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#!/bin/bash
#
# system
#

VERSION="0.1"
USER_CONFIG_FILE="$HOME/.config/conky/conky.conf"
DEFAULT_RSS_URL="https://www.novell.com/newsfeeds/rss/patches/security_notifications-daily.xml"
SYSTEM_LOG="| journalctl -q | tail -n 5"
USERS_LOG="| who"

ALIGNMENTS="|top_left|top_right|top_middle|bottom_left|bottom_right|bottom_middle|middle_left|middle_middle|middle_right,tl|tr|tm|bl|br|bm|ml|mm|mr|"

ip=ip
iwconfig=/usr/sbin/iwconfig
ss=/usr/sbin/ss

# log
function log()
{
  verb=$1
  msg="$2"

if [ $verb -le ${config[verbosity]} ]; then
    echo "$msg" >&2
  fi
}

# bail out
function die()
{
  msg="$1"
  log 0 "conkyconf: $msg"
  log 2 "$0 unsuccessfully finished"
  exit 1
}

# writing string to file
function sys_write_file()
{
  file=$1
  content=$2

dir=$(dirname $file)
  if [ ! -d "$dir" ]; then
    log 1 "creating $dir"
    mkdir -p $dir || die "could not create $dir"
  fi

log 1 "writing $file"

echo "$content" > "$file" || die "could not write $file"
  return
}

# list of all network interfaces
function sys_all_network_interfaces()
{
  interfaces=$($ip -br link show | sed 's:\s\+.*::' | grep -v 'tun\|lo' | tr '\n' ' ')
  log 1 "detected interfaces: $interfaces"
  echo $interfaces
}

# default interface
function sys_default_network_interface()
{
  interface=$($ip route | grep default | sed 's:.*dev $\S\+$ .*:\1:')
  log 1 "detected default interface: $interface"
  echo $interface
}

# wireless or wired network iterface?
function sys_network_interface_type()
{
  interface=$1
  type=$($iwconfig $1 2>&1 | grep -q 'no wireless' && echo "wired" || echo "wireless")
  log 1 "network interface $interface is $type"
  echo $type
}

# attached sdX drives
function sys_drives()
{
  drives=$(find /dev -maxdepth 1 -type b -name "sd[a-z]" -exec basename "{}" ";" | sort)
  log 1 "detected drives: $drives"
  echo $drives
}

# processors
function sys_processors()
{
  CPUS=$(getconf _NPROCESSORS_ONLN)
  CPUS=${CPUS:=1}
  cpus=$(seq 1 $CPUS | tr '\n' ' ')
  log 1 "assuming numbers of CPUs: $cpus"
  echo $cpus
}

# opened ports
function sys_opened_ports()
{
  ports=$($ss -nlt | awk '{print $4}' | grep ':::\|\*:' | sed 's/:::\|\*://' | sort -u)
  log 1 "opened ports: $ports"
  echo $ports
}

#
# global config
#

function conky_config()
{
  cat << EOS
conky.config = {
        background = true,
        update_interval = 1.5,
        cpu_avg_samples = 2,
        net_avg_samples = 2,
        out_to_console = false,
        override_utf8_locale = true,
        double_buffer = true,
        no_buffers = true,
        text_buffer_size = 32768,
        imlib_cache_size = 0,
        own_window = true,
        own_window_type = 'desktop',
        own_window_argb_visual = true,
        own_window_argb_value = 120,
        own_window_hints = 'undecorated,below,sticky,skip_taskbar,skip_pager',
        border_inner_margin = 20,
        border_outer_margin = 0,
        alignment = '${config[alignment]}',
        gap_x = ${config[gap_x]},
        gap_y = ${config[gap_y]},
        draw_shades = true,
        draw_outline = false,
        draw_borders = false,
        draw_graph_borders = false,
        use_xft = true,
        font = 'monospace:size=9',
        xftalpha = 0.8,
        uppercase = false,
        default_color = '#FFFFFF',
        own_window_colour = '#000000',
        maximum_width = 375
};

