[geary/mjog/mail-merge-plugin: 1/12] Plugins: Add initial MailMerge plugin outline

[Michael Gratton <mjog src gnome org>]

commit 9531f952197e10606f7b184352698f508d491f4a
Author: Michael Gratton <mike vee net>
Date:   Mon Apr 27 22:55:53 2020 +1000

    Plugins: Add initial MailMerge plugin outline

 .../plugin/mail-merge/mail-merge.plugin.desktop.in |   5 +
 src/client/plugin/mail-merge/mail-merge.vala       | 196 +++++++++++++++++++++
 src/client/plugin/mail-merge/meson.build           |  27 +++
 src/client/plugin/meson.build                      |   1 +
 4 files changed, 229 insertions(+)
---
diff --git a/src/client/plugin/mail-merge/mail-merge.plugin.desktop.in 
b/src/client/plugin/mail-merge/mail-merge.plugin.desktop.in
new file mode 100644
index 00000000..26ef3323
--- /dev/null
+++ b/src/client/plugin/mail-merge/mail-merge.plugin.desktop.in
@@ -0,0 +1,5 @@
+[Plugin]
+Module=mail-merge
+Depends=email-templates
+Name=Mail Merge
+Description=Fill in and send email templates using a spreadsheet
diff --git a/src/client/plugin/mail-merge/mail-merge.vala b/src/client/plugin/mail-merge/mail-merge.vala
new file mode 100644
index 00000000..c04fc56a
--- /dev/null
+++ b/src/client/plugin/mail-merge/mail-merge.vala
@@ -0,0 +1,196 @@
+/*
+ * Copyright © 2020 Michael Gratton <mike vee net>.
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later). See the COPYING file in this distribution.
+ */
+
+[ModuleInit]
+public void peas_register_types(TypeModule module) {
+    Peas.ObjectModule obj = module as Peas.ObjectModule;
+    obj.register_extension_type(
+        typeof(Plugin.PluginBase),
+        typeof(Plugin.MailMerge)
+    );
+}
+
+/**
+ * Plugin to Fill in and send email templates using a spreadsheet.
+ */
+public class Plugin.MailMerge :
+    PluginBase, FolderExtension, EmailExtension {
+
+
+    // Translators: Templates folder name alternatives. Separate names
+    // using a vertical bar and put the most common localized name to
+    // the front for the default. English names do not need to be
+    // included.
+    private const string LOC_NAMES = _(
+        "Templates | Template Mail | Template Email | Template E-Mail"
+    );
+    // This must be identical to he above except without translation
+    private const string UNLOC_NAMES = (
+        "Templates | Template Mail | Template Email | Template E-Mail"
+    );
+
+
+    private const string ACTION_EDIT = "edit-template";
+    private const string ACTION_MERGE = "merge-template";
+
+    private const int INFO_BAR_PRIORITY = 10;
+
+
+    public FolderContext folders {
+        get; set construct;
+    }
+
+    public EmailContext email {
+        get; set construct;
+    }
+
+
+    private FolderStore? folder_store = null;
+    private EmailStore? email_store = null;
+
+    private GLib.SimpleAction? edit_action = null;
+    private GLib.SimpleAction? merge_action = null;
+
+    private Gee.List<string> folder_names = new Gee.ArrayList<string>();
+
+    private GLib.Cancellable cancellable = new GLib.Cancellable();
+
+
+    public override async void activate() throws GLib.Error {
+        // Add localised first, so if we need to create a folder it
+        // will be created localised.
+        Geary.iterate_array(LOC_NAMES.split("|")).map<string>(
+            (name) => name.strip()
+        ).add_all_to(this.folder_names);
+        Geary.iterate_array(UNLOC_NAMES.split("|")).map<string>(
+            (name) => name.strip()
+        ).add_all_to(this.folder_names);
+
+        this.folder_store = yield this.folders.get_folder_store();
+
+        this.email_store = yield this.email.get_email_store();
+        this.email_store.email_displayed.connect(on_email_displayed);
+
+        this.edit_action = new GLib.SimpleAction(
+            ACTION_EDIT, this.email_store.email_identifier_variant_type
+        );
+        this.edit_action.activate.connect(on_edit_activated);
+        this.plugin_application.register_action(this.edit_action);
+
+        this.merge_action = new GLib.SimpleAction(
+            ACTION_MERGE, this.email_store.email_identifier_variant_type
+        );
+        this.merge_action.activate.connect(on_merge_activated);
+        this.plugin_application.register_action(this.merge_action);
+    }
+
+    public override async void deactivate(bool is_shutdown) throws GLib.Error {
+        this.cancellable.cancel();
+
+        this.plugin_application.deregister_action(this.edit_action);
+        this.edit_action = null;
+
+        this.plugin_application.deregister_action(this.merge_action);
+        this.merge_action = null;
