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Packaging apps

Packaging apps is useful for running apps on multiple machines without worrying about versions.

Here is a short guide on packaging Python apps, in 20 steps. It first involves “freezing” it using PyInstaller, then bundling it into an AppImage using AppImageKit’s appimagetool.

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Concat to PDF

I wrote a script a few months ago to scrape web novels. I extracted them as plaintext and saved every chapter. Since some books had over a hundred chapters, I wanted to concatenate them so it would be easier to read. Concatenation can be done quickly using cat and tools like pandoc can generate pretty PDFs.

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Overriding exit to tmux detach

I was using mosh like this:

function mssh {
    echo "> mosh --no-init $1 -- tmux new-session -A -s main"
    mosh --no-init $1 -- tmux new-session -A -s main
}

But sometimes I would enter exit instead of tmux detach and I would lose the session I had on the remote!

So I found this code block that I inserted into my remote ~/.bashrc that would help me. It’s simple to read, if the session is not tmux, we exit, but if it is, check if it is desirable to preserve the session.

# also see https://medium.com/@toja/tip-using-mosh-with-scrollback-257a54a848b3
exit() {
  if [[ -z $TMUX ]]; then
    builtin exit
    return
  fi

  panes=$(tmux list-panes | wc -l)
  wins=$(tmux list-windows | wc -l)
  count=$(($panes + $wins - 1))
  if [ $count -eq 1 ]; then
    tmux detach
  else
    builtin exit
  fi
}

Note, pressing (CTRL+D) will still exit the session, if you want.

tags: code

Resolving changes overwritten

So I got this error the other day when I ran git pull: “Your local changes to the following files would be overwritten by merge:” because my package.json file was outdated.

I always keep git update-index --assume-unchanged for my package.json so it was frustrating that git is trying to overwrite it. (I know I could edit the .gitignore, but there are other developers on this project.)

Anyway, in my heart of hearts, I knew that keeping the new package.json is probably better, so this is what I did:

git update-index --no-assume-unchanged package.json package-lock.json
git checkout -b k-localchanges1
git add -v .
git commit -m "message" # I'm backing up my copy of package.json into my local branch
git checkout development
git pull
rm -rf node_modules/
npm install
npx expo -c

tags: code