Refactor site generator and add plugin to render projects

Readme.md

@@ -79,7 +79,7 @@ Execution, trying TDD for the first time:
 
     - [ ] Generate JSON feed
 
-    - [ ] Munge HTML files to make them available without an extension (index.html hack)
+    - [ ] Munge HTML files to make them available without an extension (index.html hack, do it in the SiteGenerator)
 
     - [ ] Inline CSS?
 

SiteGenerator/Sources/SiteGenerator/Date+CurrentYear.swift

@@ -0,0 +1,14 @@
+//
+//  Date+CurrentYear.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-02.
+//
+
+import Foundation
+
+extension Date {
+    static var currentYear: Int {
+        Calendar.current.dateComponents([.year], from: Date()).year!
+    }
+}

SiteGenerator/Sources/SiteGenerator/Generator.swift

@@ -1,108 +0,0 @@
-//
-//  Generator.swift
-//  SiteGenerator
-//
-//  Created by Sami Samhuri on 2019-12-01.
-//
-
-import Foundation
-import Ink
-import PathKit
-import Stencil
-
-public final class Generator {
-    private let fileManager: FileManager = .default
-
-    let site: Site
-    let sourceURL: URL
-
-    private let lessParser: LessParser
-    private let mdParser: MarkdownParser
-    private let templateRenderer: Environment
-
-    public init(sourceURL: URL) throws {
-        let siteURL = sourceURL.appendingPathComponent("site.json")
-        self.site = try Site.decode(from: siteURL)
-        self.sourceURL = sourceURL
-
-        let templatesURL = sourceURL.appendingPathComponent("templates")
-        self.templateRenderer = Environment(loader: FileSystemLoader(paths: [Path(templatesURL.path)]))
-
-        self.lessParser = LessParser()
-        self.mdParser = MarkdownParser()
-    }
-
-    public func generate(targetURL: URL) throws {
-        // Iterate through all files in public recursively and render or copy each one
-        let publicURL = sourceURL.appendingPathComponent("public")
-        try renderPath(publicURL.path, to: targetURL)
-    }
-
-    func renderPath(_ path: String, to targetURL: URL) throws {
-        for filename in try fileManager.contentsOfDirectory(atPath: path) {
-
-            // 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))
-                continue
-            }
-
-            // Make sure this path exists so we can write to it.
-            try fileManager.createDirectory(at: targetURL, withIntermediateDirectories: true, attributes: nil)
-
-            // Processes the file, transforming it if necessary.
-            try renderOrCopyFile(url: fileURL, targetDir: targetURL)
-        }
-    }
-
-    func renderOrCopyFile(url fileURL: URL, targetDir: URL) throws {
-        let filename = fileURL.lastPathComponent
-        guard filename != ".DS_Store", filename != ".gitkeep" else {
-            print("Ignoring hidden file \(filename)")
-            return
-        }
-
-        let ext = filename.split(separator: ".").last!
-        switch ext {
-        case "less":
-            let cssURL = targetDir.appendingPathComponent(filename.replacingOccurrences(of: ".less", with: ".css"))
-            try renderLess(from: fileURL, to: cssURL)
-
-        case "md":
-            let htmlURL = targetDir.appendingPathComponent(filename.replacingOccurrences(of: ".md", with: ".html"))
-            try renderMarkdown(from: fileURL, to: htmlURL)
-
-        default:
-            // Who knows. Copy the file unchanged.
-            let dest = targetDir.appendingPathComponent(filename)
-            try fileManager.copyItem(at: fileURL, to: dest)
-        }
-    }
-
-    func renderLess(from sourceURL: URL, to targetURL: URL) throws {
-        let less = try String(contentsOf: sourceURL, encoding: .utf8)
-        let css = try lessParser.parse(less)
-        try css.write(to: targetURL, atomically: true, encoding: .utf8)
-    }
-
-    func renderMarkdown(
-        from sourceURL: URL,
-        to targetURL: URL
-    ) throws {
-        let bodyMarkdown = try String(contentsOf: sourceURL, encoding: .utf8)
-        let bodyHTML = mdParser.html(from: bodyMarkdown).trimmingCharacters(in: .whitespacesAndNewlines)
-        let metadata = try markdownMetadata(from: sourceURL)
-        let page = Page(metadata: metadata)
-        let context = TemplateContext(site: site, page: page, metadata: metadata, body: bodyHTML)
-        let pageHTML = try templateRenderer.renderTemplate(name: "\(context.template).html", context: context.dictionary)
-        try pageHTML.write(to: targetURL, atomically: true, encoding: .utf8)
-    }
-
-    func markdownMetadata(from url: URL) throws -> [String: String] {
-        let md = try String(contentsOf: url, encoding: .utf8)
-        return mdParser.parse(md).metadata
-    }
-}

