Reimplement MD014/commands-show-output using micromark tokens.

test/code_block_dollar.md

@@ -74,3 +74,7 @@ All commands with no output:
     $ mkdir test {MD014}
     $ cd test {MD014}
     $ ls test {MD014}
+
+Space-prefixed command with no output:
+
+     $ ls example {MD014}

test/code_block_dollar_fence.md

@@ -40,4 +40,8 @@ text
 $ npm install --save multimatch {MD014}
 ```
 
-text
+Space-prefixed command with no output:
+
+```sh
+ $ ls example {MD014}
+```

test/snapshots/markdownlint-test-scenarios.js.md

@@ -10083,6 +10083,25 @@ Generated by [AVA](https://avajs.dev).
             'commands-show-output',
           ],
         },
+        {
+          errorContext: ' $ ls example {MD014}',
+          errorDetail: null,
+          errorRange: [
+            6,
+            2,
+          ],
+          fixInfo: {
+            deleteCount: 2,
+            editColumn: 6,
+          },
+          lineNumber: 80,
+          ruleDescription: 'Dollar signs used before commands without showing output',
+          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md014.md',
+          ruleNames: [
+            'MD014',
+            'commands-show-output',
+          ],
+        },
         {
           errorContext: null,
           errorDetail: 'Expected: indented; Actual: fenced',
@@ -10173,6 +10192,10 @@ Generated by [AVA](https://avajs.dev).
           mkdir test {MD014}␊
           cd test {MD014}␊
           ls test {MD014}␊
+      ␊
+      Space-prefixed command with no output:␊
+      ␊
+           ls example {MD014}␊
       `,
     }
 
@@ -10344,6 +10367,25 @@ Generated by [AVA](https://avajs.dev).
             'commands-show-output',
           ],
         },
+        {
+          errorContext: ' $ ls example {MD014}',
+          errorDetail: null,
+          errorRange: [
+            2,
+            2,
+          ],
+          fixInfo: {
+            deleteCount: 2,
+            editColumn: 2,
+          },
+          lineNumber: 46,
+          ruleDescription: 'Dollar signs used before commands without showing output',
+          ruleInformation: 'https://github.com/DavidAnson/markdownlint/blob/v0.0.0/doc/md014.md',
+          ruleNames: [
+            'MD014',
+            'commands-show-output',
+          ],
+        },
       ],
       fixed: `# Code Block Dollar Fence␊
       ␊
@@ -10387,7 +10429,11 @@ Generated by [AVA](https://avajs.dev).
       npm install --save multimatch {MD014}␊
       \`\`\`␊
       ␊
-      text␊
+      Space-prefixed command with no output:␊
+      ␊
+      \`\`\`sh␊
+       ls example {MD014}␊
+      \`\`\`␊
       `,
     }