AnthonyA7

#!/bin/zsh
# ansi256 - shows a nicely formatted table of a selection of ANSI 256-colors
#----------------------------------------------------------------------------

FG='38;5;'   # foreground
BG='48;5;'   # background
INV='7m\e['
END='\e[0m'

NUMBLOCKS=7
NUMCOLS=6
NUMROWS=6
OFFSET=16

#----------------------------------------------------------------------------
# Arguments were implemented when figuring out how to display a nice table
# good arguments (actually, perfect arguments):
#   ansi256 7 6 6 15
#
#     NUMBLOCKS=$1
#     NUMCOLS=$2
#     NUMROWS=$3
#     OFFSET=$4

if [[ $1 == '' ]] ; then
    BEGIN=$FG
else
    if [[ $1 == "fg" ]] ; then
        BEGIN=$FG
    elif [[ $1 == "bg" ]] ; then
        BEGIN=$BG
    elif [[ $1 == "inv" ]] ; then
        BEGIN=$INV$FG
    else
        BEGIN=$1
    fi

fi


ROWMAX=$NUMROWS
COLMAX=$((NUMCOLS-1))
BLOCKMAX=$((NUMBLOCKS-1))
ABSMAX=255

if [[ $OFFSET -le $((NUMROWS*NUMCOLS)) ]] ; then
    for ROW in `seq 0 7` ; do
        for COL in `seq 0 3` ; do
            VAL=$(((COL*8)+ROW))
            VALFMT=$(printf '%03u' $VAL)
            ANSI="${BEGIN}${VAL}m"
            if [[ $VAL -lt $OFFSET ]] ; then
                echo -ne "\e[${ANSI}"
                echo -nE "${BEGIN}${VALFMT}m"
                echo -ne "${END}"
            else
                echo -nE "         "
            fi
            echo -nE "  "

        done
        echo -ne "\n"
    done
    echo -ne "\n\n"
fi

FINISHED=0

for BLOCK in `seq 0 $BLOCKMAX` ; do
    for ROW in `seq 1 $ROWMAX` ; do
        for COL in `seq 0 $COLMAX` ; do
            VAL=$(((COL*ROWMAX)+ROW+BLOCKADD+OFFSET-1))
            VALFMT=$(printf '%03u' $VAL)
            ANSI="${BEGIN}${VAL}m"
            if [[ $VAL -le $ABSMAX ]] ; then
                echo -ne "\e[${ANSI}"
                echo -nE "${BEGIN}${VALFMT}m"
                echo -ne "${END}"
            else
                echo -nE "         "
                FINISHED=1
            fi
            echo -nE "  "

        done
        echo -ne "\n"
    done
    BLOCKADD=$((VAL-OFFSET+1))
    if [[ $FINISHED -eq 1 ]] || [[ $VAL -ge $ABSMAX ]] ; then
        exit 0
    fi
    echo -ne "\n\n"
done