EOS
}

#
# contents of the window
#

# horizontal rule
function text_hr()
{
  echo "        \${goto 20}\${hr}"
}

# hostname, kernel, date and uptime
function text_preamble()
{
  cat << EOS
        \${goto 20}\${color #DD3A21}\${font monospace:bold:size=20}\${nodename}\${font}\${color}\${goto 250}\${font FontAwesome}\${font}\${voffset -2} \${time %d/%m/%y}
        \${goto 20}\${color #DD3A21}\${kernel}\${color}\${goto 250}\${font FontAwesome}\${font}\${voffset -2} \${time %H:%M}
        \${goto 250}\${font FontAwesome}\${font}\${voffset -2} \${uptime}
EOS
}

# show one network interface info
function text_network_interface
{
  if_name=$1
  case $(sys_network_interface_type $if_name) in
    "wired")    icon=  text="" ;;
    "wireless") icon=; text="\${exec eval \$(/usr/sbin/iwconfig $if_name | grep 'Link Quality' | sed 's:.*Quality=$[0-9]\+$/$[0-9]\+$.*:echo \$((\1*100/\2))%:')}" ;;
  esac
  cat << EOS
        \${goto 20}\${font FontAwesome}$icon\${font}\${voffset -2} $if_name \${addrs $if_name} $text
        \${goto 20}\${upspeedgraph $if_name 30,178 06E9F8 2104FA}\${goto 202}\${downspeedgraph $if_name 30,175 FFFF00 DD3A21}
        \${goto 20}\${font FontAwesome}\${font}\${voffset -2} \${upspeed $if_name}\${font FontAwesome}\${goto 202}\${font}\${voffset -2} \${downspeed $if_name}
EOS
}

# memory info
function text_memory
{
  cat << EOS
        \${goto 20}\${font FontAwesome}\${font}\${voffset -2} \${mem}/\${memmax} (\${memperc}%) | Swap: \${swapperc}%
        \${goto 20}\${memgraph 30,355 AAF5D0 00B35B}
EOS
}

# attached drive info
function text_drive
{
  name=$1

cat << EOS
        \${goto 20}\${font FontAwesome}\${font}\${voffset -2} $name 
        \${goto 20}\${diskiograph_read $name 30,178 06E9F8 2104FA}\${goto 202}\${diskiograph_write $name 30,175 FFFF00 DD3A21} 
        \${goto 20}\${font FontAwesome}\${goto 20}\${font}\${voffset -2} \${diskio_read $name}\${font FontAwesome}\${voffset -2}\${goto 202}\${font} \${diskio_write $name}
EOS
}

# processor info
function text_processor
{
  name=$1
  cat << EOS
        \${goto 20}CPU$name: \${goto 90}\${cpu cpu$name}%\${goto 140}\${cpubar cpu$name 7,70}\${goto 230}\${freq_g $name} GHz
EOS
}

# process table
function text_processes
{  
  echo  "        \${color #FFFF00}\${goto 20}Name \${goto 200}Pid\${goto 255}Cpu%\${goto 310}Mem%\${color}"
  for i in $(seq 1 5); do
    echo "        \${goto 20}\${top name $i} \${goto 180}\${top pid $i}\${goto 235}\${top cpu $i}\${goto 290}\${top mem $i}"
  done
}

# rss feed
function text_rss
{
  url=$1
  cat << EOS
        \${goto 20}\${font FontAwesome}\${font}\${voffset -2} \${color #FFFF00}\${scroll 50 2 \${rss $url 10 item_titles 5}}\${color}
EOS
}

