allow one to skip_files with a list of regex (#13)

CHANGELOG.md

@@ -6,6 +6,15 @@ The format is based on [Keep a
 Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.3.0 - 2021-02-17
+
+### Added
+
+- Added a `:skip_files` key to the configuration of a manifest, allowing one
+  to provide a list of regex which will be checked against while sourcing files.
+  Any files found to match any of the regex will be excluded from generation.
+    - this allows a service author to 'take the reins' for that file
+
 ## 0.2.9 - 2020-11-02
 
 ### Fixed

lib/harness/manifest.ex

@@ -9,7 +9,11 @@ defmodule Harness.Manifest do
                        "manifest version is not compatible with the installed harness " <>
                        "archive. Please update the manifest or the harness archive."
 
-  defstruct generators: [], pkg_config: [], deps: [], manifest_version: nil
+  defstruct generators: [],
+            pkg_config: [],
+            deps: [],
+            skip_files: [],
+            manifest_version: nil
 
   @doc false
   def version, do: "~> 2.0"

lib/harness/renderer.ex

@@ -13,6 +13,7 @@ defmodule Harness.Renderer do
     |> Enum.map(&Run.source(&1, manifest.pkg_config, path))
     |> Enum.map(&Run.source_files/1)
     |> Enum.map(&Run.expand_paths/1)
+    |> Enum.map(&Run.skip_files(&1, manifest.skip_files))
     |> Enum.each(&render/1)
   end
 

lib/harness/renderer/run.ex

@@ -85,6 +85,16 @@ defmodule Harness.Renderer.Run do
     %{run | files: expanded_files}
   end
 
+  def skip_files(%__MODULE__{} = run, patterns) do
+    files =
+      run.files
+      |> Enum.reject(fn file ->
+        Enum.any?(patterns, &Regex.match?(&1, file.output_path))
+      end)
+
+    %{run | files: files}
+  end
+
   defp substitute_vars(path, flat_config) do
     Enum.reduce(flat_config, path, fn {config_key, config_val}, acc ->
       if String.contains?(path, "$#{config_key}$") do