# Shell configuration file.

# Copyright (C) 2013-2014  Simon Ruderich
#
# This file is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This file is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.


# Normal umask for root (readable by all users).
if test "`id -u`" -eq 0; then
    umask 022
# Restricted umask for normal users (readable only by me).
else
    umask 077
fi

# Disable flow control (^s and ^q). I use GNU Screen/Tmux which also supports
# this in a similar way (entering copy mode) and enabling flow control by
# accident is annoying.
if test -t 0; then
    stty -ixon -ixoff
fi

# Auto-logout after timeout on TTYs. It's easy to forget to logout after
# switching back to X11 from a TTY.
timeout_setup_screen_lock() {
    echo "Locking GNU screen after $timeout seconds (TTY detected)."
    screen -X idle $timeout lockscreen
    echo
}
timeout_setup_tmux_lock() {
    if type vlock >/dev/null; then
        echo "Locking Tmux after $timeout seconds (TTY detected)."
        tmux set-option lock-after-time $timeout
        echo

    else
        echo "vlock not found, locking won't work in Tmux!" >&2
        echo "Falling back to shell timeout." >&2
        echo

        timeout_setup_shell_logout
    fi
}
timeout_setup_shell_logout() {
    echo "Auto-logout after $timeout seconds (TTY detected)."
    TMOUT=$timeout
    echo
}
# Timeout in seconds.
local timeout >/dev/null 2>&1
timeout=600
case "$TERM" in
    # `tty` doesn't work inside a pseudo-terminal as provided by GNU
    # Screen/Tmux.
    #
    # The following settings for GNU Screen/Tmux will only auto-lock new
    # sessions, not when attaching to existing sessions!
    screen*)
        if test -n "$STY"; then
            case "$STY" in
                *.tty[0-9]*.*)
                    timeout_setup_screen_lock
                    ;;
            esac
        elif test -n "$TMUX"; then
            case "`tmux display -p '#{client_tty}'`" in
                /dev/tty[0-9]*)
                    timeout_setup_tmux_lock
                    ;;
                /dev/*)
                    # Not on TTY, nothing to do.
                    ;;
                *)
                    echo 'Tmux < 1.8 found, TTY check might be incorrect!' >&2

                    local client >/dev/null 2>&1
                    client=`printf '%s' "$TMUX" | sed 's/^.*,\([0-9]*\)$/\1/'`

                    case "`tmux list-clients \
                            | grep -E "^/dev/.*?: $client "`" in
                        /dev/tty[0-9]*)
                            timeout_setup_tmux_lock
                            ;;
                    esac
                    ;;
            esac
        else
            echo 'TERM=screen but neither $STY nor $TMUX found!' >&2
            timeout_setup_shell_logout
        fi
        ;;

    *)
        case `tty` in
            /dev/tty[0-9]*)
                timeout_setup_shell_logout
                ;;
        esac
        ;;
esac
unset timeout
unset timeout_setup_screen_lock
unset timeout_setup_tmux_lock
unset timeout_setup_screen_lock

# vim: ft=sh