#!/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.


# ndf [options...] [files...]
#
# Nice DF runs `df` and displays its output using ANSI styles, so things are
# easier to scan/read. The options are the same as those for `df`.


case "$1" in
    -help|--help)
        {
            awk '/^# +ndf /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
            printf "\n\n"
            df --help
        } | less -MKiCRS --header=1
        exit 0
    ;;
esac

df "$@" |

# add empty lines to chunk things, restyle numbers with at least 4 digits
# to make them easier to read, and make 0s stand out
awk '
    (NR - 1) % 5 == 1 { print "" }

    {
        gsub(/[3-9][0-9]%/, "\x1b[38;2;204;124;0m&\x1b[0m")
        gsub(/[7-9][0-9]%/, "\x1b[38;2;204;0;0m&\x1b[0m")
        gsub(/ 0+%? /, "\x1b[38;2;0;105;185m&\x1b[0m")
        line = $0

        # restyle digit-runs which are longer than 3
        while (match(line, /[0-9]{4,}/)) {
            len = RLENGTH
            lead = len % 3
            alt = lead > 0

            printf "%s", substr(line, 1, RSTART + lead - 1)
            line = substr(line, RSTART + lead)
            len -= lead

            while (len > 0) {
                fs = (alt == 1) ? "\x1b[38;2;168;168;168m%s\x1b[0m" : "%s"
                printf fs, substr(line, 1, 3)

                alt = 1 - alt
                line = substr(line, 4)
                len -= 3
            }
        }

        printf "%s\n", line
    }
' |

less -MKiCRS --header=1