[PATCH v4 4/5] notmuch-emacs-mua: add --auto-daemon option to start Emacs daemon as needed

[Jani Nikula]

Automatically starting Emacs in daemon mode if the Emacs server is not
running is a matter of preference better not hard coded in
notmuch-emacs-mua. Add an option to control the behaviour.
---
 doc/man1/notmuch-emacs-mua.rst | 9 +++++++--
 notmuch-emacs-mua              | 8 ++++++--
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/doc/man1/notmuch-emacs-mua.rst b/doc/man1/notmuch-emacs-mua.rst
index 7c2f5c24f1c0..89a2fead17b1 100644
--- a/doc/man1/notmuch-emacs-mua.rst
+++ b/doc/man1/notmuch-emacs-mua.rst
@@ -37,8 +37,13 @@ Supported options for **notmuch-emacs-mua** include
         Even if a window system is available, use the current terminal.
 
     ``--client``
-        Use **emacsclient**, rather than **emacs**. This will start
-        an Emacs daemon process if necessary.
+        Use **emacsclient**, rather than **emacs**. For
+        **emacsclient** to work, you need an already running Emacs
+        with a server, or use ``--auto-daemon``.
+
+    ``--auto-daemon``
+        Automatically start Emacs in daemon mode, if the Emacs server
+        is not running. Applicable with ``--client``.
 
     ``--print``
         Output the resulting elisp to stdout instead of evaluating it.
diff --git a/notmuch-emacs-mua b/notmuch-emacs-mua
index 1f088c42feb9..ac03a4a60d56 100755
--- a/notmuch-emacs-mua
+++ b/notmuch-emacs-mua
@@ -36,6 +36,7 @@ EMACSCLIENT=${EMACSCLIENT-emacsclient}
 PRINT_ONLY=
 NO_WINDOW=
 USE_EMACSCLIENT=
+AUTO_DAEMON=
 CREATE_FRAME="-c"
 
 # The crux of it all: construct an elisp progn and eval it.
@@ -64,7 +65,7 @@ while getopts :s:c:b:i:h opt; do
 		    opt=${opt%%=*}
 		    ;;
 		# Long options without arguments.
-		--help|--print|--no-window-system|--client)
+		--help|--print|--no-window-system|--client|--auto-daemon)
 		    ;;
 		*)
 		    echo "$0: unknown long option ${opt}, or argument mismatch." >&2
@@ -107,6 +108,9 @@ while getopts :s:c:b:i:h opt; do
 	--client)
 	    USE_EMACSCLIENT="yes"
 	    ;;
+	--auto-daemon)
+	    AUTO_DAEMON="--alternate-editor="
+	    ;;
 	*)
 	    # We should never end up here.
 	    echo "$0: internal error (option ${opt})." >&2
@@ -134,7 +138,7 @@ fi
 
 if [ -n "$USE_EMACSCLIENT" ]; then
     # Evaluate the progn.
-    exec ${EMACSCLIENT} ${NO_WINDOW} ${CREATE_FRAME} -a '' --eval "${ELISP}"
+    exec ${EMACSCLIENT} ${NO_WINDOW} ${CREATE_FRAME} ${AUTO_DAEMON} --eval "${ELISP}"
 else
     exec ${EMACS} ${NO_WINDOW} --eval "${ELISP}"
 fi
-- 
2.1.4