diff --git a/samhuri.net/Sources/samhuri.net/Files/FileManager+DirectoryExistence.swift b/samhuri.net/Sources/samhuri.net/Files/FileManager+DirectoryExistence.swift
new file mode 100644
index 0000000..a5014f5
--- /dev/null
+++ b/samhuri.net/Sources/samhuri.net/Files/FileManager+DirectoryExistence.swift
@@ -0,0 +1,16 @@
+//
+//  FileManager+DirectoryExistence.swift
+//  samhuri.net
+//
+//  Created by Sami Samhuri on 2020-01-01.
+//
+
+import Foundation
+
+extension FileManager {
+    func directoryExists(at fileURL: URL) -> Bool {
+        var isDir: ObjCBool = false
+        _ = fileExists(atPath: fileURL.path, isDirectory: &isDir)
+        return isDir.boolValue
+    }
+}
diff --git a/samhuri.net/Sources/samhuri.net/Files/FilePermissions.swift b/samhuri.net/Sources/samhuri.net/Files/FilePermissions.swift
index e72faa4..aa38a59 100644
--- a/samhuri.net/Sources/samhuri.net/Files/FilePermissions.swift
+++ b/samhuri.net/Sources/samhuri.net/Files/FilePermissions.swift
@@ -49,6 +49,9 @@ extension FilePermissions: RawRepresentable {
 
 extension FilePermissions: ExpressibleByStringLiteral {
     init(stringLiteral value: String) {
+        guard let _ = FilePermissions(string: value) else {
+            fatalError("Invalid FilePermissions string literal: \(value)")
+        }
         self.init(string: value)!
     }
 }
diff --git a/samhuri.net/Sources/samhuri.net/Files/Permissions.swift b/samhuri.net/Sources/samhuri.net/Files/Permissions.swift
index 8380c5a..c88fbf1 100644
--- a/samhuri.net/Sources/samhuri.net/Files/Permissions.swift
+++ b/samhuri.net/Sources/samhuri.net/Files/Permissions.swift
@@ -23,33 +23,28 @@ struct Permissions: OptionSet {
     }
 
     init?(string: String) {
+        guard string.count == 3 else {
+            return nil
+        }
+
         self.init(rawValue: 0)
 
         switch string[string.startIndex] {
-        case "r":
-            insert(.read)
-        case "-":
-            break
-        default:
-            return nil
+        case "r": insert(.read)
+        case "-": break
+        default: return nil
         }
 
         switch string[string.index(string.startIndex, offsetBy: 1)] {
-        case "w":
-            insert(.write)
-        case "-":
-            break
-        default:
-            return nil
+        case "w": insert(.write)
+        case "-": break
+        default: return nil
         }
 
         switch string[string.index(string.startIndex, offsetBy: 2)] {
-        case "x":
-            insert(.execute)
-        case "-":
-            break
-        default:
-            return nil
+        case "x": insert(.execute)
+        case "-": break
+        default: return nil
         }
     }
 }
@@ -66,6 +61,9 @@ extension Permissions: CustomStringConvertible {
 
 extension Permissions: ExpressibleByStringLiteral {
     init(stringLiteral value: String) {
+        guard let _ = Permissions(string: value) else {
+            fatalError("Invalid Permissions string literal: \(value)")
+        }
         self.init(string: value)!
     }
 }
diff --git a/samhuri.net/Sources/samhuri.net/Posts/Model/Month.swift b/samhuri.net/Sources/samhuri.net/Posts/Model/Month.swift
index 19140a0..2820d9f 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/Model/Month.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/Model/Month.swift
@@ -8,7 +8,7 @@
 import Foundation
 
 struct Month: Equatable {
-    static let all = (1 ... 12).map(Month.init(_:))
+    static let all = names.map(Month.init(_:))
 
     static let names = [
         "January", "February", "March", "April",
@@ -18,14 +18,22 @@ struct Month: Equatable {
 
     let number: Int
 
-    init(_ number: Int) {
-        precondition((1 ... 12).contains(number), "Month number must be from 1 to 12, got \(number)")
+    init?(_ number: Int) {
+        guard number < Month.all.count else {
+            return nil
+        }
         self.number = number
     }
 
