#!/bin/sh

# The MIT License (MIT)
#
# Copyright © 2020-2025 pacman64
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


# jsons [options...] [filenames...]
#
# JSON Strings turns TSV (tab-separated values) data into a JSON array of
# objects whose values are strings or nulls, the latter being used for
# missing trailing values.


case "$1" in
    -h|--h|-help|--help)
        awk '/^# +jsons /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
        exit 0
    ;;
esac

if [ $# -gt 1 ]; then
    printf "\e[31mmultiple inputs not allowed\e[0m\n" > /dev/stderr
    exit 1
fi


awk -F "\t" '
    function stringify(s) {
        gsub(/\\/, "\\\\", s)
        gsub(/"/, "\\\"", s)
        return sprintf("\"%s\"", s)
    }

    { gsub(/\r$/, "") }

    NR == 1 {
        key_count = NF
        for (i = 1; i <= NF; i++) {
            keys[i] = stringify($i)
        }
        next
    }

    NR == 2 { printf "[\n"; fflush() }
    NR > 2 { printf ",\n"; fflush() }

    {
        if (NF > key_count) {
            msg = "found row with more values than the keys/header"
            printf "\x1b[31m%s\x1b[0m\n", msg > "/dev/stderr"
            exit 1
        }

        printf "  {"
        for (i = 1; i <= NF; i++) {
            if (i > 1) printf ", "
            printf "%s: %s", keys[i], stringify($i)
        }
        for (i = NF + 1; i <= key_count; i++) {
            printf ", %s: null", keys[i]
        }
        printf "}"; fflush()
    }

    END {
        printf (NR <= 1) ? "[]\n" : "\n]\n"
    }
' "$@"