34.5. "Colorizing" Scripts

   1 #!/bin/bash
   2 # ex30a.sh: "Colorized" version of ex30.sh.
   3 #            Crude address database
   4 
   5 
   6 clear                                   # Clear the screen.
   7 
   8 echo -n "          "
   9 echo -e '\E[37;44m'"\033[1mContact List\033[0m"
  10                                         # White on blue background
  11 echo; echo
  12 echo -e "\033[1mChoose one of the following persons:\033[0m"
  13                                         # Bold
  14 tput sgr0
  15 echo "(Enter only the first letter of name.)"
  16 echo
  17 echo -en '\E[47;34m'"\033[1mE\033[0m"   # Blue
  18 tput sgr0                               # Reset colors to "normal."
  19 echo "vans, Roland"                     # "[E]vans, Roland"
  20 echo -en '\E[47;35m'"\033[1mJ\033[0m"   # Magenta
  21 tput sgr0
  22 echo "ones, Mildred"
  23 echo -en '\E[47;32m'"\033[1mS\033[0m"   # Green
  24 tput sgr0
  25 echo "mith, Julie"
  26 echo -en '\E[47;31m'"\033[1mZ\033[0m"   # Red
  27 tput sgr0
  28 echo "ane, Morris"
  29 echo
  30 
  31 read person
  32 
  33 case "$person" in
  34 # Note variable is quoted.
  35 
  36   "E" | "e" )
  37   # Accept upper or lowercase input.
  38   echo
  39   echo "Roland Evans"
  40   echo "4321 Floppy Dr."
  41   echo "Hardscrabble, CO 80753"
  42   echo "(303) 734-9874"
  43   echo "(303) 734-9892 fax"
  44   echo "revans@zzy.net"
  45   echo "Business partner & old friend"
  46   ;;
  47 
  48   "J" | "j" )
  49   echo
  50   echo "Mildred Jones"
  51   echo "249 E. 7th St., Apt. 19"
  52   echo "New York, NY 10009"
  53   echo "(212) 533-2814"
  54   echo "(212) 533-9972 fax"
  55   echo "milliej@loisaida.com"
  56   echo "Girlfriend"
  57   echo "Birthday: Feb. 11"
  58   ;;
  59 
  60 # Add info for Smith & Zane later.
  61 
  62           * )
  63    # Default option.	  
  64    # Empty input (hitting RETURN) fits here, too.
  65    echo
  66    echo "Not yet in database."
  67   ;;
  68 
  69 esac
  70 
  71 tput sgr0                               # Reset colors to "normal."
  72 
  73 echo
  74 
  75 exit 0

