warnings. The README explains how to move
characters to and from the web version.

Resolves #21

pqcli/ui/curses/__init__.py

@@ -3,9 +3,10 @@ import curses
 import os
 import signal
 import time
+from pathlib import Path
 from types import FrameType
 
-from pqcli import lingo
+from pqcli import lingo, pqw
 from pqcli.config import Class, Race
 from pqcli.game_data import GameData
 from pqcli.mechanic import Player, Stats, create_player
@@ -32,7 +33,9 @@ from pqcli.ui.curses.views import (
     ChooseCharacterView,
     ConfirmView,
     GameView,
+    MessageView,
     RosterView,
+    TextInputView,
 )
 
 
@@ -79,6 +82,8 @@ class CursesUserInterface(BaseUserInterface):
         self._roster_view.on_create += self._switch_to_create_char_name_view
         self._roster_view.on_delete += self._switch_to_delete_char_view
         self._roster_view.on_play += self._switch_to_play_view
+        self._roster_view.on_import += self._switch_to_import_view
+        self._roster_view.on_export += self._switch_to_export_char_view
         self._roster_view.on_quit += self._quit
         self._view: BaseView = self._roster_view
         self._view.start()
@@ -182,6 +187,58 @@ class CursesUserInterface(BaseUserInterface):
         view.on_confirm += self._switch_to_game_view
         self._switch_view(view)
 
+    def _switch_to_import_view(self) -> None:
+        view = TextInputView(self._screen, "Import from .pqw file:", "")
+        view.on_cancel += self._switch_to_roster_view
+        view.on_confirm += self._import_character
+        self._switch_view(view)
+
+    def _switch_to_export_char_view(self) -> None:
+        view = ChooseCharacterView(
+            self._screen, self.roster, "Choose character to export"
+        )
+        view.on_cancel += self._switch_to_roster_view
+        view.on_confirm += self._switch_to_export_file_view
+        self._switch_view(view)
+
+    def _switch_to_export_file_view(self, player: Player) -> None:
+        view = TextInputView(
+            self._screen,
+            f"Export {player.name} to .pqw file:",
+            pqw.default_file_name(player),
+        )
+        view.on_cancel += self._switch_to_export_char_view
+        view.on_confirm += lambda path: self._export_character(player, path)
+        self._switch_view(view)
+
+    def _switch_to_message_view(self, message: str) -> None:
+        view = MessageView(self._screen, message)
+        view.on_close += self._switch_to_roster_view
+        self._switch_view(view)
+
+    def _import_character(self, path: str) -> None:
+        try:
+            player, warnings = pqw.read_file(
+                Path(path).expanduser(), self.data
+            )
+        except pqw.PqwError as ex:
+            self._switch_to_message_view(f"Cannot import: {ex}")
+            return
+        self.roster.players.append(player)
+        if self.args.use_saves:
+            self.roster.save()
+        self._switch_to_message_view(
+            "\n".join([f"Imported {player.name}.", *warnings])
+        )
+
+    def _export_character(self, player: Player, path: str) -> None:
+        try:
+            pqw.write_file(player, Path(path).expanduser(), self.data)
+        except pqw.PqwError as ex:
+            self._switch_to_message_view(f"Cannot export: {ex}")
+            return
+        self._switch_to_message_view(f"Exported {player.name} to {path}.")
+
     def _switch_to_game_view(self, player: Player) -> None:
         view = GameView(
             self._screen, self.roster, player, self.args, self.data

pqcli/ui/curses/views/__init__.py

@@ -8,7 +8,9 @@ from .create_character_view import (
     ChooseCharacterStatsView,
 )
 from .game_view import GameView
+from .message_view import MessageView
 from .roster_view import RosterView
+from .text_input_view import TextInputView
 
 __all__ = [
     "BaseView",
@@ -19,5 +21,7 @@ __all__ = [
     "ChooseCharacterRaceView",
     "ChooseCharacterStatsView",
     "GameView",
+    "MessageView",
     "RosterView",
+    "TextInputView",
 ]

