qml: allow renaming wallets

Allows to rename a wallet file from the QML Wallet Details view.
This seems like a feature we should support as the use-case of a wallet can
change or maybe the user didn't think about a proper name when setting
up the wallet. Especially with lightning channels it is not possible to
restore from seed to change the name.

Fixes #4377

electrum/daemon.py

@@ -585,6 +585,17 @@ class Daemon(Logger):
             return True
         return False
 
+    def rename_wallet_file(self, old_path: str, new_path: str):
+        old_path = standardize_path(old_path)
+        new_path = standardize_path(new_path)
+        if os.path.exists(new_path):
+            raise ValueError("Wallet file already exists")
+        os.rename(old_path, new_path)
+        self.logger.debug(f'renamed wallet: {old_path} -> {new_path}')
+        self.update_recently_opened_wallets(old_path, remove=True)
+        if self.config.CURRENT_WALLET == old_path:
+            self.config.CURRENT_WALLET = new_path
+
     def stop_wallet(self, path: str) -> bool:
         """Returns True iff a wallet was found."""
         assert util.get_running_loop() != util.get_asyncio_loop(), 'must not be called from asyncio thread'

electrum/gui/qml/components/WalletDetails.qml

@@ -130,6 +130,64 @@ Pane {
                         visible: Daemon.currentWallet
                         columns: 2
 
+                        Label {
+                            Layout.columnSpan: 2
+                            Layout.topMargin: constants.paddingSmall
+                            text: qsTr('Name')
+                            color: Material.accentColor
+                        }
+
+                        TextHighlightPane {
+                            id: walletNameContent
+                            property bool editmode: false
+                            Layout.columnSpan: 2
+                            Layout.fillWidth: true
+
+                            RowLayout {
+                                width: parent.width
+                                Label {
+                                    visible: !walletNameContent.editmode
+                                    text: Daemon.currentWallet.name
+                                    wrapMode: Text.Wrap
+                                    Layout.fillWidth: true
+                                    font.pixelSize: constants.fontSizeLarge
+                                }
+                                ToolButton {
+                                    visible: !walletNameContent.editmode
+                                    icon.source: '../../icons/pen.png'
+                                    icon.color: 'transparent'
+                                    onClicked: {
+                                        walletNameEdit.text = Daemon.currentWallet.name
+                                        walletNameContent.editmode = true
+                                        walletNameEdit.focus = true
+                                    }
+                                }
+                                TextField {
+                                    id: walletNameEdit
+                                    visible: walletNameContent.editmode
+                                    Layout.fillWidth: true
+                                    font.pixelSize: constants.fontSizeLarge
+                                }
+                                ToolButton {
+                                    visible: walletNameContent.editmode
+                                    icon.source: '../../icons/confirmed.png'
+                                    icon.color: enabled ? 'transparent' : constants.mutedForeground
+                                    enabled: walletNameEdit.text !== Daemon.currentWallet.name
+                                             && Daemon.isValidWalletName(walletNameEdit.text)
+                                    onClicked: {
+                                        walletNameContent.editmode = false
+                                        Daemon.renameWallet(walletNameEdit.text)
+                                    }
+                                }
+                                ToolButton {
+                                    visible: walletNameContent.editmode
+                                    icon.source: '../../icons/closebutton.png'
+                                    icon.color: 'transparent'
+                                    onClicked: walletNameContent.editmode = false
+                                }
+                            }
+                        }
+
                         Label {
                             Layout.columnSpan: 2
                             Layout.topMargin: constants.paddingSmall
@@ -526,6 +584,14 @@ Pane {
                 dialog.open()
             }
         }
+        function onWalletRenameError(message) {
+            var dialog = app.messageDialog.createObject(app, {
+                title: qsTr('Error'),
+                iconSource: Qt.resolvedUrl('../../icons/warning.png'),
+                text: message
+            })
+            dialog.open()
+        }
     }
 
     Connections {

electrum/gui/qml/qedaemon.py

@@ -150,6 +150,7 @@ class QEDaemon(AuthMixin, QObject):
     walletRequiresPassword = pyqtSignal([str, str], arguments=['name', 'path'])
     walletOpenError = pyqtSignal([str], arguments=["error"])
     walletDeleteError = pyqtSignal([str, str], arguments=['code', 'message'])
+    walletRenameError = pyqtSignal([str], arguments=['message'])
 
     def __init__(self, daemon: 'Daemon', plugins: 'Plugins', parent=None):
         super().__init__(parent)
@@ -310,6 +311,34 @@ class QEDaemon(AuthMixin, QObject):
 
         self.availableWallets.remove_wallet(path)
 
+    @pyqtSlot(str, result=bool)
+    def isValidWalletName(self, wallet_name: str) -> bool:
+        if not wallet_name:
+            return False
+        if self.availableWallets.wallet_name_exists(wallet_name):
+            return False
+        # ensure wallet_name is not interpreted as path
+        if os.path.basename(wallet_name) != wallet_name:  # '/foo/bar/' returns 'bar'
+            return False
+        return True
+
+    @pyqtSlot(str)
+    def renameWallet(self, new_name: str):
+        wallet = self._current_wallet
+        assert wallet, "name change without wallet?"
+        old_path = standardize_path(wallet.wallet.storage.path)
+        wallet_dir = os.path.dirname(old_path)
+        new_path = standardize_path(os.path.join(wallet_dir, new_name))
+        if old_path == new_path:
+            return
+        self._current_wallet = None
+        self.daemon.stop_wallet(old_path)
+        try:
+            self.daemon.rename_wallet_file(old_path, new_path)
+        except Exception as e:
+            self.walletRenameError.emit(_('Error renaming wallet:\n') + str(e))
+        self.walletLoaded.emit(None, None)
+
     @pyqtProperty(bool, notify=loadingChanged)
     def loading(self):
         return self._loading