Added module error detection to npm install and respawn

bin/esm-cli.js

@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 const { resolve } = require('path')
+const { exec, spawn } = require('child_process')
 
 const switches = { json: false }, switchReg = /^=/
 let params = process.argv.slice(2)
@@ -33,21 +34,68 @@ const render = obj=> switches.json
 					? process.stdout.write( obj&& JSON.stringify(obj,null,'\t') || '' )
 					: console.log( obj || '' )
 
+const install = module=> {
+	process.stderr.write(`Module missing: ${module}
+	npm install ${module}\n`)
+	let npm = exec(`npm install ${module}`)
+	npm.stdout.pipe( process.stderr )
+	return npm
+}
 
-let mod = require( modulo || require(package).module )
-// console.log(mod)
+// const reTry = ()=> {
+	try {
+		let mod = require( modulo || require(package).module )
+		// console.log(mod)
 
-let toCall = mod[ exported || 'default' ]
-// console.log(mod, exported, toCall)
-let returned =
-		typeof toCall == 'function'
-				? toCall( args )
-				: toCall
+		let toCall = mod[ exported || 'default' ]
+		// console.log(mod, exported, toCall)
+		let returned =
+				typeof toCall == 'function'
+						? toCall( args )
+						: toCall
 
-//console.log( 'type' , typeof returned, returned instanceof Promise )
-returned instanceof Promise
-		? returned.then( render, e=>console.error(e) )
-		: render(returned)
+		//console.log( 'type' , typeof returned, returned instanceof Promise )
+		returned instanceof Promise
+				? returned.then( render, e=>console.error(e) )
+				: render(returned)
 
-module.exports = mod
-	
+		module.exports = mod
+	}
+	catch(e)
+	{
+		// console.log('error')
+		// console.log('error')
+		// console.log('error')
+		// console.log( e.code == 'MODULE_NOT_FOUND' )
+		// console.log( e.message )
+		if( e.code == 'MODULE_NOT_FOUND' )
+		{
+			let toLoad = e.message.match(/module\s+['"](?<module>.*)['"]/)?.groups?.module
+			toLoad && install( toLoad )
+			// console.log(`Module missing: ${toLoad}
+			// process.stderr.write(`Module missing: ${toLoad}
+			// npm install ${toLoad}\n`)
+			// let npm = exec(`npm install ${toLoad}`)
+			// npm.on('message', e=> console.log('message:', e))
+			// npm.stdout.pipe(process.stdout)//on('data', e=> console.log('data:', e))
+			.on('close', e=> {
+				process.stderr.write(`		esm ${process.argv.slice(2).join(' ')}\n`)
+				// reTry()
+				let reTry = exec(//'esm',process.argv.slice(2),
+					`esm ${process.argv.slice(2).join(' ')}`, 
+					{
+						detached: true,
+						stdio: 'inherit'
+						// stdio: [ 'ignore', process.stdout, process.stderr ]
+					})
+				reTry.unref()
+				// reTry.stderr.pipe( process.stderr )
+				// reTry.stdout.pipe( process.stderr )
+				// process.stdin.pipe( reTry.stdin )
+				// process.exit()
+			})
+		}
+	}
+// }
+
+// reTry() // 1st time