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#!/bin/bash
#
# A lightweight session manager.
# Open a work session, which might consist of VIM, tmux, etc sessions.
#

# Parameters
NAME="$0"
BASENAME="`basename $0`"
CONFIG="$HOME/.config/session"
CUSTOM="$CONFIG/custom"
IGNORE="$CONFIG/ignore"

# Check if a given program is not being ignored by configuration
function __session_not_ignored {
  if [ -z "$1" ]; then
    return 1
  fi

  if [ ! -e "$IGNORE" ]; then
    return 0
  fi

  if grep -q "^$1$" $IGNORE; then
    return 1
  fi

  return 0
}

# Query for program sessions
function __session_query {
  # Custom
  if __session_not_ignored custom && [ -d "$CUSTOM" ]; then
    ls -1 $CUSTOM
  fi

  # VIM
  if __session_not_ignored vim && [ -e "$HOME/.local/share/vim/sessions" ]; then
    ls -1 $HOME/.local/share/vim/sessions | sed -e 's/\.vim//g'
  fi

  # Tmux
  if __session_not_ignored tmux && [ -d "$HOME/.tmux" ]; then
    ls -1 $HOME/.tmux
  fi

  # Screen
  #if __session_not_ignored screen && [ -d "$HOME/.screen" ]; then
  #  ls -1 $HOME/.screen
  #fi

  # Luakit
  if __session_not_ignored luakit && [ -d "$HOME/.local/share/luakit/sessions" ]; then
    ls -1 $HOME/.local/share/luakit/sessions
  fi

  # Qutebrowser
  if __session_not_ignored qutebrowser && [ -d "$HOME/.local/share/qutebrowser" ]; then
    ls -1 $HOME/.local/share/qutebrowser
  fi

  # Chromium
  if __session_not_ignored chromium && [ -d "$HOME/.config/chromium-profiles" ]; then
    ls -1 $HOME/.config/chromium-profiles
  fi

  # Firefox
  if __session_not_ignored firefox && [ -d "$HOME/.mozilla/firefox/profiles" ]; then
    ls -1 $HOME/.mozilla/firefox/profiles
  fi
}

# List available sessions
function __session_list {
  n="0"
  __session_query | sort | uniq | while read session; do
    echo -en "$n. $session:"

    # Custom
    if __session_not_ignored custom && [ -e "$CUSTOM/$session" ]; then
      echo -n " custom"
    #else
    #  echo " -"
    fi

    # Check VIM session
    if __session_not_ignored vim && [ -e "$HOME/.local/share/vim/sessions/$session.vim" ]; then
      echo -n " vim"
    #else
    #  echo " -"
    fi

    # Check tmux session
    if __session_not_ignored tmux && [ -e "$HOME/.tmux/$session" ]; then
      echo -n " tmux"
    #else
    #  echo " -"
    fi

    # Screen
    if __session_not_ignored screen && [ -e "$HOME/.screen/$session" ]; then
      echo -n " screen"
    #else
    #  echo " -"
    fi

    # Luakit
    if __session_not_ignored luakit && [ -e "$HOME/.local/share/luakit/sessions/$session" ]; then
      echo -n " luakit"
    #else
    #  echo " -"
    fi

    # Qutebrowser
    if __session_not_ignored qutebrowser && [ -d "$HOME/.local/share/qutebrowser/$session" ]; then
      echo -n " qutebrowser"
    #else
    #  echo " -"
    fi

    # Chromium
    if __session_not_ignored chromium && [ -d "$HOME/.config/chromium-profiles/$session" ]; then
      echo -n " chromium"
    #else
    #  echo " -"
    fi

    # Firefox
    if __session_not_ignored firefox && [ -d "$HOME/.mozilla/firefox/profiles/$session" ]; then
      echo -n " firefox"
    #else
    #  echo " -"
    fi

    echo ""
    let ++n
  done | column -t -c 6 #| sed -e 's/^/\t/'
}

# Session chooser mennu
function __session_chooser {
  __session_list
  read -rep "Choose session: " n

  if [ ! -z "$n" ]; then
    session="$(__session_list | grep -E "(^$n.| $n:)" | sed -e "s/^[0-9]*. //" | cut -d : -f 1)"

    if [ ! -z "$session" ]; then
      __session_open $session
    fi
  fi
}

# Run a program
function __session_exec {
  if [ -z "$1" ]; then
    return
  fi

  # Ensure it won't be killed if parent exit
  nohup setsid $* >> $HOME/.xsession-errors 2>&1 &

  # Indicate that we should wait for the main script to wait
  # while the program starts
  SHOULD_SLEEP="5"
}

# Open a session
function __session_open {
  local session="$1"

  # Custom
  if __session_not_ignored custom && [ -e "$CUSTOM/$session" ]; then
    __session_exec $CUSTOM/$session
  fi

  # Check VIM session
  if __session_not_ignored vim && [ -e "$HOME/.local/share/vim/sessions/$session.vim" ]; then
    if which vim &> /dev/null; then
      __session_exec terminal vim -S $HOME/.local/share/vim/sessions/$session.vim
    fi
  fi

  # Check tmux session
  if __session_not_ignored tmux && [ -e "$HOME/.tmux/$session" ]; then
    if which tmux &> /dev/null; then
      __session_exec terminal shell $session
    fi
  fi

  # Screen
  if __session_not_ignored screen && [ -e "$HOME/.screen/$session" ]; then
    if which screen &> /dev/null; then
      __session_exec terminal wscreen $session
    fi
  fi

  # Luakit
  if __session_not_ignored luakit && [ -e "$HOME/.local/share/luakit/sessions/$session" ]; then
    if which luakit &> /dev/null; then
      export LUAKIT_SESSION="$session"
       __session_exec luakit
    fi
  fi

  # Qutebrowser
  if __session_not_ignored qutebrowser && [ -d "$HOME/.local/share/qutebrowser/$session" ]; then
    if which qutebrowser &> /dev/null; then
      __session_exec qutebrowser -r $session
    fi
  fi

  # Chromium
  if __session_not_ignored chromium && [ -d "$HOME/.config/chromium-profiles/$session" ]; then
    if which chromium-profile &> /dev/null; then
      __session_exec chromium-profile $session
    fi
  fi

  # Firefox
  if __session_not_ignored firefox && [ -d "$HOME/.mozilla/firefox/profiles/$session" ]; then
    __session_exec firefox-profile $session
  fi
}

# Ensure config folders exist
mkdir -p $CONFIG $CUSTOM

# Dispatch
if [ "$BASENAME" == "session-list" ]; then
  __session_list
elif [ "$BASENAME" == "session-chooser" ]; then
  __session_chooser
elif [ "$BASENAME" == "terminal-session-chooser" ]; then
  terminal session-chooser
elif [ ! -z "$1" ] && echo "$1" | grep -q -- '--list'; then
  __session_list
elif [ ! -z "$1" ] && echo "$1" | grep -q -- '--chooser'; then
  __session_chooser
elif [ -z "$1" ]; then
  echo "usage: $BASENAME [--list|--chooser] <session>"
  echo "available sessions:"
  echo ""
  __session_list
  exit 1
else
  __session_open $*
fi

# Check if we should wait programs to exec
if [ ! -z "$SHOULD_SLEEP" ]; then
  sleep $SHOULD_SLEEP
fi