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Björn Busse
Björn Busse
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05b375a14a
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Copyright © 2016, Björn Busse and contributors
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Björn Busse nor the
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names of contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY Björn Busse ''AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL Björn Busse BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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After Width: | Height: | Size: 18 KiB |
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#!/usr/bin/env rbash
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# xkcd_lock v1
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#
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# A wrapper around i3lock to display xkcd images on the lock screen
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#
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# Note that 'latest' needs an internet connection for the download!
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# If the download fails it falls back to a specific hard-coded image
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#
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# Builtin is a function to download all images.
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#
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# Dependencies: rbash, i3lock, xrandr, awk, curl
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#
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# © 2016 Björn Busse (see also: LICENSE)
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# bbusse@baerlin.eu
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#
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# Thanks to Randall Patrick Munroe! BTC 1FhCLQK2ZXtCUQDtG98p6fVH7S6mxAsEey
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# Thanks to Michael Stapelberg for an awesome window manager - i3
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#
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# TODO:
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# - make sure we do not exceed screen boundaries in x and y
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# - add tooltip overlay and xkcd number
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# - parallelize downloads
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[[ "$TRACE" ]] && set -x
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set -eo pipefail
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readonly SCRIPT_NAME=$(basename $0)
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# screensaver executable
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LOCK_BIN="i3lock"
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# verbosity
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VERBOSE=0
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# "latest" or "random"
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IMG_CHOICE="random"
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# path to images
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IMG_PATH="${HOME}/Pictures/xkcd_comics"
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# default / fallback image
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IMG_DEFAULT="not_really_into_pokemon.png"
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# background colour
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BG_COLOUR="white"
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DOWNLOAD_DISCLAIMER="\nThe downloaded images will end up in your current working directory.\n\
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Since we are using restricted bash, we can not change path.\n\
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Use '-y' instead of '-d' to really start the download to the current working directory.\n"
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log() {
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if (( 1=="${VERBOSE}" )); then
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echo "$@" >&2
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fi
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logger -p user.notice -t $SCRIPT_NAME "$@"
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}
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error() {
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echo "$@" >&2
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logger -p user.error -t $SCRIPT_NAME "$@"
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}
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# does not work with restricted bash (bash -r/rbash)
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get_script_path() {
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echo $(dirname $(readlink -f $0))
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}
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show_help() {
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printf "\n xkcd_lock v1\n\n\
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Available options are:\n\n \
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-d download images to current working directory\n \
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-h show this help\n \
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-i show specific image file - overrides '-m'\n \
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-l lock program: one of i3lock/swaylock\n \
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-m latest|random default: random\n \
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-v be verbose\n\n"
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}
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xkcd_get_latest_image() {
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if [[ -z $(which curl) ]]; then
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error "Could not find curl to get latest image"
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exit 1
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fi
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log "Looking for latest image"
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local img_url=$(curl -s http://xkcd.com/index.html | \
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awk '/Image URL \(for hotlinking\/embedding\): / {print $5}' | \
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awk 'BEGIN{FS="<";} {print $1}')
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if [[ -z $img_url ]]; then
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error "Can not download latest image, using fallback image"
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local img_fn="${IMG_DEFAULT}"
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else
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log "Downloading: $img_url"
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curl -sO --max-time 6 "$img_url"
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if [[ 0="$?" ]]; then
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local img_fn=$(echo "$img_url" | awk 'BEGIN{FS="/";} {print $5}')
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else
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error "Can not download latest image, using fallback image"
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local img_fn="${IMG_DEFAULT}"
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fi
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fi
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echo "$img_fn"
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}
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xkcd_get_img_name() {
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echo $(echo "$img_url_hotlink" | awk 'BEGIN{FS="/";} {print $5}')
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}
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xkcd_get_all_images() {
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VERBOSE="1"
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if [[ -z $(which curl) ]]; then
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error "Could not find curl to download images"
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exit 1
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fi
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log "Looking for latest image"
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local nimg_latest=$(curl -s http://xkcd.com/index.html | \
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awk '/Permanent link to this comic: / {print $6}' | \
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awk 'BEGIN{FS="/";} {print $4}')
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log "Found: $nimg_latest"
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for ((i=1; i<=$nimg_latest; i++)); do
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local img_url_hotlink=$(xkcd_get_hotlink_url $i)
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local img_name=$(xkcd_get_img_name $img_url_hotlink)
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if [[ -e "$img_name" ]]; then
