Conditionally drop the usage of Errno in favor of File::Error (#331)

Author: Brian J. Cardiff

src/config.cr

@@ -28,11 +28,19 @@ module Shards
       path = File.expand_path(candidate)
       return path if File.exists?(path)
 
-      begin
-        Dir.mkdir_p(path)
-        return path
-      rescue Errno
-      end
+      {% if compare_versions(Crystal::VERSION, "0.34.0-0") > 0 %}
+        begin
+          Dir.mkdir_p(path)
+          return path
+        rescue File::Error
+        end
+      {% else %}
+        begin
+          Dir.mkdir_p(path)
+          return path
+        rescue Errno
+        end
+      {% end %}
     end
 
     raise Error.new("Failed to find or create cache directory")

src/package.cr

@@ -71,15 +71,23 @@ module Shards
           File.delete(destination)
         end
 
-        begin
-          File.link(source, destination)
-        rescue ex : Errno
-          if {Errno::EPERM, Errno::EXDEV}.includes?(ex.errno)
+        {% if compare_versions(Crystal::VERSION, "0.34.0-0") > 0 %}
+          begin
+            File.link(source, destination)
+          rescue File::Error
             FileUtils.cp(source, destination)
-          else
-            raise ex
           end
-        end
+        {% else %}
+          begin
+            File.link(source, destination)
+          rescue ex : Errno
+            if {Errno::EPERM, Errno::EXDEV}.includes?(ex.errno)
+              FileUtils.cp(source, destination)
+            else
+              raise ex
+            end
+          end
+        {% end %}
       end
     end
   end

src/resolvers/path.cr

@@ -41,16 +41,25 @@ module Shards
     end
 
     private def check_install_path_target
-      begin
-        real_install_path = File.real_path(install_path)
-      rescue errno : Errno
-        if errno.errno == Errno::ENOENT
+      {% if compare_versions(Crystal::VERSION, "0.34.0-0") > 0 %}
+        begin
+          real_install_path = File.real_path(install_path)
+        rescue File::NotFoundError
           return false
-        else
-          raise errno
         end
-      end
-      real_install_path == expanded_local_path
+        real_install_path == expanded_local_path
+      {% else %}
+        begin
+          real_install_path = File.real_path(install_path)
+        rescue errno : Errno
+          if errno.errno == Errno::ENOENT
+            return false
+          else
+            raise errno
+          end
+        end
+        real_install_path == expanded_local_path
+      {% end %}
     end
 
     def available_versions