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# emacs(1)
## help
```markdown
C-h ? list available help modes
C-h e show message output (`*Messages*` buffer)
C-h f describe function
C-h v describe variable
C-h w describe which key invoke function (where-is)
C-h c <KEY> print command bound to <KEY>
C-h k <KEY> describe command bound to <KEY>
C-h b list buffer local key-bindings
<kseq> C-h list possible key-bindings with <kseq>
eg C-x C-h -> list key-bindings beginning with C-x
```
## package manager
```markdown
key fn description
------------------------------------------------
package-refresh-contents refresh package list
package-list-packages list available/installed packages
`U x` to mark packages for Upgrade & eXecute
```
## window
```markdown
key fn description
----------------------------------------------
C-x 0 delete-window kill focused window
C-x 1 delete-other-windows kill all other windows
C-x 2 split-window-below split horizontal
C-x 3 split-window-right split vertical
C-x o other-window other window (cycle)
```
## minibuffer
```markdown
key description
----------------------------
M-e enter edit minibuffer edit mode
M-up focus previous completion
M-down focus next completion
M-ret select focused completion
```
## buffer
```markdown
key fn description
---------------------------------------------
C-x C-q read-only-mode toggle read-only mode for buffer
C-x k kill-buffer kill buffer
C-x s save-some-buffers save buffer
C-x w write-file write buffer (save as)
C-x b switch-to-buffer switch buffer
C-x C-b list-buffers buffer list
```
## ibuffer
Builtin advanced buffer selection mode
```markdown
key fn description
--------------------------------------
ibuffer enter buffer selection
h ibuffer help
o open buffer in other window
C-o open buffer in other window keep focus in ibuffer
s a sort by buffer name
s f sort by file name
s v sort by last viewed
s v sort by major mode
, cycle sorting mode
= compare buffer against file on disk (if file is dirty `*`)
/m filter by major mode
/n filter by buffer name
/f filter by file name
// remove all filter
/g create filter group
/\ remove all filter groups
```
## goto navigation
```markdown
key fn description
----------------------------------------
M-g g goto-line go to line
M-g M-n next-error go to next error (grep, xref, compilation, ...)
M-g M-p previous-error go to previous error
M-g i imenu go to place in buffer (symbol, ...)
```
## isearch
```markdown
key fn description
-------------------------------------------------
C-s isearch-forward search forward from current position (C-s to go to next match)
C-r isearch-backward search backwards from current position (C-r to go to next match)
C-w isearch-yank-word-or-char feed next word to current search (extend)
M-p isearch-ring-advance previous search input
M-n isearch-ring-retreat next search input
M-e isearch-edit-string edit search string again
M-s o occur open search string in occur
```
## occur
```markdown
key fn description
-----------------------------------
M-s o occur get matches for regexp in buffer
use during `isearch` to use current search term
e enter occur edit mode (C-c C-c to quit)
n move to next entry and keep focus in occur buffer
p move to previous entry and keep focus in occur buffer
C-n goto next line
C-p goto previous line
o open match in other window
C-o open match in other window keep focus in ibuffer
```
```markdown
key fn description
---------------------------------------------------------
multi-occur-in-matching-buffers run occur in buffers matching regexp
```
## grep
```markdown
key fn description
-----------------------------------
rgrep recursive grep
find-grep run find-grep result in *grep* buffer
n/p navigate next/previous match in *grep* buffer
q quit *grep* buffer
```
## yank/paste
```markdown
key fn description
---------------------------------------------
C-<SPACE> set-mark-command set start mark to select text
M-w kill-ring-save copy selected text
C-w kill-region kill selected text
C-y yank paste selected text
M-y yank-pop cycle through kill-ring (only after paste)
```
## register
```markdown
key fn description
------------------------------------------------
C-x r s <reg> copy-to-register save region in register <reg>
C-x r i <reg> insert-register insert content of register <reg>
```
## bookmarks
```
