DEV Community: Jie

Setup GPG for git on macOS

Jie — Wed, 14 Apr 2021 07:08:09 +0000

Install gnupg and pinentry-mac

brew install gnupg
brew install pinentry-mac

Generating a GPG key

Github help

Generating key

gpg --full-generate-key

Checking the key

gpg --list-secret-keys --keyid-format LONG
/Users/hubot/.gnupg/secring.gpg
------------------------------------
sec   4096R/3AA5C34371567BD2 2016-03-10 [expires: 2017-03-10]
uid                          Hubot 
ssb   4096R/42B317FD4BA89E7A 2016-03-10

Copying the key

In this example, the GPG key ID is 3AA5C34371567BD2

gpg --armor --export 3AA5C34371567BD2 | pbcopy

Load the key for git

vim .gnupg/gpg-agent.conf

add the line

pinentry-program /usr/local/bin/pinentry-mac

Backup and restore

gpg --export-secret-keys KEY_ID > my-private-key.asc
gpg --import my-private-key.asc

Multiple gitconfig

Jie — Thu, 03 Sep 2020 06:04:01 +0000

I need to do dev of work on my personal laptop. Usually, I will clone the repository and set a work email for that repository by git config user.email <your@email.com>. That requests config for each working repositories, and if there are other settings, it requires more actions. And most important, I forget to set up it sometimes.

Later, I did search on the internet and found I am actually able to set a separated gitconfig for the specific folder. Below are the steps.

Create a separated gitconfig file

~/.gitconfig-work

Add the settings you need into the file, like email/name

git config -f ~/.gitconfig-work user.email <your@email.com>

Now we have gitconfig file for working.

Set work folder to use the new config file

git config --global "includeIf.gitdir:~/work/.path" "~/.gitconfig-work"

Then for all repositories inside of work folder, it will use the new config file.

Bouns

Add isWork to the new config file

git config -f ~/.gitconfig-work core.isWork true

And run below command inside of the work folder to see if the config is applied

git config --get core.isWork || echo false

credit/reference: https://filipe.kiss.ink/multiple-gpg-keys-git/

Panic/recover and goroutine in Golang

Jie — Fri, 12 Jun 2020 06:56:48 +0000

The panic recover is only alive within the current thread, that means each goroutine need it’s own panic recover

The panic in this goroutine, wont be caught by the recover, it will panic.

defer func() {
    if rec := recover(); rec != nil {
        fmt.Println("Catched panic", rec)
    }
}()
fmt.Println("Hello, playground")
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
    defer wg.Done()
    panic("You can't catch me!")
}()
wg.Wait()

To catch the panic inside of the goroutine, you need code the recover again

defer func() {
    if rec := recover(); rec != nil {
        fmt.Println("Catched panic", rec)
    }
}()
fmt.Println("Hello, playground")
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
    defer func() {
        if rec := recover(); rec != nil {
            fmt.Printf("Now catched `%v`\n", rec)
        }
    }()
    defer wg.Done()
    panic("You can't catch me!")
}()
wg.Wait()

nvALT revisit

Jie — Wed, 10 Jun 2020 05:44:15 +0000

I am looking for an app to do random text input on the macOS, and sync through my own and company's laptops. I tried Tot/Drafts, since I removed my iCloud account on the company's laptop, the only modern way is using Dropbox.

Then I get back the nvALT after I found it supports backlink, but inside of the app itself, by using [[text]], you can click it to search the nvALT with text.

Gruvbox Dark Color

Based on Gruvbox color scheme

Font: SF Compact Text

Search Highlight: #FE8019

Foreground Text: #EBDBB2

Background: #282828

Website: jma.dev

Weekly Tech bookmarks: funcmarks

Which browser for what link on macOS

Jie — Fri, 29 May 2020 12:31:48 +0000

It’s hard to split work and personal usage on the laptop at all.

I would like to open work related web pages on Google Chrome, and all others go to Safari

Before I have a Keyboard Maestro Marcos, I manually copy the address to clipboard and use hotkey to open it in the Google Chrome.

However, this needs two more steps that are right-clicking or selection, and the hotkey.

Then I find a few apps that can do the same with just clicking. You need to set the app as the default browser, and once you click the address, the app will help you forward to the specific app by the rule you set up.

I also made a shortcuts on iOS that you can use share sheet or clipboard to open the address in Google Chrome iOS.

Choosy

The only one supports Google Chrome Profile so far. So if you have multiple profiles in Google Chrome, this is the only choice for you right now. Also, it has a similar popup browser selection like Bumpr.

Bumpr

The UI is the best, especially the popup browser selection, however, once you set up the rule, you could not edit it.

