#+title: Emacs
#+date: [2023-09-02 Sat]
#+startup: indent

* Org mode shortcuts
** Dates:
- active timestamps :: C-c .
  creates an entry in the agenda
- inactive timestamps :: C-c !
  doesn´t create an entry in the agenda
- link :: [[https://orgmode.org/orgguide.html#Timestamps][timestamps]]

** Links:
- create link :: C-c C-l
- link :: [[https://orgmode.org/orgguide.html#Hyperlinks][hyperlinks]]

** Tables
- display cells references :: C-c }
- display ref for that cell :: C-c ?
  references are =@ROW$COLUMN=
- link :: [[https://orgmode.org/manual/References.html][table references]]
- formula :: =@I..II=
  select all the rows between horizontal lines (hline) 1 and 2
  =vmean(@I..II);EN= column range mean, treats empty values as null (0)

* Config
In your ~init~ file

** Listing buffers
- List buffer :: =C-x C-b=
  Classic version
- List Buffer Better :: =M-x ibuffer=
  Way better


To overwrite the classic shortcut with the better version:
#+begin_src elisp
  (global-set-key [remap list-buffers] 'ibuffer)
#+end_src


* Info Manual
- C-h i

** Shortcuts and Keys
- [, ] :: Previous and Next *node*
- l, r :: Back and Forward in *history*
- n, p :: Previous and Next *sibling node*
- u    :: Up one level to a *parent node*
- SPC  :: Scroll (browse) one screen at a time, natural reading
- TAB  :: Cycles through cross-references and links
- RET  :: Opens the active link
- m    :: Search, Prompts for a menu item name and opens it
- q    :: Closes the info browser

** TODO Do the tutorial
- C-h i
- getting started

** TODO Do the EINTR
- C-h R :: Open a manual
- ~eintr~ An Introduction to Programming in Emacs Lisp


* File-local variables

** Format
Looks like this
#+name: file-local variables *header*
#+begin_src org
-*- mode: mode-name-here; my-variable: value -*-
#+end_src

#+name: file-local variables *footer*
#+begin_src org
Local Variables:
mode: mode-name
my-variables: value
End:
#+end_src

** Shortcut
Doesn't seem to have any shortcuts.
The commands are:
- ~M-x add-file-local-variable-prop-line~
- ~M-x add-file-local-variable~

** Shebangs (Program loader)
Classic shell shebangs also sets the major mode
as long as it's listed in ~interpreter-mode-alist~

** Magic mode
Using the variable in the beginning of the file
#+begin_src org
#+magic-mode-alist: mode-name
#+end_src

* Other Window command shortcuts
The *other* window is the next window that will be on focus with ~C-x o~
You can execute command in that window instead of the one that has the current focus.
The shorcuts start with ~C-x 4~ and mirror the commands applied to the current window ~C-x~
- ~C-x 4 C-f~ :: Finds a file in the other window
- ~C-x 4 d~   :: Opens ~dired-mode~ in the other window
- ~C-x 4 C-o~ :: Displays a buffer in the other window
- ~C-x 4 b~   :: Switches the buffer in the other window
  and make it the active window
- ~C-x 4 0~   :: Kills the buffer *and* window
- ~C-x 4 p~   :: Run project command in the other window


The same commands work in an other *frame* using ~5~ instead of ~4~

* Bookmark tab
You can bookmark *windown configurations* equivalent to a *workspace* in some
other editors.

** Shortcuts
- ~C-x t 2~ :: Create a new tab
- ~C-x t r~ :: Rename current tab
- ~C-<TAB>~ :: Cicle through the tabs
- ~C-x t RET~ :: Select tab by name
- ~C-x t 0~ :: Close current tab
- ~C-x t d~ :: Open dired mode in another tab