Add autoconf-archive detector

lib/xezat/detector/autoconf-archive.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module Xezat
+  module Detector
+    class AutoconfArchive
+      def detect(variables)
+        Find.find(variables[:S]) do |file|
+          next unless file.end_with?("#{File::SEPARATOR}configure.ac", "#{File::SEPARATOR}configure.in")
+
+          File.foreach(file) do |line|
+            return true if line.strip.start_with?('AX_')
+          end
+        end
+        false
+      end
+    end
+  end
+end

spec/detector/autoconf-archive_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'facets/file/atomic_write'
+require 'fileutils'
+require 'spec_helper'
+require 'tmpdir'
+require 'xezat/detector/autoconf-archive'
+
+describe Xezat::Detector::AutoconfArchive do
+  it 'contains AX_* in configure.ac' do
+    tmpdir = Dir.mktmpdir
+    File.atomic_write(File.expand_path(File.join(tmpdir, 'configure.ac'))) do |f|
+      f.puts('AX_COMPILER_FLAGS(')
+    end
+    detector = Xezat::Detector::AutoconfArchive.new
+    expect(detector.detect(S: tmpdir)).to be_truthy
+  end
+  it 'contains no AX_* in configure.ac' do
+    tmpdir = Dir.mktmpdir
+    File.atomic_write(File.expand_path(File.join(tmpdir, 'configure.ac'))) do |f|
+      f.puts('AC_INIT(')
+    end
+    detector = Xezat::Detector::AutoconfArchive.new
+    expect(detector.detect(S: tmpdir)).to be_falsey
+  end
+end