Skip all config when use with --gen-config.

spec/ameba/cli/cmd_spec.cr

@@ -82,6 +82,12 @@ module Ameba::Cli
         c.colors?.should be_true
       end
 
+      it "ignores --config if --gen-config flag passed" do
+        c = Cli.parse_args %w(--gen-config --config my_config.yml)
+        c.formatter.should eq :todo
+        c.skip_reading_config?.should be_true
+      end
+
       describe "-e/--explain" do
         it "configures file/line/column" do
           c = Cli.parse_args %w(--explain src/file.cr:3:5)

src/ameba/cli/cmd.cr

@@ -14,7 +14,7 @@ module Ameba::Cli
       raise "Invalid usage: Cannot explain an issue and autocorrect at the same time."
     end
 
-    config = Config.load opts.config, opts.colors?
+    config = Config.load path: opts.config, colors: opts.colors?, skip_reading_config: opts.skip_reading_config?
     config.autocorrect = autocorrect
 
     if globs = opts.globs
@@ -51,6 +51,7 @@ module Ameba::Cli
     property except : Array(String)?
     property location_to_explain : NamedTuple(file: String, line: Int32, column: Int32)?
     property fail_level : Severity?
+    property? skip_reading_config = false
     property? rules = false
     property? all = false
     property? colors = true
@@ -105,6 +106,7 @@ module Ameba::Cli
       parser.on("--gen-config",
         "Generate a configuration file acting as a TODO list") do
         opts.formatter = :todo
+        opts.skip_reading_config = true
       end
 
       parser.on("--fail-level SEVERITY",

src/ameba/config.cr

@@ -106,9 +106,13 @@ class Ameba::Config
   # ```
   # config = Ameba::Config.load
   # ```
-  def self.load(path = nil, colors = true)
+  def self.load(path = nil, colors = true, skip_reading_config = false)
     Colorize.enabled = colors
-    content = read_config(path) || "{}"
+    content = if skip_reading_config
+                "{}"
+              else
+                read_config(path) || "{}"
+              end
     Config.new YAML.parse(content)
   rescue e
     raise "Config file is invalid: #{e.message}"