Command Line Status Printer

#!/bin/bash
# a dynamic Command Line Status printer

#Copyright 2012 Wesley (kbmonkey) Werner

#This program 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 program 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 program.  If not, see <http://www.gnu.org/licenses/>.

# For when just piping to your WM bar isn't enough ;)

# USAGE

# - place this file in your PATH, like ~/bin/clis
# - make executable: chmod +x ~/bin/clis
# - configure keyboard shortcuts to: echo "mode?" > /tmp/clis-mode
#   where ? is 1 to 4

# ~/.xbindkeysrc example using Super-F1 to F4:
# use 'xbindkeys --key' to find the key codes.
#
#   "echo 'mode1' > /tmp/clis-mode"
#       Mod2 + Mod4 + F1
#
#   "echo 'mode2' > /tmp/clis-mode"
#       Mod2 + Mod4 + F2
#
#   "echo 'mode3' > /tmp/clis-mode"
#       Mod2 + Mod4 + F3
#
#   "echo 'mode4' > /tmp/clis-mode"
#       Mod2 + Mod4 + F4
#
# NOTIFICATIONS
#
# Write notification strings to /tmp/clis-notify
# to show a quick message.
#
# launch clis at login autostart: clis &
# enjoy toggling your bar infos back and forth :)
#
# kbmonkey!
#
# CHANGES
#
# 2013-02-13
# + add DEFAULT_UPDATE_SPEED
# + detect /tmp/clis-notify and show it's contents for DEFAULT_UPDATE_SPEED * 4
# + check if any of the files exist before reading them
# + append notifications to /tmp/clis-history
#
################################################################################
#
# seconds between updates
DEFAULT_UPDATE_SPEED=2

# help text lists the modes available
HELPLINE=" &6S-F2 &5Now Playing &6S-F3 &5Conky &6S-F4 &5Todo"

# append to help text the WM shortcuts
HELPLINE="&8S-A-# &7send to follow &8W-S-# &7send to no follow &8W-A &7rotate mode &8W-Tab &7last space &8S-A-j/k/o/p &7move"$HELPLINE
#
# for debugging: diplay snapwm colors
#HELPLINE="&1 color1 &2 color2 &3 color3 &4 color4 &5 color5 &6 color6 &7 color7 &8 color8 &9 color9"

# MAIN LOOP
#
################################################################################
#
while true
do
    # reset update speed
    UPDATE_SPEED=$DEFAULT_UPDATE_SPEED

    # get the mode and notification text
    if [ -e "/tmp/clis-mode" ]; then
        ACTION=`cat /tmp/clis-mode`
        else ACTION=""
        fi
    if [ -e "/tmp/clis-notify" ]; then
        NOTIFY=`cat /tmp/clis-notify`
        else NOTIFY=""
        fi

    # there are notifications
    if [[ "$NOTIFY" != "" ]]; then
        # override the action to bypass the default help text
        ACTION="notify"
        # set the notification text
        INFOLINE="&9$NOTIFY"
        # show it for longer than the default
        UPDATE_SPEED=$[DEFAULT_UPDATE_SPEED * 4]
        # remove the notification file
        rm /tmp/clis-notify
        # write to notification history
        echo `date +"%D %T"` "-" $NOTIFY >> /tmp/clis-history
        # foo
        fi

    # set the text to display based on what mode is set
    case "$ACTION" in
    mode2)
        # now playing
        INFOLINE="`ncmpcpp --now-playing '&5{{%t, &6by %a, from %b}}|{{%f}}'`"
        ;;
    mode3)
        # conky: configured with out_to_console (yes) and out_to_x (no)
        # ensure you symlink your conky config to ~/.conkyrc
        INFOLINE=`conky -i 1 -c ~/.conkyrc`
        # conky top cpu is faulty in out_to_console mode.
        # (my guess it uses internal cpu averaging and not system values)
        # add top 2 (head) processes
        INFOLINE="$INFOLINE &8`ps -eo '%C%% %c' | sort -k1 -n -r | head -2 | tr '\n' ' '`"
        ;;
    mode4)
        # next calcurse appointment & top todo item
        INFOLINE=`calcurse -n | tr -s '\n' ' '`
        INFOLINE="&5$INFOLINE  &8`cat ~/.calcurse/todo | head -n 1`"
        ;;
    notify)
        # notification text
        # this is here simply to bypass the *) test from setting the $HELPLINE
        ;;
    *)
        # hotkey help
        INFOLINE=$HELPLINE
        ;;
    esac

    # append the time
    INFOLINE="$INFOLINE &4#! `date +%T`"

    # set the root window title, which is how snapwm gets it's bar text.
    # if you use another WM that has text piped to it's bar
    # you can just echo "$INFOLINE".
    xsetroot -name "$INFOLINE"
    echo "$INFOLINE"

    # sleep until next time
    sleep $UPDATE_SPEED

done