Ability to draw on top of an "existing" terminal output

[farzadmf]

Describe the solution you'd like
I think it would be nice to have the ability to draw on an existing output in the terminal.

An example use case:

• You're running some commands and have some output
• You want to "highlight" or draw attention to a particular portion
• You call draw and it takes a "screenshot" of existing output, allowing to draw on top of that

Describe alternatives you've considered
None

[maaslalani]

I think it would be really great if you could pass input to annotate over stdin so that way you can pipe to draw to start annotating output.

ls -lah | draw

One problem I can see though is that some programs will strip unicode characters when piped which means we'd lose color that way :(

[caproven]

Another potential factor is double-width (wide) characters. This may not be a concern for current user input, but wide chars could very well be piped into draw from other commands. Should there be handling for them?

Here's an example of using a wide char with the current version. I wrote out the text and then attempted to draw a single box around it:

I bring this up because various CLIs have begun incorporating emojis in their output. Take for example the output of kind:

❯ kind create cluster
Creating cluster "kind" ...
 ✓ Ensuring node image (kindest/node:v1.21.1) 🖼
 ✓ Preparing nodes 📦
 ✓ Writing configuration 📜
 ✓ Starting control-plane 🕹️
 ✓ Installing CNI 🔌
 ✓ Installing StorageClass 💾
Set kubectl context to "kind-kind"
You can now use your cluster with:

kubectl cluster-info --context kind-kind

Thanks for using kind! 😊

[maaslalani]

Yes, there definitely should be handling for double-width characters:
I think I have an idea on how to implement support but might be tricky.

Thinking out loud: my thinking is that we can reserve a special character to insert after (to the right of) any character that is > 2 character width in the grid and display that character as blank when View() is called. We can then ensure a box border doesn't lie on any of those special characters and if it does, move it to the right/left until it doesn't.