-    init(_ name: String) {
-        precondition(Month.names.contains(name), "Month name is unknown: \(name)")
-        self.number = 1 + Month.names.firstIndex(of: name)!
+    init?(_ name: String) {
+        guard let index = Month.names.firstIndex(of: name) else {
+            return nil
+        }
+        self.number = index + 1
+    }
+
+    init(_ date: Date) {
+        self.init(date.month)!
     }
 
     var padded: String {
@@ -55,12 +63,18 @@ extension Month: Comparable {
 
 extension Month: ExpressibleByIntegerLiteral {
     init(integerLiteral value: Int) {
-        self.init(value)
+        guard let _ = Month(value) else {
+            fatalError("Invalid month number in string literal: \(value)")
+        }
+        self.init(value)!
     }
 }
 
 extension Month: ExpressibleByStringLiteral {
     init(stringLiteral value: String) {
-        self.init(value)
+        guard let _ = Month(value) else {
+            fatalError("Invalid month name in string literal: \(value)")
+        }
+        self.init(value)!
     }
 }
diff --git a/samhuri.net/Sources/samhuri.net/Posts/Model/MonthPosts.swift b/samhuri.net/Sources/samhuri.net/Posts/Model/MonthPosts.swift
index 4e57cd8..0be6509 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/Model/MonthPosts.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/Model/MonthPosts.swift
@@ -9,7 +9,7 @@ import Foundation
 
 struct MonthPosts {
     let month: Month
-    var posts: [Post]
+    private(set) var posts: [Post]
     let path: String
 
     var title: String {
@@ -23,4 +23,8 @@ struct MonthPosts {
     var year: Int {
         posts[0].date.year
     }
+
+    mutating func add(post: Post) {
+        posts.append(post)
+    }
 }
diff --git a/samhuri.net/Sources/samhuri.net/Posts/Model/PostsByYear.swift b/samhuri.net/Sources/samhuri.net/Posts/Model/PostsByYear.swift
index 3731800..39c8da7 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/Model/PostsByYear.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/Model/PostsByYear.swift
@@ -35,8 +35,8 @@ struct PostsByYear {
     }
 
     mutating func add(post: Post) {
-        let (year, month) = (post.date.year, Month(post.date.month))
-        self[year][month].posts.append(post)
+        let (year, month) = (post.date.year, Month(post.date))
+        self[year].add(post: post, to: month)
     }
 
     /// Returns an array of all posts.
diff --git a/samhuri.net/Sources/samhuri.net/Posts/Model/YearPosts.swift b/samhuri.net/Sources/samhuri.net/Posts/Model/YearPosts.swift
index 919d7b9..2ae89d5 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/Model/YearPosts.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/Model/YearPosts.swift
@@ -33,6 +33,10 @@ struct YearPosts {
         }
     }
 
+    mutating func add(post: Post, to month: Month) {
+        self[month].add(post: post)
+    }
+
     /// Returns an array of all posts.
     func flattened() -> [Post] {
         byMonth.values.flatMap { $0.posts }
diff --git a/samhuri.net/Sources/samhuri.net/Posts/PostMetadata.swift b/samhuri.net/Sources/samhuri.net/Posts/PostMetadata.swift
new file mode 100644
index 0000000..2b96602
--- /dev/null
+++ b/samhuri.net/Sources/samhuri.net/Posts/PostMetadata.swift
@@ -0,0 +1,48 @@
+//
+//  PostMetadata.swift
+//  samhuri.net
+//
+//  Created by Sami Samhuri on 2020-01-01.
+//
+
+import Foundation
+
+struct PostMetadata {
+    let title: String
+    let author: String
+    let date: Date
+    let formattedDate: String
+    let link: URL?
+    let tags: [String]
+    let scripts: [String]
+    let styles: [String]
+}
+
+extension PostMetadata {
+    enum Error: Swift.Error {
+        case deficientMetadata(slug: String, missingKeys: [String], metadata: [String: String])
+        case invalidTimestamp(String)
+    }
+
+    init(dictionary: [String: String], slug: String) throws {
+        let requiredKeys = ["Title", "Author", "Date", "Timestamp"]
+        let missingKeys = requiredKeys.filter { dictionary[$0] == nil }
+        guard missingKeys.isEmpty else {
+            throw Error.deficientMetadata(slug: slug, missingKeys: missingKeys, metadata: dictionary)
+        }
+        guard let timestamp = dictionary["Timestamp"], let timeInterval = TimeInterval(timestamp) else {
+            throw Error.invalidTimestamp(dictionary["Timestamp"]!)
+        }
+
+        self.init(
+            title: dictionary["Title"]!,
+            author: dictionary["Author"]!,
+            date: Date(timeIntervalSince1970: timeInterval),
+            formattedDate: dictionary["Date"]!,
+            link: dictionary["Link"].flatMap { URL(string: $0) },
+            tags: dictionary.commaSeparatedList(key: "Tags"),
+            scripts: dictionary.commaSeparatedList(key: "Scripts"),
+            styles: dictionary.commaSeparatedList(key: "Styles")
+        )
+    }
+}
diff --git a/samhuri.net/Sources/samhuri.net/Posts/PostRepo.swift b/samhuri.net/Sources/samhuri.net/Posts/PostRepo.swift
index 535aad9..157e970 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/PostRepo.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/PostRepo.swift
@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import Ink
 
