chore(editor): extract recentf, savehist and uniquify to seperate modules

modules/editor/siren-recentf.el

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+;;; siren-recentf.el --- jimeh's Emacs Siren: recentf configuration.
+
+;;; Commentary:
+
+;; Basic configuration for recentf.
+
+;;; Code:
+
+(use-package recentf
+  :straight (:type built-in)
+  :demand t
+
+  :custom
+  (recentf-save-file (expand-file-name "recentf" siren-cache-dir))
+  (recentf-max-saved-items 5000)
+  (recentf-max-menu-items 1000)
+  (recentf-auto-cleanup 'never)
+  (recentf-exclude '("\\.git.*" "\\.hg.*" "\\.svn.*"))
+
+  :init
+  (defun siren-recentf-exclude-p (file)
+    "A predicate to decide whether to exclude FILE from recentf."
+    (let ((file-dir (file-truename (file-name-directory file))))
+      (-any-p (lambda (dir)
+                (string-prefix-p dir file-dir))
+              (mapcar 'file-truename (list siren-cache-dir package-user-dir)))))
+
+  :config
+  (add-to-list 'recentf-exclude 'siren-recentf-exclude-p)
+  (recentf-mode +1))
+
+(provide 'siren-recentf)
+;;; siren-recentf.el ends here

modules/editor/siren-savehist.el

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+;;; siren-savehist.el --- jimeh's Emacs Siren: savehist configuration.
+
+;;; Commentary:
+
+;; Basic configuration for savehist.
+
+;;; Code:
+
+(use-package savehist
+  :straight (:type built-in)
+
+  :custom
+  (savehist-additional-variables '(search-ring regexp-search-ring))
+  (savehist-autosave-interval 60)
+  (savehist-file (expand-file-name "savehist" siren-cache-dir))
+
+  :init
+  (savehist-mode +1))
+
+(provide 'siren-savehist)
+;;; siren-savehist.el ends here

modules/editor/siren-uniquify.el

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+;;; siren-uniquify.el --- jimeh's Emacs Siren: uniquify configuration.
+
+;;; Commentary:
+
+;; Basic configuration for uniquify.
+
+;;; Code:
+
+(use-package uniquify
+  :straight (:type built-in)
+  :demand t
+
+  :custom
+  (uniquify-buffer-name-style 'post-forward-angle-brackets)
+  (uniquify-separator "/")
+  ;; rename after killing uniquified
+  (uniquify-after-kill-buffer-p t)
+  ;; don't muck with special buffers
+  (uniquify-ignore-buffers-re "^\\*"))
+
+(provide 'siren-uniquify)
+;;; siren-uniquify.el ends here