Add config file path option to package.json

package.json

@@ -280,6 +280,10 @@
         "SQL-Formatter-VSCode.paramTypes": {
           "type": "object",
           "markdownDescription": "Specifies parameter placeholders types to support."
+        },
+        "SQL-Formatter-VSCode.configFilePath": {
+          "type": "string",
+          "markdownDescription": "Specifies the path to the configuration file to configure sql-formatter; takes precedence over other settings."
         }
       }
     }

src/config.ts

@@ -10,6 +10,7 @@ import {
   FormatOptionsWithLanguage,
   FormatOptions,
 } from 'sql-formatter';
+import { validateConfig } from 'sql-formatter/dist/cjs/validateConfig';
 
 type ParamTypes = FormatOptions['paramTypes'];
 
@@ -53,3 +54,19 @@ const createIndentationConfig = (
     };
   }
 };
+
+export const getConfigFromPath = async (
+  configFilePath: string,
+): Promise<FormatOptionsWithLanguage | undefined> => {
+  try {
+    const fileContent = await vscode.workspace.fs.readFile(vscode.Uri.file(configFilePath));
+    const configString = Buffer.from(fileContent).toString('utf8');
+    const parsed = JSON.parse(configString);
+    return validateConfig(parsed);
+  } catch (error) {
+    vscode.window.showErrorMessage(
+      `Unable to read config file from path ${configFilePath}:\n${error}`,
+    );
+    return undefined;
+  }
+};

src/formatSelection.ts

@@ -1,16 +1,17 @@
 import * as vscode from 'vscode';
-import { createConfig } from './config';
+import { createConfig, getConfigFromPath } from './config';
 import { sqlDialects } from './sqlDialects';
 import { formatEditorText } from './formatEditorText';
 
-export function formatSelection() {
+export async function formatSelection() {
   const editor = vscode.window.activeTextEditor;
   if (!editor) {
     return;
   }
 
   try {
-    replaceEachSelection(editor, text => formatEditorText(text, createConfigForEditor(editor)));
+    const config = await createConfigForEditor(editor);
+    replaceEachSelection(editor, text => formatEditorText(text, config));
   } catch (e) {
     vscode.window.showErrorMessage('Unable to format SQL:\n' + e);
   }
@@ -22,12 +23,16 @@ function replaceEachSelection(editor: vscode.TextEditor, fn: (code: string) => s
   });
 }
 
-const createConfigForEditor = (editor: vscode.TextEditor) =>
-  createConfig(
-    vscode.workspace.getConfiguration('SQL-Formatter-VSCode'),
-    editorFormattingOptions(editor),
-    detectSqlDialect(editor),
+const createConfigForEditor = async (editor: vscode.TextEditor) => {
+  const extensionConfiguration = vscode.workspace.getConfiguration('SQL-Formatter-VSCode');
+  const configFilePath = extensionConfiguration.get<string>('configFilePath');
+  const configFromPath = configFilePath ? await getConfigFromPath(configFilePath) : undefined;
+  const formattingOptions = editorFormattingOptions(editor);
+  const detectedSqlDialect = detectSqlDialect(editor);
+  return (
+    configFromPath ?? createConfig(extensionConfiguration, formattingOptions, detectedSqlDialect)
   );
+};
 
 const detectSqlDialect = (editor: vscode.TextEditor) =>
   sqlDialects[editor.document.languageId] ?? 'sql';