feat(frontend): preprocessor snippet completion in code editor (#6502)

* feat(frontend): preprocessor snippet completion in code editor

* fix: only for main script editor

frontend/src/lib/components/Editor.svelte

@@ -155,6 +155,7 @@
 	import { aiChatManager } from './copilot/chat/AIChatManager.svelte'
 	import type { Selection } from 'monaco-editor'
 	import { getDbSchemas } from './apps/components/display/dbtable/utils'
+	import { PYTHON_PREPROCESSOR_MODULE_CODE, TS_PREPROCESSOR_MODULE_CODE } from '$lib/script_helpers'
 	// import EditorTheme from './EditorTheme.svelte'
 
 	let divEl: HTMLDivElement | null = $state(null)
@@ -185,6 +186,7 @@
 		key?: string | undefined
 		class?: string | undefined
 		moduleId?: string
+		enablePreprocessorSnippet?: boolean
 	}
 
 	let {
@@ -211,7 +213,8 @@
 		loadAsync = false,
 		key = undefined,
 		class: clazz = undefined,
-		moduleId = undefined
+		moduleId = undefined,
+		enablePreprocessorSnippet = false
 	}: Props = $props()
 
 	$effect.pre(() => {
@@ -665,6 +668,55 @@
 		}
 	}
 
+	let preprocessorCompletor: IDisposable | undefined = undefined
+	function addPreprocessorCompletions(lang: 'typescript' | 'python') {
+		if (preprocessorCompletor) {
+			preprocessorCompletor.dispose()
+		}
+		const preprocessorCode =
+			lang === 'typescript' ? TS_PREPROCESSOR_MODULE_CODE : PYTHON_PREPROCESSOR_MODULE_CODE
+		preprocessorCompletor = languages.registerCompletionItemProvider(lang, {
+			provideCompletionItems: function (model, position) {
+				const word = model.getWordUntilPosition(position)
+
+				if (word.word.length >= 3 && 'preprocessor'.startsWith(word.word)) {
+					const range = {
+						startLineNumber: position.lineNumber,
+						endLineNumber: position.lineNumber,
+						startColumn: word.startColumn,
+						endColumn: word.endColumn
+					}
+					return {
+						suggestions: [
+							{
+								label: 'preprocessor (windmill)',
+								kind: languages.CompletionItemKind.Function,
+								insertTextRules: languages.CompletionItemInsertTextRule.InsertAsSnippet,
+								insertText: preprocessorCode,
+								range,
+								additionalTextEdits: [
+									{
+										range: {
+											startLineNumber: position.lineNumber,
+											endLineNumber: position.lineNumber,
+											startColumn: 0,
+											endColumn: word.startColumn
+										},
+										text: ''
+									}
+								]
+							}
+						]
+					}
+				}
+
+				return {
+					suggestions: []
+				}
+			}
+		})
+	}
+
 	let reviewingChanges = $state(writable(false))
 	let aiChatEditorHandler: AIChatEditorHandler | undefined = $state(undefined)
 
@@ -1568,6 +1620,7 @@
 		sqlSchemaCompletor && sqlSchemaCompletor.dispose()
 		autocompletor && autocompletor.dispose()
 		sqlTypeCompletor && sqlTypeCompletor.dispose()
+		preprocessorCompletor && preprocessorCompletor.dispose()
 		timeoutModel && clearTimeout(timeoutModel)
 		loadTimeout && clearTimeout(loadTimeout)
 		aiChatEditorHandler?.clear()
@@ -1620,6 +1673,12 @@
 			: sqlTypeCompletor?.dispose()
 	})
 
+	$effect(() => {
+		initialized && (lang === 'typescript' || lang === 'python') && enablePreprocessorSnippet
+			? untrack(() => addPreprocessorCompletions(lang as 'typescript' | 'python'))
+			: preprocessorCompletor?.dispose()
+	})
+
 	let lastArg = undefined
 	$effect(() => {
 		let newArg = lang === 'graphql' ? args?.api : args?.database

frontend/src/lib/components/ScriptBuilder.svelte

@@ -1791,6 +1791,7 @@
 			bind:hasPreprocessor
 			bind:captureTable
 			bind:assets={script.assets}
+			enablePreprocessorSnippet
 		/>
 	</div>
 {:else}

frontend/src/lib/components/ScriptEditor.svelte

@@ -81,6 +81,7 @@
 		disableAi?: boolean
 		assets?: AssetWithAltAccessType[]
 		editor_bar_right?: import('svelte').Snippet
+		enablePreprocessorSnippet?: boolean
 	}
 
 	let {
@@ -111,7 +112,8 @@
 		lastDeployedCode = undefined,
 		disableAi = false,
 		assets = $bindable(),
-		editor_bar_right
+		editor_bar_right,
+		enablePreprocessorSnippet = false
 	}: Props = $props()
 
 	$effect.pre(() => {
@@ -625,6 +627,7 @@
 						automaticLayout={true}
 						{fixedOverflowWidgets}
 						{args}
+						{enablePreprocessorSnippet}
 					/>
 					<DiffEditor
 						className="h-full"