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HTML Grapher in Bash- A bash (awk et al) script for graphing two columns to HTML/CSS 


#!/bin/sh
#
# * Copyright (c) 2008
# *     Adam Keck.  All rights reserved.
# *
# * Redistribution and use in source and binary forms, with or without
# * modification, are permitted provided that the following conditions
# * are met:
# * 1. Redistributions of source code must retain the above copyright
# *    notice, this list of conditions and the following disclaimer.
# * 2. Redistributions in binary form must reproduce the above copyright
# *    notice, this list of conditions and the following disclaimer in the
# *    documentation and/or other materials provided with the distribution.
# * 3. The name Adam Keck may not be used to endorse or promote products derived from this software
# *    without specific prior written permission.
# *
# * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# * SUCH DAMAGE.

#Print Usage

usage () {
  echo "$0 {-h|-help} {-f |--file=2-column-ACSII-csv-file -o|--outfile=HTML-output-file -c|--colors=comma-separated-list-of-css-colors -bg|--background-color=css-backgroundcolor }"
  }

# Make sure file exists and is ASCII

validatefile () {

  if [ -z $1 ]
  then
    usage
    return 1
  fi

  if [ -f $1 ]
  then
    if [ "`file $1| awk '{print $2}'`" = "ASCII" ]
    then
      return 0
    else
      echo "File is not ASCII text." 2>&1
      return 1
    fi
  else
    echo "File does not exist." 2>&1
    return 1
  fi
}

# Get the height of the whole graph by getting the maximum value of column two after stripping out non-numeric characters

graphheight () {
  FILE=$1
  echo "`awk -F, '{gsub("[^0-9]", "", $2);if($2>a)a=$2}END{print a}' $FILE` * 10 + 30 " | bc
}

# Look up the color from the list of CSS colors supplied on the command line

lookupcolor () {
  COLORNUMBER=$1
  echo $COLORNUMBER,$2 | awk -F, '{print $($1+1)}'
}


# Process arguments

# If no arguments have been specified on the command line then print the usage

if [ $# = 0 ]
then
  usage
  exit 1
fi

# Loop through the arguments setting variables used the script.

while [ $# -gt 0 ] ; do

    case "$1" in
      -f|--file=*)
        if [ "$1" = "-f" ] ; then
          shift
            if validatefile $1
            then
              INPUTFILE=$1
            else
              exit 1
            fi
        else
          FILEHOLDER="`echo $1 | sed s,--file=,,`"
          if validatefile $1
          then
            INPUTFILE=$FILEHOLDER
          else
            exit 1
          fi
        fi
    ;;
      -o|--outfile=*)
        if [ "$1" = "-o" ] ; then
          shift
              GRAPHFILE=$1
        else
          GRAPHFILE="`echo $1 | sed s,--outfile=,,`"
        fi
    ;;
      -c|--colors=*)
        if [ "$1" = "-c" ] ; then
          shift
              COLORS=$1
        else
          COLORS="`echo $1 | sed s#--colors=##`"
        fi
    ;;
      -bg|--background-color=*)
        if [ "$1" = "-bg" ] ; then
          shift
              BGCOLOR=$1
        else
          BGCOLOR="`echo $1 | sed s,--background-color,,`"
        fi
    ;;
      -h|-help)
      usage
      exit 0
    ;;
    *)
      usage
      exit 1
    ;;
    esac

   shift

done

# Set some reasonable default colors in case they were not
# specified on the command line.

if [ -z $COLORS ]
then
  COLORS=black
fi

if [ -z $BGCOLOR ]
then
  BGCOLOR=lightgrey
fi


# Write out the HTML header

echo "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"
        \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">
        <html xmlns=\"http://www.w3.org/1999/xhtml\">
        <head> <meta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\" /> <title>`echo $INPUTFILE | awk -F. '{print $1}'`</title>" > $GRAPHFILE


# Generate graph

# First, get the number of columns

WIDTH=`cat $INPUTFILE | wc -l `

# write the global CSS

echo "
<style>
    h2 {
        line-height: 1.5em;
        font-family: sans-serif;
        font-weight: normal;
    }

    #vertgraph {
        width: `echo "${WIDTH}*55" | bc`px;
        height: `graphheight $INPUTFILE`px;
        position: relative;
        background: $BGCOLOR;
    }
    #vertgraph ul {
        width: `echo "${WIDTH}*65" | bc`px;
        height: 200px;
        margin: 0;
        padding: 0;
    }
    #vertgraph ul li {
        position: absolute;
        width: 45px;
        bottom: 20px;
        padding: 0 !important;
        margin: 0 !important;
        text-align: center;
        font-weight: normal;
        font-size: 9px;
        color: white;
        line-height: 2.5em;
        list-style-type: none;
        font-family: sans-serif;
    }

" >> $GRAPHFILE

echo "
</style>
" >> $GRAPHFILE

echo "</head>    <body>" >> $GRAPHFILE

echo "<h2>`echo $INPUTFILE | awk -F. '{print $1}'`</h2>" >> $GRAPHFILE

# Write the graph div

echo "

<div id=\"vertgraph\">
    <ul>
    " >>  $GRAPHFILE

# Initialize the line counter and the position of the first color in
# color list.

LINENUMBER=0
COLORNUMBER=1

# Loop through file creating list elements

cat $INPUTFILE | while read LINE
do

# Remove non-numeric characters from the column two value of each line.
# If no characters remain, set the raw height to .1 so that in the
# creation of the list element for the column, the column will get 1 pixel
# for height

  HEIGHTRAW=`echo $LINE | awk -F, '{gsub("[^0-9]", "", $2);print $2}'`
  if [ -z $HEIGHTRAW ]
    then
    HEIGHTRAW=".1"
  fi

# Check the color number, i.e. the position in the color list
# from the command line. If it's more than the number of colors
# in the list, reset it to one.

  if [ $COLORNUMBER -gt `echo $COLORS | awk -F, '{print NF}'` ]
  then
    COLORNUMBER=1
  fi

# Get the color from the list of colors corresponding to the position in
# the list specified by the value of color number.

  COLOR=`lookupcolor $COLORNUMBER $COLORS`

# Write the list element corresponding to the line we are processing in the
# input file.  The height of the column will be the second column times 10
# pixels.  Each column is placed to right of the last one by 55 pixels.
# The header for the column is the value of the first column.
# The column one value is stripped of all non-alpha numberic characters.

  echo "<li style=\"height: `echo "$HEIGHTRAW * 10" | bc`px ; left: `echo "(${LINENUMBER}*50) + 5" | bc`px; background-color: $COLOR;\" >`echo $LINE|awk -F, '{print $1}'|sed 's/\W//g'`</li> " >> $GRAPHFILE

# Increment the counters

  LINENUMBER=`expr ${LINENUMBER} + 1`
  COLORNUMBER=`expr ${COLORNUMBER} + 1`

done

# Close out the list,div, and HTML code

echo "
    </ul>
</div>
    " >> $GRAPHFILE

echo "</body> </html>" >> $GRAPHFILE



====================================================

That is, for

A,4
B,5
C,3
D,5

generate a bar graph using only CSS and HTML.

Javascript would have been more useful, but this is a bash blog. If you need javascript, this is "BSD" licensed, so have at it :-).



Cheers,

-Adam
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