 struct RawPost {
     let slug: String
@@ -18,13 +19,13 @@ final class PostRepo {
     let feedPostsCount = 30
 
     let fileManager: FileManager
-    let outputPath: String
+    let markdownParser: MarkdownParser
 
     private(set) var posts: PostsByYear!
 
-    init(fileManager: FileManager = .default, outputPath: String = "posts") {
+    init(fileManager: FileManager = .default, markdownParser: MarkdownParser = MarkdownParser()) {
         self.fileManager = fileManager
-        self.outputPath = outputPath
+        self.markdownParser = markdownParser
     }
 
     var isEmpty: Bool {
@@ -32,7 +33,7 @@ final class PostRepo {
     }
 
     var sortedPosts: [Post] {
-        posts?.flattened().sorted(by: >) ?? []
+        posts.flattened().sorted(by: >)
     }
 
     var recentPosts: [Post] {
@@ -48,14 +49,46 @@ final class PostRepo {
         return fileManager.fileExists(atPath: postsURL.path)
     }
 
-    func readPosts(sourceURL: URL) throws {
-        let postTransformer = PostTransformer(outputPath: outputPath)
+    func readPosts(sourceURL: URL, outputPath: String) throws {
         let posts = try readRawPosts(sourceURL: sourceURL)
-            .map(postTransformer.makePost)
+            .map { try makePost(from: $0, outputPath: outputPath) }
         self.posts = PostsByYear(posts: posts, path: "/\(outputPath)")
     }
+}
 
-    private func readRawPosts(sourceURL: URL) throws -> [RawPost] {
+private extension PostRepo {
+    func makePost(from rawPost: RawPost, outputPath: String) throws -> Post {
+        let result = markdownParser.parse(rawPost.markdown)
+        let metadata = try PostMetadata(dictionary: result.metadata, slug: rawPost.slug)
+        let path = pathForPost(root: outputPath, date: metadata.date, slug: rawPost.slug)
+        return Post(
+            slug: rawPost.slug,
+            title: metadata.title,
+            author: metadata.author,
+            date: metadata.date,
+            formattedDate: metadata.formattedDate,
+            link: metadata.link,
+            tags: metadata.tags,
+            scripts: metadata.scripts,
+            styles: metadata.styles,
+            body: result.html,
+            path: path
+        )
+    }
+
+    func pathForPost(root: String, date: Date, slug: String) -> String {
+        // format: /{root}/{year}/{month}/{slug}
+        //    e.g. /posts/2019/12/first-post
+        [
+            "",
+            root,
+            "\(date.year)",
+            Month(date).padded,
+            slug,
+        ].joined(separator: "/")
+    }
+
+    func readRawPosts(sourceURL: URL) throws -> [RawPost] {
         let postsURL = sourceURL.appendingPathComponent(postsPath)
         return try enumerateMarkdownFiles(directory: postsURL)
             .compactMap { url in
@@ -69,22 +102,20 @@ final class PostRepo {
             }
     }
 
-    private func readRawPost(url: URL) throws -> RawPost {
+    func readRawPost(url: URL) throws -> RawPost {
         let slug = url.deletingPathExtension().lastPathComponent
         let markdown = try String(contentsOf: url)
         return RawPost(slug: slug, markdown: markdown)
     }
 