SiteGenerator/Sources/SiteGenerator/Generator/Generator.swift

@@ -0,0 +1,105 @@
+//
+//  Generator.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-01.
+//
+
+import Foundation
+import PathKit
+import Stencil
+
+public final class Generator: PluginDelegate, RendererDelegate {
+    // Dependencies
+    let fileManager: FileManager = .default
+    let templateRenderer: Environment
+
+    // Site properties
+    let site: Site
+    let sourceURL: URL
+    let plugins: [Plugin]
+    let renderers: [Renderer]
+
+    public init(sourceURL: URL, plugins: [Plugin], renderers: [Renderer]) throws {
+        let templatesURL = sourceURL.appendingPathComponent("templates")
+        let templatesPath = Path(templatesURL.path)
+        let loader = FileSystemLoader(paths: [templatesPath])
+        self.templateRenderer = Environment(loader: loader)
+
+        let siteURL = sourceURL.appendingPathComponent("site.json")
+        self.site = try Site.decode(from: siteURL)
+        self.sourceURL = sourceURL
+        self.plugins = plugins
+        self.renderers = renderers
+
+        for plugin in plugins {
+            try plugin.setUp(sourceURL: sourceURL)
+        }
+    }
+
+    public func generate(targetURL: URL) throws {
+        for plugin in plugins {
+            try plugin.render(targetURL: targetURL, delegate: self)
+        }
+
+        let publicURL = sourceURL.appendingPathComponent("public")
+        try renderPath(publicURL.path, to: targetURL)
+    }
+
+    // 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) {
+
+            // 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))
+                continue
+            }
+
+            // Make sure this path exists so we can write to it.
+            try fileManager.createDirectory(at: targetURL, withIntermediateDirectories: true, attributes: nil)
+
+            // Processes the file, transforming it if necessary.
+            try renderOrCopyFile(url: fileURL, targetDir: targetURL)
+        }
+    }
+
+    func renderOrCopyFile(url fileURL: URL, targetDir: URL) throws {
+        let filename = fileURL.lastPathComponent
+        guard filename != ".DS_Store", filename != ".gitkeep" else {
+            print("Ignoring hidden file \(filename)")
+            return
+        }
+
+        let ext = String(filename.split(separator: ".").last!)
+        for renderer in renderers {
+            if renderer.canRenderFile(named: filename, withExtension: ext) {
+                try renderer.render(fileURL: fileURL, targetDir: targetDir, delegate: self)
+                return
+            }
+        }
+
+        // Not handled by any renderer. Copy the file unchanged.
+        let dest = targetDir.appendingPathComponent(filename)
+        try fileManager.copyItem(at: fileURL, to: dest)
+    }
+
+    // MARK: - PluginDelegate and RendererDelegate
+
+    public func renderPage(bodyHTML: String, metadata: [String: String]) throws -> String {
+        let page = Page(metadata: metadata)
+        let context = PageContext(site: site, body: bodyHTML, page: page, metadata: metadata)
+        let pageHTML = try templateRenderer.renderTemplate(name: "\(context.template).html", context: context.dictionary)
+        return pageHTML
+    }
+
+    public func renderTemplate(name: String?, context: [String: Any]) throws -> String {
+        let siteContext = SiteContext(site: site, template: name)
+        let contextDict = siteContext.dictionary.merging(context, uniquingKeysWith: { _, new in new })
+        print("Rendering \(siteContext.template) with context \(contextDict)")
+        return try templateRenderer.renderTemplate(name: "\(siteContext.template).html", context: contextDict)
+    }
+}

