Improve compression script with summary/analysis

frontend/compress.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -e
 
 multicompress() {
     local file="$1"
@@ -15,6 +16,30 @@ multicompress() {
     fi
 }
 
+commas() {
+    sed ':a;s/\B[0-9]\{3\}\>/,&/;ta'
+}
+
+get_size() {
+    find ./dist/ -type f -name $1 -print0 | du --files0-from=- -bc | tail -n1 | awk '{print $1}' | commas
+}
+
 export -f multicompress
+
+# find only non-compressed files in dist folder
+FILES=$(find ./dist/ -type f ! -name '*.gz' ! -name '*.br' ! -name '*.zst')
+
 # create pre-compressed variants gzip, zstd, brotli for dist files
-find ./dist/ -type f ! -name '*.gz' ! -name '*.br' ! -name '*.zst' -exec bash -c 'multicompress "$0"' {} \;
+echo "$FILES" | xargs -n1 -P0 bash -c 'multicompress "$@"' _
+
+# calculate sizes
+ORIGINAL_SIZE=$(echo "$FILES" | tr '\n' '\0' | du --files0-from=- -bc | tail -n1 | awk '{print $1}' | commas)
+GZIP_SIZE=$(get_size '*.gz')
+ZSTD_SIZE=$(get_size '*.zst')
+BROTLI_SIZE=$(get_size '*.br')
+
+export LC_NUMERIC="C.utf8"
+printf "Original size: %s bytes\n" $ORIGINAL_SIZE
+printf "Gzip size: %s bytes\n" "$GZIP_SIZE"
+printf "Zstd size: %s bytes\n" "$ZSTD_SIZE"
+printf "Brotli size: %s bytes\n" "$BROTLI_SIZE"