   1 #!/bin/bash
   2 # Draw-box.sh: Drawing a box using ASCII characters.
   3 
   4 # Script by Stefano Palmeri, with minor editing by document author.
   5 # Used in the "ABS Guide" with permission.
   6 
   7 
   8 ######################################################################
   9 ###  draw_box function doc  ###
  10 
  11 #  The "draw_box" function lets the user
  12 #+ draw a box into a terminal.       
  13 #
  14 #  Usage: draw_box ROW COLUMN HEIGHT WIDTH [COLOR] 
  15 #  ROW and COLUMN represent the position        
  16 #+ of the upper left angle of the box you're going to draw.
  17 #  ROW and COLUMN must be greater than 0
  18 #+ and less than current terminal dimension.
  19 #  HEIGHT is the number of rows of the box, and must be > 0. 
  20 #  HEIGHT + ROW must be <= than current terminal height. 
  21 #  WIDTH is the number of columns of the box and must be > 0.
  22 #  WIDTH + COLUMN must be <= than current terminal width.
  23 #
  24 # E.g.: If your terminal dimension is 20x80,
  25 #  draw_box 2 3 10 45 is good
  26 #  draw_box 2 3 19 45 has bad HEIGHT value (19+2 > 20)
  27 #  draw_box 2 3 18 78 has bad WIDTH value (78+3 > 80)
  28 #
  29 #  COLOR is the color of the box frame.
  30 #  This is the 5th argument and is optional.
  31 #  0=black 1=red 2=green 3=tan 4=blue 5=purple 6=cyan 7=white.
  32 #  If you pass the function bad arguments,
  33 #+ it will just exit with code 65,
  34 #+ and no messages will be printed on stderr.
  35 #
  36 #  Clear the terminal before you start to draw a box.
  37 #  The clear command is not contained within the function.
  38 #  This allows the user to draw multiple boxes, even overlapping ones.
  39 
  40 ###  end of draw_box function doc  ### 
  41 ######################################################################
  42 
  43 draw_box(){
  44 
  45 #=============#
  46 HORZ="-"
  47 VERT="|"
  48 CORNER_CHAR="+"
  49 
  50 MINARGS=4
  51 E_BADARGS=65
  52 #=============#
  53 
  54 
  55 if [ $# -lt "$MINARGS" ]; then                 # If args are less than 4, exit.
  56     exit $E_BADARGS
  57 fi
  58 
  59 # Looking for non digit chars in arguments.
  60 # Probably it could be done better (exercise for the reader?).
  61 if echo $@ | tr -d [:blank:] | tr -d [:digit:] | grep . &> /dev/null; then
  62    exit $E_BADARGS
  63 fi
  64 
  65 BOX_HEIGHT=`expr $3 - 1`   #  -1 correction needed because angle char "+" is 
  66 BOX_WIDTH=`expr $4 - 1`    #+ a part of both box height and width.
  67 T_ROWS=`tput lines`        #  Define current terminal dimension 
  68 T_COLS=`tput cols`         #+ in rows and columns.
  69          
  70 if [ $1 -lt 1 ] || [ $1 -gt $T_ROWS ]; then    #  Start checking if arguments
  71    exit $E_BADARGS                             #+ are correct.
  72 fi
  73 if [ $2 -lt 1 ] || [ $2 -gt $T_COLS ]; then
  74    exit $E_BADARGS
  75 fi
  76 if [ `expr $1 + $BOX_HEIGHT + 1` -gt $T_ROWS ]; then
  77    exit $E_BADARGS
  78 fi
  79 if [ `expr $2 + $BOX_WIDTH + 1` -gt $T_COLS ]; then
  80    exit $E_BADARGS
  81 fi
  82 if [ $3 -lt 1 ] || [ $4 -lt 1 ]; then
  83    exit $E_BADARGS
  84 fi                                 # End checking arguments.
  85 
  86 plot_char(){                       # Function within a function.
  87    echo -e "\E[${1};${2}H"$3
  88 }
  89 
  90 echo -ne "\E[3${5}m"               # Set box frame color, if defined.
  91 
  92 # start drawing the box
  93 
  94 count=1                                         #  Draw vertical lines using
  95 for (( r=$1; count<=$BOX_HEIGHT; r++)); do      #+ plot_char function.
  96   plot_char $r $2 $VERT
  97   let count=count+1
  98 done 
  99 
 100 count=1
 101 c=`expr $2 + $BOX_WIDTH`
 102 for (( r=$1; count<=$BOX_HEIGHT; r++)); do
 103   plot_char $r $c $VERT
 104   let count=count+1
 105 done 
 106 
 107 count=1                                        #  Draw horizontal lines using
 108 for (( c=$2; count<=$BOX_WIDTH; c++)); do      #+ plot_char function.
 109   plot_char $1 $c $HORZ
 110   let count=count+1
 111 done 
 112 
 113 count=1
 114 r=`expr $1 + $BOX_HEIGHT`
 115 for (( c=$2; count<=$BOX_WIDTH; c++)); do
 116   plot_char $r $c $HORZ
 117   let count=count+1
 118 done 
 119 
 120 plot_char $1 $2 $CORNER_CHAR                   # Draw box angles.
 121 plot_char $1 `expr $2 + $BOX_WIDTH` +
 122 plot_char `expr $1 + $BOX_HEIGHT` $2 +
 123 plot_char `expr $1 + $BOX_HEIGHT` `expr $2 + $BOX_WIDTH` +
 124 
 125 echo -ne "\E[0m"             #  Restore old colors.
 126 
 127 P_ROWS=`expr $T_ROWS - 1`    #  Put the prompt at bottom of the terminal.
 128 
 129 echo -e "\E[${P_ROWS};1H"
 130 }      
 131 
 132 
 133 # Now, let's try drawing a box.
 134 clear                       # Clear the terminal.
 135 R=2      # Row
 136 C=3      # Column
 137 H=10     # Height
 138 W=45     # Width 
 139 col=1    # Color (red)
 140 draw_box $R $C $H $W $col   # Draw the box.
 141 
 142 exit 0
 143 
 144 # Exercise:
 145 # --------
 146 # Add the option of printing text within the drawn box.

   1 #!/bin/bash
   2 # color-echo.sh: Echoing text messages in color.
   3 
   4 # Modify this script for your own purposes.
   5 # It's easier than hand-coding color.
   6 
   7 black='\E[30;47m'
   8 red='\E[31;47m'
   9 green='\E[32;47m'
  10 yellow='\E[33;47m'
  11 blue='\E[34;47m'
  12 magenta='\E[35;47m'
  13 cyan='\E[36;47m'
  14 white='\E[37;47m'
  15 
  16 
  17 alias Reset="tput sgr0"      #  Reset text attributes to normal
  18                              #+ without clearing screen.
  19 
  20 
  21 cecho ()                     # Color-echo.
  22                              # Argument $1 = message
  23                              # Argument $2 = color
  24 {
  25 local default_msg="No message passed."
  26                              # Doesn't really need to be a local variable.
  27 
  28 message=${1:-$default_msg}   # Defaults to default message.
  29 color=${2:-$black}           # Defaults to black, if not specified.
  30 
  31   echo -e "$color"
  32   echo "$message"
  33   Reset                      # Reset to normal.
  34 
  35   return
  36 }  
  37 
  38 
  39 # Now, let's try it out.
  40 # ----------------------------------------------------
  41 cecho "Feeling blue..." $blue
  42 cecho "Magenta looks more like purple." $magenta
  43 cecho "Green with envy." $green
  44 cecho "Seeing red?" $red
  45 cecho "Cyan, more familiarly known as aqua." $cyan
  46 cecho "No color passed (defaults to black)."
  47        # Missing $color argument.
  48 cecho "\"Empty\" color passed (defaults to black)." ""
  49        # Empty $color argument.
  50 cecho
  51        # Missing $message and $color arguments.
  52 cecho "" ""
  53        # Empty $message and $color arguments.
  54 # ----------------------------------------------------
  55 
  56 echo
  57 
  58 exit 0
  59 
  60 # Exercises:
  61 # ---------
  62 # 1) Add the "bold" attribute to the 'cecho ()' function.
  63 # 2) Add options for colored backgrounds.