#!/bin/bash

VERSION=20140416

function display_self {
    $0 $0
    exit 0
}
[ -z "$1" ] && display_self 
[ "$1" = "-h" ] && display_self 

[ -f "$1" ] || {
    echo Cannot find file: $1
    exit 1
}

E='\x1b['
H="${E}1m"
Z="${E}0m"
CLS="${E}2J${E}H"
#list of text colors:
BLACK="${E}30m"
R="${E}31m"
G="${E}32m"
B="${E}34m"
Y="${E}33m"
M="${E}35m"
C="${E}36m"
W="${E}37m"
#list of BG colors:
BGR="${E}41m"
BGG="${E}42m"
BGB="${E}44m"
BGY="${E}43m"
BGM="${E}45m"
BGC="${E}46m"
BGW="${E}47m"

CONF_LINE=( \${H} \${Z} \${R} \${G} \${B} \${Y} \${M} \${C} \${W}
    \${BLACK} \${BGR} \${BGG} \${BGB} \${BGY} \${BGM} \${BGC} \${BGW} )

for (( r=0; r<${#CONF_LINE[@]}; r++ ));
    do  value=CONF_LINE[$r]
        replace=$( eval echo ${!value} )
    REGEX="$REGEX -e 's/\(${CONF_LINE[$r]}\)/"${replace}"/g'"
 done
#echo $REGEX
#exit

i=1
MENU=1
while true
do 
    # print slide $i
    NO_SLIDES=$( grep -ce "^# " "$1" )
    COLS=$(( $( tput cols ) - 3 ))
    j=$(( $i + 1 ))
    echo -en "$CLS"
    awk 'match($0,/^# /){
            c++; 
            print c $0;
     }
     !/^# /{
            print $0;
     }
' "$1" | sed -n '/^'$i'# /,/^'$j'# /p' | grep -v "^$j# " | sed 's,^'$i'\(# .*\),'$H'\1'$Z',' | eval sed $REGEX 
    # ask for user input
    #  1 back,  2 forward, q exit, h help
    echo -ne "${Z}${E}1;${COLS}H"
    [ -z "$MENU" ] || {
        echo -ne "${i}/${NO_SLIDES}"
        echo -ne "${E}1B${E}3D1:▶"
        echo -ne "${E}1B${E}3D2:◀"
        echo -ne "${E}1B${E}3Dq:x"
        echo -ne "${E}1B${E}3Dh:▲${E}4A"
    }
    read -s -N 1  cmd
    
    case "$cmd" in
        2)
            i=$(( $i - 1 ))
            [ $i -lt 1 ] && i=1
        ;;
        1)
            i=$(( $i + 1 ))
            [ $i -gt $NO_SLIDES ] && i=$NO_SLIDES
        ;;
        h)
            [ -z "$MENU" ] && {
                MENU=1
            } || {
                unset MENU
            }
        ;;
        x|q)
            echo -ne "${E}1E"
            exit
        ;;
        esac
    done

done
exit 
"
# Markdown Slide Presenter: MarkSlider

* This tool prints a text file as slides, 
  retaining the formatting. Consider
  using markdown syntax.
* Syntax ref: http://daringfireball.net/projects/markdown/syntax
    * The only parsed syntax is the new slide syntax:
      A row starting with '# ' 

## How to use ##
* Give the markdown file as argument
* Move to the next slide with key 1
* Move to the previous slide with key 2
* Exit with q or x
* Hide menu with h
* The numbers on the right show the current
  and number of slides in this presentation

# Hints: Tables

* Create tables with "ncsv -m"

Object  Area  Perimeter
------- ----- ----------
    1   358      68.28
    2   444      77.36
    3   507      92.18
    4  1026      118.6
    5   539      84.18