SiteGenerator/Sources/SiteGenerator/Generator/PageContext.swift

@@ -1,17 +1,17 @@
 //
-//  TemplateContext.swift
-//  SiteGenerator
+//  File.swift
 //  
-//  Created by Sami Samhuri on 2019-12-01.
+//
+//  Created by Sami Samhuri on 2019-12-02.
 //
 
 import Foundation
 
-struct TemplateContext {
+struct PageContext {
     let site: Site
+    let body: String
     let page: Page
     let metadata: [String: String]
-    let body: String
 
     var title: String {
         guard !page.title.isEmpty else {
@@ -20,29 +20,23 @@ struct TemplateContext {
 
         return "\(site.title): \(page.title)"
     }
+}
 
+extension PageContext: TemplateContext {
     var template: String {
         page.template ?? site.template
     }
 
-    var currentYear: Int {
-        Calendar.current.dateComponents([.year], from: Date()).year!
-    }
-}
-
-// MARK: - Dictionary form
-
-extension TemplateContext {
     var dictionary: [String: Any] {
         [
             "site": site,
-            "page": page,
-            "metadata": metadata,
             "title": title,
             "body": body,
+            "page": page,
+            "metadata": metadata,
             "styles": site.styles + page.styles,
             "scripts": site.scripts + page.scripts,
-            "currentYear": currentYear,
+            "currentYear": Date.currentYear,
         ]
     }
 }

SiteGenerator/Sources/SiteGenerator/Generator/Plugin.swift

@@ -0,0 +1,19 @@
+//
+//  Plugin.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-02.
+//
+
+import Foundation
+
+public protocol PluginDelegate: AnyObject {
+    func renderPage(bodyHTML: String, metadata: [String: String]) throws -> String
+    func renderTemplate(name: String?, context: [String: Any]) throws -> String
+}
+
+public protocol Plugin {
+    func setUp(sourceURL: URL) throws
+
+    func render(targetURL: URL, delegate: PluginDelegate) throws
+}

SiteGenerator/Sources/SiteGenerator/Generator/Renderer.swift

@@ -0,0 +1,19 @@
+//
+//  Renderer.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-02.
+//
+
+import Foundation
+
+public protocol RendererDelegate: AnyObject {
+    func renderPage(bodyHTML: String, metadata: [String: String]) throws -> String
+    func renderTemplate(name: String?, context: [String: Any]) throws -> String
+}
+
+public protocol Renderer {
+    func canRenderFile(named filename: String, withExtension ext: String) -> Bool
+
+    func render(fileURL: URL, targetDir: URL, delegate: RendererDelegate) throws
+}

SiteGenerator/Sources/SiteGenerator/Generator/SiteContext.swift

@@ -0,0 +1,30 @@
+//
+//  SiteContext.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-01.
+//
+
+import Foundation
+
+struct SiteContext {
+    let site: Site
+    let template: String
+
+    init(site: Site, template: String? = nil) {
+        self.site = site
+        self.template = template ?? site.template
+    }
+}
+
+extension SiteContext: TemplateContext {
+    var dictionary: [String: Any] {
+        [
+            "site": site,
+            "title": site.title,
+            "styles": site.styles,
+            "scripts": site.scripts,
+            "currentYear": Date.currentYear,
+        ]
+    }
+}

SiteGenerator/Sources/SiteGenerator/Generator/TemplateContext.swift

@@ -0,0 +1,14 @@
+//
+//  TemplateContext.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-02.
+//
+
+import Foundation
+
+protocol TemplateContext {
+    var template: String { get }
+
+    var dictionary: [String : Any] { get }
+}

SiteGenerator/Sources/SiteGenerator/Model/Site.swift

@@ -7,13 +7,13 @@
 
 import Foundation
 
-struct Site {
-    let author: String
-    let title: String
-    let url: String
-    let template: String
-    let styles: [String]
-    let scripts: [String]
+public struct Site {
+    public let author: String
+    public let title: String
+    public let url: String
+    public let template: String
+    public let styles: [String]
+    public let scripts: [String]
 }
 
 extension Site {

SiteGenerator/Sources/SiteGenerator/Projects/Project.swift

@@ -0,0 +1,14 @@
+//
+//  Project.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-02.
+//
+
+import Foundation
+
+struct Project: Codable {
+    let title: String
+    let description: String
+    var path: String!
+}

