shellpresent

   1 #!/bin/bash
   2 #
   3 # Present a list of shell commands by single-stepping and echoing commands.
   4 # Note that this only works well for self-contained single lines, no multi-line
   5 # loops etc.
   6 #
   7 # (c) 2009 Martin Pitt <martin@piware.de>
   8 # License: Public Domain
   9
  10 NORMAL=""
  11 BOLD=";1"
  12 STATE=$NORMAL
  13
  14 OFF=0
  15 RED=31$STATE
  16 GREEN=32$STATE
  17 YELLOW=33$STATE
  18 BLUE=34$STATE
  19 MAGENTA=35$STATE
  20 CYAN=36$STATE
  21
  22 # Presentation colors
  23 COMMENT=$GREEN
  24 PROMPT=$RED
  25 CMD=$BLUE
  26 OUTPUT=$OFF
  27
  28 if [ "x$1" = 'x--dark' ]; then
  29     shift || true
  30     STATE=$BOLD
  31     CMD=$YELLOW
  32 fi
  33
  34 [ -e "$1" ] || {
  35     echo "Usage: $0 [--dark] <shell script>" >&2
  36     exit 1
  37 }
  38
  39 clear
  40 echo -en "\e[${PROMPT}m\$\e[${CMD}m "
  41
  42 while read line; do
  43     # paragraph clears screen
  44     if [ -z "$line" ]; then
  45         clear
  46         echo -en "\e[${PROMPT}m\$\e[${CMD}m "
  47         continue
  48     fi
  49
  50     # comment
  51     if [ "${line:0:1}" = "#" ]; then
  52         if [ -n "${line:1}" ]; then
  53             echo -e "\r\e[${COMMENT}m$line\e[${CMD}m"
  54             echo -en "\e[${PROMPT}m\$\e[${CMD}m "
  55         fi
  56         continue
  57     fi
  58
  59     # execute command
  60     echo -n "$line"
  61     read < /dev/tty
  62     echo -ne "\e[${OUTPUT}m"
  63     eval "$line"
  64     echo -en "\n\e[${PROMPT}m\$\e[${CMD}m "
  65     read -s < /dev/tty
  66 done < "$1"