feat: Handle user data on uninstall

build/installer.nsh

@@ -37,5 +37,82 @@
 ; `SetSilent silent` after its confirmation MessageBox, so we briefly restore
 ; the normal mode to show our own nsDialogs dialog.
 !macro customUnInstall
-  ; Placeholder; filled in the next commit.
+  ; Do nothing on upgrades: the old uninstaller is invoked with --updated by
+  ; the new installer and app data must survive the update.
+  ${ifNot} ${isUpdated}
+    ; Electron app data (caches, local storage, session state) are
+    ; regenerable: always remove them. The user-facing configuration lives in
+    ; the profile directory and is handled separately below.
+    RMDir /r "$APPDATA\Twake Desktop"
+    RMDir /r "$APPDATA\TwakeDesktop"
+
+    ; Never show a dialog on silent uninstalls (/S), e.g. scripted removals.
+    ${GetParameters} $R0
+    ${GetOptions} $R0 "/S" $R1
+    ${if} ${Errors}
+      ; Offer to remove the configuration only if there is one to remove.
+      ${ifNot} ${FileExists} "$PROFILE\.twake-desktop"
+      ${andIfNot} ${FileExists} "$PROFILE\.cozy-desktop"
+        Goto no_config_to_remove
+      ${endif}
+
+      SetSilent normal
+
+      ; French users get a French dialog, everyone else English. Custom
+      ; LangStrings cannot be merged into electron-builder's messages file,
+      ; so strings are selected at runtime.
+      ${if} $LANGUAGE == ${LANG_FRENCH}
+        StrCpy $R2 "Voulez-vous également supprimer la configuration de Twake Desktop (compte, paramètres et base de données locales) ?$\r$\n$\r$\nCochez la case pour tout supprimer. Laissez-la décochée pour conserver votre configuration en cas de réinstallation."
+        StrCpy $R3 "Supprimer la configuration"
+        StrCpy $R4 "Désinstallation de Twake Desktop"
+        StrCpy $R5 "Terminer"
+      ${else}
+        StrCpy $R2 "Do you also want to remove the Twake Desktop configuration (account, settings and local database)?$\r$\n$\r$\nCheck the box to remove everything. Leave it unchecked to keep your configuration in case you reinstall."
+        StrCpy $R3 "Remove configuration"
+        StrCpy $R4 "Twake Desktop uninstallation"
+        StrCpy $R5 "Finish"
+      ${endif}
+
+      nsDialogs::Create 1018
+      Pop $R6
+      ${if} $R6 == "error"
+        Goto dialog_done
+      ${endif}
+
+      ${NSD_CreateLabel} 0 0 100% 60u "$R2"
+      Pop $R7
+
+      ${NSD_CreateCheckbox} 0 70u 100% 12u "$R3"
+      Pop $R8
+      ; Unchecked by default: the configuration is kept unless the user
+      ; explicitly asks for its removal.
+
+      ${NSD_CreateButton} 70u 95u 30% 14u "$R5"
+      Pop $R9
+      ${NSD_OnClick} $R9 un.onRemoveConfigDialogOK
+
+      nsDialogs::Show
+
+      dialog_done:
+      SetSilent silent
+
+      no_config_to_remove:
+    ${endif}
+  ${endif}
 !macroend
+
+; Button click handler for the dialog above. The `un.` prefix is preserved
+; when electron-builder generates the uninstaller script, and the
+; BUILD_UNINSTALLER guard keeps it out of the main installer pass, where
+; NSIS would flag it as unused uninstaller code (warning 6020, fatal with
+; electron-builder's -WX).
+!ifdef BUILD_UNINSTALLER
+Function un.onRemoveConfigDialogOK
+  ${NSD_GetState} $R8 $R0
+  ${if} $R0 == ${BST_CHECKED}
+    RMDir /r "$PROFILE\.twake-desktop"
+    ; Legacy directory from when the app was named Cozy Desktop
+    RMDir /r "$PROFILE\.cozy-desktop"
+  ${endif}
+FunctionEnd
+!endif