Add column support to mypy (#3699)

* #3597: Modified mypy linter plugin to support column numbers for reported errors.
* Add news entry

news/1 Enhancements/3597.md

@@ -0,0 +1,2 @@
+Add support for column numbers for problems returned by `mypy`.  
+(thanks [Eric Traut](https://github.com/erictraut))

package.json

@@ -1326,7 +1326,8 @@
                     "description": "Arguments passed in. Each argument is a separate item in the array.",
                     "default": [
                         "--ignore-missing-imports",
-                        "--follow-imports=silent"
+                        "--follow-imports=silent",
+                        "--show-column-numbers"
                     ],
                     "items": {
                         "type": "string"

src/client/linters/mypy.ts

@@ -5,7 +5,7 @@ import { IServiceContainer } from '../ioc/types';
 import { BaseLinter } from './baseLinter';
 import { ILintMessage } from './types';
 
-export const REGEX = '(?<file>.+):(?<line>\\d+): (?<type>\\w+): (?<message>.*)\\r?(\\n|$)';
+export const REGEX = '(?<file>[^:]+):(?<line>\\d+)(:(?<column>\\d+))?: (?<type>\\w+): (?<message>.*)\\r?(\\n|$)';
 
 export class MyPy extends BaseLinter {
     constructor(outputChannel: OutputChannel, serviceContainer: IServiceContainer) {

src/test/linters/mypy.unit.test.ts

@@ -15,6 +15,7 @@ import { ILintMessage } from '../../client/linters/types';
 const output = `
 provider.pyi:10: error: Incompatible types in assignment (expression has type "str", variable has type "int")
 provider.pyi:11: error: Name 'not_declared_var' is not defined
+provider.pyi:12:21: error: Expression has type "Any"
 `;
 
 suite('Linting - MyPy', () => {
@@ -36,6 +37,14 @@ suite('Linting - MyPy', () => {
                 line: 11,
                 type: 'error',
                 provider: 'mypy'
+             } as ILintMessage],
+            [lines[3], {
+                code: undefined,
+                message: 'Expression has type "Any"',
+                column: 21,
+                line: 12,
+                type: 'error',
+                provider: 'mypy'
              } as ILintMessage]
         ];
         for (const [line, expected] of tests) {