Implement resolve_source_path in BuildHelper

- Implemented the resolve_source_path method in BuildHelper to determine the destination paths for source files when writing to the builder.
- Refactored the logic in the direction block that handles the writing of source files to the builder, making the process clearer and more maintainable.
- Separated the logic that extracts the path of the startup script from the source files, enhancing the modularity of the code.

bin/ocran

@@ -452,22 +452,13 @@ module Ocran
 
       # Add explicitly mentioned files
       Ocran.msg "Adding user-supplied source files"
-      target_script = nil
-      source_files.each do |file|
-        if file.subpath?(exec_prefix)
-          target = file.relative_path_from(exec_prefix)
-        elsif file.subpath?(inst_src_prefix)
-          target = SRCDIR / file.relative_path_from(inst_src_prefix)
-        else
-          target = SRCDIR / file.basename
-        end
-
-        target_script ||= target
+      source_files.each do |source|
+        target = builder.resolve_source_path(source, inst_src_prefix)
 
-        if file.directory?
+        if source.directory?
           builder.mkdir(target)
         else
-          builder.cp(file, target)
+          builder.cp(source, target)
         end
       end
 
@@ -487,6 +478,7 @@ module Ocran
 
       # Add the opcode to launch the script
       installed_ruby_exe = BINDIR / Ocran.ruby_executable
+      target_script = builder.resolve_source_path(Ocran.script, inst_src_prefix)
       builder.exec(installed_ruby_exe, target_script, *@option.argv)
     end
   end

lib/ocran/build_helper.rb

@@ -25,6 +25,18 @@ def duplicate_to_gem_home(source, gem_path)
       copy_to_gem(source, Pathname(source).relative_path_from(gem_path))
     end
 
+    def resolve_source_path(source, root_prefix)
+      source = Pathname(source)
+
+      if source.subpath?(HostConfigHelper.exec_prefix)
+        source.relative_path_from(HostConfigHelper.exec_prefix)
+      elsif source.subpath?(root_prefix)
+        SRCDIR / source.relative_path_from(root_prefix)
+      else
+        SRCDIR / source.basename
+      end
+    end
+
     # Sets an environment variable with a joined path value.
     # This method processes an array of path strings or Pathname objects, accepts
     # absolute paths as is, and appends a placeholder to relative paths to convert