Replace Spotless with simple python lint script

.github/workflows/build.yml

@@ -19,8 +19,6 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Fetch LintRatchet
-        run: git fetch origin LintRatchet:LintRatchet
       - name: Setup Java
         uses: actions/setup-java@v3
         with:

.github/workflows/build_lint.yml

@@ -12,8 +12,12 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Fetch LintRatchet
-        run: git fetch origin LintRatchet:LintRatchet
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+      - name: Run Linter
+        run: python format_whitespace.py
       - name: Setup Java
         uses: actions/setup-java@v3
         with:
@@ -29,16 +33,14 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('*.gradle', 'gradle.properties', '**/*.accesswidener') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
-      - name: Run Spotless
-        run: ./gradlew spotlessApply
       - name: Run Gradle
         run: ./gradlew && ./gradlew jar
       - name: Upload build
         uses: actions/upload-artifact@v3
         with:
           name: Grasscutter
           path: grasscutter-*.jar
-      - name: Commit any Spotless changes
+      - name: Commit any Linter changes
         uses: EndBug/add-and-commit@v9
         with:
           add: '-u'

build.gradle

@@ -34,9 +34,6 @@ plugins {
     // Maven
     id 'maven-publish'
     id 'signing'
-
-    // Spotless formatter
-    id "com.diffplug.spotless" version "6.8.0"
 }
 
 compileJava.options.encoding = "UTF-8"
@@ -241,30 +238,6 @@ eclipse {
     }
 }
 
-spotless {
-  // optional: limit format enforcement to just the files changed by this feature branch
-  ratchetFrom 'LintRatchet'
-
-  format 'misc', {
-    // define the files to apply `misc` to
-    target '*.gradle', '*.md', '.gitignore'
-
-    // define the steps to apply to those files
-    trimTrailingWhitespace()
-    indentWithSpaces() // or spaces. Takes an integer argument if you don't like 4
-    endWithNewline()
-  }
-  java {
-    // don't need to set target, it is inferred from java
-    // define the steps to apply to those files
-    trimTrailingWhitespace()
-    indentWithSpaces() // or spaces. Takes an integer argument if you don't like 4
-    endWithNewline()
-    replaceRegex('Force one space between if/etc. and ( or {', '(?<=\\b(?:if|for|while|switch|try|else|catch|finally|synchronized)) *(?=[\\(\\{])', ' ')
-    replaceRegex('Force one space between ) and {', '\\) *\\{(?!\\})', ') {')
-  }
-}
-
 signing {
     if(!version.endsWith('-dev')) {
         sign publishing.publications.mavenJava

format_whitespace.py

@@ -0,0 +1,70 @@
+import re
+import subprocess
+
+
+UPSTREAM = 'https://github.com/Grasscutters/Grasscutter.git'
+RATCHET = 'LintRatchet'
+RATCHET_FALLBACK = '8e3deb9'
+
+
+re_leading_whitespace = re.compile(r'^[ \t]+', re.MULTILINE)  # Replace with \1.replace('\t', '    ')
+re_trailing_whitespace = re.compile(r'[ \t]+$', re.MULTILINE)  # Replace with ''
+# Replace 'for (foo){bar' with 'for (foo) {bar'
+re_bracket_space = re.compile(r'\) *\{(?!\})')  # Replace with ') {'
+# Replace 'for(foo)' with 'foo (bar)'
+re_keyword_space = re.compile(r'(?<=\b)(if|for|while|switch|try|else|catch|finally|synchronized) *(?=[\(\{])')  # Replace with '\1 '
+
+
+def get_changed_filelist():
+    subprocess.run(['git', 'fetch', UPSTREAM, f'{RATCHET}:{RATCHET}'])  # Ensure LintRatchet ref is matched to upstream
+    result = subprocess.run(['git', 'diff', RATCHET, '--name-only'], capture_output=True, text=True)
+    if result.returncode != 0:
+        print(f'{RATCHET} not found, trying fallback {RATCHET_FALLBACK}')
+        result = subprocess.run(['git', 'diff', RATCHET_FALLBACK, '--name-only'], capture_output=True, text=True)
+        if result.returncode != 0:
+            print('Fallback is also missing, aborting.')
+            exit(1)
+    return result.stdout.strip().split('\n')
+
+
+def format_string(data: str):
+    data = re_leading_whitespace.sub(lambda m: m.group(0).replace('\t', '    '), data)
+    data = re_trailing_whitespace.sub('', data)
+    data = re_bracket_space.sub(') {', data)
+    data = re_keyword_space.sub(r'\1 ', data)
+    if not data.endswith('\n'):  # Enforce trailing \n
+        data = data + '\n'
+    return data
+
+
+def format_file(filename: str) -> bool:
+    try:
+        with open(filename, 'r') as file:
+            data = file.read()
+        data = format_string(data)
+        with open(filename, 'w') as file:
+            file.write(data)
+        return True
+    except FileNotFoundError:
+        print(f'File not found, probably deleted: {filename}')
+        return False
+
+
+def main():
+    filelist = [f for f in get_changed_filelist() if f.endswith('.java')]
+    replaced = 0
+    not_found = 0
+    if not filelist:
+        print('No changed files due for formatting!')
+        return
+    print('Changed files due for formatting: ', filelist)
+    for file in filelist:
+        if format_file(file):
+            replaced += 1
+        else:
+            not_found += 1
+    print(f'Format complete! {replaced} formatted, {not_found} missing.')
+
+
+if __name__ == '__main__':
+    main()