Idempotently launches each Procfile service as a tmux pane in a background window. Cursed dense bash hacks 🐉

goreman-tmux

#!/bin/bash
set -e -o pipefail -u

# Launches each Procfile service as a tmux pane in a background window.
# The window is created if it doesn't already exist.
# Panes are created on demand, and existing panes are restarted if stopped.

WINDOW_NAME="goreman"

tmux new-window -adS -n $WINDOW_NAME
tmux set -w -t $WINDOW_NAME monitor-activity off
tmux set -w -t $WINDOW_NAME pane-border-format " #{pane_index}: #{pane_title} "
tmux set -w -t $WINDOW_NAME pane-border-status top

wait=""
for p in $(goreman check | ruby -ne 'puts $&.split(/,\s*/) if /(?<=\().*(?=\))/'); do
  status=$(tmux list-panes -t $WINDOW_NAME -f "#{==:#{pane_title},$p}" -F "#D #{?#{==:#{pane_current_command},$WINDOW_NAME},alive,dead}")
  if [[ -z $status ]]; then
    echo "$p starting"
    pane=$(tmux split-window -bd -t $WINDOW_NAME -l 4 -PF '#D')
    tmux select-pane -t "$pane" -T "$p"
    sleep 0.1 # give shell a moment to start, for cleaner output
    tmux send-keys -t "$pane" "goreman start $p" "C-m"
    wait="1"
  elif [[ $status =~ dead ]]; then
    echo "$p restarting"
    tmux send-keys -t "${status%% *}" "goreman start $p" "C-m"
    wait="1"
  fi
done
tmux select-layout -t $WINDOW_NAME tiled

# Wait a moment for (re)started processes before listing panes.
if [[ $wait == "1" ]]; then sleep 1; fi

tmux list-windows -f "#{==:#{window_name},$WINDOW_NAME}" \
  -F 'tmux window #{window_index}: #{window_name} (#{window_panes} panes)'
tmux list-panes -t $WINDOW_NAME \
  -F "  #{?#{==:#{pane_current_command},$WINDOW_NAME},✔,#{?#{!=:#{pane_title},#H},✘, }} #P: #{?#{==:#{pane_title},#H},#{pane_current_command},#{pane_title}}"

$ bin/goreman-tmux
tmux window 4: goreman (10 panes)
  ✔ 0: frontend
  ✔ 1: nginx
  ✔ 2: puma
  ✔ 3: relay
  ✔ 4: s3
  ✔ 5: sidekiq
  ✔ 6: site
  ✔ 7: smokescreen
  ✔ 8: webpacker
    9: zsh