Clear line when printing warnings

Author: fvictorio

src/common/print-warning.js

@@ -0,0 +1,12 @@
+export function printWarning(message) {
+  // Prettier prints some temporary messages while formatting, and this warning
+  // can mess with that output. We clear the line and move the cursor to the
+  // beginning of the line to avoid this.
+  //
+  // \x1b: Escape character
+  //  [2K: Escape code to clear the entire line
+  //   \r: Carriage return
+  const clearLine = '\x1b[2K\r';
+
+  console.warn(`${clearLine}[prettier-solidity] ${message}`);
+}

src/parser.js

@@ -3,6 +3,8 @@ import parser from '@solidity-parser/parser';
 import coerce from 'semver/functions/coerce.js';
 import satisfies from 'semver/functions/satisfies.js';
 
+import { printWarning } from './common/print-warning.js';
+
 const tryHug = (node, operators) => {
   if (node.type === 'BinaryOperation' && operators.includes(node.operator))
     return {
@@ -27,8 +29,8 @@ function parse(text, _parsers, options = _parsers) {
       if (!satisfies(compiler, ctx.value)) {
         // @TODO: investigate the best way to warn that would apply to
         // different editors.
-        console.warn(
-          `[prettier-solidity] The compiler option is set to '${options.compiler}', which does not satisfy 'pragma solidity ${ctx.value}'.`
+        printWarning(
+          `The compiler option is set to '${options.compiler}', which does not satisfy 'pragma solidity ${ctx.value}'.`
         );
       }
     },

src/printer.js

@@ -1,4 +1,5 @@
 import * as nodes from './nodes/index.js';
+import { printWarning } from './common/print-warning.js';
 import {
   hasNodeIgnoreComment,
   prettierVersionSatisfies
@@ -16,7 +17,7 @@ function once(factory) {
 }
 
 const warnDeprecation = once(() => {
-  console.warn(
+  printWarning(
     `'solidity-parse' has been deprecated, please use 'slang-solidity'.`
   );
   return true;