rmux : Run rmux inside a rails project to start tmux sessions with panes for terminal, editor, rails server and console

rmux.sh

rmux () {
	# Ask to exit if inside a tmux session
	if [[ -n "$TMUX" ]] { echo >&2 "Exit this tmux session to avoid nesting sessions"; return 1; } fi

	git_root="$(git rev-parse --show-toplevel || echo .)"

	# If not a git repo assume this isn't a rails project and exit
	if [[ $git_root == "." ]] { echo "\nNot a Git repo. Are you sure this is a rails project?"; return 1; } fi

	# If not a rails project exit with a message
	# Get to git root and look for rails string in Gemfile
	grep "rails" "$git_root/Gemfile" >/dev/null 2>&1
	if [ $? -ne 0 ]; then
	  echo "\nIt's not a Rails project!"; return 1;
	else
		cd $git_root
		goback=1
	fi

	railsappclass=$(rails runner "puts Rails.application.class.module_parent.name")

	tmux has-session -t "$railsappclass" 2>/dev/null

	# If session with app class doesn't exist. Setup the session
	if [ $? != 0 ]; then
		# Use -d to allow the rest of the function to run
		# Window 1 terminal
		tmux new-session -d -s $railsappclass -n terminal

		# Window 2 editor
		tmux new-window -d -n editor nvim

		# Window 3 rails server and watchers
		# To avoid port conflicts set unique port numbers for each project
		# Add a project specific port number in bin/dev or Procfile
		# Use git assume-unchanged if you want to avoid tracking this change
		# Or add it to git exclude if the project doesn't have a bin/dev
		if [ -f bin/dev ]
		then
			tmux new-window -d -n server bin/dev
		elif [ -f Procfile ]
		then
			tmux new-window -d -n server bundle exec foreman start
		else
			tmux new-window -d -n server bundle exec rails s
		fi

		# WIndow 4 rails console
		tmux new-window -d -n console bundle exec rails console

		if [[ $goback -eq 1 ]] { cd - > /dev/null } fi

		# -d to detach any other client (which there shouldn't be,
		# since you just created the session).

		# use the below line if you want to attach to the session
		# on running the command
		tmux attach-session -d -t $railsappclass
	else
		if [[ $goback -eq 1 ]] { cd - > /dev/null } fi
		# If session already exists simply attach to it
		tmux attach-session -d -t $railsappclass
	fi

}