Table of Contents

• Bookmarks
• Emacs
  • Indirect Buffers
  • Regex
• Tips
  • Searching
  • Save/Load layouts and workspaces
• Layers
  • How :variables in dotspacemacs-configuration-layers works
  • auto-completion
  • csharp
  • restclient
• Customization
  • Visual Pastes
  • EditorConfig
• Use Cases
  • How to Fix 'Evaluation of code disabled'
• How-to
  • Enable navigation by visual lines?

Bookmarks

• Initiate with SPC f b

Emacs

Indirect Buffers

An indirect buffer shares the text of some other buffer, which is called the base buffer of the indirect buffer. In some ways it is a buffer analogue of a symbolic link between files.

Regex

• https://www.emacswiki.org/emacs/RegularExpression

Emacs Regex engine specialties:

\ca      ascii character
\Ca      non-ascii character (newline included)
\cl      latin character
\cg      greek character

\s-   whitespace character        \s/   character quote character
\sw   word constituent            \s$   paired delimiter
\s_   symbol constituent          \s'   expression prefix
\s.   punctuation character       \s<   comment starter
\s(   open delimiter character    \s>   comment ender
\s)   close delimiter character   \s!   generic comment delimiter
\s"   string quote character      \s|   generic string delimiter
\s\   escape character

[-+[:digit:]]                     digit or + or - sign
\(\+\|-\)?[0-9]+\(\.[0-9]+\)?     decimal number (-2 or 1.5 but not .2 or 1.)
\<\(\w+\) +\1\>             two consecutive, identical words
\<[[:upper:]]\w*               word starting with an uppercase letter
 +$                               trailing whitespaces (note the starting SPC)
\w\{20,\}                         word with 20 letters or more
\w+phony\>                     word ending by phony
\(19\|20\)[0-9]\{2\}              year 1900-2099
^.\{6,\}                          at least 6 symbols
^[a-zA-Z0-9_]\{3,16\}$            decent string for a user name
<tag[^> C-q C-j ]*>\(.*?\)</tag>  html tag

Tips

Searching

I want non-fuzzy searches sometimes. I tried to set dotspacemacs-helm-use-fuzzy to nil, but I couldn't recognize obvious changes. Instead, I found that escaping all whitespaces(use \_, instaned of _) seems to work as expected.

Save/Load layouts and workspaces

Save

SPC l s

Load

SPC l L

Layers

How :variables in dotspacemacs-configuration-layers works

• You can safely set variables for layers with :variables.
• It will work like using (setq-default).

auto-completion

YASnippet

1. Configuration

   '((auto-completion :variables
                      auto-completion-private-snippets-directory "~/.dotfiles/spacemacs/snippets")

2. Organization

   snippets
   |-- c-mode
   |   |-- .yas-parents    # contains "cc-mode text-mode"
   |   `-- printf
   |-- cc-mode
   |   |-- for
   |   `-- while
   |-- java-mode
   |   |-- .yas-parents    # contains "cc-mode text-mode"
   |   `-- println
   `-- text-mode
       |-- email
       `-- time
   

   • https://joaotavora.github.io/yasnippet/snippet-organization.html

3. Writing

   # name: mysnippet
   # key: my_
   # --
   ${1:$(make-string (string-width yas-text) ?\=)}
   ${1:Title}
   ${1:$(make-string (string-width yas-text) ?\=)}
   
   - (${1:id})${2:foo}
   {
       return $2;
   }
   
   - (void)set${2:$(capitalize yas-text)}:($1)aValue
   {
       [$2 autorelease];
       $2 = [aValue retain];
   }
   $0
   

   • The lines above # -- is meta
   • $1 or ${1} is a tapstop
   • ${1:<something>} for specifying a default value
   • $0 is the exit point
   • A tapstop can show up multiple times, which mirrors the first occurance
   • Mirrors can be transformed with ${2:$(elisp-code), with yas-text place holder
   • https://joaotavora.github.io/yasnippet/snippet-development.html

csharp

• SPC m s s to start omnisharp
• Select *.sln file on the project root for unity3d

brew install omnisharp/omnisharp-roslyn/omnisharp-mono

restclient

• Lines starting with # are considered comments AND also act as separators.
• SPC m s to send
• SPC m y to copy as curl command

GET https://api.github.com

#

POST https://api.github.com
Content-Type: application/json

{
  "key": "value"
}

ob-http

#+BEGIN_SRC http :pretty
GET https://api.github.com/repos/zweifisch/ob-http/languages
Accept: application/vnd.github.moondragon+json
#+END_SRC

#+RESULTS:
: {
:   "Emacs Lisp": 8170
: }

Customization

Visual Pastes

Enable evil-visual pastes from system clipbaoard

(fset 'evil-visual-update-x-selection 'ignore)

Support multiple visual pastes. It's NOT recommended if you use cut and paste routine.

(defun evil-paste-after-from-0 ()
  (interactive)
  (let ((evil-this-register ?0))
    (call-interactively 'evil-paste-after)))

(define-key evil-visual-state-map "p" 'evil-paste-after-from-0)

EditorConfig

It seems that Spacemacs uses EditorConfig implicitly. To make it explicit:

dotspacemacs-additional-packages '(editorconfig)

(defun dotspacemacs/user-config ()
  (editorconfig-mode 1)
)

Use Cases

How to Fix 'Evaluation of code disabled'

• Simply run :spacemacs/recompile-elpa and restart emacs

How-to

Enable navigation by visual lines?

Add the following snippet to your dotspacemacs/user-config function:

;; Make evil-mode up/down operate in screen lines instead of logical lines
(define-key evil-motion-state-map "j" 'evil-next-visual-line)
(define-key evil-motion-state-map "k" 'evil-previous-visual-line)
;; Also in visual mode
(define-key evil-visual-state-map "j" 'evil-next-visual-line)
(define-key evil-visual-state-map "k" 'evil-previous-visual-line)