pro-router-imba2/src/vite-plugin.js

let np = require('path')
let nfs = require('fs')

function file() { return np.resolve(process.cwd(), 'src/views.json') }

let viewsList = []
let viewPaths = {} // view: [path]
let pathViews = {} // path: [view]
function duplicate(obj){ return JSON.parse(JSON.stringify(obj)) }
function without(el, arr) { return arr.filter(function(e){ if(e != el) { return e } }) }

let config
module.exports = function proRouterViews() {
  return {
	name: 'pro-router-views',

	configResolved(resolvedConfig) {
		config = resolvedConfig
	},

	transform: {
	  order: 'pre',
	  handler(src, id) {
		if (config.command !== 'serve'){ return src }
		if (/\.imba$/.test(id)) {
		  let modified = false
		  let viewRegExp = /tag view-((\w|\S)+)( |\n)/g
		  let result = null
		  let views_str = ""
		  let views = pathViews[id] ||= []
		  let missingDeclarations = duplicate(views)
		  
		  while(result = viewRegExp.exec(src)) {
			let view = result[1]
			if(view != 'not_found'){
			  let paths = viewPaths[view] ||= []
			  missingDeclarations = without(view, missingDeclarations)
			  if(!views.includes(view)){
				views.push(view)
				if(!paths.includes(id)){
			  	  paths.push(id)
				}
			  }
			  if((paths[0] == id) && !viewsList.includes(view)){
				viewsList.push(view)
				modified = true
			  }
			}

		  }
		  missingDeclarations.forEach(function(view){
			let paths = viewPaths[view] ||= []
			if(!((paths[0] == id) && (paths.length > 1))){
			  paths = without(id, paths)
			  views = without(view, views)
			  viewsList = without(view, viewsList)
			  modified = true
			}
		  })
		  
		  if(modified)
		  	nfs.writeFileSync(file(), JSON.stringify(viewsList))

		  return { moduleSideEffects: modified }
		}
      }
    }
  }
}