TEMP: add benchmatk to demo performance difference

bench/bench.sh

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+#!/bin/bash
+
+# Function to run a script multiple times and measure performance
+run_benchmark() {
+    script_name=$1
+    runs=$2
+
+    # Check if script exists and is executable
+    if [ ! -x "$script_name" ]; then
+        echo "Error: $script_name not found or not executable"
+        exit 1
+    fi
+
+    total_time=0
+    total_cpu=0
+    max_memory=0
+
+    echo "Running $script_name $runs times..."
+
+    for ((i=1; i<=$runs; i++)); do
+        # Backup yarn.lock file before running the script
+        cp yarn.lock yarn.lock.backup
+
+        # Use time command to get execution statistics
+        # Redirect script output to /dev/null to keep benchmark output clean
+        stats=$( { /usr/bin/time -f "%e,%S,%U,%M" ./"$script_name" > /dev/null; } 2>&1 )
+
+        # cleanup
+        mv yarn.lock.backup yarn.lock
+        rm -f yarn.lock.toptal yarn.lock.temp || true
+
+        # Parse statistics
+        IFS=',' read -r real_time sys_time user_time memory <<< "$stats"
+
+        # Calculate CPU time (system + user time)
+        cpu_time=$(echo "$sys_time + $user_time" | bc)
+
+        # Update totals
+        total_time=$(echo "$total_time + $real_time" | bc)
+        total_cpu=$(echo "$total_cpu + $cpu_time" | bc)
+
+        # Update max memory if current usage is higher
+        if (( $(echo "$memory > $max_memory" | bc -l) )); then
+            max_memory=$memory
+        fi
+
+        echo -ne "\rProgress: $i/$runs"
+    done
+    echo # New line after progress
+
+    # Calculate averages
+    avg_time=$(echo "scale=3; $total_time / $runs" | bc)
+    avg_cpu=$(echo "scale=3; $total_cpu / $runs" | bc)
+
+    echo "Results for $script_name:"
+    echo "  Average real time: ${avg_time}s"
+    echo "  Average CPU time: ${avg_cpu}s"
+    echo "  Peak memory: ${max_memory}KB"
+    echo "------------------------"
+}
+
+# Number of times to run each script
+runs=5
+
+echo "Performance Comparison"
+echo "========================"
+
+# Run benchmarks for both scripts
+run_benchmark "new.sh" $runs
+run_benchmark "old.sh" $runs

bench/new.sh

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+#!/bin/bash
+
+PUBLIC_YARN_REGISTRY="https://registry.yarnpkg.com/"
+PUBLIC_NPM_REGISTRY="https://registry.npmjs.org/"
+TOPTAL_NPM_REGISTRY="https://us-central1-npm.pkg.dev/toptal-ci/npm-registry/"
+
+temp_yarn_lock="yarn.lock.temp"
+
+echo "Updating registry URLs in yarn.lock file and writing output to $temp_yarn_lock"
+# NOTE: setting IFS= (empty) for `read -r line` ensures that:
+#  1. Leading and trailing whitespace in each line is preserved
+#  2. The line is read exactly as-is, without any field splitting
+#  3. Any whitespace characters within the line remain untouched
+while IFS= read -r line; do
+    if [[ $line =~ /@toptal|/@topkit ]]; then
+        # For @toptal and @topkit packages, keep the original registry
+        echo "$line" >> "$temp_yarn_lock"
+    else
+        # For all other packages, replace with new registry
+        modified_line="${line//$PUBLIC_YARN_REGISTRY/$TOPTAL_NPM_REGISTRY}"
+        modified_line="${modified_line//$PUBLIC_NPM_REGISTRY/$TOPTAL_NPM_REGISTRY}"
+        echo "$modified_line" >> "$temp_yarn_lock"
+    fi
+done < yarn.lock
+
+echo "Replacing yarn.lock file with $temp_yarn_lock"
+mv $temp_yarn_lock yarn.lock
+
+echo "Registry URLs updated while preserving @toptal and @topkit package sources"

bench/old.sh

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+#!/bin/bash
+
+echo "Extracting @toptal and @topkit entries"
+touch yarn.lock.toptal
+if grep -q '/@toptal\|/@topkit' yarn.lock; then
+  grep '/@toptal\|/@topkit' yarn.lock | awk '{print $2 " " $2}' > yarn.lock.toptal
+fi
+
+echo "Changing the URLs to the new registry for @toptal and @topkit entries, creating a TO/FROM list to be used when reverting back the URLs to the original registry"
+sed -i -e "s#https://registry.yarnpkg.com/#https://us-central1-npm.pkg.dev/toptal-ci/npm-registry/#" yarn.lock.toptal
+sed -i -e "s#https://registry.npmjs.org/#https://us-central1-npm.pkg.dev/toptal-ci/npm-registry/#" yarn.lock.toptal
+
+echo "Changing the URLs to AR registry for all occurrences"
+sed -i -e "s#https://registry.yarnpkg.com/#https://us-central1-npm.pkg.dev/toptal-ci/npm-registry/#g" yarn.lock
+sed -i -e "s#https://registry.npmjs.org/#https://us-central1-npm.pkg.dev/toptal-ci/npm-registry/#g" yarn.lock
+
+echo "Removing double quotes from the URLs"
+sed -i -e "s/\"//g" yarn.lock.toptal
+
+echo "Reverting the @toptal and @topkit packages to the original registry, working on revert fewer ocurrences (specific list) is faster than loop all the file"
+while read -r line; do
+  url1="$(awk '{ print $1 }' <<<"$line")"
+  url2="$(awk '{ print $2 }' <<<"$line")"
+  sed -i -e "s~${url1}~${url2}~" yarn.lock
+done < yarn.lock.toptal