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diff --git a/Shared/PostList/PostListModel.swift b/Shared/PostList/PostListModel.swift
index 8b221bc..686f3bf 100644
--- a/Shared/PostList/PostListModel.swift
+++ b/Shared/PostList/PostListModel.swift
@@ -1,86 +1,120 @@
import SwiftUI
import CoreData
class PostListModel: ObservableObject {
func remove(_ post: WFAPost) {
LocalStorageManager.persistentContainer.viewContext.delete(post)
LocalStorageManager().saveContext()
}
func purgePublishedPosts() {
let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "WFAPost")
fetchRequest.predicate = NSPredicate(format: "status != %i", 0)
let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
do {
try LocalStorageManager.persistentContainer.viewContext.executeAndMergeChanges(using: deleteRequest)
} catch {
print("Error: Failed to purge cached posts.")
}
}
func getBodyPreview(of post: WFAPost) -> String {
var elidedPostBody: String = ""
// Strip any markdown from the post body.
let strippedPostBody = stripMarkdown(from: post.body)
// Get the first 80 characters.
let firstEightyChars = String(strippedPostBody.prefix(80))
// Extract lede from post.
elidedPostBody = extractLede(from: firstEightyChars)
return elidedPostBody
}
}
private extension PostListModel {
func stripMarkdown(from string: String) -> String {
var strippedString = string
strippedString = stripHeadingOctothorpes(from: strippedString)
+ strippedString = stripImages(from: strippedString, keepAltText: true)
return strippedString
}
func stripHeadingOctothorpes(from string: String) -> String {
let newLines = CharacterSet.newlines
var processedComponents: [String] = []
let components = string.components(separatedBy: newLines)
for component in components {
if component.isEmpty {
continue
}
var newString = component
while newString.first == "#" {
newString.removeFirst()
}
if newString.hasPrefix(" ") {
newString.removeFirst()
}
processedComponents.append(newString)
}
let headinglessString = processedComponents.joined(separator: "\n\n")
return headinglessString
}
+ func stripImages(from string: String, keepAltText: Bool = false) -> String {
+ let pattern = #"!\[[\"]?(.*?)[\"|]?\]\(.*?\)"#
+ var processedComponents: [String] = []
+ let components = string.components(separatedBy: .newlines)
+ for component in components {
+ if component.isEmpty { continue }
+ var processedString: String = component
+ if keepAltText {
+ let regex = try? NSRegularExpression(pattern: pattern, options: [])
+ if let matches = regex?.matches(
+ in: component, options: [], range: NSRange(location: 0, length: component.utf16.count)
+ ) {
+ for match in matches {
+ if let range = Range(match.range(at: 1), in: component) {
+ processedString = "\(component[range])"
+ }
+ }
+ }
+ } else {
+ let range = component.startIndex..<component.endIndex
+ processedString = component.replacingOccurrences(
+ of: pattern,
+ with: "",
+ options: .regularExpression,
+ range: range
+ )
+ }
+ if processedString.isEmpty { continue }
+ processedComponents.append(processedString)
+ }
+ return processedComponents.joined(separator: "\n\n")
+ }
+
func extractLede(from string: String) -> String {
let terminatingCharacters = CharacterSet(charactersIn: ".。?").union(.newlines)
var lede: String
let sentences = string.components(separatedBy: terminatingCharacters)
let firstSentence = sentences.filter { !$0.isEmpty }[0]
if firstSentence == string {
let endOfStringIndex = string.lastIndex(of: " ")
lede = String(string[..<(endOfStringIndex ?? string.index(string.endIndex, offsetBy: -2))]) + "…"
} else {
lede = firstSentence
}
return lede
}
}

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