-    private func enumerateMarkdownFiles(directory: URL) throws -> [URL] {
-        return try fileManager.contentsOfDirectory(atPath: directory.path).flatMap { (filename: String) -> [URL] in
-            let fileURL = directory.appendingPathComponent(filename)
-            var isDir: ObjCBool = false
-            _ = fileManager.fileExists(atPath: fileURL.path, isDirectory: &isDir)
-            if isDir.boolValue {
-                return try enumerateMarkdownFiles(directory: fileURL)
+    func enumerateMarkdownFiles(directory: URL) throws -> [URL] {
+        return try fileManager.contentsOfDirectory(atPath: directory.path).flatMap { (name: String) -> [URL] in
+            let url = directory.appendingPathComponent(name)
+            if fileManager.directoryExists(at: url) {
+                return try enumerateMarkdownFiles(directory: url)
             }
             else {
-                return fileURL.pathExtension == "md" ? [fileURL] : []
+                return url.pathExtension == "md" ? [url] : []
             }
         }
     }
diff --git a/samhuri.net/Sources/samhuri.net/Posts/PostTransformer.swift b/samhuri.net/Sources/samhuri.net/Posts/PostTransformer.swift
deleted file mode 100644
index 7b7739f..0000000
--- a/samhuri.net/Sources/samhuri.net/Posts/PostTransformer.swift
+++ /dev/null
@@ -1,98 +0,0 @@
-//
-//  PostTransformer.swift
-//  samhuri.net
-//
-//  Created by Sami Samhuri on 2019-12-09.
-//
-
-import Foundation
-import Ink
-
-final class PostTransformer {
-    let markdownParser: MarkdownParser
-    let outputPath: String
-
-    init(markdownParser: MarkdownParser = MarkdownParser(), outputPath: String = "posts") {
-        self.markdownParser = markdownParser
-        self.outputPath = outputPath
-    }
-
-    func makePost(from rawPost: RawPost) throws -> Post {
-        let result = markdownParser.parse(rawPost.markdown)
-        let metadata = try parseMetadata(result.metadata, slug: rawPost.slug)
-        let path = pathForPost(date: metadata.date, slug: rawPost.slug)
-        return Post(
-            slug: rawPost.slug,
-            title: metadata.title,
-            author: metadata.author,
-            date: metadata.date,
-            formattedDate: metadata.formattedDate,
-            link: metadata.link,
-            tags: metadata.tags,
-            scripts: metadata.scripts,
-            styles: metadata.styles,
-            body: result.html,
-            path: path
-        )
-    }
-
-    func pathForPost(date: Date, slug: String) -> String {
-        // format: /posts/2019/12/first-post
-        [
-            "",
-            outputPath,
-            "\(date.year)",
-            Month(date.month).padded,
-            slug,
-        ].joined(separator: "/")
-    }
-}
-
-private struct ParsedMetadata {
-    let title: String
-    let author: String
-    let date: Date
-    let formattedDate: String
-    let link: URL?
-    let tags: [String]
-    let scripts: [String]
-    let styles: [String]
-}
-
-private extension PostTransformer {
-    enum Error: Swift.Error {
-        case deficientMetadata(slug: String, missingKeys: [String], metadata: [String: String])
-        case invalidTimestamp(String)
-    }
-
-    func parseMetadata(_ metadata: [String: String], slug: String) throws -> ParsedMetadata {
-        let requiredKeys = ["Title", "Author", "Date", "Timestamp"]
-        let missingKeys = requiredKeys.filter { metadata[$0] == nil }
-        guard missingKeys.isEmpty else {
-            throw Error.deficientMetadata(slug: slug, missingKeys: missingKeys, metadata: metadata)
-        }
-        guard let timeInterval = TimeInterval(metadata["Timestamp"]!) else {
-            throw Error.invalidTimestamp(metadata["Timestamp"]!)
-        }
-
-        let title = metadata["Title"]!
-        let author = metadata["Author"]!
-        let date = Date(timeIntervalSince1970: timeInterval)
-        let formattedDate = metadata["Date"]!
-        let link = metadata["Link"].flatMap { URL(string: $0) }
-        let tags = metadata.commaSeparatedList(key: "Tags")
-        let scripts = metadata.commaSeparatedList(key: "Scripts")
-        let styles = metadata.commaSeparatedList(key: "Styles")
-
-        return ParsedMetadata(
-            title: title,
-            author: author,
-            date: date,
-            formattedDate: formattedDate,
-            link: link,
-            tags: tags,
-            scripts: scripts,
-            styles: styles
-        )
-    }
-}
diff --git a/samhuri.net/Sources/samhuri.net/Posts/PostWriter.swift b/samhuri.net/Sources/samhuri.net/Posts/PostWriter.swift
index dc0ffac..c016d69 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/PostWriter.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/PostWriter.swift
@@ -31,7 +31,7 @@ extension PostWriter {
     }
 
