macshome/MetadataSearching.swift

## MetadataSearching.swift
import Foundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

// Simple class to search for things with `NSMetadataQuery`.
class Searcher {
    // This is just for timing things
    let startTime = Date()

    // Setup the bits we need to construct a Spotlight search
    let metadataSearch = NSMetadataQuery()

    // The simple predicate here is any sort of executable file'
    let searchPredicate = NSPredicate(fromMetadataQueryString: "kMDItemContentTypeTree == 'public.executable' || kMDItemContentTypeTree == 'public.shell-script'")

    // We only need to search the Data volume as we can't install on the system one.
    let dataVolume = URL(fileURLWithPath: "/System/Volumes/Data")

    // In init we use the properties we just created.
    init() {
        self.metadataSearch.predicate = self.searchPredicate
        self.metadataSearch.searchScopes = [self.dataVolume]

        // I'm grouping results here by content type.
        self.metadataSearch.groupingAttributes = ["kMDItemContentType"]

        // Metadata Queries are async and we listen for updates. In this case just that the search finished.
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(done),
                                               name: .NSMetadataQueryDidFinishGathering,
                                               object: self.metadataSearch)
    }

    func startSearch() {
        // Just a wrapper to start the search.
        metadataSearch.start()
    }
    func stopSearch() {
        // Stop the search and the playground.
        metadataSearch.stop()
        PlaygroundPage.current.finishExecution()
    }

    // Simple method to be called when the search is done and print results.
    @objc func done()  {
        // Just our search time for utility.
        let time = Date().timeIntervalSince(startTime)

        // How many results did we find?
        let count = metadataSearch.resultCount
        print("Found \(count) results on APFS Data volume in \(time) seconds.")

        // Look at each group of results and print out the first 10 paths.
        for group in metadataSearch.groupedResults {
            print("\nFound: \(group.resultCount) of type: \(group.value)")
            var count = 0
            for item in group.results {
                if count > 10 { break }
                let mdItem = item as! NSMetadataItem
                print("Path: \(mdItem.value(forAttribute: kMDItemPath as String) as Any)")
                count += 1
            }
        }
        // Stop the search as we are all done.
        stopSearch()
    }
}

let foo = Searcher()

foo.startSearch()
	import Foundation
	import PlaygroundSupport

	PlaygroundPage.current.needsIndefiniteExecution = true

	// Simple class to search for things with `NSMetadataQuery`.
	class Searcher {
	// This is just for timing things
	let startTime = Date()

	// Setup the bits we need to construct a Spotlight search
	let metadataSearch = NSMetadataQuery()

	// The simple predicate here is any sort of executable file'
	let searchPredicate = NSPredicate(fromMetadataQueryString: "kMDItemContentTypeTree == 'public.executable' \|\| kMDItemContentTypeTree == 'public.shell-script'")

	// We only need to search the Data volume as we can't install on the system one.
	let dataVolume = URL(fileURLWithPath: "/System/Volumes/Data")

	// In init we use the properties we just created.
	init() {
	self.metadataSearch.predicate = self.searchPredicate
	self.metadataSearch.searchScopes = [self.dataVolume]

	// I'm grouping results here by content type.
	self.metadataSearch.groupingAttributes = ["kMDItemContentType"]

	// Metadata Queries are async and we listen for updates. In this case just that the search finished.
	NotificationCenter.default.addObserver(self,
	selector: #selector(done),
	name: .NSMetadataQueryDidFinishGathering,
	object: self.metadataSearch)
	}

	func startSearch() {
	// Just a wrapper to start the search.
	metadataSearch.start()
	}
	func stopSearch() {
	// Stop the search and the playground.
	metadataSearch.stop()
	PlaygroundPage.current.finishExecution()
	}

	// Simple method to be called when the search is done and print results.
	@objc func done() {
	// Just our search time for utility.
	let time = Date().timeIntervalSince(startTime)

	// How many results did we find?
	let count = metadataSearch.resultCount
	print("Found \(count) results on APFS Data volume in \(time) seconds.")

	// Look at each group of results and print out the first 10 paths.
	for group in metadataSearch.groupedResults {
	print("\nFound: \(group.resultCount) of type: \(group.value)")
	var count = 0
	for item in group.results {
	if count > 10 { break }
	let mdItem = item as! NSMetadataItem
	print("Path: \(mdItem.value(forAttribute: kMDItemPath as String) as Any)")
	count += 1
	}
	}
	// Stop the search as we are all done.
	stopSearch()
	}
	}

	let foo = Searcher()

	foo.startSearch()