# port monitor
function text_portmon()
{
  port_range=$1
  
  echo -n "        \${goto 20}"
  if [[ $port_range =~ "-" ]]; then
    echo -n "\${font FontAwesome}\${font}\${voffset -2} Port range $port_range"
    port_range="$(tr '-' ' ')"
  else
    echo -n "\${font FontAwesome}\${font}\${voffset -2} Port $port_range"
    port_range="$port_range $port_range"
    echo -n ", service \${tcp_portmon $port_range lservice 0}"
  fi
  echo " (\${tcp_portmon $port_range count} connections)"

for i in $(seq 0 4); do
    echo -n "        \${goto 20}\${font monospace:size=8}"
    echo -n "\${if_match \"\${tcp_portmon $port_range rip $i}\" != \"\"}"
    echo -n "\${tcp_portmon $port_range rip $i}:"
    echo -n "\${tcp_portmon $port_range rport $i} "
    echo -n "\${tcp_portmon $port_range rhost $i} "
    echo -n "\${if_match \"\${tcp_portmon $port_range rport $i}\" != \"\${tcp_portmon $port_range rservice $i}\"}"
    echo -n "\${tcp_portmon $port_range rservice $i} "
    echo -n "\${endif}"
    echo -n "\${else}"
    echo -n "-"
    echo -n "\${endif}"
    echo "\${font}"
 done

}

# text when no port are defined
function text_portmon_no_ports()
{
  echo "        \${goto 20}Port monitor: no ports defined."
}

# logfile (including program outputs)
function text_log
{
  logfile=$1
  font_size=${2:-8}

echo -n "        \${goto 20}\${font monospace:size=$font_size}"
  if [[ "$logfile" =~ ^[[:space:]]*\| ]]; then
     logfile=$(echo $logfile | sed 's:^\s*|\s*::')
     log 1 "will read log from [$logfile] program"
    echo -n \${texeci 10 $logfile}
  else
    log 1 "will read log from [$logfile] file"
    echo -n \${tail $logfile 5}
  fi
  echo \${font}
}

# string is integer
function arg_is_numeric()
{
  [[ "$1" =~ ^[0-9]+$ ]] && return 0 || return 1
}

# string is option
function arg_is_option()
{
  arg=$1
  [ ${arg:0:1} == '-' ] && return 0 || return 1
}

function arg_is_alignment()
{
  [[ "$ALIGNMENTS" =~ "|$1|" ]] && return 0 || return 1
}

# end of argument list
function arg_is_end()
{
  [ -z "$1" ] && return 0 || return 1
}

# split list argument, delimiters: [:,;]
function arg_split_list()
{
  echo $1 | tr ':,;' ' '
}

# help on this script usage
function conkyconf_usage()
{
  cat << EOS
$(echo ${0##*/} | tr [a-z] [A-Z]), version $VERSION

conky configuration example generator

USAGE

conkyconf --par1 [arg11 [arg12]] --par2 [arg21 [arg22]] ...

There are object parameters (as --memory, --networkif, --rule) and 
 non-object parameters (as --verbosity, --file). Object parameters
 will add corresponding objects to conky configuration in that
 order. Objects can be repeated for different arguments by 
 repeating it on command line.

More conky instantions can be launched, but then different configuration
 files has to be used (see -f|--file option).

Configuration is written to

$USER_CONFIG_FILE

which has a precedence before system wide configuration file.

PARAMETERS

-h|--help                  this help
     -v|--verbosity [verb]      debug output of the script, 0 (just errors)
                                1 or 2
     -f|--file <conffile>       write the configuration to this file
     -g|--geometry [a [x [y]]]  geometry of conky window, parameters:
                                * a -- alignment top_left (tl), bottom_middle 
                                       (bm), middle_left (ml), middle_middle 
                                       (mm), etc.
                                * x -- gap between window and attached 
                                       vertical border
                                * y -- gap between window and attached 
                                       horizontal border

