feat: add --git-ignore option

When set, excludes git ignored files from patch creation.

README.md

@@ -130,6 +130,11 @@ team.
 - `--patch-dir`
 
   Specify the name for the directory in which to put the patch files.
+
+- `--git-ignore`
+
+  By default, patch-package creates patches disregarding your git-ignore
+  settings. Set this option to exclude git-ignored files from patches.
 
 #### Nested packages
 

integration-tests/exclude-git-ignored-files/exclude-git-ignored-files.sh

@@ -0,0 +1,61 @@
+# make sure errors stop the script
+set -e
+
+echo "add patch-package"
+yarn add $1
+
+echo "intitialize a git repo"
+git init
+
+addedFileName=addedFileName.md
+addedFile=node_modules/lodash/$addedFileName
+addedIgnoredFileName=addedIgnoredFileName.md
+addedIgnoredFile=node_modules/lodash/$addedIgnoredFileName
+removedFileName=fp/__.js
+removedFile=node_modules/lodash/$removedFileName
+removedIgnoredFileName=fp.js
+removedIgnoredFile=node_modules/lodash/$removedIgnoredFileName
+
+echo "add not ignored file"
+echo "this should be patched" > $addedFile
+
+echo "add ignored file"
+echo "this should be ginored" > $addedIgnoredFile
+
+echo "remove a not ignored file"
+rm $removedFile
+
+echo "remove an ignored file"
+rm $removedIgnoredFile
+
+echo "config .gitignore"
+echo $addedIgnoredFileName > .gitignore
+echo $removedIgnoredFileName >> .gitignore
+
+echo "generate patch file"
+npx patch-package lodash --git-ignore
+
+echo "remove node_modules"
+rm -rf node_modules
+
+echo "resintall and patch node_modules"
+yarn
+npx patch-package
+
+echo "check that not ignored file was added"
+ls $addedFile
+
+echo "check that ignored file was not added"
+if ls $addedIgnoredFile
+then
+  exit 1
+fi
+
+echo "check that not ignored file was removed"
+if ls $removedFile
+then
+  exit 1
+fi
+
+echo "check that ignored file was not removed"
+ls $removedIgnoredFile

integration-tests/exclude-git-ignored-files/exclude-git-ignored-files.test.ts

@@ -0,0 +1,6 @@
+import { runIntegrationTest } from "../runIntegrationTest"
+
+runIntegrationTest({
+  projectName: "exclude-git-ignored-files",
+  shouldProduceSnapshots: false,
+})

integration-tests/exclude-git-ignored-files/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "exclude-git-ignored-files",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "lodash": "4.17.4"
+  }
+}