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<h1><a class="header" href="#emacs1" id="emacs1">emacs(1)</a></h1>
<h2><a class="header" href="#help" id="help">help</a></h2>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#package-manager" id="package-manager">package manager</a></h2>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#window" id="window">window</a></h2>
<pre><code class="language-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)
</code></pre>
<h2><a class="header" href="#buffer" id="buffer">buffer</a></h2>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#ibuffer" id="ibuffer">ibuffer</a></h2>
<p>Builtin advanced buffer selection mode</p>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#isearch" id="isearch">isearch</a></h2>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#occur" id="occur">occur</a></h2>
<pre><code class="language-markdown"> key fn description
-----------------------------------
M-s o occur get matches for regexp in buffer
use during `isearch` to use current search term
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
</code></pre>
<pre><code class="language-markdown"> key fn description
---------------------------------------------------------
multi-occur-in-matching-buffers run occur in buffers matching regexp
</code></pre>
<h2><a class="header" href="#grep" id="grep">grep</a></h2>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#yankpaste" id="yankpaste">yank/paste</a></h2>
<pre><code class="language-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)
</code></pre>
<h2><a class="header" href="#register" id="register">register</a></h2>
<pre><code class="language-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>
</code></pre>
<h2><a class="header" href="#blockrect" id="blockrect">block/rect</a></h2>
<pre><code class="language-markdown"> key fn description
------------------------------------------------
C-x <SPC> rectangle-mark-mode activate rectangle-mark-mode
string-rectangle insert text in marked rect
</code></pre>
<h2><a class="header" href="#mass-edit" id="mass-edit">mass edit</a></h2>
<pre><code class="language-markdown"> key fn description
------------------------------------------------
C-x h mark-whole-buffer mark whole buffer
delete-matching-line delete lines matching regex
M-% query-replace search & replace
C-M-% query-replace-regexp search & replace regex
</code></pre>
<h2><a class="header" href="#narrow" id="narrow">narrow</a></h2>
<pre><code class="language-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)
</code></pre>
<h2><a class="header" href="#org" id="org">org</a></h2>
<pre><code class="language-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
</code></pre>
<h3><a class="header" href="#org-source" id="org-source">org source</a></h3>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#comapny" id="comapny">comapny</a></h2>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#tags" id="tags">tags</a></h2>
<p>To generate <code>etags</code> using <code>ctags</code></p>
<pre><code class="language-markdown"> ctags -R -e . generate emacs tag file (important `-e`)
</code></pre>
<p>Navigate using tags</p>
<pre><code class="language-markdown"> key fn description
-----------------------------------------------
xref-find-definitions find definition of tag
xref-find-apropos find symbols matching regexp
xref-find-references find references of tag
</code></pre>
<h2><a class="header" href="#lisp" id="lisp">lisp</a></h2>
<pre><code class="language-markdown"> key fn description
------------------------------
ielm open interactive elips shell
</code></pre>
<p>In <code>lisp-interaction-mode</code> (<code>*scratch*</code> buffer by defult)</p>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#ido" id="ido">ido</a></h2>
<p>Builtin fuzzy completion mode (eg buffer select, dired, ...).</p>
<pre><code class="language-markdown"> key fn description
------------------------------------------
ido-mode toggle ido mode
<Left>/<Right> cycle through available competions
<RET> select completion
</code></pre>
<h2><a class="header" href="#evil" id="evil">evil</a></h2>
<pre><code class="language-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
</code></pre>
<h2><a class="header" href="#dired" id="dired">dired</a></h2>
<pre><code class="language-markdown"> key fn description
--------------------------
i open sub-dir in same buffer
+ create new directory
C copy file/dir
q quit
</code></pre>
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