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60 lines
2.3 KiB
EmacsLisp
60 lines
2.3 KiB
EmacsLisp
;; *** narrowing (no mode but fits here)
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;; I use narrowing quite frequently, so here are some enhancements.
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;; easier narrowing with Indirect Buffers
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;; Source: [[https://www.emacswiki.org/emacs/NarrowIndirect3][emacswiki]]
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(require 'narrow-indirect)
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(defalias 'nf 'ni-narrow-to-defun-indirect-other-window)
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(defalias 'nr 'ni-narrow-to-region-indirect-other-window)
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;; I like to have an orange fringe background when narrowing is
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;; active, since I forget that it is in effect otherwise sometimes.
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;; via [[https://emacs.stackexchange.com/questions/33288/how-to-find-out-if-narrow-to-region-has-been-called-within-save-restriction][stackoverflow]]
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(defun tvd-narrowed-fringe-status ()
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"Make the fringe background reflect the buffer's narrowing status."
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(set-face-attribute
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'fringe nil :background (if (buffer-narrowed-p)
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tvd-fringe-narrow-bg
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nil)))
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(add-hook 'post-command-hook 'tvd-narrowed-fringe-status)
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;; via https://endlessparentheses.com/emacs-narrow-or-widen-dwim.html
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;; pure genius, never ever have to think about how to widen
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(defun narrow-or-widen-dwim (p)
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"Widen if buffer is narrowed, narrow-dwim otherwise.
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Dwim means: region, org-src-block, org-subtree, or
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defun, whichever applies first. Narrowing to
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org-src-block actually calls `org-edit-src-code'.
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With prefix P, don't widen, just narrow even if buffer
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is already narrowed."
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(interactive "P")
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(declare (interactive-only))
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(cond ((and (buffer-narrowed-p) (not p)) (widen))
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((region-active-p)
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(narrow-to-region (region-beginning)
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(region-end)))
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((derived-mode-p 'org-mode)
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;; `org-edit-src-code' is not a real narrowing
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;; command. Remove this first conditional if
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;; you don't want it.
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(cond ((ignore-errors (org-edit-src-code) t)
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(delete-other-windows))
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((ignore-errors (org-narrow-to-block) t))
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(t (org-narrow-to-subtree))))
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((derived-mode-p 'latex-mode)
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(LaTeX-narrow-to-environment))
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(t (narrow-to-defun))))
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;; This line actually replaces Emacs' entire narrowing
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;; keymap, that's how much I like this command. Only
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;; copy it if that's what you want.
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(define-key ctl-x-map "n" #'narrow-or-widen-dwim)
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(provide 'init-narrow)
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;;; init-narrow.el ends here
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