feat: add go generator style options generation

Author: taciturnaxolotl

.github/workflows/update-crush-settings.yml

@@ -0,0 +1,57 @@
+name: Update Crush Settings
+
+on:
+  schedule:
+    # Run daily at 3:00 UTC
+    - cron: "0 3 * * *"
+  workflow_dispatch: # Allow manual triggering
+
+jobs:
+  update-schema:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v5
+
+      - name: Install nix
+        uses: cachix/install-nix-action@v31
+        with:
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.21"
+
+      - name: Generate options from schema
+        run: |
+          cd scripts && go generate
+
+      - name: Format with alejandra
+        run: |
+          nix-shell -p alejandra --run "alejandra modules/crush/options/settings.nix"
+
+      - name: Check for changes
+        id: check_changes
+        run: |
+          if git diff --quiet modules/crush/options.nix; then
+            echo "changed=false" >> $GITHUB_OUTPUT
+          else
+            echo "changed=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Open pull request
+        if: steps.check_changes.outputs.changed == 'true'
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: "chore: update crush schema options"
+          title: "Update Crush schema options"
+          body: |
+            This PR updates the Crush module options from the latest schema.
+
+            Generated automatically by the daily schema update workflow.
+          branch: "update-crush-schema"
+          base: "master"
+          delete-branch: true

scripts/README.md

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+# Scripts
+
+## Crush module options generator
+
+Generates Nix module options from the Crush JSON schema.
+
+### Usage
+
+```bash
+cd scripts && go generate
+```
+
+The generator automatically fetches the version from `pkgs/crush/default.nix` and downloads the corresponding schema from GitHub.
+
+You can also run it manually:
+
+```bash
+go run scripts/generate-crush-settings.go -output modules/crush/options/settings.nix
+```
+
+### Automatic updates
+
+A GitHub Actions workflow runs daily at 3:00 UTC to check for schema updates and automatically opens a PR if changes are detected.

scripts/doc.go

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+// Package main generates Nix module options from Crush schema.
+//
+//go:generate sh -c "cd .. && go run scripts/generate-crush-settings.go -output modules/crush/options/settings.nix"
+package main