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An alternate pattern-matching conditional for Elisp [LWN.net] (lwn.net)

Elisp Emacs pattern-matching conditional cond* pcase Richard Stallman community discourse

The article discusses the development and community discussions surrounding a new pattern-matching conditional, cond, in Emacs Lisp (Elisp), introduced by Richard Stallman as a simpler alternative to the existing pcase macro. It covers the motivations behind the effort, including the desire for simplification and better maintainability, as well as the extensive debates within the Emacs community regarding the necessity, design, and implementation of cond. Highlighted are the various viewpoints on cond*’s inclusion, its advantages over pcase, and the political considerations influencing its adoption. The article emphasizes the importance of community consensus and cooperation in the evolution of Emacs.
Main Points
- Development of cond* by Richard StallmanRichard Stallman's development of a new pattern-matching conditional, cond*, aims to simplify and clarify pattern-matching in Elisp, offering a simpler alternative to the complex pcase.
- Community discussions on cond*The emacs-devel mailing list has been a platform for extensive discussions on the necessity, design, and implications of introducing cond* as an alternative to pcase.
- Stallman's approach to simplificationStallman's approach to developing cond* focuses on avoiding the complexity of pcase by combining the cond and let constructs, aiming for a more intuitive pattern-matching mechanism.
- Debates on implementation and impactThe addition of cond* to Emacs has spurred debates about its implementation, documentation, and potential impact, highlighting differing opinions within the Emacs community.
- Influence of political considerationsPolitical considerations and the aim to maintain a cohesive community influenced the decision to incorporate cond* into Emacs, reflecting the importance of consensus among contributors.
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