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a lot of changes at once
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Thomas Ruoff
276
emacs.org
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276
emacs.org
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@@ -0,0 +1,276 @@
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To get a list of packages type ~M-x list-packages~
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* Intersting learnings
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** Help systems
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~SPC h RET~ emacs manual
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~C-h a~ appropos
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~C-h l~ list 300 last keystrokes with description
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~C-h m~ docs to major and minor modes activg
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~C-h k~ what does a keybinding X do
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~C-h w~ which keybinding is active for X
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* Elisp
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Following this [[http://ergoemacs.org/emacs/elisp.html][Practical Emacs Lisp]]
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** Basics
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*** Eval code block with ~C-c C-c~
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#+BEGIN_SRC elisp
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(+ 547 1)
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#+END_SRC
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#+RESULTS:
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: Result 548
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*** Eval last expression with ~C-x C-e~
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*** Printing with (message ...)
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#+BEGIN_SRC elisp
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(message "Result %S" (+ 547 1))
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#+END_SRC
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#+RESULTS:
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: Result 548
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*** Arithmetic
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Singel digit numbers as ~2.~ are integers. Use ~2.0~ for floats.
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#+BEGIN_SRC elisp
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(+ 4 5 1) ; 10
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(- 9 2) ; 7
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(- 9 2 3) ; 4
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(* 2 3) ; 6
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(* 2 3 2) ; 12
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;; integer part of quotient
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(/ 7 2) ; 3
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;; division
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(/ 7 2.0) ; 3.5
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;; mod, remainder
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(% 7 4) ; 3
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;; power; exponential
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(expt 2 3) ; 8
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;; int to float
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(float 3) ; 3.0
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(truncate 3.3) ; 3
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(floor 3.3) ; 3
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(ceiling 3.3) ; 4
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(round 3.4) ; 3
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#+END_SRC
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*** Convert string and numbers
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#+BEGIN_SRC elisp
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(string-to-number "547")
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(number-to-string 547)
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#+END_SRC
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*** True and False
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**** ~nil~ is false
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**** anything else is true,
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**** nil is equivalent to a empty list ~()~, so also false
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**** ~t~ is by convention true
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*** and/or/not
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#+BEGIN_SRC elisp
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(and t nil)
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(or t nil () t)
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(not (and t t))
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#+END_SRC
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*** comparing
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#+BEGIN_SRC elisp
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; numbers
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(< 3 4)
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(>=_ 3 4)
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(= 3 3.0000000000000000000000001)
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(/= 3 4) ; not equal
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;strings
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(equal "abc" "abc") ; checks
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(string-equal "string" "strings")
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(string-equal "symbol" 'symbol) ; can be used to compare string with symbol
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; generic equal - checks datatype and value
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(equal 3 3) ; t
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(equal 3 3.0) ; nil
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(not (equal 3 4)) ; t. general way to test inequality
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#+END_SRC
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*** variables
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**** global
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#+BEGIN_SRC elisp
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(setq x 1)
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(setq x 2 y 3 z -1)
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#+END_SRC
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**** local
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#+BEGIN_SRC elisp
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(let name "value")
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(let (name1 name2)
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(setq name1 "Gustav")
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(setq name2 "Gustl")
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(+ 40 2) ; return value, optional
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)
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; or even shorter
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(let ((name1 "Gustav") (name2 "Gustl"))
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"Gustav+Gustl" ; return value, optional
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)
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#+END_SRC
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*** if then else
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#+BEGIN_SRC elisp
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(if (< 3 2) "yay" "nay")
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(if (< 1 2) "yay") ; no else, nil
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; no else, clearer to use ~when~. All args executed.
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(when (< 1 2) (setq a 1) (setq b 2)) ; a=1 and b=2
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#+END_SRC
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#+RESULTS:
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: 2
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*** block of expressions
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Same as a code block in C-like languages ~{...}~
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#+BEGIN_SRC elisp
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(progn (message "a") (message "b"))
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#+END_SRC
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Often used inside ~if~
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#+BEGIN_SRC elisp
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(if something
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(progn ; true
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(message "something is t")
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(message "yay")
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)
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(progn ; else
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(message "something is nil")
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(message 'nai')
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)
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)
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#+END_SRC
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*** loops
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#+BEGIN_SRC elisp
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;; inserts Unicode chars 32 to 126
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(let ((x 32)))
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(let ((r "")))
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(while (< x 127)
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(setq r (concatenate 'string r (char-to-string x)))
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(setq x (+ x 1)))
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(message "%s" r)
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#+END_SRC
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#+RESULTS:
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: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
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* to research
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** backup file location configurable?
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** highlight line
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** git gutter needed
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** what the hell is that footer thing you cannot edit?
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** ~C-o~ does not open last file, not sure why yet
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** persistant undo possible?
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** helm/ivy - dash?
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Still trying to figure what use-case each of these tries to
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solve. I'm primarily looking for something that offers me an nice
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interface to deal with all kind of lists of elements, like files,
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buffers, commits, tags, grepper etc.
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I used to cover that all with vim.fzf and would again like to have
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something like that.
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Though it seems, that I just need some inteface for lists of any
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kind that I can easily fuzzy search.
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And other plugins to actually provide the content.
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** gruvbox-theme
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** which-key
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Seems great for learning the editor commands. But could also be
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distracting
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** magit
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** language server protocol
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Mainly for my JS work, but probably worth to look at something
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generic if there is something out there.
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** vim-unimpaired ?
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Couln't find something replicating unimpaired until now.
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Maybe I just need to roll most of these on my own
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** vim-abolish ?
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** ranger/dired-ranger
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** devdocs
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* installed packages
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** general
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*** editorconfig
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*** helm
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*** projectile
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*** magit
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** evil related
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*** evil
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evil uses "state" for the "modes" in vi. The term "mode" is already used in emacs
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for a set of key bindings for a cetrain sort of text. A "mode" may include custom
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bindings for evil states.
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The state is shown in the status bar.
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There is also an emacs state <E>, basically turn off evil, which you can
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toggle with 'C-z'.
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I've heard numerous times that people claim evil covers 99% of what they use in vim.
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[[evil-maps.el][~/.emacs.d/elpa/evil-20190729.704/evil-maps.el] is a good place
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to start looking if something does not work for you.
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*** evil-escape
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*** evil-leader
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I was first not sure if I should even start using the leader key
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as I did in my vim config, as it would again not bring me further
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in learning the standard key bindings vim offers.
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This is still a valid point, but I also feel it will slow me down
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quite a bit, now that I'm considering to switch to Emacs.
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So I'll start with using it, but keep it very high in my priorities
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to finally getting rid of it.
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This is pretty important, as I'm pretty sure that I'll still be using
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Vim in quite some remote systems.
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*** evil-surround
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*** evil-magit
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*** evil-org
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** org-mode related
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*** org-bullets
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UTF-8 bullets
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* considering packages
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** general
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"So now " it makes really fun to work like this
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#+BEGIN_SRC elisp
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(print "blup")
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#+END_SRC
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#+BEGIN_SRC lisp
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#+END_SRC
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** evil related
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*** evil-args
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*** evil-matchit
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*** evil-collection
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This seems to use vim like keybindings in most common emacs
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places. Not sure yet if this is a good idea.
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** org-mode related
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*** org-download
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image d"n'd
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*** org-gcal
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*** org-jira
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*** org-projectile
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*** org-pandoc
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*** org-reveal
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