#!/bin/sh -ef
# Show the size on disk for a package

get_size() {
    # Naive function to convert bytes to human readable
    # sizes (MB, KB, etc). This is probably wrong in places
    # though we can fix this over time. It's a start.
    case ${#1} in
        [0-3]) hum=$(($1))KB ;;
        [4-6]) hum=$(($1 / 1024))MB ;;
        [7-9]) hum=$(($1 / 1024 / 1024))GB ;;
        *)     hum=$(($1))  ;;
    esac

    printf '%s\t%s\n' "$hum" "$2"
}

# Use the current directory as the package name if no package is given.
[ "$1" ] || set -- "${PWD##*/}"

# Ignore shellcheck as we want the warning's behavior.
# shellcheck disable=2015
kiss list "${1:-null}" >/dev/null || {
    printf 'usage: kiss-size [pkg]\n'
    exit 1
}

# Filter directories from manifest and leave only files.
# Directories in the manifest end in a trailing '/'.
# Send the file list to 'xargs' to run through 'du',
# this prevents du from exiting due to too many arguments
sed -e "s|^|$KISS_ROOT|" -e 's|.*/$||' \
    "$KISS_ROOT/var/db/kiss/installed/$1/manifest" \
    | xargs du -sk -- 2>/dev/null |

# Iterate over each line and convert the byte output to human
# readable (MB, KB, GB, etc).
while read -r size file || {
    get_size "$tot" total >&2
    break
} do
    get_size "$size" "$file"
    tot=$((tot + size))
done