Unify all slugification under Slashlinks

We had a couple subtle divergences from Slashlinks, since these regexes
were originally written to allow for a wider range of posix portable
file name characters.

xcode/Subconscious/Shared/Components/AppView.swift

@@ -65,7 +65,7 @@ enum AppAction {
         AppAction.commit(
             query: query,
             // Since we don't have a slug, derive slug from query
-            slug: query.toSlug()
+            slug: Slashlink.slugify(query)
         )
     }
 }

xcode/Subconscious/Shared/Library/Slashlink.swift

@@ -15,17 +15,40 @@ extension Slashlink {
     }
 
     /// Given a string, returns a slashlink slug *without* the slash prefix.
-    static func toSlug(_ text: String) -> String {
+    static func slugify(_ text: String) -> String {
         text
             .lowercased()
-            .replacingSpacesWithDash()
-            .removingNonPosixCharacters()
+            // Replace runs of one or more space with a single dash
+            .replacingOccurrences(
+                of: #"\s+"#,
+                with: "-",
+                options: .regularExpression,
+                range: nil
+            )
+            // Remove all non-slug characters
+            .replacingOccurrences(
+                of: #"[^a-zA-Z0-9_\-\/]"#,
+                with: "",
+                options: .regularExpression,
+                range: nil
+            )
             .truncatingSafeFileNameLength()
             .ltrim(prefix: "/")
     }
 
+    /// Given a slug, returns a string that is close-enough to prose text
+    static func unslugify(_ slug: String) -> String {
+        slug
+            // Replace dash with space
+            .replacingOccurrences(
+                of: "-",
+                with: " "
+            )
+            .firstUppercased()
+    }
+
     static func slashlinkToURLString(_ text: String) -> String? {
-        let slashlink = toSlug(text)
+        let slashlink = slugify(text)
         if let url = URL(string: "sub://slashlink/\(slashlink)") {
             return url.absoluteString
         }
@@ -49,7 +72,7 @@ extension Slashlink {
         name: String,
         ext: String
     ) -> URL {
-        let slug = toSlug(name)
+        let slug = slugify(name)
         let url = base.appendingFilename(name: slug, ext: ext)
         if !FileManager.default.fileExists(atPath: url.path) {
             return url

xcode/Subconscious/Shared/Library/StringUtilities.swift

@@ -66,3 +66,19 @@ extension String {
         )
     }
 }
+
+extension String {
+    /// Truncate to avoid file name length limit issues.
+    /// Windows systems can handle up to 255, but we truncate at 200 to leave a bit of room
+    /// for things like version numbers.
+    func truncatingSafeFileNameLength() -> String {
+        String(self.prefix(200))
+    }
+}
+
+extension StringProtocol {
+    /// Upercase first letter in string.
+    func firstUppercased() -> String {
+        prefix(1).uppercased() + dropFirst()
+    }
+}

xcode/Subconscious/Shared/Models/Stub.swift

@@ -20,7 +20,7 @@ struct Stub: Hashable, Identifiable {
 
     init(title: String) {
         self.title = title
-        self.slug = title.toSlug()
+        self.slug = Slashlink.slugify(title)
     }
 
     var id: String { slug }

xcode/Subconscious/Shared/Services/DatabaseService.swift

@@ -290,7 +290,8 @@ struct DatabaseService {
         })
 
         var suggestions: [Suggestion] = []
-        if !resultSlugs.contains(query.toSlug()) {
+        let slug = Slashlink.slugify(query)
+        if !resultSlugs.contains(slug) {
             suggestions.append(
                 .search(
                     Stub(title: query)

