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85
.gitignore
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85
.gitignore
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# Created by https://www.gitignore.io/api/images,git
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# Edit at https://www.gitignore.io/?templates=images,git
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### Git ###
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# Created by git for backups. To disable backups in Git:
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# $ git config --global mergetool.keepBackup false
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*.orig
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# Created by git when using merge tools for conflicts
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*.BACKUP.*
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*.BASE.*
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*.LOCAL.*
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*.REMOTE.*
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*_BACKUP_*.txt
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*_BASE_*.txt
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*_LOCAL_*.txt
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*_REMOTE_*.txt
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### Images ###
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# JPEG
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*.jpg
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*.jpeg
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*.jpe
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*.jif
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*.jfif
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*.jfi
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# JPEG 2000
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*.jp2
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*.j2k
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*.jpf
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*.jpx
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*.jpm
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*.mj2
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# JPEG XR
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*.jxr
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*.hdp
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*.wdp
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# Graphics Interchange Format
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*.gif
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# RAW
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*.raw
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# Web P
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*.webp
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# Portable Network Graphics
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*.png
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# Animated Portable Network Graphics
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*.apng
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# Multiple-image Network Graphics
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*.mng
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# Tagged Image File Format
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*.tiff
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*.tif
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# Scalable Vector Graphics
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*.svg
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*.svgz
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# Portable Document Format
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*.pdf
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# X BitMap
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*.xbm
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# BMP
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*.bmp
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*.dib
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# ICO
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*.ico
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# 3D Images
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*.3dm
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*.max
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# End of https://www.gitignore.io/api/images,git
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160
url-diff.sh
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160
url-diff.sh
Executable file
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#!/usr/bin/env bash
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loc_storage="${HOME}/.config/url-diff";
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if [[ ! -z "${URLDIFF_STORAGE_DIR}" ]]; then loc_storage="${URLDIFF_STORAGE_DIR}"; fi
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loc_firefox_profile="${loc_storage}/firefox-profile";
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loc_prev_images="${loc_storage}/previous-images";
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highlight_colour="#ff000044";
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if [[ ! -z "${URLDIFF_HIGHLIGHT_COLOUR}" ]]; then highlight_colour="${URLDIFF_HIGHLIGHT_COLOUR}"; fi
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quiet="false";
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if [[ ! -z "${URLDIFF_QUIET}" ]]; then quiet="${URLDIFF_QUIET}"; fi
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window_width="${URLDIFF_WINDOW_WIDTH}";
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change_threshold="2";
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if [[ ! -z "${URLDIFF_CHANGE_THRESHOLD}" ]]; then change_threshold="${URLDIFF_CHANGE_THRESHOLD}"; fi
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###############################################################################
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log_msg() {
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if [[ "${quiet}" == "true" ]]; then
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return 0;
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fi
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echo "[${SECONDS}] $*";
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}
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# $1 Image to process
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# $2 Colour to find
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calculate_percentage_colour() {
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loc_image="${1}";
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colour="${2}";
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if [[ -z "${colour}" ]]; then
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log_msg "calculate_percentage_colour/Error: No colour specified." >&2;
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return 1;
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fi
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image_width="$(identify -format "%[fx:w]" "${loc_image}" )";
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image_height="$(identify -format "%[fx:h]" "${loc_image}")";
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pixel_count_colour="$(convert "${loc_image}" -fill black +opaque "${colour}" -fill white -opaque "${colour}" -format "%[fx:w*h*mean]" info:)";
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echo "(${pixel_count_colour} / (${image_width}*${image_height})) * 100" | bc -l
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}
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###############################################################################
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mode="${1}";
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shift;
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if [[ -z "${mode}" ]]; then
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echo -e "Webpage visual diff checker
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By Starbeamrainbowlabs
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Usage:
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webpage-diff {subcommand} [{arguments}]
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Subcommands:
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check {url} {output_diff_image} [{output_apng}]
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Checks the given URL for differences, and saves a diff image to a
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specified location. Exits with code 0 if differences are found, or code
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1 if no differences are found.
