filesys.js

// do file management

const fs = require('fs')

module.exports = {
  // get a tree: takes the root (relative the process) and returns all branches below,
  // includes route-to-root in list
  getDirTree: (dir, debug) => {
    let tld = dir
    return new Promise((resolve, reject) => {
      // items and count,
      let list = []
      let count = 0
      // recursor,
      let launch = (dir) => {
        if (debug) console.log('GDT launch at', dir)
        // just counting actually,
        count++
        fs.readdir(dir, (err, files) => {
          if (err) {
            reject(err)
          }
          count--
          try {
            for (file of files) {
              if (file.includes('.')) {
                let listAddition = `${dir.substring(__dirname.length + tld.length)}/${file}`
                if (debug) console.log('GDT pushing', listAddition)
                list.push(listAddition)
              } else {
                let launchPoint = `${dir}${file}`
                if (debug) console.log('GDT launching', launchPoint)
                launch(launchPoint)
              }
            }
          } catch (err) {
            // just walk on ...
            console.log('walkover error:', err)
            console.log('problem dir:', dir)
            // and push up, give up on counting
            list.sort()
            resolve(list)
          }
          if (debug) console.log('GDT size', count)
          if (!count) {
            // we sort,
            list.sort()
            if(debug) console.log('list at fin getDirTree', list)
            resolve(list)
          }
        }) // end fs.readdir
      } // end launch
      launch(`${__dirname}/${dir}`)
    })
  }
}