-r|--rule                  add horizontal rule
     -p|--preamble              host, kernel, time and uptime info
     -n|--networkif [ifcs]      network interface(s) info; arguments:
                                * 'all'    -- all interfaces are monitored
                                * <no arg> -- default interface is chosen
                                * <list>   -- comma, colon or semicolon
                                          separated list of interfaces
     -m|--memory                memory info
     -d|--drives [drvs]         sdaX drives info; arguments:
                                * 'all'    -- all drives are monitored
                                * <no arg> -- the same as 'all'
                                * <list>   -- comma, colon or semicolon
                                          separated list of drives
     -c|--cpu                   add all CPUs info
     -e|--processes             show process table
     -s|--rss [url]             add a rss feed; if no url is given,
                                SUSE security rss feed is chosen
     -t|--portmon [ports]       display port monitor; arguments:
                                * <no arg> -- display opened ports
                                * <list>   -- comma, colon or semicolon
                                              separated list of ports
     -l|--log [log [fs]]       show tail of a log; arguments:
                               log:
                                * | <program> -- show output of the 
                                                 program
                                * <file>      -- show last 5 lines of 
                                                 the log
                                * <noarg>     -- $SYSTEM_LOG
                               fs: font size of the output

-u|--default             choose default profile; objects can be added
                               or prepended

NOTE

Everytime some of monitored objects are changed, for example new port is 
 opened, usb stick is plugged in or connection is changed from wireless to 
 wired (and just default interface is monitored), then conkyconf has to be
 rerun. conky then rereads the configuration automatically.

EXAMPLES

conkyconf --default

Uses built in preset.

conkyconf --preamble -r --networkif -r --drives -r --cpu

Shows preamble, default network interface, all attached
      drives and cpu information, in that order.

conkyconf --preamble -r --drives sda:sdb -r --networkif em1 \\
             -r --cpu -r --log '|who' 8  -r --log
      
      Displays peramble, network drives sda and sdb, interface em1 and
      cpu information and also output of who command in font size 8
      and system log in default font size for logs.
EOS
}

declare -A contents
declare -A contents_arg
declare -A config

config[verbosity]=0
config[file]="$USER_CONFIG_FILE"
config[alignment]="bottom_right"
config[gap_x]="70"
config[gap_y]="70"

if [ -z "$1" ]; then
  set -- "--help"
fi

content_index=0
while [ -n "$1" ]; do
  arg_is_option "$1" || die "option starting with '-' or '--' expected ($1)"

