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jdhao / blink_cursor.vim
Created January 18, 2022 14:27
Blink cursor for Nvim
jdhao /
Created January 8, 2021 15:08
chrome plugins I am using

OneTab allows us to save the currently opened Tabs in Chrome for later inspection. Even if Chrome is restarted, your tab history is not lost.

Vimium is the hacker's browser which brings Vim-like key bindings for quicker operations inside Chrome. A must have if you care about your precious time and speed.

jdhao /
Created March 11, 2020 10:28
Save image with quality parameter in OpenCV
import cv2
img = cv2.imread('test.jpg')
# specify the write parameter, can be found in
write_param = [cv2.IMWRITE_JPEG_QUALITY, 90, cv2.IMWRITE_JPEG_OPTIMIZE, 1]
cv2.imwrite("test_new.jpg", img, write_param)
# Reference
jdhao /
Last active December 16, 2019 06:46
There is a difference between random.choices() and random.sample() in Python

In python, random.choices() will select K items from a list with replacement, which means that there are may be duplicated items in the result list. If you want to select K random item from the list without duplication, you need to use random.sample() instead.

I wasted one hour debugging this issue and suddenly found the casue. Sad :[

jdhao / build.bat
Last active December 16, 2019 06:37
Create Markdown tags for use in tagbar, see also
pyinstaller --onefile --console
jdhao /
Created September 17, 2019 04:14
How to grep unicode character in command line

How do I grep unicode characters using its code point?

For example, if we want to grep a(unicode code point is u+0041), we can use the following trick:

grep "$(printf '\u0041')" my_file.txt


jdhao / gist:43d2d12c3d9e9e3cb31878f4452cb704
Created September 17, 2019 03:50
Host key verification failed

When log in to server, I see the following error message;

RSA host key for xxxx has changed and you have requested strict checking. Host key verification failed.

You can remove the offending host key from file ~/.ssh/known_hosts. For example, if line 1 includes the offending hosts info, just remove it:

sed -i.bak -e '1d' ~/.ssh/known_hosts
jdhao / en.utf-8.add
Created September 16, 2019 02:38
Nvim spell file
jdhao / utils.vim
Created September 12, 2019 09:57
My utils functions used in init.vim
" Remove trailing white space, see
function utils#StripTrailingWhitespaces() abort
let l:save = winsaveview()
" vint: next-line -ProhibitCommandRelyOnUser -ProhibitCommandWithUnintendedSideEffect
keeppatterns %s/\v\s+$//e
call winrestview(l:save)
" Create command alias safely, see
" The following two functions are taken from answer below on SO:
jdhao / cpp.vim
Last active September 12, 2019 09:56
Filetype plugins for Neovim
nnoremap <F9> :w <CR> :!g++ -Wall -std=c++11 % -o %<&&./%<<CR>