basic build and watch commands

.formatter.exs

@@ -1,4 +1,5 @@
 # Used by "mix format"
 [
-  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"],
+  import_deps: [:typed_struct]
 ]

.gitignore

@@ -26,3 +26,5 @@ sloane_sh-*.tar
 /tmp/
 
 /.elixir_ls/
+
+/priv/output/

lib/sloane_sh.ex

@@ -3,11 +3,24 @@ defmodule SloaneSH do
   Sloane's personal static site generator powering [sloane.sh](https://sloane.sh).
   """
 
+  alias SloaneSH.Build
+  alias SloaneSH.Watch
+  alias SloaneSH.Context
+
   def build(_opts \\ []) do
+    context()
+    |> Build.run()
+
     :ok
   end
 
   def watch(_opts \\ []) do
-    SloaneSH.Watch.start_link()
+    context()
+    |> Watch.start_link()
+  end
+
+  def context do
+    Context.new()
+    |> Context.init()
   end
 end

lib/sloane_sh/build.ex

@@ -0,0 +1,51 @@
+defmodule SloaneSH.Build do
+  require Logger
+
+  alias SloaneSH.Context
+  alias SloaneSH.Markdown
+  alias SloaneSH.Write
+
+  def run(%Context{} = ctx) do
+    ctx
+    |> build_pages()
+    |> build_posts()
+  end
+
+  def build_pages(%Context{} = ctx) do
+    Logger.info("Building pages...")
+    for page <- ctx.pages, do: build_page(ctx, page)
+
+    ctx
+  end
+
+  def build_posts(%Context{} = ctx) do
+    Logger.info("Building posts...")
+    for post <- ctx.posts, do: build_post(ctx, post)
+
+    ctx
+  end
+
+  def build_page(%Context{} = ctx, page) do
+    path = Path.join(ctx.config.pages_dir, page)
+
+    with {:ok, data} <- File.read(path),
+         {:ok, html} <- Markdown.transform(ctx, data),
+         :ok <- Write.page(ctx, page, html) do
+      Logger.info("Built page: #{page}")
+    else
+      err -> Logger.error("Failed to build page #{page}: #{inspect(err)}")
+    end
+  end
+
+  def build_post(%Context{} = ctx, post) do
+    path = Path.join(ctx.config.posts_dir, post)
+
+    with {:ok, data} <- File.read(path),
+         {:ok, html} <- Markdown.transform(ctx, data),
+         :ok <- Write.post(ctx, post, html) do
+      Logger.info("Built post: #{post}")
+    else
+      err -> Logger.error("Failed to build post #{post}: #{inspect(err)}")
+    end
+  end
+end

lib/sloane_sh/config.ex

@@ -0,0 +1,40 @@
+defmodule SloaneSH.Config do
+  @moduledoc """
+  SloaneSH configuration
+  """
+  use TypedStruct
+
+  alias __MODULE__
+
+  typedstruct do
+    field :pages_dir, String.t(), enforce: true
+    field :posts_dir, String.t(), enforce: true
+    field :output, String.t(), enforce: true
+  end
+
+  def default do
+    priv = :code.priv_dir(:sloane_sh) |> resolve_link()
+
+    %Config{
+      pages_dir: Path.join(priv, "site/pages"),
+      posts_dir: Path.join(priv, "site/posts"),
+      output: Path.join(priv, "output")
+    }
+  end
+
+  def in_config?(%Config{} = cfg, path) do
+    Enum.any?([cfg.pages_dir, cfg.posts_dir], &String.starts_with?(path, &1)) and
+      Path.extname(path) == ".md"
+  end
+
+  defp resolve_link(path) do
+    case File.read_link(path) do
+      {:ok, link} ->
+        dir = Path.dirname(path)
+        Path.expand(link, dir)
+
+      _ ->
+        path
+    end
+  end
+end

