Scripting and Layouts

#!/usr/bin/env bash
set -euo pipefail
S=api
cd ~/projects/api

tmux has-session -t "$S" 2>/dev/null && exec tmux attach -t "$S"

# Window 1: editor
tmux new-session  -d -s "$S" -n editor -c ~/projects/api
tmux send-keys    -t "$S:editor" 'nvim .' Enter

# Window 2: server on top, logs below
tmux new-window   -t "$S" -n server -c ~/projects/api
tmux send-keys    -t "$S:server" 'npm run dev' Enter
tmux split-window -t "$S:server" -v -p 30 -c ~/projects/api
tmux send-keys    -t "$S:server" 'npm run test:watch' Enter

# Window 3: a plain shell and a git pane
tmux new-window   -t "$S" -n shell -c ~/projects/api
tmux split-window -t "$S:shell" -h -c ~/projects/api
tmux send-keys    -t "$S:shell.2" 'git status' Enter

tmux select-window -t "$S:editor"
tmux attach -t "$S"

tmux display-message -p '#{pane_id}'      # capture the id you just created
PANE=$(tmux split-window -P -F '#{pane_id}')
tmux send-keys -t "$PANE" 'htop' Enter

tmux ls
tmux list-sessions -F '#{session_name}: #{session_windows} windows'
tmux list-windows -a -F '#{session_name}:#{window_index} #{window_name}'
tmux list-panes -a -F '#{session_name}:#{window_index}.#{pane_index} #{pane_current_command}'
tmux display-message -p '#{pane_current_path}'
tmux info                              # server diagnostics
tmux show-environment
tmux show-environment -g

# Fuzzy switch sessions
tmux ls -F '#{session_name}' | fzf | xargs -r tmux switch-client -t

set -g update-environment "DISPLAY SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"

tmux set-environment -g EDITOR nvim
tmux set-environment FOO bar          # session scope
tmux show-environment -g
tmux setenv -r SSH_AUTH_SOCK          # remove it, so the pane inherits fresh

# Toggle the outer tmux off so every key goes to the inner one
bind -T root F12 \
  set prefix None \;\
  set key-table off \;\
  set status-style "fg=colour245,bg=colour238" \;\
  refresh-client -S

bind -T off F12 \
  set -u prefix \;\
  set -u key-table \;\
  set -u status-style \;\
  refresh-client -S

ssh host -t tmux new -A -s main       # attach or create, in one flag (2.9+)
ssh host -t tmux attach || ssh host -t tmux new -s main
ssh host -t 'tmux attach -d -t main'  # steal the session from a stale client

# ~/.config/tmuxinator/api.yml
name: api
root: ~/projects/api
windows:
  - editor: nvim .
  - server:
      layout: main-horizontal
      panes:
        - npm run dev
        - npm run test:watch
  - shell:
      panes:
        - git status
        -

tmuxinator start api
tmuxp load api
tmuxp freeze api > ~/.tmuxp/api.yaml    # capture a session you built by hand

#!/usr/bin/env bash
# ~/bin/tmux-sessionizer
dir=$(find ~/projects ~/work -mindepth 1 -maxdepth 1 -type d | fzf) || exit 0
name=$(basename "$dir" | tr . _)

if ! tmux has-session -t "=$name" 2>/dev/null; then
  tmux new-session -ds "$name" -c "$dir"
fi

if [ -n "$TMUX" ]; then
  tmux switch-client -t "$name"
else
  tmux attach -t "$name"
fi

bind f run-shell "tmux neww ~/bin/tmux-sessionizer"

set-hook -g session-created 'display "session #S created"'
set-hook -g after-new-window 'select-layout tiled'
set-hook -g pane-exited 'select-layout tiled'
set-hook -g client-attached 'refresh-client -S'
set-hook -g window-linked 'renumber-windows'

tmux show-hooks -g
tmux set-hook -gu session-created     # unset it