SiteGenerator/Sources/SiteGenerator/Projects/ProjectsPlugin.swift

@@ -0,0 +1,59 @@
+//
+//  ProjectsPlugin.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-02.
+//
+
+import Foundation
+
+private struct Projects: Codable {
+    let projects: [Project]
+
+    static func decode(from url: URL) throws -> Projects {
+        let json = try Data(contentsOf: url)
+        let projects = try JSONDecoder().decode(Projects.self, from: json)
+        return projects
+    }
+}
+
+final class ProjectsPlugin: Plugin {
+    let fileManager: FileManager = .default
+    let path: String
+
+    var projects: [Project] = []
+    var sourceURL: URL!
+
+    init(path: String = "projects") {
+        self.path = path
+    }
+
+    func setUp(sourceURL: URL) throws {
+        self.sourceURL = sourceURL
+        let projectsURL = sourceURL.appendingPathComponent("projects.json")
+        if fileManager.fileExists(atPath: projectsURL.path) {
+            self.projects = try Projects.decode(from: projectsURL).projects.map { project in
+                Project(title: project.title, description: project.description, path: "/\(path)/\(project.title).html")
+            }
+        }
+    }
+
+    func render(targetURL: URL, delegate: PluginDelegate) throws {
+        guard !projects.isEmpty else {
+            return
+        }
+
+        let projectsDir = targetURL.appendingPathComponent(path)
+        try fileManager.createDirectory(at: projectsDir, withIntermediateDirectories: true, attributes: nil)
+        let projectsURL = projectsDir.appendingPathComponent("index.html")
+        let projectsHTML = try delegate.renderTemplate(name: "projects", context: ["projects": projects])
+        try projectsHTML.write(to: projectsURL, atomically: true, encoding: .utf8)
+
+        for project in projects {
+            let filename = "\(project.title).html"
+            let projectURL = projectsDir.appendingPathComponent(filename)
+            let projectHTML = try delegate.renderTemplate(name: "project", context: ["project": project])
+            try projectHTML.write(to: projectURL, atomically: true, encoding: .utf8)
+        }
+    }
+}

SiteGenerator/Sources/SiteGenerator/Renderers/LessRenderer.swift

@@ -1,15 +1,26 @@
 //
-//  LessParser.swift
+//  LessRenderer.swift
 //  SiteGenerator
 //
-//  Created by Sami Samhuri on 2019-12-01.
+//  Created by Sami Samhuri on 2019-12-02.
 //
 
 import Foundation
 
-/// Shells out to lessc on the command line.
-final class LessParser {
-    /// Parses Less and returns CSS.
+public final class LessRenderer: Renderer {
+    public func canRenderFile(named filename: String, withExtension ext: String) -> Bool {
+        ext == "less"
+    }
+
+    /// Parse Less and render it as CSS.
+    public func render(fileURL: URL, targetDir: URL, delegate: RendererDelegate) throws {
+        let filename = fileURL.lastPathComponent
+        let cssURL = targetDir.appendingPathComponent(filename.replacingOccurrences(of: ".less", with: ".css"))
+        let less = try String(contentsOf: fileURL, encoding: .utf8)
+        let css = try parse(less)
+        try css.write(to: cssURL, atomically: true, encoding: .utf8)
+    }
+
     func parse(_ less: String) throws -> String {
         let tempDir = URL(fileURLWithPath: NSTemporaryDirectory())
         defer {
@@ -24,7 +35,8 @@ final class LessParser {
         return try String(contentsOf: cssURL, encoding: .utf8)
     }
 
-    private let lesscPath = URL(fileURLWithPath: #file)
+    let lesscPath = URL(fileURLWithPath: #file)
+        .deletingLastPathComponent()
         .deletingLastPathComponent()
         .appendingPathComponent("node_modules")
         .appendingPathComponent("less")
@@ -33,7 +45,7 @@ final class LessParser {
         .path
 
     @discardableResult
-    private func shell(_ args: String...) -> Int32 {
+    func shell(_ args: String...) -> Int32 {
         let task = Process()
         task.launchPath = "/usr/bin/env"
         task.arguments = args

