emacs: add termux-service script, put socket in $PREFIX/var/run

Start with sv up emacsd

packages/emacs/build.sh

@@ -2,12 +2,13 @@ TERMUX_PKG_HOMEPAGE=https://www.gnu.org/software/emacs/
 TERMUX_PKG_DESCRIPTION="Extensible, customizable text editor-and more"
 TERMUX_PKG_LICENSE="GPL-3.0"
 TERMUX_PKG_VERSION=26.2
-TERMUX_PKG_REVISION=3
+TERMUX_PKG_REVISION=4
 TERMUX_PKG_SRCURL=https://mirrors.kernel.org/gnu/emacs/emacs-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_SHA256=151ce69dbe5b809d4492ffae4a4b153b2778459de6deb26f35691e1281a9c58e
 TERMUX_PKG_DEPENDS="ncurses, gnutls, libxml2"
 TERMUX_PKG_BREAKS="emacs-dev"
 TERMUX_PKG_REPLACES="emacs-dev"
+TERMUX_PKG_CONFFILES="var/service/emacsd/run var/service/emacsd/log/run"
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 --disable-autodepend
 --with-gif=no
@@ -83,6 +84,17 @@ termux_step_post_configure() {
 
 termux_step_post_make_install() {
 	cp $TERMUX_PKG_BUILDER_DIR/site-init.el $TERMUX_PREFIX/share/emacs/${TERMUX_PKG_VERSION}/lisp/emacs-lisp/
+
+	# Setup emacs --daemon service script
+	mkdir -p $TERMUX_PREFIX/var/service
+	cd $TERMUX_PREFIX/var/service
+	mkdir -p emacsd/log
+	echo "#!$TERMUX_PREFIX/bin/sh" > emacsd/run
+	echo 'exec emacs --fg-daemon 2>&1' >> emacsd/run
+	chmod +x emacsd/run
+	touch emacsd/down
+
+	ln -sf $TERMUX_PREFIX/share/termux-services/svlogger emacsd/log/run
 }
 
 termux_step_create_debscripts() {

packages/emacs/lisp-server.el.patch.beforehostbuild

@@ -6,7 +6,7 @@ diff -u -r ../emacs-25.0.92/lisp/server.el ./lisp/server.el
  (defvar server-socket-dir
    (and (featurep 'make-network-process '(:family local))
 -       (format "%s/emacs%d" (or (getenv "TMPDIR") "/tmp") (user-uid)))
-+       (format "%s/emacs%d" (or (getenv "TMPDIR") "@TERMUX_PREFIX@/tmp") (user-uid)))
++       (format "%s/emacs%d" "@TERMUX_PREFIX@/var/run" (user-uid)))
    "The directory in which to place the server socket.
  If local sockets are not supported, this is nil.")