djcev.com

#!/bin/sh
#
#  Copyright (c) 2022, Cameron Vanderzanden. Available under the
#  terms of the 2-clause BSD license. Please see the file "LICENSE" in
#  the root dir of this repository for more information.
#
#- get_rss.sh 2022/02/05 cev.
## Usage: get_rss.sh [-hxV] [-d directory] [-n name] <URL...>
## 
##     Retrieve a remote RSS feed using fetch(1)'s if-modified mode,
##     store the result in a cache directory (default ~/.cache/rss).
## 
##       -d     Output directory; write to the specified directory.
##       -h     Show help.
##       -n     Feed name; don't include any extensions (.xml, for instance).
##       -x     Don't refresh feed if screensaver is running.
##       -V     Print version info.
## 
#

[ -x $HOME/.local/bin/cev_print.sh ] && . $HOME/.local/bin/cev_print.sh

self="${0##*'/'}"

RSSCACHEDIR="$HOME/.cache/rss"
screensaver=""

while getopts "d:hn:xV?" option; do
    case $option in
        d) RSSCACHEDIR="$OPTARG" ;;
        h) print_help && exit ;;
        n) name="$OPTARG" ;;
        x) screensaver="YES" ;;
        V) print_version && exit ;;
        "?") print_help && exit ;;
    esac
    shift $((OPTIND - 1))
done

if [ -z "$name" ]; then
    printf "TODO"
    exit 1
fi

# check if xscreensaver has blanked or locked the screen.
if [ ! -z "$screensaver" ]; then
    # this is run from cron; set DISPLAY so xscreensaver-command will be quiet
    # TODO should do this differently.
    DISPLAY=":0.0"
    export DISPLAY
    xs="$(xscreensaver-command -time | grep -E ' blanked| locked')"
    [ ! -z "$xs" ] && exit 0
fi

url="$@"
file="${RSSCACHEDIR}/${name}.xml"

# TODO: add error checking, error messages, proper exit status
if [ ! -f "$file" ]; then
    /usr/bin/nice -n 10 fetch -o "$file" "$url" 1>/dev/null 2>&1
else
    /usr/bin/nice -n 10 fetch -i "$file" -o "$file" "$url" 1>/dev/null 2>&1
fi