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#!/usr/bin/env nix
#! nix shell nixpkgs#optipng nixpkgs#jpegoptim nixpkgs#nodePackages.svgo nixpkgs#dash --command dash
# Back - An extremely simple git bug visualization system. Inspired by TVL's
# panettone.
#
# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# This file is part of Back.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/agpl.txt>.
# shellcheck shell=dash
# source: https://github.com/stride-tasks/stride/blob/148d513297c8ae66d79fc287769adfe5e711c93c/scripts/optimize-images
PROJECT_DIR="$(git rev-parse --show-toplevel)"
cd "$PROJECT_DIR" || {
echo "No '$PROJECT_DIR' ?!"
exit 1
}
PNG_OPITMIZE_COMMAND='optipng --quiet -o7 -preserve'
JPG_OPITMIZE_COMMAND='jpegoptim --quiet --strip-all -m76'
SVG_OPITMIZE_COMMAND='svgo --multipass --quiet --input'
# The extension is the part after the first dot in the filename:
#
# For example:
# file.png => png
# file.tar.gz => tar.gz
find_files_by_extension() {
wanted_extension="$1"
tmp="$(mktemp)"
git ls-files --cached --modified --other --exclude-standard --deduplicate | while IFS= read -r file; do
file_basename="$(basename "$file")"
extension="${file_basename#*.}"
if [ "$extension" = "$wanted_extension" ]; then
echo "$file"
else
:
# echo "'$file' with extension: '$extension' does not match filter: '$wanted_extension'" 1>&2
fi
done >"$tmp"
echo "$tmp"
}
size_of() {
du -b "$1" | cut -f1
}
bytes_human() {
number="$1"
numfmt --to=iec-i --suffix=B --format="%9.2f" "$number"
}
# https://stackoverflow.com/questions/44695878/how-to-calculate-percentage-in-shell-script
# Native POSIX solution using string manipulation (assumes integer inputs).
percent() {
DP="$1"
SDC="$2"
# Special case when DP is zero.
[ "$DP" = "0" ] && echo "0.00" && return
# # e.g. round down e.g. round up
# # DP=1 SDC=3 DP=2 SDC=3
Percent=$((DP * 100000 / SDC + 5)) # Percent=33338 Percent=66671
Whole=${Percent%???} # Whole=33 Whole=66
Percent=${Percent#"$Whole"} # Percent=338 Percent=671
Percent=$Whole.${Percent%?} # Percent=33.33 Percent=66.67
echo "$Percent"
}
TOTAL=0
TOTAL_SAVED=0
optimize_files() {
FILTER="$1"
PROGRAM="$2"
printf "%s" "Processing $FILTER files:"
FILES="$(find_files_by_extension "$FILTER")"
COUNT=$(wc -l <"$FILES")
if [ "$COUNT" -eq 0 ]; then
echo " no files found!"
return
fi
echo ""
I=1
TOTAL_INNER=0
TOTAL_SAVED_INNER=0
while IFS= read -r f; do
printf "%s/${COUNT} $f ... " "$I"
SIZE="$(size_of "$f")"
$PROGRAM "$f"
NEW_SIZE="$(size_of "$f")"
DIFF=$((SIZE - NEW_SIZE))
echo "saved: $(bytes_human "$DIFF") ($(percent $DIFF "$SIZE")%)"
TOTAL_INNER=$((TOTAL_INNER + SIZE))
TOTAL_SAVED_INNER=$((TOTAL_SAVED_INNER + DIFF))
I=$((I + 1))
done <"$FILES"
rm "$FILES"
echo "Total saved for $FILTER: $(bytes_human "$TOTAL_SAVED_INNER") ($(percent $TOTAL_SAVED_INNER $TOTAL_INNER)%)"
echo ""
TOTAL=$((TOTAL + TOTAL_INNER))
TOTAL_SAVED=$((TOTAL_SAVED + TOTAL_SAVED_INNER))
}
optimize_files 'png' "$PNG_OPITMIZE_COMMAND"
optimize_files 'jpg' "$JPG_OPITMIZE_COMMAND"
optimize_files 'jpeg' "$JPG_OPITMIZE_COMMAND"
optimize_files 'svg' "$SVG_OPITMIZE_COMMAND"
echo "Total saved: $(bytes_human "$TOTAL_SAVED") ($(percent $TOTAL_SAVED $TOTAL)%)"
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