Implement rule versioning support

src/ameba/cli/cmd.cr

@@ -18,6 +18,9 @@ module Ameba::Cli
     config.autocorrect = autocorrect
     config.stdin_filename = opts.stdin_filename
 
+    if version = opts.version
+      config.version = version
+    end
     if globs = opts.globs
       config.globs = globs
     end
@@ -53,6 +56,7 @@ module Ameba::Cli
 
   private class Opts
     property config : Path?
+    property version : String?
     property formatter : Symbol | String | Nil
     property globs : Array(String)?
     property only : Array(String)?
@@ -90,6 +94,11 @@ module Ameba::Cli
         opts.config = Path[path] unless path.empty?
       end
 
+      parser.on("-u", "--up-to-version VERSION",
+        "Choose a version") do |version|
+        opts.version = version
+      end
+
       parser.on("-f", "--format FORMATTER",
         "Choose an output formatter: #{Config.formatter_names}") do |formatter|
         opts.formatter = formatter

src/ameba/config.cr

@@ -1,3 +1,4 @@
+require "semantic_version"
 require "yaml"
 require "./glob_utils"
 
@@ -63,6 +64,9 @@ class Ameba::Config
   getter rules : Array(Rule::Base)
   property severity = Severity::Convention
 
+  # Returns an ameba version to be used by `Ameba::Runner`.
+  property version : SemanticVersion?
+
   # Returns a list of paths (with wildcards) to files.
   # Represents a list of sources to be inspected.
   # If globs are not set, it will return default list of files.
@@ -100,6 +104,9 @@ class Ameba::Config
     @excluded = load_array_section(config, "Excluded")
     @globs = load_array_section(config, "Globs", DEFAULT_GLOBS)
 
+    if version = config["version"]?.try(&.as_s).presence
+      self.version = version
+    end
     if formatter_name = load_formatter_name(config)
       self.formatter = formatter_name
     end
@@ -194,6 +201,16 @@ class Ameba::Config
     @formatter = formatter.new
   end
 
+  # Sets version from string.
+  #
+  # ```
+  # config = Ameba::Config.load
+  # config.version = "1.6.0"
+  # ```
+  def version=(version : String)
+    @version = SemanticVersion.parse(version)
+  end
+
   # Updates rule properties.
   #
   # ```
@@ -329,6 +346,17 @@ class Ameba::Config
         @[YAML::Field(key: "Excluded")]
         property excluded : Array(String)?
       {% end %}
+
+      {% unless properties["since_version".id] %}
+        @[YAML::Field(key: "SinceVersion")]
+        property since_version : String?
+      {% end %}
+
+      def since_version : SemanticVersion?
+        if version = @since_version
+          SemanticVersion.parse(version)
+        end
+      end
     end
 
     macro included

src/ameba/formatter/todo_formatter.cr

@@ -61,6 +61,8 @@ module Ameba::Formatter
         # The point is for the user to remove these configuration records
         # one by one as the reported problems are removed from the code base.
 
+        version: "#{VERSION}"
+
         HEADER
     end
 

src/ameba/runner.cr

@@ -49,6 +49,9 @@ module Ameba
     # Returns `true` if correctable issues should be autocorrected.
     private getter? autocorrect : Bool
 
+    # Returns an ameba version up to which the rules should be ran.
+    property version : SemanticVersion?
+
     # Instantiates a runner using a `config`.
     #
     # ```
@@ -62,15 +65,20 @@ module Ameba
       @sources = config.sources
       @formatter = config.formatter
       @severity = config.severity
-      @rules = config.rules.select(&.enabled?).reject!(&.special?)
+      @version = config.version
+      @rules = config.rules.select do |rule|
+        rule.enabled? && !rule.special? &&
+          (!(version = @version) || !(since_version = rule.since_version) ||
+            since_version <= version)
+      end
       @autocorrect = config.autocorrect?
 
       @unneeded_disable_directive_rule =
         config.rules
           .find &.class.==(Rule::Lint::UnneededDisableDirective)
     end
 
-    protected def initialize(@rules, @sources, @formatter, @severity, @autocorrect = false)
+    protected def initialize(@rules, @sources, @formatter, @severity, @autocorrect = false, @version = nil)
     end
 
     # Performs the inspection. Iterates through all sources and test it using