Rename xcode image assets.

rename-imageset.sh

#!/bin/sh

old="$1"
new="$2"

if [ "x" = "x$old" -o "x" = "x$new" ]
then
    echo "usage $0 old new"
    exit 2
fi

dir=`dirname "$old"`
old=`basename "$old" .imageset`
new=`basename "$new" .imageset`

src="$dir/$old.imageset"
dst="$dir/$new.imageset"

if [ ! -d "$src" ]
then
    echo "$src: src not exists"
    exit 1
fi

if [ -x "$dst" ]
then
    echo "$dst: dst exists"
    exit 1
fi

(cat "$src/Contents.json" ; echo) | sed "s/$old/$new/" | perl -pe "chomp if eof" > "$src/Contents.json.new"
diff "$src/Contents.json" "$src/Contents.json.new"
mv "$src/Contents.json.new" "$src/Contents.json"

for ext in ".png" "@2x.png" "@3x.png"
do
    mv "$src/$old$ext" "$src/$new$ext"
done

mv "$src" "$dst"