Add support for linting ECR files

Requires Crystal >= 1.15.0

README.md

@@ -174,6 +174,7 @@ In this example we define default globs and exclude `src/compiler` folder:
 ``` yaml
 Globs:
   - "**/*.cr"
+  - "**/*.ecr"
   - "!lib"
 
 Excluded:

src/ameba/config.cr

@@ -1,5 +1,6 @@
 require "semantic_version"
 require "yaml"
+require "ecr/processor"
 require "./glob_utils"
 
 # A configuration entry for `Ameba::Runner`.
@@ -57,10 +58,18 @@ class Ameba::Config
     Path[XDG_CONFIG_HOME] / "ameba/config.yml",
   }
 
-  DEFAULT_GLOBS = %w(
-    **/*.cr
-    !lib
-  )
+  {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+    DEFAULT_GLOBS = %w(
+      **/*.cr
+      **/*.ecr
+      !lib
+    )
+  {% else %}
+    DEFAULT_GLOBS = %w(
+      **/*.cr
+      !lib
+    )
+  {% end %}
 
   getter rules : Array(Rule::Base)
   property severity = Severity::Convention
@@ -167,7 +176,7 @@ class Ameba::Config
   # ```
   # config = Ameba::Config.load
   # config.sources # => list of default sources
-  # config.globs = ["**/*.cr"]
+  # config.globs = ["**/*.cr", "**/*.ecr"]
   # config.excluded = ["spec"]
   # config.sources # => list of sources pointing to files found by the wildcards
   # ```

src/ameba/glob_utils.cr

@@ -25,6 +25,11 @@ module Ameba
       globs
         .flat_map do |glob|
           glob += "/**/*.cr" if File.directory?(glob)
+
+          {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+            glob += "/**/*.ecr" if File.directory?(glob)
+          {% end %}
+
           Dir[glob]
         end
         .uniq!

src/ameba/source.cr

@@ -57,6 +57,24 @@ module Ameba
     # source.ast
     # ```
     getter ast : Crystal::ASTNode do
+      code = @code
+
+      {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+        if @path.ends_with?(".ecr")
+          begin
+            code = ECR.process_string(code, @path)
+          rescue ex : Crystal::SyntaxException
+            # Need to rescue to add the filename
+            raise Crystal::SyntaxException.new(
+              ex.message,
+              ex.line_number,
+              ex.column_number,
+              @path
+            )
+          end
+        end
+      {% end %}
+
       Crystal::Parser.new(code)
         .tap(&.wants_doc = true)
         .tap(&.filename = path)