SiteGenerator/Sources/SiteGenerator/Renderers/MarkdownRenderer.swift

@@ -0,0 +1,34 @@
+//
+//  MarkdownRenderer.swift
+//  SiteGenerator
+//
+//  Created by Sami Samhuri on 2019-12-02.
+//
+
+import Foundation
+import Ink
+
+public final class MarkdownRenderer: Renderer {
+    let mdParser = MarkdownParser()
+
+    public func canRenderFile(named filename: String, withExtension ext: String) -> Bool {
+        ext == "md"
+    }
+
+    /// Parse Markdown and render it as HTML, running it through a Stencil template.
+    public func render(fileURL: URL, targetDir: URL, delegate: RendererDelegate) throws {
+        let mdFilename = fileURL.lastPathComponent
+        let htmlFilename = mdFilename.replacingOccurrences(of: ".md", with: ".html")
+        let htmlURL = targetDir.appendingPathComponent(htmlFilename)
+        let bodyMarkdown = try String(contentsOf: fileURL, encoding: .utf8)
+        let bodyHTML = mdParser.html(from: bodyMarkdown).trimmingCharacters(in: .whitespacesAndNewlines)
+        let metadata = try markdownMetadata(from: fileURL)
+        let pageHTML = try delegate.renderPage(bodyHTML: bodyHTML, metadata: metadata)
+        try pageHTML.write(to: htmlURL, atomically: true, encoding: .utf8)
+    }
+
+    func markdownMetadata(from url: URL) throws -> [String: String] {
+        let md = try String(contentsOf: url, encoding: .utf8)
+        return mdParser.parse(md).metadata
+    }
+}

SiteGenerator/Sources/SiteGenerator/main.swift

@@ -10,7 +10,11 @@ import Foundation
 func main(sourcePath: String, targetPath: String) throws {
     let sourceURL = URL(fileURLWithPath: sourcePath)
     let targetURL = URL(fileURLWithPath: targetPath)
-    let generator = try Generator(sourceURL: sourceURL)
+    let generator = try Generator(
+        sourceURL: sourceURL,
+        plugins: [ProjectsPlugin()],
+        renderers: [LessRenderer(), MarkdownRenderer()]
+    )
     try generator.generate(targetURL: targetURL)
 }
 

Tests/test-projects/expected/projects/index.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+<head>
+  <title>Nvidia, fuck you!</title>
+</head>
+<body>
+  <h1><a href="http://example.net">Nvidia, fuck you!</a></h1>
+
+  <ul>
+
+    <li><a href="/projects/linux.html">linux</a></li>
+
+  </ul>
+</body>
+</html>

Tests/test-projects/expected/projects/linux.html

@@ -0,0 +1,10 @@
+<!doctype html>
+<html>
+<head>
+  <title>Nvidia, fuck you!: linux</title>
+</head>
+<body>
+  <h1>linux</h1>
+  <h3>a (free) operating system (just a hobby, won't be big and professional like gnu)</h4>
+</body>
+</html>

Tests/test-projects/in/projects.json

@@ -0,0 +1,8 @@
+{
+  "projects": [
+    {
+      "title": "linux",
+      "description": "a (free) operating system (just a hobby, won't be big and professional like gnu)"
+    }
+  ]
+}

Tests/test-projects/in/site.json

@@ -0,0 +1,5 @@
+{
+  "author": "Linus Torvalds",
+  "title": "Nvidia, fuck you!",
+  "url": "http://example.net"
+}

Tests/test-projects/in/templates/project.html

@@ -0,0 +1,10 @@
+<!doctype html>
+<html>
+<head>
+  <title>{{ site.title }}: {{ project.title }}</title>
+</head>
+<body>
+  <h1>{{ project.title }}</h1>
+  <h3>{{ project.description }}</h4>
+</body>
+</html>

Tests/test-projects/in/templates/projects.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+<head>
+  <title>{{ site.title }}</title>
+</head>
+<body>
+  <h1><a href="{{ site.url }}">{{ site.title }}</a></h1>
+
+  <ul>
+{% for project in projects %}
+    <li><a href="{{ project.path }}">{{ project.title }}</a></li>
+{% endfor %}
+  </ul>
+</body>
+</html>