Implement the individual windows sharing feature

Original MR: https://gitlab.com/tile-os/tileos-settings-sway/-/merge_requests/21

etc/skel/.config/dunst/dunstrc

@@ -17,7 +17,7 @@
     #
     # If this option is set to mouse or keyboard, the monitor option
     # will be ignored.
-    follow = none
+    follow = mouse
 
     ### Geometry ###
 

etc/sway/modes/default.conf

@@ -97,7 +97,6 @@ $bindsym $mod+6 workspace $ws6
 $bindsym $mod+7 workspace $ws7
 $bindsym $mod+8 workspace $ws8
 $bindsym $mod+9 workspace $ws9
-$bindsym $mod+0 workspace $ws10
 
 set $focus_ws [ "$focus_after_move" == 'true' ] && swaymsg workspace
 

etc/sway/modes/screenmirror.conf

@@ -0,0 +1,18 @@
+#
+# Screenmirror:
+#
+# The mode allows the user to mirror the headless output.
+# This is primarily used when screencasting to cast only the windows that
+# belong to the headless output instead of casting the entire screen.
+#
+# See the following link for more details:
+# https://github.com/emersion/xdg-desktop-portal-wlr/issues/107#issuecomment-1596107337
+
+set $screenmirror /usr/share/sway/scripts/screenmirror.sh
+set $start_mirror systemd-cat $screenmirror $headless
+set $stop_mirror systemd-cat $screenmirror -k
+
+## Launch // Switch to the workspace for mirroring ##
+$bindsym $mod+0 exec $start_mirror, workspace $ws10
+## Launch // Switch back from the workspace for mirroring ##
+$bindsym $mod+Mod1+0 exec $stop_mirror, workspace back_and_forth

etc/sway/outputs/headless-output.conf

@@ -0,0 +1,9 @@
+# This output configuration is required for the screenmirror mode to work.
+
+set $headless HEADLESS-1
+
+output $headless {
+    position 16000 16000
+}
+workspace $ws10 output $headless
+exec swaymsg create_output

etc/sway/variables

@@ -72,7 +72,7 @@ set $ws6 number 6
 set $ws7 number 7
 set $ws8 number 8
 set $ws9 number 9
-set $ws10 number 10
+set $ws10 "<span baseline_shift='-20pt' weight='bold'>🖵</span>"
 
 # Screenshot
 set $grimshot /usr/bin/grimshot

etc/xdg/xdg-desktop-portal-wlr/config

@@ -0,0 +1,3 @@
+[screencast]
+chooser_type=dmenu
+chooser_cmd=/usr/share/sway/scripts/select-output.sh

usr/share/sway/scripts/recorder.sh

@@ -52,12 +52,14 @@ main() {
     wf-recorder --audio -g "$area" --file="$file"
   else
     file="$target_path/$timestamp.webm"
+    output="$(swaymsg -t get_outputs | jq -r '.[] | select(.focused) | .name')"
     wf-recorder \
       -g "$area" -c libvpx \
       --codec-param="qmin=0" \
       --codec-param="qmax=25" \
       --codec-param="crf=4" \
       --codec-param="b:v=1M" \
+      -o "$output" \
       --file="$file"
   fi
 

usr/share/sway/scripts/screenmirror.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+#
+# This script implements the function of mirroring outputs.
+# It uses wl-mirror and Sway's ability to create headless outputs.
+#
+# The script is written as a singleton. It allows the user to run only one
+# instance of itself and kills all others. This is necessary so that wl-mirror
+# instances do not interfere with each other.
+
+SELF_NAME="$(basename "$0")"
+SELF_PID="$$"
+
+get_pgid() {
+  ps -h -o "%r" -p "$1" | awk '{print $1}'
+}
+SELF_PGID="$(get_pgid "$SELF_PID")"
+
+kill_by_pgid() {
+  pkill -"$2" -g "$1"
+}
+
+kill_copies() {
+  mapfile -t pids < <(pgrep -u "$USER" -x "$SELF_NAME")
+  for pid in "${pids[@]}" ; do
+    pgid="$(get_pgid "$pid")"
+    [[ $pgid -ne $SELF_PGID ]] && kill_by_pgid "$pgid" "INT"
+  done
+}
+
+main() {
+  # Don't single quote the trap's command!
+  # It must be expanded when the trap is defined.
+  # shellcheck disable=SC2064
+  trap "kill_by_pgid $SELF_PGID TERM" INT
+  kill_copies
+  [[ "$1" != "-k" ]] && wl-mirror -F "${1:-HEADLESS-1}"
+}
+main "$@"

usr/share/sway/scripts/select-output.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+export LC_ALL=C
+
+TITLE="Select the output for the screencast"
+OUT_NAME="HEADLESS-1"
+FONT_SIZE="12"
+ROSEWATER="#f4dbd6"
+
+FONT="Noto Sans ${FONT_SIZE}"
+FONT_COLOR="${ROSEWATER}"
+
+I_SIZE="$(awk "BEGIN {print (${FONT_SIZE}*1.08)}")"
+OUT_SIZE="$(awk "BEGIN {print (${FONT_SIZE}*0.94)}")"
+TIP_SHIFT="$(awk "BEGIN {print (1+(${I_SIZE}-${FONT_SIZE})/2)}")"
+TIP="\
+<span color='${FONT_COLOR}'>\
+<span size='${I_SIZE}pt'></span> \
+<span baseline_shift='${TIP_SHIFT}pt'>use \
+<span size='${OUT_SIZE}pt'>${OUT_NAME}</span> \
+to cast only chosen windows\
+</span>\
+</span>\
+"
+
+swaymsg -t get_outputs \
+  | jq -r '.[] | .name' \
+  | rofi \
+    -dmenu -i -l 4 \
+    -p "${TITLE}" \
+    -window-title "${TITLE}" \
+    -mesg "${TIP}" \
+    -font "${FONT}"