Implement markdownlint-disable-next-line inline comment (fixes #295).

README.md

@@ -155,13 +155,22 @@ appropriate place (HTML comments don't appear in the final markup):
 
 * Disable all rules: `<!-- markdownlint-disable -->`
 * Enable all rules: `<!-- markdownlint-enable -->`
+* Disable all rules for the next line only: `<!-- markdownlint-disable-next-line -->`
 * Disable one or more rules by name: `<!-- markdownlint-disable MD001 MD005 -->`
 * Enable one or more rules by name: `<!-- markdownlint-enable MD001 MD005 -->`
+* Disable one or more rules by name for the next line only: `<!-- markdownlint-disable-next-line MD001 MD005 -->`
 * Capture the current rule configuration: `<!-- markdownlint-capture -->`
 * Restore the captured rule configuration: `<!-- markdownlint-restore -->`
 
 For example:
 
+```markdown
+<!-- markdownlint-disable-next-line no-space-in-emphasis -->
+deliberate space * in * emphasis
+```
+
+Or:
+
 ```markdown
 <!-- markdownlint-disable no-space-in-emphasis -->
 deliberate space * in * emphasis

helpers/helpers.js

@@ -17,7 +17,7 @@ module.exports.frontMatterRe =
 // Regular expression for matching inline disable/enable comments
 const inlineCommentRe =
   // eslint-disable-next-line max-len
-  /<!--\s*markdownlint-(?:(?:(disable|enable|capture|restore|disable-file|enable-file)((?:\s+[a-z0-9_-]+)*))|(?:(configure-file)\s+([\s\S]*?)))\s*-->/ig;
+  /<!--\s*markdownlint-(?:(?:(disable|enable|capture|restore|disable-file|enable-file|disable-next-line)((?:\s+[a-z0-9_-]+)*))|(?:(configure-file)\s+([\s\S]*?)))\s*-->/ig;
 module.exports.inlineCommentRe = inlineCommentRe;
 
 // Regular expressions for range matching

lib/markdownlint.js

@@ -322,13 +322,13 @@ function getEnabledRulesPerLineNumber(
   // eslint-disable-next-line jsdoc/require-jsdoc
   function handleInlineConfig(perLine, forEachMatch, forEachLine) {
     const input = perLine ? lines : [ lines.join("\n") ];
-    input.forEach((line) => {
+    input.forEach((line, lineIndex) => {
       if (!noInlineConfig) {
         let match = null;
         while ((match = helpers.inlineCommentRe.exec(line))) {
           const action = (match[1] || match[3]).toUpperCase();
           const parameter = match[2] || match[4];
-          forEachMatch(action, parameter);
+          forEachMatch(action, parameter, lineIndex + 1);
         }
       }
       if (forEachLine) {
@@ -351,21 +351,21 @@ function getEnabledRulesPerLineNumber(
     }
   }
   // eslint-disable-next-line jsdoc/require-jsdoc
-  function applyEnableDisable(action, parameter) {
+  function applyEnableDisable(action, parameter, state) {
     const enabled = (action.startsWith("ENABLE"));
     const items = parameter ?
       parameter.trim().toUpperCase().split(/\s+/) :
       allRuleNames;
     items.forEach((nameUpper) => {
       (aliasToRuleNames[nameUpper] || []).forEach((ruleName) => {
-        enabledRules[ruleName] = enabled;
+        state[ruleName] = enabled;
       });
     });
   }
   // eslint-disable-next-line jsdoc/require-jsdoc
   function enableDisableFile(action, parameter) {
     if ((action === "ENABLE-FILE") || (action === "DISABLE-FILE")) {
-      applyEnableDisable(action, parameter);
+      applyEnableDisable(action, parameter, enabledRules);
     }
   }
   // eslint-disable-next-line jsdoc/require-jsdoc
@@ -376,12 +376,22 @@ function getEnabledRulesPerLineNumber(
       enabledRules = { ...capturedRules };
     } else if ((action === "ENABLE") || (action === "DISABLE")) {
       enabledRules = { ...enabledRules };
-      applyEnableDisable(action, parameter);
+      applyEnableDisable(action, parameter, enabledRules);
     }
   }
   // eslint-disable-next-line jsdoc/require-jsdoc
   function updateLineState() {
-    enabledRulesPerLineNumber.push(enabledRules);
+    enabledRulesPerLineNumber.push({ ...enabledRules });
+  }
+  // eslint-disable-next-line jsdoc/require-jsdoc
+  function disableNextLine(action, parameter, lineNumber) {
+    if (action === "DISABLE-NEXT-LINE") {
+      applyEnableDisable(
+        action,
+        parameter,
+        enabledRulesPerLineNumber[lineNumber + 1] || {}
+      );
+    }
   }
   // Handle inline comments
   handleInlineConfig(false, configureFile);
@@ -395,6 +405,7 @@ function getEnabledRulesPerLineNumber(
   capturedRules = enabledRules;
   handleInlineConfig(true, enableDisableFile);
   handleInlineConfig(true, captureRestoreEnableDisable, updateLineState);
+  handleInlineConfig(true, disableNextLine);
   // Return results
   return {
     effectiveConfig,

test/inline-disable-enable.md

@@ -67,3 +67,26 @@ hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code
 hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code {MD038}
 
 embedded <b>{MD033}</b> HTML
+
+<!-- markdownlint-disable line-length -->
+
+hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code {MD038}
+<!-- markdownlint-disable-next-line -->
+hard	tab / space *in * emphasis / space `in ` code
+hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code {MD038}
+hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code {MD038}<!-- markdownlint-disable-next-line -->
+hard	tab / space *in * emphasis / space `in ` code
+hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code {MD038}
+<!-- markdownlint-disable-next-line MD010 MD038 -->
+hard	tab / space *in * emphasis {MD037} / space `in ` code
+hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code {MD038}
+<!-- markdownlint-disable-next-line MD010 --><!-- markdownlint-disable-next-line MD038 -->
+hard	tab / space *in * emphasis {MD037} / space `in ` code
+hard	tab {MD010} / space *in * emphasis {MD037} / space `in ` code {MD038}
+<!--  markdownlint-disable MD010-->
+hard	tab / space *in * emphasis {MD037} / space `in ` code {MD038}
+<!-- markdownlint-disable-next-line MD038 -->
+hard	tab / space *in * emphasis {MD037} / space `in ` code
+hard	tab / space *in * emphasis {MD037} / space `in ` code {MD038}
+
+<!-- markdownlint-disable-next-line -->