feat(editor): try snap-indent as a replacement for yank-indent

Currently trying via my own fork of snap-indent, which has a PR pending.

core/siren-core-modules.el

@@ -45,6 +45,7 @@
 (require 'siren-rainbow)
 (require 'siren-recentf)
 (require 'siren-savehist)
+(require 'siren-snap-indent)
 (require 'siren-subword)
 (require 'siren-symbol-overlay)
 (require 'siren-undo-fu)
@@ -53,7 +54,6 @@
 (require 'siren-vundo)
 (require 'siren-which-key)
 (require 'siren-whitespace)
-(require 'siren-yank-indent)
 
 ;; Completion Systems and Interfaces
 (require 'siren-vertico)

core/siren-core-package-overrides.el

@@ -12,6 +12,9 @@
                 ;; features.
                 (all-the-icons-completion :type git :flavor melpa :host github :repo "iyefrat/all-the-icons-completion"
                                           :fork (:host github :repo "MintSoup/all-the-icons-completion"))
+                ;; Override snap-indent to use fork with more features.
+                (snap-indent :type git :flavor melpa :host github :repo "jeffvalk/snap-indent"
+                             :fork (:host github :repo "jimeh/snap-indent" :branch "various-features"))
                 ;; Override vertico recipe to fix issues with extensions.
                 (vertico :type git :host github :repo "minad/vertico"
                          :files (:defaults "extensions/*" (:exclude ".git")))))))

modules/editor/siren-snap-indent.el

@@ -0,0 +1,19 @@
+;;; siren-snap-indent.el --- jimeh's Emacs Siren: snap-indent configuration.
+
+;;; Commentary:
+
+;; Basic configuration for snap-indent.
+
+;;; Code:
+
+(use-package snap-indent
+  :hook
+  (prog-mode . snap-indent-mode)
+  (tex-mode . snap-indent-mode)
+
+  :custom
+  (snap-indent-yank-threshold 10000)
+  (snap-indent-yank-skip-indent-with-prefix-arg t))
+
+(provide 'siren-snap-indent)
+;;; siren-snap-indent.el ends here