tmux-stare @ 02f8aba

#!/usr/bin/env bash

CURRENT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

source "$CURRENT_DIR/helpers.sh"

declare S=$'\t'

# === common

get_current_session_name() {

  if [ "$(tmux display-message -p "#{session_grouped}")" = 0 ]; then

    tmux display-message -p "#{session_name}" 2>/dev/null || true

  else

    tmux display-message -p "#{session_group}" 2>/dev/null || true

  fi

}

rename_session() {

  local old="$1"

  local new="$2"

  local dir="$(get_opt_dir)"

  [[ -z "$new" || "$old" == "$new" ]] && return 1

  [[ -e "${dir}/${new}_last" ]] && return 1

  tmux has-session -t "$new" 2>/dev/null && return 1

  tmux rename-session -t "$old" "$new" 2>/dev/null

  local old_last="${dir}/${old}_last"

  [[ -L "$old_last" ]] && {

    local actual="$(readlink "$old_last")"

    local new_actual="${dir}/${new}_$(basename "$actual" | cut -d_ -f2-)"

    mv "$actual" "$new_actual"

    ln -sf "$new_actual" "${dir}/${new}_last"

    rm "$old_last"

  }

}

# === save

save_cwd() {

  local session_name="$1"

  local save_file="$2"

  tmux display-message -p -t "$session_name" -F "#{session_path}" >>"$save_file"

}

save_windows() {

  local session_name="$1"

  local save_file="$2"

  local format="window$S#{window_index}$S#{window_name}$S#{window_layout}$S#{window_active}"

  tmux list-windows -t "$session_name" -F "$format" >>"$save_file"

}

save_panes() {

  local session_name="$1"

  local save_file="$2"

  local format="pane$S#{pane_index}$S#{pane_current_path}$S#{pane_active}$S#{window_index}$S#{pane_pid}"

  tmux list-panes -s -t "$session_name" -F "$format" |

    while IFS="$S" read -r line; do

      pids=$(ps -ao "ppid,pid" |

        sed "s/^ *//" |

        grep "^$(cut -f6 <<<"$line")" |

        rev |

        cut -d' ' -f1 |

        rev)

      command="$(

        for pid in $pids; do

          while read -r arg; do

            echo -n "'$arg' "

          done <<<"$(xargs -0L1 </proc/"$pid"/cmdline 2>/dev/null)"

        done

      )"

      awk -v command="$command" \

        'BEGIN {FS=OFS="\t"} {$6=command; print}' \

        <<<"$line" >>"$save_file"

    done

}

link_session_last() {

  local save_file="$1"

  local last_file="$2"

  if ! cmp -s "$save_file" "$last_file"; then

    ln -sf "$save_file" "$last_file"

  else

    rm "$save_file"

  fi

}

link_last() {

  local save_file="$1"

  local save_dir="$2"

  ln -sf "$save_file" "$save_dir"/last

}

save_session() {

  local session_name="$1"

  local save_dir="$(get_opt_dir)"

  local save_file="${save_dir}/${session_name}_$(get_time)"

  local last_file="${save_dir}/${session_name}_last"

  save_cwd "$session_name" "$save_file"

  save_windows "$session_name" "$save_file"

  save_panes "$session_name" "$save_file"

  link_session_last "$save_file" "$last_file"

  link_last "$last_file" "$save_dir"

}

save_all_sessions() {

  tmux list-sessions -F "#{session_name}" | while read -r session; do

    save_session "$session"

  done

  local current_session="$(get_current_session_name)"

  if [[ -n "$current_session" ]]; then

    link_last "$(get_opt_dir)/${current_session}_last" "$(get_opt_dir)"

  fi

}

unload_session() {

  local session_name="$1"

  save_session "$session_name"

  tmux kill-session -t "$session_name"

}

# === restore

restore_session_from_file() {

  local session_file="$1"

  local session_name=$(basename "$session_file" | sed 's/_last$//')

  exec <"$session_file"

  start_spinner "Restoring session $session_name"

  local session_path="$(head -n1 | cut -d"$SEPARATOR" -f2)"

  tmux new-session -ds "$session_name" -c "$session_path"

  declare -A window_layouts

  declare active_window

  while read -r line; do

    case $line in

    window*)

      IFS=$S read -r _ window_index window_name window_layout window_active <<<"$line"

      window_id="$session_name:$window_index"

      tmux new-window -k -t "$window_id" -n "$window_name"

      window_layouts["$window_id"]="$window_layout"

      if [[ "$window_active" == "1" ]]; then

        active_window="$window_id"

      fi

      ;;

    pane*)

      IFS=$S read -r _ pane_index pane_current_path pane_active window_index command <<<"$line"

      if [[ "$pane_index" == "$(get_tmux_option base-index 0)" ]]; then

        tmux send-keys -t "$session_name:$window_index" "cd \"$pane_current_path\"" Enter "clear" Enter

      else

        tmux split-window -d -t "$session_name:$window_index" -c "$pane_current_path"

      fi

      if [[ "$pane_active" == "1" ]]; then

        tmux select-pane -t "$session_name:$window_index.$pane_index"

      fi

      if [[ -n "$command" ]]; then

        tmux send-keys -t "$session_name:$window_index.$pane_index" "$command" Enter

      fi

      ;;

    esac

  done

  for window in "${!window_layouts[@]}"; do

    tmux select-layout -t "$window" "${window_layouts[$window]}"

  done

  tmux select-window -t "$active_window"

  tmux switch-client -t "$session_name"

  stop_spinner "Session restored"

}

restore_session() {

  local session_name="$1"

  if tmux has-session -t "$session_name" 2>/dev/null; then

    tmux switch-client -t "$session_name"

    return 0

  fi

  local session_file="$(get_opt_dir)/${session_name}_last"

  if [[ ! -f "$session_file" ]]; then

    tmux display-message "No saved session found for: $session_name"

    return 1

  fi

  restore_session_from_file "$session_file"

}

restore_last() {

  local last_file="$(get_opt_dir)/last"

  if [[ ! -e "$last_file" ]]; then

    tmux display-message "No last session saved"

    return 1

  fi

  local session_name=$(basename "$(readlink "$last_file")" | sed 's/_last$//')

  restore_session "$session_name"

}