replace $(projectdir) by os.projectdir()

[charlesseizilles]

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[gemini-code-assist]

Summary of Changes

Hello @charlesseizilles, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the clarity and consistency of documentation examples. It updates specific code snippets in the API documentation to use the os.projectdir() function instead of the $(projectdir) variable. This modification ensures that users configuring module and plugin directories in their xmake.lua files are guided towards a more standardized and reliable method for path resolution.

Highlights

• Documentation Update: Replaced the use of the $(projectdir) variable with the os.projectdir() function in code examples within the docs/api/description/global-interfaces.md file.
• Consistency and Robustness: The change promotes a more programmatic and potentially robust way to reference the project directory in xmake.lua configuration examples for add_moduledirs and add_plugindirs.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to use os.projectdir() instead of $(projectdir), which is a good improvement. I've suggested using path.join for better cross-platform path construction. Additionally, it seems this change has not been applied to all relevant documentation files. For instance, the Chinese version of this document (docs/zh/api/description/global-interfaces.md) and other examples in docs/api/scripts/builtin-modules/os.md still use the old $(projectdir) syntax. It would be great to update them as well for consistency.

[gemini-code-assist]

For better cross-platform compatibility and code clarity when constructing paths, it's recommended to use path.join() instead of string concatenation. This ensures that the correct path separator is used regardless of the operating system.

Suggested change

	add_moduledirs(os.projectdir() .. "/modules")
	add_moduledirs(path.join(os.projectdir(), "modules"))

[gemini-code-assist]

For better cross-platform compatibility and code clarity when constructing paths, it's recommended to use path.join() instead of string concatenation. This ensures that the correct path separator is used regardless of the operating system.

Suggested change

	add_plugindirs(os.projectdir() .. "/plugins")
	add_plugindirs(path.join(os.projectdir(), "plugins"))