From 0420071d33c54daac7cbf53181c1023538528795 Mon Sep 17 00:00:00 2001
From: Tony Hallett <tonyhallett74@gmail.com>
Date: Sat, 21 Dec 2019 06:02:02 +0000
Subject: [PATCH] feat: respect .prettierignore (#317)

---
 README.md                                       | 14 ++++++++++++++
 src/prettierRule.ts                             | 17 +++++++++++++++++
 tests/prettier/prettier-ignored/.prettierignore |  1 +
 .../prettierIgnoredSyntaxError.ts.lint          |  1 +
 tests/prettier/prettier-ignored/tslint.json     |  6 ++++++
 5 files changed, 39 insertions(+)
 create mode 100644 tests/prettier/prettier-ignored/.prettierignore
 create mode 100644 tests/prettier/prettier-ignored/prettierIgnoredSyntaxError.ts.lint
 create mode 100644 tests/prettier/prettier-ignored/tslint.json

diff --git a/README.md b/README.md
index 16b7fe4b..b48be9e4 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,20 @@ for `tslint@^5.0.0`
   }
   ```
 
+## Ignoring files
+
+- It will respect your .prettierignore file in your project root ( process.cwd() ) but if you would like to use a different file you can provide it in the third argument, for example:
+
+  ```json
+  {
+    "extends": ["tslint-plugin-prettier"],
+    "rules": {
+      "prettier": [true, null, { "ignorePath": "otherDirectory/.prettierignore" }]
+    }
+  }
+
+  ```
+
 ## Development
 
 ```sh
diff --git a/src/prettierRule.ts b/src/prettierRule.ts
index 448f4482..738bd3c6 100644
--- a/src/prettierRule.ts
+++ b/src/prettierRule.ts
@@ -7,10 +7,27 @@ import * as ts from 'typescript';
 
 export class Rule extends tslint.Rules.AbstractRule {
   public apply(sourceFile: ts.SourceFile): tslint.RuleFailure[] {
+    if (this.sourceFileIsIgnored(sourceFile, this.ruleArguments)) {
+      return [];
+    }
     return this.applyWithWalker(
       new Walker(sourceFile, this.ruleName, this.ruleArguments),
     );
   }
+  private getIgnorePath(ruleArguments: any[]) {
+    let ignorePath = '.prettierignore';
+    if (ruleArguments.length === 2 && ruleArguments[1].ignorePath) {
+      ignorePath = ruleArguments[1].ignorePath;
+    }
+    return ignorePath;
+  }
+  private sourceFileIsIgnored(sourceFile: ts.SourceFile, ruleArguments: any[]) {
+    const ignorePath = this.getIgnorePath(ruleArguments);
+    const fileInfo = prettier.getFileInfo.sync(sourceFile!.fileName, {
+      ignorePath,
+    });
+    return fileInfo.ignored;
+  }
 }
 
 class Walker extends tslint.AbstractWalker<any[]> {
diff --git a/tests/prettier/prettier-ignored/.prettierignore b/tests/prettier/prettier-ignored/.prettierignore
new file mode 100644
index 00000000..dae5c386
--- /dev/null
+++ b/tests/prettier/prettier-ignored/.prettierignore
@@ -0,0 +1 @@
+prettierIgnoredSyntaxError.ts
diff --git a/tests/prettier/prettier-ignored/prettierIgnoredSyntaxError.ts.lint b/tests/prettier/prettier-ignored/prettierIgnoredSyntaxError.ts.lint
new file mode 100644
index 00000000..3b18e512
--- /dev/null
+++ b/tests/prettier/prettier-ignored/prettierIgnoredSyntaxError.ts.lint
@@ -0,0 +1 @@
+hello world
diff --git a/tests/prettier/prettier-ignored/tslint.json b/tests/prettier/prettier-ignored/tslint.json
new file mode 100644
index 00000000..6098bd74
--- /dev/null
+++ b/tests/prettier/prettier-ignored/tslint.json
@@ -0,0 +1,6 @@
+{
+  "rulesDirectory": ["../../../rules"],
+  "rules": {
+    "prettier": [true, null, { "ignorePath": "tests/prettier/prettier-ignored/.prettierignore"}]
+  }
+}