fix: Append a new line to the code before sending it to the linter (#4)

* Append a new line to the code before sending it to the linter (fix #1)

* Correct way of extracting source code

Author: sapegin

src/textlint-rule-eslint.js

@@ -26,7 +26,8 @@ const reporter = (context, options) => {
                 return;
             }
             const raw = getSource(node);
-            const code = node.value;
+            const code = getUntrimmedCode(node, raw);
+
             const resultLinting = engine.executeOnText(code, node.lang);
             if (resultLinting.errorCount === 0) {
                 return;
@@ -65,6 +66,34 @@ const reporter = (context, options) => {
         }
     }
 };
+
+/**
+ * get actual code value from CodeBlock node
+ * @param {Object} node
+ * @param {string} raw raw value include CodeBlock syntax
+ * @returns {string}
+ */
+function getUntrimmedCode(node, raw) {
+    if (node.type !== "CodeBlock") {
+        return node.value
+    }
+
+    // Space indented CodeBlock that has not lang
+    if (!node.lang) {
+        return node.value;
+    }
+
+    // https://github.com/wooorm/remark/issues/207#issuecomment-244620590
+    const lines = raw.split("\n");
+    
+    // code lines without the first line and the last line
+    const codeLines = lines.slice(1, lines.length - 1);
+    
+    // add last new line
+    // \n```
+    return codeLines.join("\n") + "\n";
+}
+
 module.exports = {
     linter: reporter,
     fixer: reporter

test/fixtures/style.eslintconfig.js

@@ -2,6 +2,7 @@
 "use strict";
 module.exports = {
     rules: {
+        "eol-last": ["error", "always"],
         "indent": ["error", 4, {
             "SwitchCase": 1
         }],

test/textlint-rule-eslint-test.js

@@ -14,7 +14,23 @@ tester.run("textlint-rule-eslint", rule, {
             options: {
                 configFile: configFilePath
             }
-        }
+        },
+        {
+            text: "```js\n" +
+            "var a = 1;\n" +
+            "```",
+            options: {
+                   configFile: configFilePath
+            }
+        },
+        {
+            text: "```js\n\n" +
+            "var a = 1;\n\n" +
+            "```",
+            options: {
+                   configFile: configFilePath
+            }
+        },
     ],
     invalid: [
         {