web/ui: Add make targets for PromQL function generation.

Add make targets to generate and check PromQL function signatures and
documentation for the Mantine UI. The generate-promql-functions target
runs the Go generators and automatically lints the output files. The
check-generated-promql-functions target verifies that generated files
are up to date, similar to check-generated-parser.

Fix the gen_functions_list generator to output properly formatted
TypeScript code with correct indentation and semicolons.

Add check-generated-promql-functions to the UI tests CI job to ensure
generated files stay in sync with upstream changes.

Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com>

.github/workflows/ci.yml

@@ -202,20 +202,20 @@ jobs:
         if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
         run: exit 1
   check_generated_parser:
-    name: Check generated parser
+    name: Check generated parser and functions
     runs-on: ubuntu-latest
+    container:
+      image: quay.io/prometheus/golang-builder:1.25-base
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
-      - name: Install Go
-        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
+      - uses: prometheus/promci@c0916f0a41f13444612a8f0f5e700ea34edd7c19 # v0.5.3
+      - uses: ./.github/promci/actions/setup_environment
         with:
-          cache: false
-          go-version: 1.25.x
-      - name: Run goyacc and check for diff
-        run: make install-goyacc check-generated-parser
+          enable_npm: true
+      - run: make install-goyacc check-generated-parser
+      - run: make check-generated-promql-functions
   golangci:
     name: golangci-lint
     runs-on: ubuntu-latest

Makefile

@@ -79,6 +79,20 @@ ui-lint:
 	# new Mantine-based UI is fully integrated and the old app can be removed.
 	cd $(UI_PATH)/react-app && npm run lint
 
+.PHONY: generate-promql-functions
+generate-promql-functions: ui-install
+	@echo ">> generating PromQL function signatures"
+	@cd $(UI_PATH)/mantine-ui/src/promql/tools && $(GO) run ./gen_functions_list > ../functionSignatures.ts
+	@echo ">> generating PromQL function documentation"
+	@cd $(UI_PATH)/mantine-ui/src/promql/tools && $(GO) run ./gen_functions_docs $(CURDIR)/docs/querying/functions.md > ../functionDocs.tsx
+	@echo ">> formatting generated files"
+	@cd $(UI_PATH)/mantine-ui && npx prettier --write --print-width 120 src/promql/functionSignatures.ts src/promql/functionDocs.tsx
+
+.PHONY: check-generated-promql-functions
+check-generated-promql-functions: generate-promql-functions
+	@echo ">> checking generated PromQL functions"
+	@git diff --exit-code -- $(UI_PATH)/mantine-ui/src/promql/functionSignatures.ts $(UI_PATH)/mantine-ui/src/promql/functionDocs.tsx || (echo "Generated PromQL function files are out of date. Please run 'make generate-promql-functions' and commit the changes." && false)
+
 .PHONY: assets
 ifndef SKIP_UI_BUILD
 assets: check-node-version ui-install ui-build

web/ui/mantine-ui/src/promql/tools/gen_functions_list/main.go

@@ -41,10 +41,10 @@ func main() {
 	sort.Strings(fnNames)
 	fmt.Println(`import { valueType, Func } from './ast';
 
-	export const functionSignatures: Record<string, Func> = {`)
+export const functionSignatures: Record<string, Func> = {`)
 	for _, fnName := range fnNames {
 		fn := parser.Functions[fnName]
 		fmt.Printf("  %s: { name: '%s', argTypes: [%s], variadic: %d, returnType: %s },\n", fn.Name, fn.Name, formatValueTypes(fn.ArgTypes), fn.Variadic, formatValueType(fn.ReturnType))
 	}
-	fmt.Println("}")
+	fmt.Println("};")
 }