feat: add background mail polling option for all workers

Check for new mail (recent, unseen, exists counts) with an external
command, or for imap with the STATUS command, at start or on
reconnection and every X time duration

IMAP:
The selected folder is skipped, per specification. Additional config
options are included for including/excluding folders explicitly.

Maildir/Notmuch:
An external command will be run in the background to check for new mail.
An optional timeout can be used with maildir/notmuch. Default is 10s

New account options:
check-mail
check-mail-cmd (maildir/notmuch only)
check-mail-timeout (maildir/notmuch only), default 10s
check-mail-include (IMAP only)
check-mail-exclude (IMAP only)

If unset, or set less than or equal to 0, check-mail will be ignored

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Tested-by: Moritz Poldrack <moritz@poldrack.dev>
Acked-by: Robin Jarry <robin@jarry.cc>

4 files changed, 59 insertions, 0 deletions

diff --git a/doc/aerc-config.5.scd b/doc/aerc-config.5.scd
index 79025508..b7fba82d 100644
--- a/doc/aerc-config.5.scd
+++ b/doc/aerc-config.5.scd
@@ -525,6 +525,20 @@ Note that many of these configuration options are written for you, such as
 
 	Default: Archive
 
+*check-mail*
+	Specifies an interval to check for new mail. Mail will be checked at
+	startup, and every interval. IMAP accounts will check for mail in all
+	unselected folders, and the selected folder will continue to receive PUSH
+	mail notifications. Maildir/Notmuch folders must use *check-mail-cmd* in
+	conjunction with this option. See *aerc-maildir* and *aerc-notmuch* for
+	more information.
+
+	Setting this option to 0 will disable check-mail
+
+	Example: 5m
+
+	Default: 0
+
 *copy-to*
 	Specifies a folder to copy sent mails to, usually "Sent".
 
diff --git a/doc/aerc-imap.5.scd b/doc/aerc-imap.5.scd
index 5a20749a..99640b64 100644
--- a/doc/aerc-imap.5.scd
+++ b/doc/aerc-imap.5.scd
@@ -96,6 +96,21 @@ available:
 	This option is only supported on linux. On other platforms, it will be
 	ignored.
 
+*check-mail-include*
+	Specifies the comma separated list of folders to include when checking for
+	new mail with *check-mail*. Names prefixed with ~ are interpreted as regular
+	expressions.
+
+	Default: all folders
+
+*check-mail-exclude*
+	Specifies the comma separated list of folders to exclude when checking for
+	new mail with *check-mail*. Names prefixed with ~ are interpreted as regular
+	expressions.
+	Note that this overrides anything from *check-mail-include*.
+
+	Default: no folders
+
 # SEE ALSO
 
 *aerc*(1) *aerc-config*(5)
diff --git a/doc/aerc-maildir.5.scd b/doc/aerc-maildir.5.scd
index 7f6e7ccd..80bc0931 100644
--- a/doc/aerc-maildir.5.scd
+++ b/doc/aerc-maildir.5.scd
@@ -15,6 +15,21 @@ must be added manually to the *aerc-config*(5) file.
 
 The following maildir-specific options are available:
 
+*check-mail-cmd*
+	Command to run in conjunction with *check-mail* option.
+
+	Example:
+		mbsync -a
+
+	Default: none
+
+*check-mail-timeout*
+	Timeout for the *check-mail-cmd*. The command will be stopped if it does
+	not complete in this interval and an error will be displayed. Increase from
+	the default if repeated errors occur
+
+	Default: 10s
+
 *source*
 	maildir://path
 
diff --git a/doc/aerc-notmuch.5.scd b/doc/aerc-notmuch.5.scd
index a411c51f..44b6b9d2 100644
--- a/doc/aerc-notmuch.5.scd
+++ b/doc/aerc-notmuch.5.scd
@@ -20,6 +20,21 @@ must be added manually.
 In accounts.conf (see *aerc-config*(5)), the following notmuch-specific
 options are available:
 
+*check-mail-cmd*
+	Command to run in conjunction with *check-mail* option.
+
+	Example:
+		mbsync -a
+
+	Default: none
+
+*check-mail-timeout*
+	Timeout for the *check-mail-cmd*. The command will be stopped if it does
+	not complete in this interval and an error will be displayed. Increase from
+	the default if repeated errors occur
+
+	Default: 10s
+
 *source*
 	notmuch://path