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log "$img_name exists. Skipping download"
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continue
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fi
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log "Downloading ${i} ${img_url_hotlink} (${img_name})"
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local r=$(curl -sO $img_url_hotlink)
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log "Success: $r"
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done
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echo 0
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}
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xkcd_get_hotlink_url() {
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local url="http://xkcd.com/$i"
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local url_hotlink="$(curl -sL $url | awk '/Image URL \(for hotlinking\/embedding\): / {print $5}')"
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echo $url_hotlink
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}
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get_nscreens() {
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local nscreens=$(xrandr -q | awk '/ connected/ {count++} END {print count}')
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echo "$nscreens"
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}
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screen_get_smallest_resolution() {
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local res=$(xrandr -q | awk '/*/ {print $1}' \
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| awk 'BEGIN{FS="x";} NR==1 || $1<min {line=$0; min=$1}; END {print line}')
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echo "$res"
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}
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screen_get_highest_resolution() {
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local res=$(xrandr -q | awk '/*/ {print $1}' \
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| awk 'BEGIN{FS="x";} NR==1 || $1>max {line=$0; max=$1}; END {print line}')
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echo "$res"
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}
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get_random_image() {
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local img_fn="$(find $IMG_PATH -type f | shuf -n 1)"
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if ! [[ -e "$img_fn" ]]; then
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error "Could not find image to display"
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fi
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echo "$img_fn"
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}
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resize_image() {
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local tmp_file=$(mktemp)
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log "Resizing $img_fn to $res and saving image to $tmp_file"
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convert -adaptive-resize $res $img_fn $tmp_file
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if ! [[ -e "$tmp_file" ]]; then
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error "Could not find resized image"
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exit 1
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fi
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echo "$tmp_file"
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}
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center_image() {
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local tmp_file=$(mktemp)
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log "Centering $tmp_file and saving image to $tmp_file"
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convert $tmp_file_r -gravity center -background $BG_COLOUR -extent $res $tmp_file
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if ! [[ -e "$tmp_file" ]]; then
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error "Could not find centered image"
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exit 1
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fi
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echo "$tmp_file"
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}
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prepare_image() {
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local res=$(screen_get_highest_resolution)
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local tmp_file_r=$(resize_image $img_fn $res)
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local tmp_file_c=$(center_image $tmp_file_r $res)
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echo "$tmp_file_c"
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}
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screen_lock() {
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local img_fn_final=$(prepare_image $img_fn)
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log "Locking screen with $img_fn"
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$LOCK_BIN -i $img_fn_final
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}
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main() {
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local locker=$(which $LOCK_BIN)
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local OPTIND
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while getopts "h?i:l:vm:dy" opt; do
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case "$opt" in
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d)
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printf "%s${DOWNLOAD_DISCLAIMER}"
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printf "%s\nCurrent working directory: ${PWD}\n\n"
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exit 0
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;;
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h|\?)
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show_help
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exit 0
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;;
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i)
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local img_fn="${OPTARG}"
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local r=$(screen_lock $img_fn)
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exit 0
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;;
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l)
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if [[ "sway"="${OPTARG}" ]]; then
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LOCK_BIN="swaylock"
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fi
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;;
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m)
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IMG_CHOICE="${OPTARG}"
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;;
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v)
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VERBOSE=1
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;;
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y)
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r=$(xkcd_get_all_images)
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exit 0
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esac
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done
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if ! [[ -d "$IMG_PATH" ]]; then
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error "Image directory does not exist: $IMG_PATH"
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exit 1
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fi
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if [[ -z $(which xrandr) ]]; then
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error "Could not find xrandr to determine screen size"
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exit 1
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fi
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if [[ -z "$locker" ]]; then
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error "Could not find screen locker: $lock_bin"
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exit 1
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fi
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if [[ -z $(which convert) ]]; then
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error "Could not find $convert_bin \nYou need imagick"
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exit 1
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fi
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case "$IMG_CHOICE" in
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"latest") local img_fn=$(xkcd_get_latest_image);;
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"random") local img_fn=$(get_random_image);;
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esac
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screen_lock $img_fn
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}
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main "$@"
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