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import chalk from "chalk";
import fs from "node:fs";
import { promisify } from "node:util";
import zlib from "node:zlib";
import { exec as nodeExec } from "node:child_process";
import isCleanWorkingDir from "./lib/isCleanWorkingDir.js";
const VERSION = 1;
const lastRunBranch = " last run";
const gzip = promisify( zlib.gzip );
const exec = promisify( nodeExec );
async function getBranchName() {
const { stdout } = await exec( "git rev-parse --abbrev-ref HEAD" );
return stdout.trim();
}
async function getCommitHash() {
const { stdout } = await exec( "git rev-parse HEAD" );
return stdout.trim();
}
function getBranchHeader( branch, commit ) {
let branchHeader = branch.trim();
if ( commit ) {
branchHeader = chalk.bold( branchHeader ) + chalk.gray( ` @${ commit }` );
} else {
branchHeader = chalk.italic( branchHeader );
}
return branchHeader;
}
async function getCache( loc ) {
let cache;
try {
const contents = await fs.promises.readFile( loc, "utf8" );
cache = JSON.parse( contents );
} catch ( err ) {
return {};
}
const lastRun = cache[ lastRunBranch ];
if ( !lastRun || !lastRun.meta || lastRun.meta.version !== VERSION ) {
console.log( "Compare cache version mismatch. Rewriting..." );
return {};
}
return cache;
}
function cacheResults( results ) {
const files = Object.create( null );
results.forEach( function( result ) {
files[ result.filename ] = {
raw: result.raw,
gz: result.gz
};
} );
return files;
}
function saveCache( loc, cache ) {
return fs.promises.writeFile( loc, JSON.stringify( cache ) );
}
function compareSizes( existing, current, padLength ) {
if ( typeof current !== "number" ) {
return chalk.grey( `${ existing }`.padStart( padLength ) );
}
const delta = current - existing;
if ( delta > 0 ) {
return chalk.red( `+${ delta }`.padStart( padLength ) );
}
return chalk.green( `${ delta }`.padStart( padLength ) );
}
function sortBranches( a, b ) {
if ( a === lastRunBranch ) {
return 1;
}
if ( b === lastRunBranch ) {
return -1;
}
if ( a < b ) {
return -1;
}
if ( a > b ) {
return 1;
}
return 0;
}
export async function compareSize( { cache = ".sizecache.json", files } = {} ) {
if ( !files || !files.length ) {
throw new Error( "No files specified" );
}
const branch = await getBranchName();
const commit = await getCommitHash();
const sizeCache = await getCache( cache );
let rawPadLength = 0;
let gzPadLength = 0;
const results = await Promise.all(
files.map( async function( filename ) {
let contents = await fs.promises.readFile( filename, "utf8" );
// Remove the short SHA and .dirty from comparisons.
// The short SHA so commits can be compared against each other
// and .dirty to compare with the existing branch during development.
const sha = /jQuery v\d+.\d+.\d+(?:-\w+)?\+(?:slim.)?([^ \.]+(?:\.dirty)?)/.exec( contents )[ 1 ];
contents = contents.replace( new RegExp( sha, "g" ), "" );
const size = Buffer.byteLength( contents, "utf8" );
const gzippedSize = ( await gzip( contents ) ).length;
// Add one to give space for the `+` or `-` in the comparison
rawPadLength = Math.max( rawPadLength, size.toString().length + 1 );
gzPadLength = Math.max( gzPadLength, gzippedSize.toString().length + 1 );
return { filename, raw: size, gz: gzippedSize };
} )
);
const sizeHeader = "raw".padStart( rawPadLength ) +
"gz".padStart( gzPadLength + 1 ) +
" Filename";
const sizes = results.map( function( result ) {
const rawSize = result.raw.toString().padStart( rawPadLength );
const gzSize = result.gz.toString().padStart( gzPadLength );
return `${ rawSize } ${ gzSize } ${ result.filename }`;
} );
const comparisons = Object.keys( sizeCache ).sort( sortBranches ).map( function( branch ) {
const meta = sizeCache[ branch ].meta || {};
const commit = meta.commit;
const files = sizeCache[ branch ].files;
const branchSizes = Object.keys( files ).map( function( filename ) {
const branchResult = files[ filename ];
const compareResult = results.find( function( result ) {
return result.filename === filename;
} ) || {};
const compareRaw = compareSizes( branchResult.raw, compareResult.raw, rawPadLength );
const compareGz = compareSizes( branchResult.gz, compareResult.gz, gzPadLength );
return `${ compareRaw } ${ compareGz } ${ filename }`;
} );
return [
"", // New line before each branch
getBranchHeader( branch, commit ),
sizeHeader,
...branchSizes
].join( "\n" );
} );
const output = [
"", // Opening new line
chalk.bold( "Sizes" ),
sizeHeader,
...sizes,
...comparisons,
"" // Closing new line
].join( "\n" );
console.log( output );
// Always save the last run
// Save version under last run
sizeCache[ lastRunBranch ] = {
meta: { version: VERSION },
files: cacheResults( results )
};
// Only save cache for the current branch
// if the working directory is clean.
if ( await isCleanWorkingDir() ) {
sizeCache[ branch ] = {
meta: { commit },
files: cacheResults( results )
};
console.log( `Saved cache for ${ branch }.` );
}
await saveCache( cache, sizeCache );
return results;
}
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