A series of notes that I learn Emacs hacking. Org-capture, org-pomodoro; file encoding with utf-8; batch rename files in dired mode, seach and replace with helm-ag; flycheck; snippets auto complete.

Use org-capture to take notes

• A module in org-mode. We can customize the template to make it easier to use.
• Configuration of the template.

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(setq org-capture-templates
      '(("t" "Todo" entry (file+headline "D:/Dropbox/AGDA/Orz.org" "Agenda")
	 "* TODO [#B] %?\n %i\n"
	 :empty-line 1)))

• Use C-c C-s to add timestamp to the TODO item. Enter a time to schedule.
• Use C-a a to view the scheduled TODO list. Remember to set the location value of the org-agenda-files.

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(setq org-agenda-files '("D:/Dropbox/AGDA"))

• org-pomodoro: A package to track the time. Pomodoro Technique.
• M-x org-pomodoro: Execute this command to start 25-min clock counter.

Miscellaneous optimization

• Change the default buffer encoding. So that in case we type some Chinese characters, the coding of the buffer will becomes “UTF-8”. And we don’t need to bother again typing the encoding when we save that file.

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(set-language-environment "UTF-8")

• Insert current url of the first activate tab in Chrome (This is only achieved in Mac in the video). Try to implement that in Windows.
• Use C-n and C-p instead of M-n, M-p to select the candidates in company-mode:

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(with-eval-after-load 'company
  (define-key company-active-map (kbd "M-n") nil)
  (define-key company-active-map (kbd "M-p") nil)
  (define-key company-active-map (kbd "C-n") #'company-select-next)
  (define-key company-active-map (kbd "C-p") #'company-select-previous))

Batch rename files in dired mode

• Use C-x C-q in dired mode. The major mode becomes Editable Dired.
• Use expand-region and iedit to batch change files.
• Use C-; to enter iedit mode. And then we can change the filename all together.
• Use C-c C-c to save the buffer to confirm the changes.

Search and replace (Important)

• Use helm-ag: install ag first

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brew install the_silver_searcher
apt-get install silversearcher-ag

• Search speed: ag > pt > ack > grep
• Not quite convenient on Windows.
• Why not using helm in Emacs? helm loads slower than ivy. However, helm-ag is an exception.
• M-x helm-do-ag-project-root: find the occurence of certain keyword in the projoct directory.
• We can bind a key to it. (C-c p s).
• type ! to eliminate the undesired results.
• In the result buffer, press C-c C-e enter editing mode.
• Use similar things in previous section (Batch rename) to change everything at once!

Use flycheck to highlight typos

• eslint for JavaScript.
• Install flycheck package.
• enable it globally: (global-flycheck-mode)
• Use M-x flycheck-verify-setup to show the candidate flychecker module available.
• Add more module to support more programming language.
• Option: Add hook to enable it only in programming mode instead of global mode.

About snippets.

yasnippet package

• Called yasnippets.
• It can help us to enter some commonly used code snippets, such as for, while, if-else.
• For more details, find the YASnippets menu on the top in programming mode.

auto-yasnippet package

• Use ~ to make the template. At that line, call aya-create.
• At the new line, call aya-expand, then we create a template that has multiple cursors marked at the previous ~ point. Type in the stuff you want and create a new sentence.