     private func filePath(date: Date, slug: String) -> String {
-        "/\(date.year)/\(Month(date.month).padded)/\(slug)/index.html"
+        "/\(date.year)/\(Month(date).padded)/\(slug)/index.html"
     }
 }
 
diff --git a/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin+Builder.swift b/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin+Builder.swift
index 431e305..8029bb9 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin+Builder.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin+Builder.swift
@@ -47,14 +47,11 @@ extension PostsPlugin {
         }
 
         func build() -> PostsPlugin {
-            let postRepo: PostRepo
             let postWriter: PostWriter
             if let outputPath = path {
-                postRepo = PostRepo(outputPath: outputPath)
                 postWriter = PostWriter(outputPath: outputPath)
             }
             else {
-                postRepo = PostRepo()
                 postWriter = PostWriter()
             }
 
@@ -76,7 +73,7 @@ extension PostsPlugin {
 
             return PostsPlugin(
                 renderer: renderer,
-                postRepo: postRepo,
+                postRepo: PostRepo(),
                 postWriter: postWriter,
                 jsonFeedWriter: jsonFeedWriter,
                 rssFeedWriter: rssFeedWriter
diff --git a/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin.swift b/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin.swift
index b11bef3..9da4b83 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/PostsPlugin.swift
@@ -37,7 +37,7 @@ final class PostsPlugin: Plugin {
             return
         }
 
-        try postRepo.readPosts(sourceURL: sourceURL)
+        try postRepo.readPosts(sourceURL: sourceURL, outputPath: postWriter.outputPath)
     }
 
     func render(site: Site, targetURL: URL) throws {
diff --git a/samhuri.net/Sources/samhuri.net/Posts/Templates/PageRenderer+RSSFeed.swift b/samhuri.net/Sources/samhuri.net/Posts/Templates/PageRenderer+RSSFeed.swift
index 7155d6c..538b521 100644
--- a/samhuri.net/Sources/samhuri.net/Posts/Templates/PageRenderer+RSSFeed.swift
+++ b/samhuri.net/Sources/samhuri.net/Posts/Templates/PageRenderer+RSSFeed.swift
@@ -12,7 +12,7 @@ extension PageRenderer: RSSFeedRendering {
     func renderRSSFeed(posts: [Post], feedURL: URL, site: Site) throws -> String {
         try RSS(
             .title(site.title),
-            .if(site.description != nil, .description(site.description!)),
+            .description(site.description),
             .link(site.url),
             .pubDate(posts[0].date),
             .atomLink(feedURL),
diff --git a/samhuri.net/Sources/samhuri.net/Projects/ProjectsPlugin.swift b/samhuri.net/Sources/samhuri.net/Projects/ProjectsPlugin.swift
index 407d946..40a0bb5 100644
--- a/samhuri.net/Sources/samhuri.net/Projects/ProjectsPlugin.swift
+++ b/samhuri.net/Sources/samhuri.net/Projects/ProjectsPlugin.swift
@@ -20,7 +20,6 @@ final class ProjectsPlugin: Plugin {
     let projectAssets: TemplateAssets
 
     var projects: [Project] = []
-    var sourceURL: URL!
 
     init(
         projects: [PartialProject],
@@ -39,7 +38,6 @@ final class ProjectsPlugin: Plugin {
     // MARK: - Plugin methods
 
     func setUp(site: Site, sourceURL: URL) throws {
-        self.sourceURL = sourceURL
         projects = partialProjects.map { partial in
             Project(
                 title: partial.title,
diff --git a/samhuri.net/Sources/samhuri.net/Site/MarkdownRenderer.swift b/samhuri.net/Sources/samhuri.net/Site/MarkdownRenderer.swift
index c4556c3..658a5a4 100644
--- a/samhuri.net/Sources/samhuri.net/Site/MarkdownRenderer.swift
+++ b/samhuri.net/Sources/samhuri.net/Site/MarkdownRenderer.swift
@@ -9,7 +9,6 @@ import Foundation
 import Ink
 
 final class MarkdownRenderer: Renderer {
-    let fileManager: FileManager = .default
     let fileWriter: FileWriting
     let markdownParser = MarkdownParser()
     let pageRenderer: PageRendering
@@ -25,7 +24,7 @@ final class MarkdownRenderer: Renderer {
 