Browser Opener

Similar to Choosy, but not support Google Chrome Profile yet

Finicky

Very recently found this open source, you need to write a config file using JavaScript rather than GUI. However, there is a page finicky kickstart that helps you generate a basic config file. Also, There is one feature that you can edit the urls before opening.

Weekly tech bookmarks funcmarks

Using Brewfile to automatic setup macOS from scratch

Jie — Fri, 29 May 2020 04:00:51 +0000

brew bundle

https://github.com/Homebrew/homebrew-bundle

The bundle is automatically installed once it is used.

dump current apps to `Brewfile`

brew bundle dump

Import from `Brewfile`

Run the cmd from the same folder of Brewfile

brew bundle

I put it in my dotfiles. This one is mine

Move Hexo to Hugo

Jie — Fri, 24 Apr 2020 06:49:35 +0000

What is Hugo?

Hugo is a static site generator written in Go. It is optimized for speed, easy use and configurability. Hugo takes a directory with content and templates and renders them into a full html website. Hugo makes use of markdown files with front matter for meta data.

Hexo vs Hugo

Hexo is also fast and simple, it is a static blog generator, and Hugo is more like for a site not only blog. Hexo is written in Node.js. Since I am a Golang developer now. I think it is good to move to Hugo.

Prepare Hugo

Check the Hugo official page Migrate to Hugo before you do it by yourself.

Hugo has different content structure than Hexo.

First of all, remove any unrelated files like themes, submodules, hexo config file...

for removing submodules from https://stackoverflow.com/questions/1260748/how-do-i-remove-a-submodule/36593218#36593218

# Remove the submodule entry from .git/config
git submodule deinit -f path/to/submodule

# Remove the submodule directory from the superproject's .git/modules directory
rm -rf .git/modules/path/to/submodule

# Remove the entry in .gitmodules and remove the submodule directory located at path/to/submodule
git rm -f path/to/submodule

Then, Install Hugo and run hugo new site --force in the current folder, it will generate the mandatory files for the site.

Add theme you like and do configuration.

Move all posts to the new content folder, I put mine into the content/posts. Update the front matter of the posts to avoid compile error in the Hugo.

That’s almost done, it is easy because I moved my site from Jekyll to Hexo, then to Hugo, they all use markdown files and front matter for the post.

Continuous Delivery (CD)

I switched from Github to Firebase hosting after I moved from Jekyll to Hexo. Firebase hosting will give you a free SSL.

TravisCI

I use Travis CI to build pages and deploy to Firebase hosting. You can check mine .travis.yml file.

Firebase hosting

You need a token to deploy to Firebase hosting from ci, following the doc Firebase CLI reference. Then Add the token to Travis CI .

Last

So now, once TravisCI detects your master branch of repository has been changed, it will trigger the build in TravisCI, and build the static site and publish to firebase hosting.

Poker StraightFlush

Jie — Fri, 01 Sep 2017 14:51:22 +0000

First of all, PHP Code Example. (PHP ≥ 7)

function isStriaghtFlush($d) {
    $b = $f = 0;
    $m = ['a'=>1,1=>10,'j'=>11,'q'=>12,'k'=>13];
    foreach ($d as $a) {
        $p = substr($a,-1);
        $b |= 1<<(($m[$a[0]])??$a[0]);
        $f = ($f===0||$f===$p) ? $p : 1;
    }
    $b = ($b << 3) | ($b >> 10);
    foreach (range(0,13) as $i) {
        if ((($b >> $i) & 31) == 31){
            return [true, $f!=1];
        }
    }
    return [false, false];
}

Explain:

A can be straight of A, 2, 3, 4, 5 and 10, J, Q, K A

There are total 14 ranks, when getting rank n from the $d, we set 1 of the n element in bitwise map.

If we could find any 5 continuously 1 in the bitwise map, then it’s straight. also if all faces are same, then it’s straight flush.

Example, cards: 10, J, Q, K, A

read 10, bitwise map: 0,0,0,1,0,0,0,0,0,0,0,0,0,0

read J, bitwise map: 0,0,1,1,0,0,0,0,0,0,0,0,0,0

read Q, bitwise map: 0,1,1,1,0,0,0,0,0,0,0,0,0,0

read K, bitwise map: 1,1,1,1,0,0,0,0,0,0,0,0,0,0

read A, bitwise map: 1,1,1,1,0,0,0,0,0,0,0,0,1,0

shift left 3 of bitwise map to 1,1,1,1,0,0,0,0,0,0,0,0,1,0,0,0,0

shift right 10 of bitwise map to 1,1,1,1

OR this two bitwise maps and get a new map 1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,1

then we have 5 continuously 1, it’s straight.