lib/sloane_sh/context.ex

@@ -0,0 +1,67 @@
+defmodule SloaneSH.Context do
+  @moduledoc """
+  A SloaneSH build context containing configuration and reference to content
+  files.
+  """
+  use TypedStruct
+
+  alias SloaneSH.Config
+  alias __MODULE__
+
+  typedstruct do
+    field :config, Config.t(), enforce: true
+    field :pages, [String.t()], default: []
+    field :posts, [String.t()], default: []
+  end
+
+  def new(config \\ Config.default()) do
+    %Context{config: config}
+  end
+
+  def init(%Context{config: config} = context) do
+    with {:ok, pages_contents} <- File.ls(config.pages_dir),
+         {:ok, posts_contents} <- File.ls(config.posts_dir) do
+      pages = Enum.filter(pages_contents, &String.match?(&1, ~r/.*\.md$/))
+      posts = Enum.filter(posts_contents, &String.match?(&1, ~r/.*\.md$/))
+      %Context{context | pages: pages, posts: posts}
+    end
+  end
+
+  def maybe_add(%Context{config: config} = ctx, path) do
+    if Config.in_config?(config, path) do
+      cond do
+        String.starts_with?(path, config.pages_dir) ->
+          page = Path.relative_to(path, config.pages_dir)
+          %{ctx | pages: Enum.uniq([page | ctx.pages])}
+
+        String.starts_with?(path, config.posts_dir) ->
+          post = Path.relative_to(path, config.posts_dir)
+          %{ctx | posts: Enum.uniq([post | ctx.posts])}
+
+        true ->
+          ctx
+      end
+    else
+      ctx
+    end
+  end
+
+  def in_context?(%Context{config: config, pages: pages, posts: posts}, path) do
+    with true <- Config.in_config?(config, path) do
+      cond do
+        String.starts_with?(path, config.pages_dir) ->
+          page = Path.relative_to(path, config.pages_dir)
+
+          [page in pages]
+
+        String.starts_with?(path, config.posts_dir) ->
+          post = Path.relative_to(path, config.posts_dir)
+
+          [post in posts]
+
+        true ->
+          false
+      end
+    end
+  end
+end

lib/sloane_sh/markdown.ex

@@ -0,0 +1,21 @@
+defmodule SloaneSH.Markdown do
+  @moduledoc """
+  Markdown parsing using `Earmark` and `Earmark.Parser`
+  """
+  require Logger
+
+  alias SloaneSH.Context
+
+  def transform(%Context{} = _ctx, data) when is_binary(data) do
+    case Earmark.as_html(data) do
+      {:ok, html_doc, deprecation_messages} ->
+        for msg <- deprecation_messages, do: Logger.warning(msg)
+
+        {:ok, html_doc}
+
+      {:error, html_doc, error_messages} ->
+        for msg <- error_messages, do: Logger.error(msg)
+        {:error, html_doc}
+    end
+  end
+end

lib/sloane_sh/watch.ex

@@ -1,29 +1,62 @@
 defmodule SloaneSH.Watch do
   use GenServer
+  use TypedStruct
   require Logger
 
-  def start_link(init_arg \\ [], opts \\ []) do
-    GenServer.start_link(__MODULE__, init_arg, opts)
+  alias SloaneSH.Build
+  alias SloaneSH.Context
+
+  typedstruct do
+    field :ctx, Context.t(), enforce: true
+    field :watcher_pid, pid(), enforce: true
+  end
+
+  def start_link(%Context{} = ctx, opts \\ []) do
+    GenServer.start_link(__MODULE__, ctx, opts)
   end
 
   @impl GenServer
-  def init([]) do
-    dirs = [Path.join(:code.priv_dir(:sloane_sh), "site")]
-    Logger.info("Watching #{inspect(dirs)} for changes")
-    {:ok, pid} = FileSystem.start_link(dirs: dirs)
-    FileSystem.subscribe(pid)
+  def init(%Context{} = ctx) do
+    {:ok, watcher_pid} =
+      FileSystem.start_link(
+        dirs:
+          dbg([
+            ctx.config.pages_dir,
+            ctx.config.posts_dir
+          ])
+      )
 
-    {:ok, pid}
+    FileSystem.subscribe(watcher_pid)
+
+    state = %__MODULE__{ctx: ctx, watcher_pid: watcher_pid}
+
+    {:ok, state, {:continue, :build}}
   end
 
