v-barplot

#!/bin/bash
# statistical: gernerate easy statistical informations in bash
# Copyright: (C) 2011 Florian Baumann <flo@noqqe.de>
# License: GPL-3 <http://www.gnu.org/licenses/gpl-3.0.txt>
# Date: Tuesday 2011-04-12

### Locales 
SUM="$*"        # see all key value pairs
OUTPUTCHAR='#'  # configure this to your favorite ascii char 
BORDERCHAR='|'  # configure this to your favorite ascii char 
BOTTOMCHAR='='

# Read from stdin hack
if [ -z "$*" ]; then
    SUM=$(cat /dev/stdin)
fi
    
### Scaling and environment analysis for optimal output on 
# the most terminals 
for data in $SUM; do

    # Getting informations from parameters
    KEY=${data%%:*}
    VALUE=${data##*:}

    # Fishing errors from wrong usage
    if [[ ! $VALUE =~ ^[[:digit:]]+$ ]]; then
        echo "ERROR: Do not use characters as value! Key:$KEY Value:$VALUE"
        exit 1
    fi

    # Bash couldn't handle values with more than 19 numbers
    # Values longer than 19 will be transformed into strings.
    # String could not be graphed :) 
    if [[ ${#VALUE} -gt 19 ]]; then 
        echo "Error: Bash couldn't handle values with more than 19 numbers. Sorry."
        exit 1
    fi

    # Fishing the biggest value 
    (( VALUE > MAXVALUE )) && MAXVALUE=$VALUE

done

# Scaling action
FACTORCOUNT=0
if [ ${MAXVALUE:0:1} -gt 7 ] && [ ${#MAXVALUE} -gt 1 ]; then
    FACTOR=3
elif [ ${MAXVALUE:0:1} -gt 2 ] && [ ${#MAXVALUE} -gt 1 ]; then
    FACTOR=2
else
    FACTOR=1
fi
while [ ${FACTORCOUNT} -lt $(( ${#MAXVALUE} - 2 )) ]; do
    FACTOR="${FACTOR}0"
    ((FACTORCOUNT++))
done

# Start graphing
COUNTER="$(($MAXVALUE / $FACTOR))"
while [ $COUNTER -gt 0 ]; do

    # Print (scaled) number and limiter
    SIGNC=$(($COUNTER * $FACTOR))
    while [ ${#SIGNC} -lt ${#MAXVALUE} ]; do
        SIGNC=" $SIGNC"
    done
    echo -n "$SIGNC $BORDERCHAR"

    # Looping all data sets for each Step (downwards)
    for data in $SUM ; do 
        
        # Parsing data
        KEY=${data%%:*}
        VALUE=${data##*:}
        VALUE=$(($VALUE / $FACTOR))

        # If number equal or less the actual counter print a char
        if [ $COUNTER -le $VALUE ]; then
            echo -n "${OUTPUTCHAR}${OUTPUTCHAR}${OUTPUTCHAR} "
        else    
            echo -n "    "
        fi

    done

    # Round ends, do next (scaled) round
    ((COUNTER--))
    echo

    # Bulding bottom lines
    if [ $COUNTER -le 0 ]; then

        # Bottom of Graph
        SPACEC=0
        while [ $SPACEC -le ${#MAXVALUE} ]; do
            echo -n " "
            ((SPACEC++))
        done
        echo -n "$BORDERCHAR"
        for name in $SUM; do 
            echo -n "${BOTTOMCHAR}${BOTTOMCHAR}${BOTTOMCHAR}${BOTTOMCHAR}"
        done
        echo 

        # Key names
        SPACEC=0
        while [ $SPACEC -le ${#MAXVALUE} ]; do
            echo -n " "
            ((SPACEC++))
        done
        echo -n " "
        for name in $SUM; do
            KEY=${name%%:*}

            if [ ${#KEY} -ge 4 ]; then 
                KEY=${KEY:0:3}
            fi
            # Do key scaling action for terminal
            if [ ${#KEY} -ge 4 ]; then 
                KEY=${KEY:0:3}
            elif [ ${#KEY} -eq 2 ]; then
                echo -n "$KEY  "
            elif [ ${#KEY} -eq 1 ]; then
                echo -n "$KEY   "
            else
                echo -n "$KEY "
            fi
        done
        echo 
    fi
done