combine s/d/emacsclient & update-emacs-daemon-environment

1 files changed, 94 insertions, 0 deletions

diff --git a/bin/emacsclient b/bin/emacsclient
new file mode 100755
index 00000000..91cef0aa
--- /dev/null
+++ b/bin/emacsclient
@@ -0,0 +1,94 @@
+#!/bin/sh
+
+# Copyright (C) 2022  Sean Whitton
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or (at
+# your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+
+# emacsclient(1) wrapper to handle updating the environment of existing
+# daemons and choosing between installed and in-tree builds of Emacs.
+
+for arg do
+    shift
+    case "$arg" in
+	'--spw/installed') mode=--spw/installed ;;
+	'--spw/update-environment') update=true ;;
+	*) set -- "$@" "$arg" ;;
+    esac
+done
+
+processes=$(ps -o exe -u "$LOGNAME" -U "$LOGNAME")
+echo "$processes" | grep -q "$HOME/src/emacs/src/emacs" && devel_running=true
+echo "$processes" | grep -q $(command -v emacs) && installed_running=true
+
+if [ "$devel_running" = true -a "$mode" = --spw/installed ]; then
+    pgrep --full "$HOME/src/emacs/src/emacs" | while read pid; do
+	kill $pid
+    done
+    socket="/run/user/$(id -u)/emacs/server"
+    [ -e $socket ] && inotifywait -qqt 2 -e delete $socket
+    devel_running=false
+fi
+
+# We check whether there is something which looks like the installed Emacs
+# running because we do not want the in-tree emacsclient to try to connect to
+# that, and we check whether there is a build in progress and no running
+# daemon, as we don't want to start a new daemon until the build is finished.
+# The idea is that I can always hit C-i e without worrying about builds.
+if [ "$mode" != --spw/installed -a "$installed_running" != true \
+	     -a -e "$HOME/src/emacs/admin/flagfile.melete" \
+	     -a -x "$HOME/src/emacs/lib-src/emacsclient" \
+	     -a -d "/usr/share/emacs-snapshot/site-lisp/elpa" ] \
+       && ! ( [ "$devel_running" != true ] && ps h -o pid -C make \
+		      | xargs pwdx | grep -q "$HOME/src/emacs" ); then
+    emacs="$HOME/src/emacs/src/emacs"
+    emacsclient="$HOME/src/emacs/lib-src/emacsclient"
+else
+    emacs=$(command -v emacs)
+    emacsclient=$(PATH=$(echo "$PATH" | sed -e "s#$HOME/src/dotfiles/bin:##") \
+		      command -v emacsclient)
+fi
+
+# Update Emacs daemon environment vars for a new interactive session.  This
+# allows us to have the Emacs daemon survive restarts of the graphical desktop
+# environment, and to update Emacs on a remote host when there is a new
+# forwarded SSH agent socket.  See 'upenv' in .bash_defns.
+if [ "$update" = true \
+	       -a \( "$devel_running" = true \
+	             -o "$installed_running" = true \) ]; then
+    for var in DISPLAY WAYLAND_DISPLAY \
+		       XAUTHORITY WINDOWID \
+		       XDG_SESSION_TYPE XDG_CURRENT_DESKTOP \
+		       SWAYSOCK I3SOCK \
+		       SSH_ASKPASS SSH_CONNECTION \
+		       SSH_AUTH_SOCK SSH_AGENT_PID; do
+	eval isset=\${$var+x}
+	if [ "$isset" = "x" ]; then
+	    eval val=\$$var
+	    args="$args"' (setenv "'$var'" "'$val'")'
+	fi
+    done
+    "$emacsclient" --eval "(progn$args (spw/propagate-new-environment))"
+fi
+
+# emacsclient(1) requires an argument.  As a special case, if there are no
+# arguments and no daemon is running, just start one.  And if there were no
+# arguments but we were requested just to update env vars, exit peacefully.
+if [ "$#" -eq 0 \
+	  -a "$devel_running" != true -a "$installed_running" != true ]; then
+    exec "$emacs" --daemon
+elif ! [ "$#" -eq 0 -a "$update" = true ]; then
+    exec "$emacsclient" -a "" "$@"
+fi