POEMS

when: when is a lisp macro

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(when COND BODY...)

If COND yields non-nil, do BODY, else return nil. When COND yields non-nil, eval BODY forms sequentially and return value of last one, or nil if there are none.

fboundp is a built-in function in `C source code’.

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(fboundp SYMBOL)

add-to-list is a compiled Lisp function in `subr.el’.

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(add-to-list LIST-VAR ELEMENT &optional APPEND COMPARE-FN)

Add ELEMENT to the value of LIST-VAR if it isn’t there yet. The test for presence of ELEMENT is done with equal, or with COMPARE-FN if that’s non-nil. If ELEMENT is added, it is added at the beginning of the list, unless the optional argument APPEND is non-nil, in which case ELEMENT is added at the end.

The return value is the new value of LIST-VAR.

provide is a built-in function in `C source code’.

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(provide FEATURE &optional SUBFEATURES)

Announce that FEATURE is a feature of the current Emacs. The optional argument SUBFEATURES should be a list of symbols listing particular subfeatures supported in this version of FEATURE.

C-x h runs the command mark-whole-buffer

C-w runs the command kill region

use C-x <right>, C-x <left> to cycle around in the buffer ring.

iswitchb-mode replaces the default C-x b behaviour with a very intuitive buffer-switching-with-completion system.

The related commands are C-x b, C-s and C-r.

Dired Mode 非常别扭，很多无用的快捷键。

emacs dired (Directory Editor)mode.

C-x d: enter dired mode(use M-x RET dired RET is quick too)

C-x 4 d: dired-other-window

C-x C-j: (dired-jump to current file)

q: quit

R to rename the file (or ‘dired-do-rename’).

C-x k RET to go back to the (renamed) buffer