case "$1" in
    -h|--help)
      conkyconf_usage
      exit 0
      ;;
    -v|--verbosity)
      shift
      if ! arg_is_end "$1" && arg_is_numeric "$1"; then 
        config[verbosity]="$1"
        shift; 
      else
        config[verbosity]=2
      fi
      log 1 "verbosity set to ${config[verbosity]}"
      ;;
    -p|--preamble)
      shift
      log 2 'adding preamble'
      contents[$content_index]="preamble"
      content_index=$((content_index+1))
      ;;
    -r|--hrule)
      shift
      log 2 'adding horizontal rule'
      contents[$content_index]="hrule"
      content_index=$((content_index+1))
      ;;
    -n|--networkif)
      shift
      if ! arg_is_end "$1" && ! arg_is_option "$1"; then
        if [ $1 == "all" ]; then
          devices="$(sys_all_network_interfaces)"
        else
          devices="$(arg_split_list $1)"
        fi
        shift
      else
        devices="$(sys_default_network_interface)"
      fi
      log 2 "adding network interface monitor: $devices"
      contents[$content_index]="networkif"
      contents_arg[$content_index]="$devices"
      content_index=$((content_index+1))
      ;;
    -m|--memory)
      shift
      log 2 'adding memory info'
      contents[$content_index]="memory"
      content_index=$((content_index+1))
      ;;
    -d|--drives)
      shift
      # -d and -d all the same effect
      if ! arg_is_end "$1" && ! arg_is_option "$1"; then
        if [ "$1" == "all" ]; then
          drives="$(sys_drives)"
        else
          drives="$(arg_split_list $1)"
        fi
        shift
      else
        drives="$(sys_drives)"
      fi
      log 2 "adding hard drives: $drives"
      contents[$content_index]="drives"
      contents_arg[$content_index]="$drives"
      content_index=$((content_index+1))
      ;;
    -c|--cpu)
      shift
      processors="$(sys_processors)"
      log 2 "adding cpu units: $processors"
      contents[$content_index]="processors"
      contents_arg[$content_index]="$processors"
      content_index=$((content_index+1))
      ;;
    -e|--processes)
      shift
      log 2 "adding process table"
      contents[$content_index]="processes"
      content_index=$((content_index+1))
      ;;
    -s|--rss)
      shift
      if ! arg_is_end "$1" && ! arg_is_option "$1"; then
        url="$1"
      else
        url="$DEFAULT_RSS_URL"
      fi
      log 2 "adding rss feed: $url"
      contents[$content_index]="rss"
      contents_arg[$content_index]="$url"
      content_index=$((content_index+1))
      ;;
    -t|--portmon)
      shift
      if ! arg_is_end "$1" && ! arg_is_option "$1"; then
        port_ranges="$(arg_split_list $1)"
        shift
      else
        port_ranges="$(sys_opened_ports)"
      fi
      log 2 "adding port monitor for port ranges: $port_ranges"
      contents[$content_index]="portmon"
      contents_arg[$content_index]="$port_ranges"
      content_index=$((content_index+1))
      ;;
    -l|--log)
      shift
      if ! arg_is_end "$1" && ! arg_is_option "$1" && ! arg_is_numeric "$1"; then
        log="$1"
        shift
      else
        log="$SYSTEM_LOG"
      fi
      if ! arg_is_end "$1" && ! arg_is_option "$1"; then
        if arg_is_numeric "$1"; then
          font_size="$1"
          shift
        else
          die "numeric argument (font size of the log) expected"
        fi
      else
        font_size=6
      fi
      log 2 "adding logging: $log"
      contents[$content_index]="log:$font_size"
      contents_arg[$content_index]="$log"
      content_index=$((content_index+1))
      ;;
    -u|--default)
      shift
      contents[0]="preamble"
      contents[1]="hrule"
      contents[2]="networkif"
      contents_arg[2]="$(sys_default_network_interface)"
      contents[3]="hrule"
      contents[4]="drives"
      contents_arg[4]="$(sys_drives)"
      contents[5]="hrule"
      contents[6]="processors"
      contents_arg[6]="$(sys_processors)"
      contents[7]="hrule"
      contents[8]="processes"
      contents[9]="hrule"
      contents[10]="portmon"
      contents_arg[10]="$(sys_opened_ports)"
      contents[11]="hrule"
      contents[12]="log:8"
      contents_arg[12]="$USERS_LOG"
      contents[13]="hrule"
      contents[14]="log:6"
      contents_arg[14]="$SYSTEM_LOG"
      contents[15]="hrule"
      contents[16]="rss"
      contents_arg[16]="$DEFAULT_RSS_URL"
      content_index=17
      ;;
    -f|--file)
      shift
      if ! arg_is_end "$1" && ! arg_is_option "$1"; then
        config[file]="$1"
        shift
      else
        die "-f|--file requires an argument"
      fi
      ;;
    -g|--geometry)
      shift
      if ! arg_is_end "$1" && ! arg_is_option "$1"; then
        if ! arg_is_alignment "$1"; then
          die "first argument of -g|--geometry has to be one of $ALIGNMENTS"
        fi
        config[alignment]="$1"
        shift
        if ! arg_is_end "$1" && ! arg_is_option "$1"; then
          if ! arg_is_numeric "$1"; then
            die "second argument of -g|--geometry has to be a number"
          fi
          config[gap_x]="$1"
          shift
          if ! arg_is_end "$1" && ! arg_is_option "$1"; then
            if ! arg_is_numeric "$1"; then
              die "third argument of -g|--geometry has to be a number"
            fi
            config[gap_y]="$1"
            shift
          fi
        fi
      else
        die "-g|--geometry requires an argument"
      fi
      ;;
    *)
      die "unsupported option ($1)"
      shift
      ;;
  esac
done

log 2 "arguments parsed"

log 1 "geometry: ${config[alignment]}, ${config[gap_x]}, ${config[gap_y]}"

log 2 "creating configuration"
conky_configuration="$(conky_config)$(conky_text)"

log 2 "wrinting configuration"
sys_write_file ${config[file]} "$conky_configuration"

log 2 "$0 successfully finished"