+
+        this.folder_store = null;
+
+        this.email_store.email_displayed.disconnect(on_email_displayed);
+        this.email_store = null;
+
+        this.folder_names.clear();
+    }
+
+    private async void edit_email(EmailIdentifier id) {
+        try {
+            var composer = this.plugin_application.new_composer(id.account);
+            var containing = yield this.folder_store.list_containing_folders(
+                id, this.cancellable
+            );
+            var folder = containing.first_match(
+                (f) => f.display_name in this.folder_names
+            );
+
+            composer.save_to_folder(folder);
+            composer.can_send = false;
+            yield composer.edit_email(id);
+            composer.show();
+        } catch (GLib.Error err) {
+            warning("Unable to construct composer: %s", err.message);
+        }
+    }
+
+    private async void merge_email(EmailIdentifier id) {
+
+    }
+
+    private async void update_email(Email target) {
+        var containing = Gee.Collection.empty<Folder>();
+        try {
+            containing = yield this.folder_store.list_containing_folders(
+                target.identifier, this.cancellable
+            );
+        } catch (GLib.Error err) {
+            warning("Could not load folders for email: %s", err.message);
+        }
+        if (containing.any_match((f) => f.display_name in this.folder_names)) {
+            this.email.add_email_info_bar(
+                target.identifier,
+                new_template_email_info_bar(target.identifier),
+                INFO_BAR_PRIORITY
+            );
+        }
+    }
+
+    private InfoBar new_template_email_info_bar(EmailIdentifier target) {
+        // Translators: Infobar status label for an email mail merge
+        // template
+        var bar = new InfoBar(_("Mail merge template"));
+        bar.primary_button = new Button(
+            // Translators: Info bar button label for performing a
+            // mail-merge on an email template
+            _("Merge"),
+            this.merge_action,
+            target.to_variant()
+        );
+        bar.secondary_buttons.add(
+            new Button(
+                // Translators: Info bar button label for editing an
+                // existing email template
+                _("Edit"),
+                this.edit_action,
+                target.to_variant()
+            )
+        );
+        return bar;
+    }
+
+    private void on_edit_activated(GLib.Action action, GLib.Variant? target) {
+        if (this.email_store != null && target != null) {
+            EmailIdentifier? id =
+                this.email_store.get_email_identifier_from_variant(target);
+            if (id != null) {
+                this.edit_email.begin(id);
+            }
+        }
+    }
+
+    private void on_merge_activated(GLib.Action action, GLib.Variant? target) {
+        if (this.email_store != null && target != null) {
+            EmailIdentifier? id =
+                this.email_store.get_email_identifier_from_variant(target);
+            if (id != null) {
+                this.merge_email.begin(id);
+            }
+        }
+    }
+
+    private void on_email_displayed(Email email) {
+        this.update_email.begin(email);
+    }
+
+}
diff --git a/src/client/plugin/mail-merge/meson.build b/src/client/plugin/mail-merge/meson.build
new file mode 100644
index 00000000..21898912
--- /dev/null
+++ b/src/client/plugin/mail-merge/meson.build
@@ -0,0 +1,27 @@
+
+plugin_name = 'mail-merge'
+
+plugin_src = files(plugin_name + '.vala')
+plugin_data = plugin_name + plugin_data_suffix
+plugin_dest = plugins_dir / plugin_name
+
+shared_module(
+  plugin_name,
+  sources: plugin_src,
+  dependencies: plugin_dependencies,
+  include_directories: config_h_dir,
+  vala_args: geary_vala_args,
+  c_args: plugin_c_args,
+  install: true,
+  install_dir: plugin_dest
+)
+
+i18n.merge_file(
+  input: files(plugin_data + plugin_data_src_suffix),
+  output: plugin_data,
+  type: 'desktop',
+  po_dir: po_dir,
+  install: true,
+  install_dir: plugin_dest,
+  install_rpath: client_lib_dir,
+)
diff --git a/src/client/plugin/meson.build b/src/client/plugin/meson.build
index 6197a5f0..4fd77405 100644
--- a/src/client/plugin/meson.build
+++ b/src/client/plugin/meson.build
@@ -30,6 +30,7 @@ plugin_data_suffix = '.plugin'
 subdir('desktop-notifications')
 subdir('email-templates')
 subdir('folder-highlight')
+subdir('mail-merge')
 subdir('messaging-menu')
 subdir('notification-badge')
 subdir('sent-sound')