dotfiles/scripts/optimize

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#!/usr/bin/env bash
# Optimizes everything the script can find in a folder,
# meaning it will compress files as much as possible,
# without losing any data (verification will be done
# in order to verify that no data has been done)
# (executable)
# TODO Run in parallel
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# TODO Lots of dupplicated code there
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dir=${1:-$PWD}
total=$(mktemp)
echo -n 0 > $total
function showtotal {
echo "Total saved: $(cat "$total") bytes"
rm $total
exit
}
trap showtotal SIGTERM SIGINT SIGFPE
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function doReplace { # candidate original
mv "$c" "$o"
saved=$(($os - $cs))
perc=$((100 * $saved / $os))
echo "→ $os ⇒ $cs (saved $saved bytes, or ${perc}%)"
newtotal=$(($(cat $total) + $saved))
echo -n $newtotal > $total
}
function replace { # candidate original
c="$1"
o="$2"
# File verifications
if [ ! -f "$o" ]; then
echo "→ Original is inexistant, skipping!"
return
fi
if [ ! -f "$c" ]; then
echo "→ Candidate is inexistant, skipping!"
return
fi
# Size verifications
cs=$(wc -c "$c" | cut -d' ' -f1)
os=$(wc -c "$o" | cut -d' ' -f1)
if [ $cs -le 0 ]; then
echo "→ Candidate is empty, skipping!"
rm "$c"
return
fi
if [ $cs -eq $os ]; then
echo "→ Candidate weight the same, skipping."
rm "$c"
return
fi
if [ $cs -gt $os ]; then
echo "→ Candidate is larger, skipping."
rm "$c"
return
fi
doReplace "$c" "$o"
}
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function replaceImg { # candidate original
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# With bitmap verification
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c="$1"
o="$2"
# File verifications
if [ ! -f "$o" ]; then
echo "→ Original is inexistant, skipping!"
return
fi
if [ ! -f "$c" ]; then
echo "→ Candidate is inexistant, skipping!"
return
fi
# Size verifications
cs=$(wc -c "$c" | cut -d' ' -f1)
os=$(wc -c "$o" | cut -d' ' -f1)
if [ $cs -le 0 ]; then
echo "→ Candidate is empty, skipping!"
rm "$c"
return
fi
if [ $cs -eq $os ]; then
echo "→ Candidate weight the same, skipping."
rm "$c"
return
fi
if [ $cs -gt $os ]; then
echo "→ Candidate is larger, skipping."
rm "$c"
return
fi
# Bitmap verification
ppmc="$(mktemp --suffix .ppm)"
ppmo="$(mktemp --suffix .ppm)"
convert "$c" "$ppmc"
convert "$o" "$ppmo"
if cmp --silent "$ppmo" "$ppmc"; then
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doReplace "$c" "$o"
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else
echo "→ Candidate don't have the same bit map as original, skipping!"
fi
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rm -f "$ppmc" "$ppmo" "$c"
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}
# JPEG (requires jpegtran)
while read image
do
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if [ -z "$image" ]; then continue; fi
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echo Processing $image
prog=$(mktemp --suffix .jpg)
jpegtran -copy all -progressive "$image" > "$prog"
echo "→ Progressive done"
progs=$(wc -c "$prog" | cut -d' ' -f1)
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replace "$prog" "$image"
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done <<< "$(find "$dir" -type f -iregex ".+.jpe?g$")"
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# PNG (requires optipng)
while read image
do
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if [ -z "$image" ]; then continue; fi
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echo Processing $image
temp=$(mktemp --suffix .png)
cp "$image" "$temp"
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optipng -quiet "$temp"
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echo "→ Optimize done"
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replace "$temp" "$image"
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done <<< "$(find "$dir" -type f -iname "*.png")"
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# # SVG (requires scour)
# while read image
# do
# if [ -z "$image" ]; then continue; fi
# echo Processing $image
#
# temp=$(mktemp --suffix .svg)
# scour --quiet "$image" "$temp" --no-line-breaks
# echo "→ Optimize done"
#
# replaceImg "$temp" "$image"
#
# done <<< "$(find "$dir" -type f -iname "*.svg")"
# NOTE Explicitely disabled since:
# - I only have ~50 MiB of SVG in TOTAL
# - Most conversions are not image losseless
# - Even when they are losseless, they are mostly worthless
# - I might want to keep editor data and/or ids for some of them
# So rather use scour explicitely when needed
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cleandev
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showtotal