Analysis: Work out which templates a state change affects

[marcoroth]

This pull request adds the query the dependency data exists for: given a template and one piece of state, which templates have to be rendered again.

show.html.erb:

<%= render "posts/header", post: @post %>

_header.html.erb:

<%= render "posts/title", title: post.title %>

_title.html.erb:

<h1><%= title %></h1>

affectedTemplates(graph, "app/views/posts/show.html.erb", "@post")
// ["app/views/posts/_header.html.erb", "app/views/posts/_title.html.erb", "app/views/posts/show.html.erb"]

State enters at the entry point and goes no further than the locals carrying it. A partial is affected only when a render call hands it something derived from state its caller is already carrying, so it walks a chain:

Changing @post affects all three. @post flows into post, post flows into title, and each partial starts carrying the local it was handed.

[github-actions]

🌿 Interactive Playground and Documentation Preview

A preview deployment has been built for this pull request. Try out the changes live in the interactive playground:

• Playground Preview
• Documentation Preview
• Website Preview

---

_{🌱 Grown from commit ee32342}

---

✅ Preview deployment has been cleaned up.

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@2188

npx https://pkg.pr.new/@herb-tools/language-server@2188

npx https://pkg.pr.new/@herb-tools/linter@2188

commit: ee32342