Add OnlyFetchMvbox option

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## Unreleased
+
+### API changes
+- added `only_fetch_mvbox` config #3014
+
 ## 1.72.0
 
 ### Fixes

deltachat-ffi/deltachat.h

@@ -343,6 +343,11 @@ char*           dc_get_blobdir               (const dc_context_t* context);
  *                    and watch the `DeltaChat` folder for updates (default),
  *                    0=do not move chat-messages
  *                    changes require restarting IO by calling dc_stop_io() and then dc_start_io().
+ * - `only_fetch_mvbox` = 1=ignore all folders except for the `DeltaChat` folder.
+ *                    Setting this will automatically set `mvbox_move` to 1 and `sentbox_watch` to 0.
+ *                    Setting `mvbox_move` to 0 or `sentbox_watch` to 1 will automatically disable this option.
+ *                    When this option is set, the UI should disable the `mvbox_move` and `sentbox_watch` options.
+ *                    0=watch all folders normally (default)
  * - `show_emails`  = DC_SHOW_EMAILS_OFF (0)=
  *                    show direct replies to chats only (default),
  *                    DC_SHOW_EMAILS_ACCEPTED_CONTACTS (1)=

src/config.rs

@@ -74,6 +74,9 @@ pub enum Config {
     #[strum(props(default = "0"))]
     SentboxMove, // If `MvboxMove` is true, this config is ignored. Currently only used in tests.
 
+    #[strum(props(default = "0"))]
+    OnlyFetchMvbox,
+
     #[strum(props(default = "0"))] // also change ShowEmails.default() on changes
     ShowEmails,
 
@@ -295,6 +298,33 @@ impl Context {
                 let value = value.map(improve_single_line_input);
                 self.sql.set_raw_config(key, value.as_deref()).await?;
             }
+            Config::SentboxWatch => {
+                self.sql.set_raw_config(key, value).await?;
+                if config_to_bool(value) {
+                    self.sql
+                        .set_raw_config(Config::OnlyFetchMvbox, Some("0"))
+                        .await?;
+                }
+            }
+            Config::MvboxMove => {
+                self.sql.set_raw_config(key, value).await?;
+                if !config_to_bool(value) {
+                    self.sql
+                        .set_raw_config(Config::OnlyFetchMvbox, Some("0"))
+                        .await?;
+                }
+            }
+            Config::OnlyFetchMvbox => {
+                self.sql.set_raw_config(key, value).await?;
+                if config_to_bool(value) {
+                    self.sql
+                        .set_raw_config(Config::SentboxWatch, Some("0"))
+                        .await?;
+                    self.sql
+                        .set_raw_config(Config::MvboxMove, Some("1"))
+                        .await?;
+                }
+            }
             _ => {
                 self.sql.set_raw_config(key, value).await?;
             }
@@ -335,6 +365,13 @@ fn get_config_keys_string() -> String {
     format!(" {} ", keys)
 }
 
+fn config_to_bool(value: Option<&str>) -> bool {
+    value
+        .and_then(|s| s.parse::<i32>().ok())
+        .unwrap_or_default()
+        != 0
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/context.rs

@@ -358,6 +358,7 @@ impl Context {
         let sentbox_watch = self.get_config_int(Config::SentboxWatch).await?;
         let mvbox_move = self.get_config_int(Config::MvboxMove).await?;
         let sentbox_move = self.get_config_int(Config::SentboxMove).await?;
+        let only_fetch_mvbox = self.get_config_int(Config::OnlyFetchMvbox).await?;
         let folders_configured = self
             .sql
             .get_raw_config_int("folders_configured")
@@ -422,6 +423,7 @@ impl Context {
         res.insert("sentbox_watch", sentbox_watch.to_string());
         res.insert("mvbox_move", mvbox_move.to_string());
         res.insert("sentbox_move", sentbox_move.to_string());
+        res.insert("only_fetch_mvbox", only_fetch_mvbox.to_string());
         res.insert("folders_configured", folders_configured.to_string());
         res.insert("configured_sentbox_folder", configured_sentbox_folder);
         res.insert("configured_mvbox_folder", configured_mvbox_folder);

src/imap.rs

@@ -671,6 +671,11 @@ impl Imap {
         folder: &str,
         fetch_existing_msgs: bool,
     ) -> Result<bool> {
+        if should_ignore_folder(context, folder).await? {
+            info!(context, "Not fetching from {}", folder);
+            return Ok(false);
+        }
+
         let new_emails = self.select_with_uidvalidity(context, folder).await?;
 
         if !new_emails && !fetch_existing_msgs {
@@ -2076,6 +2081,14 @@ pub async fn get_config_last_seen_uid(context: &Context, folder: &str) -> Result
     }
 }
 
+async fn should_ignore_folder(context: &Context, folder: &str) -> Result<bool> {
+    Ok(context.get_config_bool(Config::OnlyFetchMvbox).await?
+            && context.is_mvbox(folder).await?
+            // Even if OnlyFetchMvbox is set, we have a look at the spam folder
+            // in case an answer to a known message was put into spam:
+            && context.is_spam_folder(folder).await?)
+}
+
 /// Builds a list of sequence/uid sets. The returned sets have each no more than around 1000
 /// characters because according to <https://tools.ietf.org/html/rfc2683#section-3.2.1.5>
 /// command lines should not be much more than 1000 chars (servers should allow at least 8000 chars)

src/imap/idle.rs

@@ -157,7 +157,6 @@ impl Imap {
                     // in anything.  If so, we behave as if IDLE had data but
                     // will have already fetched the messages so perform_*_fetch
                     // will not find any new.
-
                     match self.fetch_new_messages(context, &watch_folder, false).await {
                         Ok(res) => {
                             info!(context, "fetch_new_messages returned {:?}", res);