gzipped-size

#!/bin/bash
#
# Print statistics on gzipped vs uncompressed size of files
#
# Example:
#    $ cat dotfiles-install.gif | gzipped-size  .gitattributes - README.md 
#    .gitattributes  : 560 bytes (versus 973 bytes)
#    stdin           : 312712 bytes (versus 329123 bytes)
#    README.md       : 682 bytes (versus 1184 bytes)

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source $DIR/cross-platform-utils.bashlib

FILES="$@"
MAX_NAME_SZ="$(for f in "$FILES"; do echo $f|wc -c; done | sort -n | tail -1)"

handle_stdin(){
    local tmp=$(mktemp)
    local gz_sz="$(tee $tmp | gzip -c - | wc -c)"
    local sz="$(wc -c $tmp)"
    print_stats "stdin" $tmp
}

print_stats(){
    local name="$1"
    local file="$2"
    printf "%-${MAX_NAME_SZ}s : %s bytes (versus %s bytes)\n"  "$name" "$(gzip -c $file | wc -c)" "$(util.size $file)"
}

if [[ -z $FILES ]]; then
    handle_stdin
    exit
fi

for f in $@; do 
    if [[ $f == "-" ]]; then
        handle_stdin
    else
        print_stats "$f" "$f"
    fi
done

# vim: set ft=sh