ci: refactor CI files

Mostly rename file and variable names to be more consistent. This makes
it easier to locate them in the "Actions" tab on github.

.github/scripts/reviewers_add.js

@@ -0,0 +1,118 @@
+module.exports = async ({ github, context }) => {
+  const pr_data = await github.rest.pulls.get({
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    pull_number: context.issue.number,
+  });
+  const labels = pr_data.data.labels.map((e) => e.name);
+  const reviewers = new Set();
+
+  if (labels.includes("api")) {
+    reviewers.add("bfredl");
+    reviewers.add("famiu");
+  }
+
+  if (labels.includes("build")) {
+    reviewers.add("dundargoc");
+    reviewers.add("jamessan");
+    reviewers.add("justinmk");
+  }
+
+  if (labels.includes("ci")) {
+    reviewers.add("dundargoc");
+    reviewers.add("jamessan");
+    reviewers.add("justinmk");
+  }
+
+  if (labels.includes("column")) {
+    reviewers.add("lewis6991");
+  }
+
+  if (labels.includes("dependencies")) {
+    reviewers.add("jamessan");
+  }
+
+  if (labels.includes("diagnostic")) {
+    reviewers.add("gpanders");
+  }
+
+  if (labels.includes("diff")) {
+    reviewers.add("lewis6991");
+  }
+
+  if (labels.includes("distribution")) {
+    reviewers.add("jamessan");
+  }
+
+  if (labels.includes("documentation")) {
+    reviewers.add("clason");
+  }
+
+  if (labels.includes("extmarks")) {
+    reviewers.add("bfredl");
+  }
+
+  if (labels.includes("filetype")) {
+    reviewers.add("clason");
+    reviewers.add("gpanders");
+    reviewers.add("smjonas");
+  }
+
+  if (labels.includes("lsp")) {
+    reviewers.add("folke");
+    reviewers.add("MariaSolOs");
+    reviewers.add("mfussenegger");
+  }
+
+  if (labels.includes("options")) {
+    reviewers.add("famiu");
+  }
+
+  if (labels.includes("platform:nix")) {
+    reviewers.add("teto");
+  }
+
+  if (labels.includes("project-management")) {
+    reviewers.add("bfredl");
+    reviewers.add("justinmk");
+  }
+
+  if (labels.includes("statusline")) {
+    reviewers.add("famiu");
+  }
+
+  if (labels.includes("test")) {
+    reviewers.add("justinmk");
+  }
+
+  if (labels.includes("treesitter")) {
+    reviewers.add("bfredl");
+    reviewers.add("clason");
+    reviewers.add("lewis6991");
+  }
+
+  if (labels.includes("typo")) {
+    reviewers.add("dundargoc");
+  }
+
+  if (labels.includes("ui")) {
+    reviewers.add("bfredl");
+    reviewers.add("famiu");
+  }
+
+  if (labels.includes("vim-patch")) {
+    reviewers.add("seandewar");
+    reviewers.add("zeertzjq");
+  }
+
+  // Remove person that opened the PR since they can't review themselves
+  const pr_opener = pr_data.data.user.login;
+  reviewers.delete(pr_opener);
+
+  github.rest.pulls.requestReviewers({
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    pull_number: context.issue.number,
+    reviewers: Array.from(reviewers),
+  });
+};