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Optionally generates an animated PNG that alternates between the 2 screenshots.
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Environment Variables:
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Variable Default variable
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----------------------------------------------------------------------
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URLDIFF_STORAGE_DIR ~/.config/url-diff
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The directory in which previous images are stored to diff against.
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The firefox profile is also stored in here.
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URLDIFF_HIGHLIGHT_COLOUR #ffffffcc
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The colour to highlight any changes in.
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URLDIFF_WINDOW_WIDTH
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The window width to tell firefox to screenshot with.
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URLDIFF_CHANGE_THRESHOLD 2
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The percentage of the screenshot that should have changed for it to count.
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Allows for ignoring random minor rendering artifacts.
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" >&2;
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fi
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# Create the config directories
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mkdir -p "${loc_firefox_profile}";
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mkdir -p "${loc_prev_images}";
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case "${mode}" in
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check )
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url="${1}";
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url_hash="$(echo "${url}" | sha256sum | cut -d ' ' -f 1)";
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loc_output_diffimage="${2}";
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loc_output_apng="${3}";
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tmpdir="$(mktemp -d)";
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on_exit() {
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rm -rf "${tmpdir}";
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}
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trap on_exit EXIT;
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loc_img_old="${loc_prev_images}/${url_hash}.png";
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loc_img_new="${tmpdir}/new.png";
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if [[ ! -d "$(dirname "${loc_output_diffimage}")" ]]; then
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echo "Error: Output directory for diff image does not exist";
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exit 2;
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fi
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log_msg "Taking screenshot";
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log_msg "$(firefox --window-size "${window_width}" --profile "${loc_firefox_profile}" --headless --screenshot "${loc_img_new}" "${url}" 2>&1)";
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if [[ ! -f "${loc_img_old}" ]]; then
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log_msg "No image exists yet, storing initial snapshot";
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mv "${loc_img_new}" "${loc_img_old}";
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exit 1;
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fi
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# eog "${loc_img_old}";
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# eog "${loc_img_new}";
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# img_hash_old="$(identify -quiet -format "%#" "${loc_img_old}")";
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# img_hash_new="$(identify -quiet -format "%#" "${loc_img_new}")";
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# Generate the diff image
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compare "${loc_img_old}" "${loc_img_new}" -compose src -highlight-color "${highlight_colour}" "${tmpdir}/diff.png";
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convert "${tmpdir}/diff.png" -transparent "#ffffffcc" "${tmpdir}/transp.png";
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# Work out how much of the image has changed
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percentage_changed="$(calculate_percentage_colour "${tmpdir}/transp.png" "${highlight_colour}")";
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log_msg "Changed: ${percentage_changed}%";
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# if [[ "${img_hash_new}" == "${img_hash_old}" ]]; then
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if [[ "$(echo "${percentage_changed} > ${change_threshold}" | bc -l)" -eq 0 ]]; then
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log_msg "No changes detected.";
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exit 1;
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fi
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log_msg "Changes detected, outputting diff image.";
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convert "${loc_img_new}" "${tmpdir}/transp.png" -compose over -composite "${loc_output_diffimage}";
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if which optipng >/dev/null 2>&1; then
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log_msg "Optimising new image";
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optipng "${loc_img_new}";
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fi
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if [[ ! -z "${loc_output_apng}" ]]; then
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log_msg "Making animated PNG";
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cp "${loc_img_old}" "${tmpdir}/0.png";
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cp "${loc_img_new}" "${tmpdir}/1.png";
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ffmpeg -hide_banner -r 1 -i "${tmpdir}/%d.png" -plays 0 "${loc_output_apng}";
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fi
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mv "${loc_img_new}" "${loc_img_old}";
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exit 0;
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;;
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esac
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