pqcli/ui/curses/views/message_view.py

@@ -0,0 +1,53 @@
+import curses
+import curses.ascii
+import textwrap
+
+from pqcli.ui.curses.event_handler import EventHandler
+from pqcli.ui.curses.util import KEYS_CANCEL, Choice
+from pqcli.ui.curses.widgets import Menu
+
+from .base_view import BaseView
+
+
+class MessageView(BaseView):
+    """Show a message until it is dismissed."""
+
+    def __init__(self, screen: curses.window, message: str) -> None:
+        super().__init__(screen)
+
+        self.message = message
+        self.on_close = EventHandler[[]]()
+
+        self.choices: list[Choice] = [
+            Choice(
+                keys=[curses.ascii.NL, *KEYS_CANCEL],
+                desc="[Enter] OK",
+                callback=self.on_close,
+            ),
+        ]
+
+    def start(self) -> None:
+        scr_height, scr_width = self.screen.getmaxyx()
+        self.screen.erase()
+        self.screen.noutrefresh()
+
+        width = max(20, scr_width - 6)
+        header = "\n".join(
+            "\n".join(textwrap.wrap(line, width) or [""])
+            for line in self.message.split("\n")
+        )
+        self.main_menu = Menu(
+            header=header,
+            choices=self.choices,
+            active_choice=0,
+            scr_height=scr_height,
+            scr_width=scr_width,
+        )
+        self.main_menu.render()
+
+    def stop(self) -> None:
+        self.main_menu.stop()
+
+    def keypress(self, key: int) -> None:
+        self.main_menu.keypress(key)
+        self.main_menu.render()

pqcli/ui/curses/views/roster_view.py

@@ -57,6 +57,8 @@ class RosterView(BaseView):
         self.on_create = EventHandler[[]]()
         self.on_play = EventHandler[[]]()
         self.on_delete = EventHandler[[]]()
+        self.on_import = EventHandler[[]]()
+        self.on_export = EventHandler[[]]()
         self.on_quit = EventHandler[[]]()
 
         self.choices: list[Choice] = [
@@ -75,6 +77,16 @@ class RosterView(BaseView):
                 desc="[D] Delete character",
                 callback=self.on_delete,
             ),
+            Choice(
+                keys=list(map(ord, "iI")),
+                desc="[I] Import character (.pqw)",
+                callback=self.on_import,
+            ),
+            Choice(
+                keys=list(map(ord, "eE")),
+                desc="[E] Export character (.pqw)",
+                callback=self.on_export,
+            ),
             Choice(
                 keys=list(KEYS_CANCEL), desc="[Q] Quit", callback=self.on_quit
             ),

pqcli/ui/curses/views/text_input_view.py

@@ -0,0 +1,73 @@
+import curses
+import curses.ascii
+
+from pqcli.ui.curses.event_handler import EventHandler
+from pqcli.ui.curses.views.base_view import BaseView
+
+
+class TextInputView(BaseView):
+    """Ask for one line of text, such as a file name."""
+
+    def __init__(self, screen: curses.window, title: str, text: str) -> None:
+        super().__init__(screen)
+
+        self.on_cancel = EventHandler[[]]()
+        self.on_confirm = EventHandler[[str]]()
+
+        self._title = title
+        self._text = text
+        self._win: curses.window | None = None
+        self._text_win: curses.window | None = None
+
+    def start(self) -> None:
+        self.screen.erase()
+        self.screen.noutrefresh()
+
+        scr_height, scr_width = self.screen.getmaxyx()
+        h = 6
+        w = min(60, scr_width - 4)
+        y = (scr_height - h - 2) // 2
+        x = (scr_width - w - 2) // 2
+        self._win = curses.newwin(h + 2, w + 2, y, x)
+        self._text_win = curses.newwin(3, w + 2, y + 2, x - 1)
+        self._render()
+
+    def stop(self) -> None:
+        self._win = None
+        self._text_win = None
+
+    def keypress(self, key: int) -> None:
+        if key == curses.ascii.ESC:
+            self.on_cancel()
+            return
+        if key == curses.ascii.NL:
+            text = self._text.strip()
+            if text:
+                self.on_confirm(text)
+            else:
+                self.on_cancel()
+            return
+        if key in {curses.KEY_BACKSPACE, curses.ascii.DEL}:
+            self._text = self._text[:-1]
+        elif key == curses.ascii.ETB:  # ^w
+            self._text = ""
+        elif curses.ascii.isprint(key):
+            self._text += chr(key)
+        self._render()
+
+    def _render(self) -> None:
+        if not self._win or not self._text_win:
+            return
+
+        self._win.erase()
+        self._win.addstr(0, 0, self._title)
+        self._win.addstr(5, 0, "[Enter] Continue")
+        self._win.addstr(6, 0, "[Esc  ] Cancel")
+        self._win.refresh()
+
+        width = self._text_win.getmaxyx()[1] - 2
+        self._text_win.erase()
+        self._text_win.box()
+        # keep the end of long paths in view
+        self._text_win.addnstr(1, 1, self._text[-width + 1 :], width)
+        self._text_win.refresh()