[ADD] base: new wizard to uninstall a module (#17284)

The "Uninstall" button on the module form no longer changes the state of
modules, so that cancelling the wizard will not unexpectedly perform the
uninstallation.  The uninstallation is performed only by clicking on the
"Confirm" button on the wizard.

Moreover, the wizard provides clearer information about the impact of the
uninstallation: what apps/modules will be uninstalled and what documents
(models) will be lost.

3 files changed, 108 insertions, 0 deletions

diff --git a/odoo/addons/base/module/wizard/__init__.py b/odoo/addons/base/module/wizard/__init__.py
index 72162359952..ece1521da87 100644
--- a/odoo/addons/base/module/wizard/__init__.py
+++ b/odoo/addons/base/module/wizard/__init__.py
@@ -5,5 +5,6 @@ from . import base_module_update
 from . import base_language_install
 from . import base_import_language
 from . import base_module_upgrade
+from . import base_module_uninstall
 from . import base_export_language
 from . import base_update_translations
diff --git a/odoo/addons/base/module/wizard/base_module_uninstall.py b/odoo/addons/base/module/wizard/base_module_uninstall.py
new file mode 100644
index 00000000000..1168e57341c
--- /dev/null
+++ b/odoo/addons/base/module/wizard/base_module_uninstall.py
@@ -0,0 +1,55 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models
+
+
+class BaseModuleUninstall(models.TransientModel):
+    _name = "base.module.uninstall"
+    _description = "Module Uninstallation"
+
+    show_all = fields.Boolean()
+    module_id = fields.Many2one('ir.module.module', string="Module", required=True,
+                                domain=[('state', 'in', ['installed', 'to upgrade', 'to install'])])
+    module_ids = fields.Many2many('ir.module.module', string="Impacted modules",
+                                  compute='_compute_module_ids')
+    model_ids = fields.Many2many('ir.model', string="Impacted data models",
+                                 compute='_compute_model_ids')
+
+    def _get_modules(self):
+        """ Return all the modules impacted by self. """
+        return self.module_id.downstream_dependencies(self.module_id)
+
+    @api.depends('module_id', 'show_all')
+    def _compute_module_ids(self):
+        for wizard in self:
+            modules = wizard._get_modules()
+            wizard.module_ids = modules if wizard.show_all else modules.filtered('application')
+
+    def _get_models(self):
+        """ Return the models (ir.model) to consider for the impact. """
+        return self.env['ir.model'].search([('transient', '=', False)])
+
+    @api.depends('module_ids')
+    def _compute_model_ids(self):
+        ir_models = self._get_models()
+        ir_models_xids = ir_models._get_external_ids()
+        for wizard in self:
+            if wizard.module_id:
+                module_names = set(wizard._get_modules().mapped('name'))
+                # find the models that have all their XIDs in the given modules
+                def lost(model):
+                    return all(xid.split('.')[0] in module_names
+                               for xid in ir_models_xids.get(model.id, ()))
+                self.model_ids = ir_models.filtered(lost).sorted('name')
+
+    @api.onchange('module_id')
+    def _onchange_module_id(self):
+        # if we select a technical module, show technical modules by default
+        if not self.module_id.application:
+            self.show_all = True
+
+    @api.multi
+    def action_uninstall(self):
+        modules = self.mapped('module_id')
+        return modules.button_immediate_uninstall()
diff --git a/odoo/addons/base/module/wizard/base_module_uninstall_view.xml b/odoo/addons/base/module/wizard/base_module_uninstall_view.xml
new file mode 100644
index 00000000000..43da6a2bcde
--- /dev/null
+++ b/odoo/addons/base/module/wizard/base_module_uninstall_view.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data>
+
+        <record id="view_base_module_uninstall" model="ir.ui.view">
+            <field name="name">Uninstall module</field>
+            <field name="model">base.module.uninstall</field>
+            <field name="arch" type="xml">
+                <form string="Uninstall module">
+                    <field name="module_id" groups="base.group_no_one"/>
+                    <h3>The following apps will be uninstalled</h3>
+                    <field name="show_all"/> Show technical modules
+                    <field name="module_ids" mode="kanban">
+                        <kanban create="false">
+                            <field name="icon"/>
+                            <field name="name"/>
+                            <field name="shortdesc"/>
+                            <field name="summary"/>
+                            <templates>
+                                <t t-name="kanban-box">
+                                    <div class="oe_module_vignette">
+                                        <img t-attf-src="#{record.icon.value}"
+                                             class="oe_module_icon" style="width: 60px; height: 60px"/>
+                                        <div class="oe_module_desc" style="padding-left: 70px">
+                                            <h4><field name="shortdesc"/></h4>
+                                            <p class="oe_module_name">
+                                                <t t-if="record.summary.raw_value"><field name="summary"/><br/></t>
+                                                <i><field name="name" groups="base.group_no_one"/></i>
+                                            </p>
+                                        </div>
+                                    </div>
+                                </t>
+                            </templates>
+                        </kanban>
+                    </field>
+                    <h3>The following documents will be permanently lost</h3>
+                    <field name="model_ids">
+                        <tree string="Models">
+                            <field name="name" string="Document"/>
+                            <field name="count"/>
+                        </tree>
+                    </field>
+                    <footer>
+                        <button string="Confirm" class="btn-primary" type="object" name="action_uninstall"/>
+                        <button string="Cancel" class="btn-default" special="cancel"/>
+                    </footer>
+                </form>
+            </field>
+        </record>
+
+    </data>
+</odoo>