script to reduce the image size
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Ludger Sicking
parent
163f3585a9
commit
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#!/usr/bin/env bash
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# Resize/convert all png|PNG|jpeg|jpg|JPG images under content/ to .jpg,
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# long edge <= MAX_DIM px, file size <= MAX_BYTES, in place.
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# Exception: PNGs already under PNG_KEEP_MAX_DIM px and PNG_KEEP_MAX_BYTES
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# bytes are left as PNG, untouched.
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# Updates filename references in content/**/*.md when a file gets renamed.
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#
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# Usage: scripts/resize-and-convert-images.sh [content-dir] --apply
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# scripts/resize-and-convert-images.sh [content-dir] (dry run, default)
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#
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# SAFETY: this script defaults to a dry run and changes NOTHING unless you
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# pass --apply explicitly. Unknown arguments are a hard error, not silently
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# ignored, so a typo can never turn a dry run into a real run.
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set -uo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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CONTENT_DIR="$SCRIPT_DIR/../content"
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MAX_DIM=1600
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MAX_BYTES=307200 # 300 KiB
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PNG_KEEP_MAX_DIM=1600
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PNG_KEEP_MAX_BYTES=204800 # 200 KiB
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DRY_RUN=1
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CONTENT_DIR_SET=0
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usage() {
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echo "Usage: $0 [content-dir] --apply" >&2
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echo " $0 [content-dir] # dry run (default, no changes written)" >&2
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}
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for arg in "$@"; do
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case "$arg" in
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--apply) DRY_RUN=0 ;;
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--dry-run) DRY_RUN=1 ;;
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--help|-h) usage; exit 0 ;;
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-*)
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echo "Error: unknown option '$arg'" >&2
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usage
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exit 1
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;;
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*)
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if [ "$CONTENT_DIR_SET" -eq 1 ]; then
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echo "Error: unexpected extra argument '$arg'" >&2
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usage
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exit 1
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fi
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CONTENT_DIR="$arg"
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CONTENT_DIR_SET=1
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;;
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esac
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done
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if ! command -v convert >/dev/null 2>&1; then
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echo "Error: ImageMagick 'convert' not found." >&2
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exit 1
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fi
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if ! command -v identify >/dev/null 2>&1; then
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echo "Error: ImageMagick 'identify' not found." >&2
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exit 1
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fi
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if [ ! -d "$CONTENT_DIR" ]; then
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echo "Error: content dir '$CONTENT_DIR' not found." >&2
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exit 1
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fi
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converted=0
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renamed_only=0
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skipped_ok=0
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skipped_png_small=0
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skipped_collision=0
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still_too_big=0
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errors=0
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mapfile -d '' files < <(find "$CONTENT_DIR" -type f \
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\( -name '*.png' -o -name '*.PNG' -o -name '*.jpeg' -o -name '*.jpg' -o -name '*.JPG' \) -print0 | sort -z)
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total=${#files[@]}
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echo "Found $total image(s) under $CONTENT_DIR"
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[ "$DRY_RUN" -eq 1 ] && echo "(dry run — no files will be changed)"
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echo
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update_refs() {
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# $1 old basename, $2 new basename, $3 directory to search (content root)
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local old="$1" new="$2" root="$3"
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grep -rlF -- "$old" "$root" --include='*.md' 2>/dev/null | while IFS= read -r mdfile; do
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OLD="$old" NEW="$new" perl -i -pe 's/\Q$ENV{OLD}\E/$ENV{NEW}/g' "$mdfile"
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echo " updated reference in $mdfile"
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done
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}
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i=0
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for src in "${files[@]}"; do
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i=$((i+1))
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dir=$(dirname "$src")
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base=$(basename "$src")
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stem="${base%.*}"
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ext="${base##*.}"
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target="$dir/$stem.jpg"
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printf '[%d/%d] %s\n' "$i" "$total" "$src"
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fmt=""
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if [ "$ext" = "png" ] || [ "$ext" = "PNG" ]; then
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w=$(identify -format '%w' "$src" 2>/dev/null)
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h=$(identify -format '%h' "$src" 2>/dev/null)
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size=$(stat -c%s "$src")
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longedge=$(( w > h ? w : h ))