# Hints: Plots
* Create plots with gnuplot: 
  set term dumb 60 15 enhanced
  set parametric; set trange [0:10*pi]; set yrange[-5*pi:5*pi]
  set xrange[-10*pi:10*pi]; plot t*cos(t), t*sin(t)
  15 ++-----*-+---**--+--------+-------+**-----*-------++
     |+   **  +  **   +  *****t*cos(t), t*sin(t)*******+|
     |    *    **     ***          ***     **    *      |
  10 ++  *    **    ***               **    **    *    ++
     |  **    *    **     ********     **    *    *     |
   5 ++ *    **    *    ***       **    *    **   **   ++
     |  *    *    *    **          **   **    *    *    |
   0 ++ *    *    *    *    ****    *    *    *    *   ++
     |  *    *    *    *    *      **   **    *    *    *
     |  *    *    *    *    **   ***    *    **   **    *
  -5 ++ *    *    *    **    *****     **    *    *    **
     |  *    **    *    **           ***    **    *    *|
 -10 ++ **    *    **     ***     ****     **    *     *+
     |   *    **    **       ******      **     **    * |
     |+   *   + *     ***      +       ***     **    * +|
 -15 ++----*--+--*----+-**-----+-----**+------*+----*--++
     -30     -20     -10       0       10      20      30

# Hints: ${R}Co${Y}lo${G}rs

* Use ANSI codes directly for colors, or shortcuts: 
  ${R}red: ${ R}, ${G}green: ${ G}, ${B}blue: ${ B}${Z}
  Colors: R G B C M Y W BLACK
  ${H}Bright modifier: ${ H}, ex: ${H}${Y}yellow ${ H}${ Y}${Z}
  Background colors:${H}${C}${BGM} bright cyan on magenta ${ H}${ C}${ BGM} ${Z}
  Background colors: BGR BGG BGB BGC BGM BGY BGW
  Reset colors with ${ Z}


# Hints: Presenting

* Use a terminal with large font, perhaps 80 columns on screen
* Fullscreen often with F11
                    ┌──────┐ 
* Get creative with │Ascii!│ 
                    └┬────┬┘ 

# Hints: Other tools

* Check out tools like:
    * toilet
   m             "    ""#             m   
 mm#mm   mmm   mmm      #     mmm   mm#mm 
   #    #" "#    #      #    #"  #    #   
   #    #   #    #      #    #""""    #   
   "mm  "#m#"  mm#mm    "mm  "#mm"    "mm 
    * boxes 
        _ ._  _ , _ ._
      (_ ' ( `  )_  .__)
    ( (  (    )   `)  ) _)
   (__ (_   (_ . _) _) ,__)
       `~~`\ ' . /`~~`
       ,::: ;   ; :::,
      ':::::::::::::::'
 _jgs______/_ __ \__________
|                           |
|         MarkSlider        |
|___________________________|

# Hints: More tools
* JPEG to ascii: jp2a
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MMMMNNNNNMNOkOXMMKolkNMMW0ocdOXWMMMMMMWX
MMMNNNNNMNOkONMMkldNMMWx:dXMMMMWKOxxxOKW
MMWNNNNMWOkkNMMxlxWMMK;oWMMMXoloOXNWNXOd
MMNNNNWM0kkKMMOldMMM0,OMMMNclNMMMMM:WMMM
MWNNNNMNkkOWMNllNMMN,xMMMN'KMMMMMMM NMMM
MWNNNNMXkk0MM0ldMMMx,WMMM;kMMMMMMMW XMMM
MWNNNWMKkk0MMOlxMMMl:MMMM.NMMMMMMMO.xMMM
MWNNNNMXkk0MM0ldMMMx,WMMM;kMMMMMMN.; KMM
MWNNNNMNkkOWMNllNMMN,xMMMN'KMMMMK..,. 0M
MMNNNNWM0kkKMMOldMMM0,OMMMNclNMN:;NMW:;K
MMWNNNNMWOkkNMMxlxWMMK;oWMMMXoloOXNWNXOd
MMMNNNNNMNOkONMMkldNMMWx:dXMMMMWKOxxxOKW
MMMMNNNNNMNOkOXMMKolkNMMW0ocdOXWMMMMMMWX
MMMMMNNNNNMNkkkKMMWdll0MMMMMOc,,;cllc;,,