     /// Parse Markdown and render it as HTML, running it through a Stencil template.
     func render(site: Site, fileURL: URL, targetDir: URL) throws {
-        let bodyMarkdown = try String(contentsOf: fileURL, encoding: .utf8)
+        let bodyMarkdown = try String(contentsOf: fileURL)
         let bodyHTML = markdownParser.html(from: bodyMarkdown).trimmingCharacters(in: .whitespacesAndNewlines)
         let metadata = try markdownMetadata(from: fileURL)
         let pageHTML = try pageRenderer.renderPage(site: site, bodyHTML: bodyHTML, metadata: metadata)
@@ -43,7 +42,7 @@ final class MarkdownRenderer: Renderer {
     }
 
     func markdownMetadata(from url: URL) throws -> [String: String] {
-        let md = try String(contentsOf: url, encoding: .utf8)
+        let md = try String(contentsOf: url)
         return markdownParser.parse(md).metadata
     }
 }
diff --git a/samhuri.net/Sources/samhuri.net/Site/Site+Builder.swift b/samhuri.net/Sources/samhuri.net/Site/Site+Builder.swift
index b87a175..1625df4 100644
--- a/samhuri.net/Sources/samhuri.net/Site/Site+Builder.swift
+++ b/samhuri.net/Sources/samhuri.net/Site/Site+Builder.swift
@@ -10,7 +10,7 @@ import Foundation
 extension Site {
     final class Builder {
         private let title: String
-        private let description: String?
+        private let description: String
         private let author: String
         private let email: String
         private let url: URL
@@ -23,7 +23,7 @@ extension Site {
 
         init(
             title: String,
-            description: String? = nil,
+            description: String,
             author: String,
             email: String,
             url: URL
diff --git a/samhuri.net/Sources/samhuri.net/Site/Site.swift b/samhuri.net/Sources/samhuri.net/Site/Site.swift
index 4ea98b7..5fc5880 100644
--- a/samhuri.net/Sources/samhuri.net/Site/Site.swift
+++ b/samhuri.net/Sources/samhuri.net/Site/Site.swift
@@ -11,7 +11,7 @@ struct Site {
     let author: String
     let email: String
     let title: String
-    let description: String?
+    let description: String
     let url: URL
     let styles: [String]
     let scripts: [String]
diff --git a/samhuri.net/Sources/samhuri.net/Site/SiteGenerator.swift b/samhuri.net/Sources/samhuri.net/Site/SiteGenerator.swift
index 2c441cb..c38139a 100644
--- a/samhuri.net/Sources/samhuri.net/Site/SiteGenerator.swift
+++ b/samhuri.net/Sources/samhuri.net/Site/SiteGenerator.swift
@@ -41,17 +41,15 @@ final class SiteGenerator {
 
     // Recursively copy or render every file in the given path.
     func renderPath(_ path: String, to targetURL: URL) throws {
-        for filename in try fileManager.contentsOfDirectory(atPath: path) {
-            guard !ignoredFilenames.contains(filename) else {
+        for name in try fileManager.contentsOfDirectory(atPath: path) {
+            guard !ignoredFilenames.contains(name) else {
                 continue
             }
 
             // Recurse into subdirectories, updating the target directory as well.
-            let fileURL = URL(fileURLWithPath: path).appendingPathComponent(filename)
-            var isDir: ObjCBool = false
-            _ = fileManager.fileExists(atPath: fileURL.path, isDirectory: &isDir)
-            guard !isDir.boolValue else {
-                try renderPath(fileURL.path, to: targetURL.appendingPathComponent(filename))
+            let url = URL(fileURLWithPath: path).appendingPathComponent(name)
+            guard !fileManager.directoryExists(at: url) else {
+                try renderPath(url.path, to: targetURL.appendingPathComponent(name))
                 continue
             }
 
@@ -59,7 +57,7 @@ final class SiteGenerator {
             try fileManager.createDirectory(at: targetURL, withIntermediateDirectories: true, attributes: nil)
 
             // Process the file, transforming it if necessary.
-            try renderOrCopyFile(url: fileURL, targetDir: targetURL)
+            try renderOrCopyFile(url: url, targetDir: targetURL)
         }
     }