patchport: Add automated patch porting

.gitignore

@@ -1 +1,2 @@
 patches/*/*-custom.patch
+patches/*/*.patch-failed

README.md

@@ -20,7 +20,7 @@ Feel free to ignore play protect, it's bullshit.
 
 #### Toolchain setup
 
-- Get apktool (due to [a bug](https://github.com/iBotPeaches/Apktool/issues/1909) present on apktool v2.3.4, I recommend using [this build](https://elixi.re/i/cq4r2zxg.jar))
+- Get apktool (due to 2 bugs present in v2.3.4, you're strongly recommended to use v2.4.0)
 - Get a keystore, see [here](https://stackoverflow.com/a/14994354/3286892), step 1.
 - If you want Mutant Standard emoji patches, get 72x72 copies of latest version of mutant standard emojis with codepoints. I have a zip [here](https://mutant.lavatech.top/72x72.zip).
 - Extract the emojis you got somewhere.
@@ -46,7 +46,7 @@ To get the diff, run `diff -crB -x "dist" -x "res/raw" -x "build" CleanFolder Pa
 
 #### Porting patches
 
-You can use `patchport` to easily attempt to port patches.
+You can use `patchport.py` to easily attempt to port patches.
 
 It's not really intelligent and doesn't do much more than just checking if an existing patch can be applied to a given version (it also replaces relevant variables required for porting various patches), but it saves a lot of time if used carefully.
 

patchport.py

@@ -4,6 +4,7 @@ import sys
 import os
 import subprocess
 import datetime
+import shutil
 
 # Example invocation:
 # python3 patchport.py 839 8.3.9g
@@ -14,6 +15,7 @@ from_versionname = sys.argv[2]
 apk_folder = sys.argv[3]
 cutthecord_folder = sys.argv[4]
 debug = False
+tmp_folder = "/tmp/patchport"
 
 
 def modify_patch(patch_name, patch_path):
@@ -32,6 +34,20 @@ def modify_patch(patch_name, patch_path):
     return patch_content
 
 
+def fix_offset(patch_contents):
+    # OH GOD OH FUCK
+    shutil.rmtree(tmp_folder, ignore_errors=True)
+    shutil.copytree(apk_folder, tmp_folder)
+    subprocess.run("patch -p1 --no-backup-if-mismatch --force",
+                   shell=True, input=patch_contents, text=True,
+                   cwd=tmp_folder)
+    out = subprocess.run(f"diff -crB {apk_folder} {tmp_folder}",
+                         shell=True, input=patch_contents, text=True,
+                         cwd=tmp_folder, capture_output=True)
+    shutil.rmtree(tmp_folder, ignore_errors=True)
+    return out.stdout
+
+
 re_versioncode = re.compile(r'platformBuildVersionCode="([0-9]+)"')
 re_versionname = re.compile(r'platformBuildVersionName="([0-9a-z.]+)"')
 re_releasedate = re.compile(r'released on ([0-9]{4}-[0-9]{2}-[0-9]{2})')
@@ -64,7 +80,8 @@ for patch in os.listdir(os.path.join(cutthecord_folder, "patches")):
     # Check if patch exists for from_version, if it doesn't, warn user
     if not os.path.isfile(patch_path):
         # Don't warn on instructional patches
-        if patch not in ["customfont", "customring", "bettertm", "bettertmlight"]:
+        if patch not in ["customfont", "customring",
+                         "bettertm", "bettertmlight"]:
             print(f"SKIPPED: No {from_versionname} version found for {patch}.")
         continue
 
@@ -80,10 +97,10 @@ for patch in os.listdir(os.path.join(cutthecord_folder, "patches")):
     if "FAILED" in out.stdout:
         print(f"FAILED: {patch} failed, please fix by hand.")
         failures.append(patch)
-        continue
+        out_path += "-failed"
-    # TODO: Can we do this automatically?
     elif "offset" in out.stdout:
-        print(f"WARNING: {patch} has offsets, please correct by hand.")
+        patch_contents = fix_offset(patch_contents)
+        print(f"WARNING: {patch} has offsets which were auto corrected.")
 
     if debug:
         print(out.stdout)