key fn description
-------------------------------------------
C-x r m bookmark-set set a bookmark
C-x r b bookmark-jump jump to a bookmark
C-x r l bookmark-bmenu-list list all bookmarks
```
## block/rect
```markdown
key fn description
------------------------------------------------
C-x <SPC> rectangle-mark-mode activate rectangle-mark-mode
string-rectangle insert text in marked rect
```
## mass edit
```markdown
key fn description
------------------------------------------------
C-x h mark-whole-buffer mark whole buffer
delete-matching-line delete lines matching regex
replace-string replace unconditional
M-% query-replace search & replace
C-M-% query-replace-regexp search & replace regex
```
## narrow
```markdown
key fn description
---------------------------------------------
C-x n n narrow-to-region show only focused region (narrow)
C-x n w widen show whole buffer (wide)
```
## org
```markdown
key fn description
------------------------------------
M-up/M-down re-arrange items in same hierarchy
M-left/M-right change item hierarchy
C-RET create new item below current
C-S-RET create new TODO item below current
S-left/S-right cycle TODO states
```
### org source
```markdown
key fn description
------------------------------
<s TAB generate a source block
C-c ' edit source block (in lang specific buffer)
C-c C-c eval source block
```
## project
```markdown
key fn description
----------------------------------------------------------
C-x p p project-switch-project switch project
C-x p f project-find-file find file in project
C-x p r project-query-replace-regexp query replace on project
C-x p x project-execute-extended-command exec command on project
C-x p ! project-shell-command shell command on project
C-x p & project-async-shell-command async shell command on project
```
## company
```markdown
key fn description
-------------------------------
C-s search through completion candidates
C-o filter completion candidates based on search term
<f1> get doc for completion condidate
M-<digit> select completion candidate
```
## tags
To generate `etags` using `ctags`
```markdown
ctags -R -e . generate emacs tag file (important `-e`)
```
Navigate using tags
```markdown
key fn description
-----------------------------------------------
M-. xref-find-definitions find definition of tag
(C-u prefix to enter symbol manually)
xref-find-apropos find symbols matching regexp
M-? xref-find-references find references of tag
```
## lisp
```markdown
key fn description
------------------------------
ielm open interactive elips shell
```
In `lisp-interaction-mode` (`*scratch*` buffer by defult)
```markdown
key fn description
-----------------------------------------------------------
C-j eval-print-last-sexp evaluate & print preceeding lisp expr
C-x C-e eval-last-sexp evaluate lisp expr
C-u C-x C-e eval-last-sexp evaluate & print
C-c C-e elisp-eval-region-or-buffer eval buffer or region (elisp mode)
```
## ido
Builtin fuzzy completion mode (eg buffer select, dired, ...).
```markdown
key fn description
------------------------------------------
ido-mode toggle ido mode
<Left>/<Right> cycle through available competions
<RET> select completion
```
There is also `fido`, which is the successor of `ido`, which also
supports `fido-vertical-mode` in case vertical mode is preferred.
## evil
```markdown
key fn description
--------------------------
C-z toggle emacs/evil mode
C-^ toggle between previous and current buffer
C-p after paste cycle kill-ring back
C-n after paste cycle kill-ring forward
```
## dired
```markdown
key fn description
--------------------------
i open sub-dir in same buffer
+ create new directory
C copy file/dir
R move file/dir (rename)
S absolute symbolic link
Y relative symbolic link
d mark for deletion
m mark file/dir
u un-mark file/dir
U un-mark all
x execute marked actions
q quit
```
## info
```markdown
key fn description
---------------------------------------
n Info-next next page
p Info-prev previous page
l Info-history-back history go back
r Info-history-forward history go forward
^ Info-Up up in info node tree
m Info-menu goto menu (by minibuf completion)
s Info-search search info
g Info-goto-node goto info node (by minibuf completion)
Info-history open info history in buffer
```
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