[polybar] Add pomo timer as git submodule

Using [jsspencer/pomo](https://github.com/jsspencer/pomo) as the timer
of choice. It is simple, it works well, and it uses a very elegant way
of tracking the time.

I can think about implementing my own version later, but this will
handily suffice for now.

Polybar script will now limit the pomo timer to a single 'running'
instance containing the notification function, by putting its running
instance PID in a lockfile and killing it before restarting or changing
the timer.

Added running and paused tomato icons; as well as break coffee icon.
Removed display of seconds, unless the last minute of a timer is
running.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "polybar/.local/share/pomo"]
+	path = polybar/.local/share/pomo
+	url = https://github.com/jsspencer/pomo.git

polybar/.config/polybar/config

@@ -57,7 +57,7 @@ padding-left = 0
 padding-right = 0
 module-margin-left = 2
 
-modules-left = workspaces
+modules-left = workspaces pomo
 modules-center = music date papersdue
 modules-right = networkspeed archupdates cpu temp backlight volume battery
 ; do not use offsets for the bar, would only work with override-redirect
@@ -212,6 +212,7 @@ time-alt = %H:%M
 label = %date% %{T2} %{T-}%time%
 
 ; display information on currently playing track, allows simple track manipulation
+; TODO: add album art display (on click?) - retrieved by playerctl metadata mpris:artUrl
 [module/music]
 type = custom/script
 exec = $XDG_CONFIG_HOME/polybar/scripts/poly-mprisdisplay
@@ -219,7 +220,6 @@ exec-if = type $XDG_CONFIG_HOME/polybar/scripts/poly-mprisdisplay
 tail = true
 click-left = kill -USR1 %pid%
 click-right = kill -USR2 %pid%
-; TODO: add album art display (on click?) - retrieved by playerctl metadata mpris:artUrl
 
 ; display information on remaining papers to read for the upcoming week
 [module/papersdue]
@@ -227,11 +227,25 @@ type = custom/script
 exec = $XDG_CONFIG_HOME/polybar/scripts/poly-papersdue
 exec-if = type bib-due
 tail = true
+; show list with high prio
 click-left = exist rofi-bib-due normal "opening due papers" && rofi-bib-due -p1 -u $(date --date='fri this week' +%Y-%m-%d)
+; show list with all
+click-right = exist rofi-bib-due normal "opening due papers" && rofi-bib-due -p3 -u $(date --date='fri this week' +%Y-%m-%d)
 ; format-foreground = ${colors.primary}
 format-prefix = " "
 interval = 120
 
+; displays a small pomodoro timer
+[module/pomo]
+type = custom/script
+exec = $XDG_CONFIG_HOME/polybar/scripts/poly-pomo
+exec-if = exist pomo normal "pomodoro timer"
+; pause timer
+click-left = $XDG_CONFIG_HOME/polybar/scripts/poly-pomo toggle
+; restart timer
+click-right = $XDG_CONFIG_HOME/polybar/scripts/poly-pomo restart
+tail = true
+
 ; display unified available packages for update on arch from repos/aur
 ; uses pacman-contrib/checkupdates if available to avoid partial arch upgrades
 [module/archupdates]

polybar/.config/polybar/scripts/poly-papersdue

@@ -1,7 +1,7 @@
 #!/usr/bin/env sh
 
 while true; do
-  all="$(bib-due -u 'fri this week' | wc -l)"
+  all="$(bib-due -u 'fri this week' -p3 | wc -l)"
   required="$(bib-due -u 'fri this week' -p1 | wc -l)"
 
   # add polybar formatting to color required readings red

polybar/.config/polybar/scripts/poly-pomo

@@ -0,0 +1,41 @@
+#!/usr/bin/env sh
+
+run_notify() {
+  pomo notify &
+  PID_NOTIFY="$!"
+  echo "$PID_NOTIFY" >"${XDG_RUNTIME_DIR:-$HOME}"/.running-pomo.lock
+}
+
+# create background notify process; close it when this process  is killed
+close_notify() {
+  lockfile="${XDG_RUNTIME_DIR:-$HOME}"/.running-pomo.lock
+  [ -f "$lockfile" ] && kill "$(cat "$lockfile")"
+  kill "$PID_NOTIFY"
+  rm "${XDG_RUNTIME_DIR:-$HOME}"/.running-pomo.lock
+}
+trap close_notify EXIT
+
+restart_notify() {
+  close_notify
+  run_notify
+}
+
+if [ -z "$1" ]; then
+  run_notify
+  while true; do
+    display=$(pomo clock)
+    # replace W (work)
+    #         B (break)
+    #         P (paused) with pomodoro symbols
+    # remove seconds *except for* when 00 minutes reached
+    display=$(echo "$display" | sed -e 's/P.*$/  /;s/W/ /;s/B/ /;/00:/! { s/:[[:digit:]]\+$// }')
+    echo "$display"
+    sleep 1
+  done
+elif [ "$1" = "toggle" ]; then
+  pomo pause
+  restart_notify
+elif [ "$1" = "restart" ]; then
+  pomo stop && pomo start
+  restart_notify
+fi

polybar/.local/bin/pomo

@@ -0,0 +1 @@
+../share/pomo/pomo.sh

polybar/.local/share/pomo

@@ -0,0 +1 @@
+Subproject commit 68a8e26a46f8516ee73b429c153a1fc7a4a2c300