Config modernization: startup tuning, completion polish, new modules#1456
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Raise the GC threshold during startup and restore a modest value afterwards, disable the tool bar via frame parameters, inhibit implied frame resizing, native-compile packages at install time, and fix the missing LANG locale in GUI Emacs on macOS.
Populate treesit-language-source-alist so users can install any missing grammar with treesit-install-language-grammar, and prefer the newer eglot-events-buffer-config over the obsolete eglot-events-buffer-size.
When eglot is the LSP client, install flycheck-eglot on demand and enable global-flycheck-eglot-mode so LSP diagnostics reach Prelude's Flycheck UI (eglot otherwise reports only through Flymake).
Enable vertico-directory (RET descends, DEL kills a path component), corfu-history-mode (recency sorting, persisted via savehist), and set consult-narrow-key to < for group narrowing.
New prelude-spell-checker defcustom selects flyspell (default) or jinx. When jinx is chosen it's installed on demand and enabled as a single global mode, and the per-buffer flyspell hooks stand down.
New prelude-whitespace-cleanup-style defcustom selects whitespace-cleanup (default, whole file) or ws-butler (edited lines only), the latter installed on demand and enabled per buffer.
Swift support via swift-ts-mode + sourcekit-lsp, and a MisTTY-based terminal module (pure elisp, rebinds C-c t). Register both in the sample module list, installation docs, per-module doc pages and the mkdocs nav.
Bind embark-act (C-.), embark-dwim (C-;) and embark-bindings (C-h B), plus embark-consult for exporting consult results into editable grep/occur buffers. Leave prefix-help-command to which-key and note the Flyspell key overlap in the docs.
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A batch of improvements backported from my personal Emacs config, all kept opt-in or default-preserving so existing users see no change unless they flip a new option or enable a new module.
Startup and defaults:
early-init.elthat bumps the GC threshold during startup (restoring a modest value afterwards), disables the tool bar via frame parameters, setsframe-inhibit-implied-resize, native-compiles packages at install time, and fixes the missingLANGlocale in GUI Emacs on macOS.treesit-language-source-alistso a missing grammar can be installed withM-x treesit-install-language-grammarinstead of hunting down repo URLs.prelude-lsp-clientiseglot, so LSP diagnostics actually show up in the Flycheck UI instead of only through Flymake.Completion stack (
prelude-vertico/prelude-corfu):vertico-directory(RET descends, DEL kills a path component),corfu-history-mode(recency sorting via savehist), and setconsult-narrow-keyto<.C-.,C-;,C-h B). which-key keeps owning prefix help; the Flyspell key overlap is documented.New options and modules:
prelude-spell-checkerto choose Flyspell (default) or jinx.prelude-whitespace-cleanup-styleto choose whole-filewhitespace-cleanup(default) or ws-butler (edited lines only).New
prelude-swift(swift-ts-mode + sourcekit-lsp) andprelude-mistty(pure-elisp terminal) modules.The commits are consistent with our contribution guidelines
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