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if [ "$longedge" -lt "$PNG_KEEP_MAX_DIM" ] && [ "$size" -lt "$PNG_KEEP_MAX_BYTES" ]; then
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echo " small PNG (${w}x${h}, ${size} bytes) below keep-as-is threshold, leaving untouched"
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skipped_png_small=$((skipped_png_small+1))
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continue
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fi
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else
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fmt=$(identify -format '%m' "$src" 2>/dev/null | head -c4)
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fi
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if [ "$fmt" = "JPEG" ]; then
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w=$(identify -format '%w' "$src" 2>/dev/null)
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h=$(identify -format '%h' "$src" 2>/dev/null)
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size=$(stat -c%s "$src")
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longedge=$(( w > h ? w : h ))
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if [ "$longedge" -le "$MAX_DIM" ] && [ "$size" -le "$MAX_BYTES" ]; then
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if [ "$target" = "$src" ]; then
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echo " already compliant, skipping"
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skipped_ok=$((skipped_ok+1))
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else
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if [ -e "$target" ]; then
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echo " COLLISION: target '$target' already exists — skipping, needs manual review" >&2
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skipped_collision=$((skipped_collision+1))
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elif [ "$DRY_RUN" -eq 1 ]; then
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echo " would rename (no re-encode needed) -> $target"
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else
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mv -f "$src" "$target"
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update_refs "$base" "$stem.jpg" "$CONTENT_DIR"
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renamed_only=$((renamed_only+1))
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echo " renamed (already compliant) -> $target"
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fi
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fi
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continue
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fi
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fi
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if [ "$target" != "$src" ] && [ -e "$target" ]; then
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echo " COLLISION: target '$target' already exists — skipping, needs manual review" >&2
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skipped_collision=$((skipped_collision+1))
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continue
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fi
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if [ "$DRY_RUN" -eq 1 ]; then
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echo " would convert -> $target"
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continue
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fi
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tmp=$(mktemp --suffix=.jpg "${dir}/.rsz-XXXXXX")
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quality=85
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dim=$MAX_DIM
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status=0
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while :; do
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if ! err=$(convert "$src" -auto-orient -background white -alpha remove -alpha off \
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-resize "${dim}x${dim}>" -strip -sampling-factor 4:2:0 -quality "$quality" "$tmp" 2>&1); then
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echo " ERROR converting $src: $err" >&2
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rm -f "$tmp"
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status=-1
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break
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fi
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size=$(stat -c%s "$tmp")
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if [ "$size" -le "$MAX_BYTES" ]; then
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status=1
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break
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fi
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if [ "$quality" -gt 40 ]; then
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quality=$((quality-5))
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continue
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fi
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if [ "$dim" -gt 800 ]; then
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dim=$((dim-160))
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quality=70
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continue
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fi
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status=2
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break
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done
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if [ "$status" -eq -1 ]; then
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errors=$((errors+1))
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continue
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fi
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if [ "$status" -eq 2 ]; then
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finalsize=$(stat -c%s "$tmp")
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echo " WARNING: could not get under $MAX_BYTES bytes (final ${finalsize} bytes, quality=$quality, dim=$dim)" >&2
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still_too_big=$((still_too_big+1))
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fi
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mv -f "$tmp" "$target"
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converted=$((converted+1))
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echo " converted -> $target ($(stat -c%s "$target") bytes)"
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if [ "$target" != "$src" ]; then
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rm -f "$src"
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update_refs "$base" "$stem.jpg" "$CONTENT_DIR"
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fi
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done
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echo
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echo "Done."
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echo " converted (re-encoded): $converted"
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echo " renamed only (already compliant): $renamed_only"
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echo " already compliant, untouched: $skipped_ok"
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echo " small PNGs kept as-is: $skipped_png_small"
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echo " skipped due to name collision: $skipped_collision"
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echo " still over size limit after max compression: $still_too_big"
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echo " errors: $errors"
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