feat: add system! method and spec

Fix the forgot input nil check

Author: initdc

.rubocop.yml

@@ -2,4 +2,7 @@ inherit_gem:
   rubocop-config-crystal: .rubocop.yml
 
 Metrics/BlockLength:
-  Enabled: false
+  Enabled: false
+
+Style/NonNilCheck:
+  Enabled: false

lib/cr/exec.rb

@@ -29,7 +29,7 @@ def output(*args, chomp: true, **options)
     end
 
     def each_line(*args, chomp: false, **options, &block)
-      if block
+      if block_given?
         IO.popen(*args, **options) do |pipe|
           pipe.each_line(chomp: chomp, &block)
         end
@@ -40,9 +40,9 @@ def each_line(*args, chomp: false, **options, &block)
 
     def answer(*args, input: nil, **options)
       IO.popen(*args, **options) do |pipe|
-        if input.is_a? Array
+        if input.is_a?(Array)
           input.each { |cmd| pipe.puts(cmd) }
-        else
+        elsif input != nil
           pipe.puts(input)
         end
         pipe.close_write
@@ -53,5 +53,9 @@ def answer(*args, input: nil, **options)
     def system?(...)
       system(...) ? true : false
     end
+
+    def system!(*args, **options)
+      system(*args, exception: true, **options)
+    end
   end
 end

spec/cr/exec_spec.rb

@@ -83,4 +83,9 @@
     p system("unamea")
     expect(Cr::Exec.system?("unamea")).to eq false
   end
+
+  it "system! raise" do
+    system("unamea")
+    expect { Cr::Exec.system!("unamea") }.to raise_error(Errno::ENOENT)
+  end
 end