   @impl GenServer
-  def handle_info({:file_event, pid, {path, events}}, pid) do
-    Logger.info("File event: #{inspect(path)} #{inspect(events)}")
-    {:noreply, pid}
+  def handle_continue(:build, %{ctx: ctx} = state) do
+    Build.run(ctx)
+
+    {:noreply, state}
   end
 
   @impl GenServer
-  def handle_info({:file_event, pid, :stop}, pid) do
+  def handle_info({:file_event, pid, {path, events}}, %{ctx: ctx, watcher_pid: pid} = state) do
+    ctx = Context.maybe_add(ctx, path)
+
+    if Context.in_context?(ctx, path) do
+      path = Path.relative_to(path, ctx.config.pages_dir)
+      Logger.info("File changed: #{path}")
+      Build.build_page(ctx, path)
+    end
+
+    %{state | ctx: ctx}
+
+    {:noreply, state}
+  end
+
+  @impl GenServer
+  def handle_info({:file_event, pid, :stop}, %{watcher_pid: pid}) do
     Logger.warning("File watcher stopped")
     {:stop, :watcher_stopped, pid}
   end

lib/sloane_sh/write.ex

@@ -0,0 +1,33 @@
+defmodule SloaneSH.Write do
+  def page(ctx, src, data) do
+    path = md_to_html(src)
+
+    write(ctx, path, data)
+  end
+
+  def post(ctx, src, data) do
+    path = Path.join("posts", md_to_html(src))
+
+    write(ctx, path, data)
+  end
+
+  def write(ctx, name, data) do
+    path = Path.join(ctx.config.output, name)
+
+    with :ok <- File.mkdir_p(Path.dirname(path)) do
+      File.write(path, data)
+    end
+  end
+
+  def md_to_html("index.md"), do: "index.html"
+
+  def md_to_html(path) do
+    dir = Path.dirname(path)
+    base = Path.basename(path, ".md")
+
+    case dir do
+      "." -> Path.join(base, "index.html")
+      _ -> Path.join([dir, base, "index.html"])
+    end
+  end
+end

mix.exs

@@ -21,7 +21,10 @@ defmodule SloaneSH.MixProject do
   # Run "mix help deps" to learn about dependencies.
   defp deps do
     [
-      {:file_system, "~> 1.0.0"}
+      {:file_system, "~> 1.0.0"},
+      {:typed_struct, "~> 0.3.0"},
+      {:earmark, "~> 1.4"},
+      {:earmark_parser, "~> 1.4"}
     ]
   end
 end

mix.lock

@@ -1,3 +1,6 @@
 %{
+  "earmark": {:hex, :earmark, "1.4.46", "8c7287bd3137e99d26ae4643e5b7ef2129a260e3dcf41f251750cb4563c8fb81", [:mix], [], "hexpm", "798d86db3d79964e759ddc0c077d5eb254968ed426399fbf5a62de2b5ff8910a"},
+  "earmark_parser": {:hex, :earmark_parser, "1.4.39", "424642f8335b05bb9eb611aa1564c148a8ee35c9c8a8bba6e129d51a3e3c6769", [:mix], [], "hexpm", "06553a88d1f1846da9ef066b87b57c6f605552cfbe40d20bd8d59cc6bde41944"},
   "file_system": {:hex, :file_system, "1.0.0", "b689cc7dcee665f774de94b5a832e578bd7963c8e637ef940cd44327db7de2cd", [:mix], [], "hexpm", "6752092d66aec5a10e662aefeed8ddb9531d79db0bc145bb8c40325ca1d8536d"},
+  "typed_struct": {:hex, :typed_struct, "0.3.0", "939789e3c1dca39d7170c87f729127469d1315dcf99fee8e152bb774b17e7ff7", [:mix], [], "hexpm", "c50bd5c3a61fe4e198a8504f939be3d3c85903b382bde4865579bc23111d1b6d"},
 }

priv/site/pages/index.md

@@ -0,0 +1,6 @@
+# Hello, World!
+
+my name is sloane. i am a software engineer.
+
+
+i'm on the fediverse [@sloane@tech.lgbt](https://tech.lgbt/@sloane)

priv/site/posts/2024-02-16-test-post.md

@@ -0,0 +1,3 @@
+# Test Post
+
+this is just a test of the posts functionality