xcode/Subconscious/Subconscious.xcodeproj/project.pbxproj

@@ -31,8 +31,6 @@
 		B82C3A6326F576FC00833CC8 /* URLUtilities.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82C3A6126F576FB00833CC8 /* URLUtilities.swift */; };
 		B82C3A6526F5796300833CC8 /* OptionalUtilities.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82C3A6426F5796300833CC8 /* OptionalUtilities.swift */; };
 		B82C3A6626F5796300833CC8 /* OptionalUtilities.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82C3A6426F5796300833CC8 /* OptionalUtilities.swift */; };
-		B82C3A6B26F6B18100833CC8 /* Slug.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82C3A6A26F6B18100833CC8 /* Slug.swift */; };
-		B82C3A6C26F6B18100833CC8 /* Slug.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82C3A6A26F6B18100833CC8 /* Slug.swift */; };
 		B82C3A6F26F6B1C000833CC8 /* Collections in Frameworks */ = {isa = PBXBuildFile; productRef = B82C3A6E26F6B1C000833CC8 /* Collections */; };
 		B82C3A7126F6B1C000833CC8 /* OrderedCollections in Frameworks */ = {isa = PBXBuildFile; productRef = B82C3A7026F6B1C000833CC8 /* OrderedCollections */; };
 		B82C3A7326F6B5B200833CC8 /* OrdereredDictionaryUtilities.swift in Sources */ = {isa = PBXBuildFile; fileRef = B82C3A7226F6B5B200833CC8 /* OrdereredDictionaryUtilities.swift */; };
@@ -113,7 +111,6 @@
 		B82C3A5E26F576C600833CC8 /* FileManagerUtilities.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FileManagerUtilities.swift; sourceTree = "<group>"; };
 		B82C3A6126F576FB00833CC8 /* URLUtilities.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = URLUtilities.swift; sourceTree = "<group>"; };
 		B82C3A6426F5796300833CC8 /* OptionalUtilities.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OptionalUtilities.swift; sourceTree = "<group>"; };
-		B82C3A6A26F6B18100833CC8 /* Slug.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Slug.swift; sourceTree = "<group>"; };
 		B82C3A7226F6B5B200833CC8 /* OrdereredDictionaryUtilities.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OrdereredDictionaryUtilities.swift; sourceTree = "<group>"; };
 		B82C3A7526F6B5BF00833CC8 /* StringUtilities.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StringUtilities.swift; sourceTree = "<group>"; };
 		B845FCC427051BF7001ECE4F /* Subtext4.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Subtext4.swift; sourceTree = "<group>"; };
@@ -295,7 +292,6 @@
 				B82C3A7226F6B5B200833CC8 /* OrdereredDictionaryUtilities.swift */,
 				B8EC568126F415C800AC64E5 /* PublisherBag.swift */,
 				B824FDD026FA98F300B81BBD /* ResultSet.swift */,
-				B82C3A6A26F6B18100833CC8 /* Slug.swift */,
 				B8EC568826F4204F00AC64E5 /* SQLite3Database.swift */,
 				B8EC568B26F4206400AC64E5 /* SQLite3Migrations.swift */,
 				B8082AA926F3B43A004B10BB /* Store.swift */,
@@ -513,7 +509,6 @@
 				B8EC568F26F4233B00AC64E5 /* AppEnvironment.swift in Sources */,
 				B82C3A7326F6B5B200833CC8 /* OrdereredDictionaryUtilities.swift in Sources */,
 				B82C3A5326F528B000833CC8 /* DatabaseService.swift in Sources */,
-				B82C3A6B26F6B18100833CC8 /* Slug.swift in Sources */,
 				B878C9822703F47A0042DF72 /* SuggestionLabelView.swift in Sources */,
 				B8E4B6F226F28BA600B9BE21 /* GrowableTextViewRepresentable.swift in Sources */,
 				B8879EA026F90C5100A0B4FF /* AppNavigationView.swift in Sources */,
@@ -553,7 +548,6 @@
 				B8EC569026F4233B00AC64E5 /* AppEnvironment.swift in Sources */,
 				B82C3A7426F6B5B200833CC8 /* OrdereredDictionaryUtilities.swift in Sources */,
 				B82C3A5426F528B000833CC8 /* DatabaseService.swift in Sources */,
-				B82C3A6C26F6B18100833CC8 /* Slug.swift in Sources */,
 				B878C9832703F47A0042DF72 /* SuggestionLabelView.swift in Sources */,
 				B8E4B6F326F28BA700B9BE21 /* GrowableTextViewRepresentable.swift in Sources */,
 				B8879EA126F90C5100A0B4FF /* AppNavigationView.swift in Sources */,