How to Kill a "Visible" Buffer Quickly in Emacs

Selecting Emacs windows using ace-window Recently I've been building a simple Emacs config for myself, along the way I re-discovered some fantastic packages, for example, I found that ace-window is a simple yet powerful package to enhance the default other-window command to select other windows quickly when it has more than two windows in a frame. I replaced the key binding of other-window to ace-window by simply doing (global-set-key (kbd "C-x o") #'ace-window), then when there are >2 windows, it will show a white-in-red number at the top-left corner for every window, hit the number (1, 2, 3, …) and then Emacs will select the corresponding window (as demonstrated in the above screenshot). [Read More]

How to append items to the CSV file without header row?

Scrapy Architecture Scrapy provides a few item exporters by default to export items in commonly used file formats like CSV/JSON/XML. I usually use CSV to export items, it is pretty convenient, and it comes in two ways: appending mode, for example, scrapy crawl foo -o test.csv overwriting mode with -O option, like scrapy crawl foo -O test.csv But in the appending mode, it's a bit annoying that it always appends the header row before the newly scraped items, which is not correctly in terms of CSV format. [Read More]

Eglot for Better Programming Experience in Emacs

LSP, or Language Server Protocol, makes programming easier by introducing features like more precise auto-completion and definition lookup. It may have scratched your itches, and you may wonder what the experience is like in Emacs. Emacs has mainly two LSP clients out there, eglot and lsp-mode. Eglot is lightweight, and it could almost run out of the box. So in this post I will briefly show you how to use eglot. [Read More]

How to Reload i3status config On the Fly

Sometimes I want to change the status (i3status) of i3wm temporarily, but it seems that i3wm doesn't support it directly, although reloading the config for i3wm itself is a piece of cake (bindsym $mod+Shift+c reload in the config, or i3-msg -t command reload in the command line). But this issue scratched my itch, and I swear that I must solve it today. Following this Reddit post, it looks like it can be done by restarting the process of i3bar: [Read More]
i3wm  Linux 

Language Shadowing with subed in Emacs

So I'm trying to improve my English speaking skill by shadowing while watching TV episodes. The workflow before was to loop over video clips using mpv: hit l to mark the start of the loop play the video and wait for it to be at the end of the loop hit l again to mark the end Then mpv will loop over the clip, it basically works, but it's a bit hard and tedious to set the start and end precisely. [Read More]

Writing a Python Script in Emacs in 45 Minutes!

Note: watch my live coding session of this article: Intro If you've heard some rumors of Emacs that it has a very steep learning curve (or that Emacs makes a computer slow), you may be too scared to look at it. It indeed has some learning curve (learning anything does have one), but it isn't very steep. I learned this after getting my hands dirty with Emacs a few years ago. [Read More]

Beautiful Soup 4 Cheatsheet

Beautiful Soup Detailed docs: the Beautiful Soup 4 Docs. Assume t is an object of Tag. Core concepts (classes) Tag, a Tag object corresponds to an XML or HTML tag. BeautifulSoup, the BeautifulSoup object represents the parsed document as a whole. You can treat it like a special Tag. It needs a parser to parse the document, a built-in parser is "html.parser", e.g. soup = BeautifulSoup("<html>a web page</html>", 'html.parser') NavigableString, a string corresponds to a bit of text (as you see it in the browser) within a tag. [Read More]

Clojure reduce: one case for text processing

As a practice, I managed to illustrate Clojure files using illustrate.clj, but my original idea was to annotate org-mode files of blogs. It's not uncommon that a blog post has some code snippets. But it missed the feature until last night, as I wasn't sure how to implement it appropriately before and didn't have enough time. For example, I may have an org-mode like this: sum of two numbers: #+begin_src clojure (+ 1 2) #+end_src I want to have a result comment ((;; => 3)) after each top-level form after using illustrate. [Read More]

illustrate.clj to Illustrate Clojure Snippet

To get my hands dirty with Clojure, I am trying to find or implement Clojure's string functions in the sense of Python. Python has powerful string APIs, and I also want to see how powerful Clojure could be in this field. That would be interesting. As shown in the cheatsheet, Clojure has implemented most of them, and there are some that I have to implement myself, like title-case. Along the way, I found it was a little cumbersome to append the evaluation result and the result of calling them, for example, [Read More]

String Title Case in Clojure

These days I like to write scripts for some tasks in Python instead of shell. One important reason I think that's because Python is powerful at string manipulation. Recently I'm learning Clojure, and I'm trying to find similar ways in Clojure, one of them is s.title() for getting a title-cased version of a string. For example, >>> ' Hello world'.title() ' Hello World' How to do that in Clojure? To make the problem simple, let's assume that the input string only has letters and spaces, that is, [a-zA-Z ] in regex pattern. [Read More]