54 lines
2.2 KiB
EmacsLisp
54 lines
2.2 KiB
EmacsLisp
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;;; Enhanced beginning- and end-of-buffer in special mode buffers (dired etc.)
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;; https://fuco1.github.io/2017-05-06-Enhanced-beginning--and-end-of-buffer-in-special-mode-buffers-(dired-etc.).html
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(defmacro fuco1-special-beginning-of-buffer (mode &rest forms)
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"Define a special version of `beginning-of-buffer' in MODE.
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The special function is defined such that the point first moves
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to `point-min' and then FORMS are evaluated. If the point did
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not change because of the evaluation of FORMS, jump
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unconditionally to `point-min'. This way repeated invocations
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toggle between real beginning and logical beginning of the
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buffer."
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(declare (indent 1))
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(let ((fname (intern (concat "my-" (symbol-name mode) "-beginning-of-buffer")))
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(mode-map (intern (concat (symbol-name mode) "-mode-map")))
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(mode-hook (intern (concat (symbol-name mode) "-mode-hook"))))
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`(progn
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(defun ,fname ()
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(interactive)
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(let ((p (point)))
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(goto-char (point-min))
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,@forms
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(when (= p (point))
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(goto-char (point-min)))))
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(add-hook ',mode-hook
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(lambda ()
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(define-key ,mode-map
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[remap beginning-of-buffer] ',fname))))))
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(defmacro fuco1-special-end-of-buffer (mode &rest forms)
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"Define a special version of `end-of-buffer' in MODE.
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The special function is defined such that the point first moves
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to `point-max' and then FORMS are evaluated. If the point did
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not change because of the evaluation of FORMS, jump
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unconditionally to `point-max'. This way repeated invocations
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toggle between real end and logical end of the buffer."
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(declare (indent 1))
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(let ((fname (intern (concat "my-" (symbol-name mode) "-end-of-buffer")))
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(mode-map (intern (concat (symbol-name mode) "-mode-map")))
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(mode-hook (intern (concat (symbol-name mode) "-mode-hook"))))
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`(progn
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(defun ,fname ()
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(interactive)
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(let ((p (point)))
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(goto-char (point-max))
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,@forms
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(when (= p (point))
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(goto-char (point-max)))))
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(add-hook ',mode-hook
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(lambda ()
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(define-key ,mode-map
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[remap end-of-buffer] ',fname))))))
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