bosskey

#!/bin/bash
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Copyright 2021 Jeremy Brubaker <jbru362@gmail.com>
#
# abstract: "install" packages forever
#
# Requires dialog(1) for the output and dnf(1) to get a list of packages
#

### Configurable settings {{{1
#
PERCENT_DELTA_START=10
PERCENT_DELTA=5
PERCENT_DELTA_MIN=1
TIME_MS_MIN=25
TIME_MS_MAX=100
BOX_LINES=6
BOX_COLS=65 # This should be fairly large to keep package names visible
### End configurable settings

PROGNAME=$(basename "$0")

random()
{
    awk -v min="$1" -v max="$2" 'BEGIN{srand(); print int(min+rand()*(max-min+1))}'
}

get_pkg_name() { # {{{1
    # Get a random letter
    c=$(random 97 122) # 97-122: lowercase letter range
    c=$(printf \\$(printf '%03o' $c))

    # Get a random package name that starts with that letter
    dnf list 2>/dev/null \
        | grep -E "^$c" \
        | awk '{print $1}' | shuf -n1
}

# Main {{{1
#
check_command()
{
    if ! command -v $1 >/dev/null; then
        return 1
    fi
}

if !  check_command dialog; then
    printf "Missing dialog(1). Exiting\n" >&2
    exit 1
fi

if !  check_command dnf; then
    printf "Missing dnf(1). Exiting\n" >&2
    exit 1
fi

TMPFILE=$(mktemp "$(basename "$0").XXXXXX")
trap 'clear; rm -f "$TMPFILE"' EXIT

exec 3<>"$TMPFILE"
rm "$TMPFILE"

part=1
pkg="Preparing..."
while true; do
    # Get the next package name in the background
    get_pkg_name >/dev/fd/3 &

    i=0
    delta=$PERCENT_DELTA_START
    while test $i -lt 100; do
        # Send new % complete to output
        echo $i

        # Increase % by last change +/- PERCENT_DELTA%
        delta=$(random $((delta-PERCENT_DELTA)) $((delta+PERCENT_DELTA)))
        test "$delta" -lt "$PERCENT_DELTA_MIN" && delta="$PERCENT_DELTA_MIN"
        i=$(( i+delta ))

        # Delay a random time
        time=$(random $TIME_MS_MIN $TIME_MS_MAX)
        sleep $((TIME_MS_MAX / time));
    done | dialog --gauge "$pkg" $BOX_LINES $BOX_COLS;

    # Block for a new package name
    IFS= read -r pkg </dev/fd/3
    pkg="Install part $part : $pkg"
    part=$(( part+1 ))
done