Hey, thanks for the awesome library! I found thisreally useful on a recent project where I needed to subset some fonts.

It would be nice to be able to specify a name for the output file via a--name flag similar to the--output flag.

My use case

I had a specific use case where this would have been helpful.

In my case I was subsetting fonts for a dynamically populated blog, so instead of crawling a page/site and creating a subset based on its contents, I made alphabet-based subsets. For example, I provide a Latin subset, as well as Latin Extended, Cyrillic, Greek, Vietnamese, etc. This works well withunicode-range since the browser just loads the subsets it needs. This is similar to how Google Fonts handles subsetting:https://fonts.googleapis.com/css2?family=Roboto+Flex:opsz,wght@8..144,100&display=swap

Since I was creating a number of different subsets, I wanted to give them each a different name. e.g.Inter-latin-ext.woff2 instead ofInter-subset.woff2.

I couldn't find a good way to do this, so instead I had to create the subset font, and then rename it. That ended up with a script looking like this:

constsubsets=[/* subsets array */]for(constsubsetofsubsets){// We want to wait for each subset to finish before starting the next one// (this is required for to make sure we rename the right file)awaitnewPromise((resolve)=>{constglyphhangerProcess=spawn('glyphhanger',[`--whitelist=${subset.unicodeRange} `,`--subset=Inter.woff2`,'--output=subsets','--formats=woff2',],{stdio:'inherit'});glyphhangerProcess.on('close',()=>{// I couldn't figure out a way to change the output file name in glyphhanger// Instead we manually change it after the file is generatedconstoldPath=path.join(__dirname,`subsets/Inter-subset.woff2`);constnewPath=path.join(__dirname,`subsets/Inter-${subset.name}.woff2`);renameSync(oldPath,newPath);resolve();});});}

This works fine, but it feels a little verbose, and could be quicker if we could run the subsetting tasks in tandem. I'd like to be able to do this:

constsubsets=[/* subsets array */]awaitPromise.all(subsets.map(async(subset)=>{returnnewPromise((resolve)=>{constglyphhangerProcess=spawn('glyphhanger',[`--whitelist=${subset.unicodeRange} `,`--subset=Inter.woff2`,'--output=subsets',// Set the name via a flag!`--name=Inter-${subset.name}`,'--formats=woff2',],{stdio:'inherit'});glyphhangerProcess.on('close',()=>{resolve();});});}))

Let me know if I'm missing an option that would make this easier, or if you'd be open for a PR for this change. Thanks!