feat: use git repo instead of arbitrary directories and busybox diff

apatch

@@ -1,23 +1,21 @@
 #!/bin/sh
 
-cleanup() {
-  rm -rf src-old
-}
-
-trap 'cleanup' EXIT INT HUP
-
 startdir="$PWD"
 
 [ -f APKBUILD ] || ( echo "please run this in a package directory"; exit 1 )
 [ "$1" != "" ] || ( echo "usage: apatch <patch name>"; exit 1 )
 
-abuild clean fetch unpack prepare || exit 1
+set -e
+
+abuild clean fetch unpack default_prepare
 
 # obtain builddir
+startdir="$PWD"
+srcdir="$startdir/src"
 . APKBUILD
-[ -z "$builddir" ] && builddir="/$pkgname-$pkgver"
+test -n "$builddir" || builddir="$srcdir/$pkgname-$pkgver"
 
-cp -r src src-old
+patchpath="$startdir/$1"
 
 for patch in $source; do
   if [ "$patch" = "$1" ]; then
@@ -25,16 +23,39 @@ for patch in $source; do
     # but we want the original src to not have it, so we can get a full diff of
     # its original changes + our new ones
     (
-      cd "src-old/$builddir"
-      patch -R -p1 < "$startdir/$1"
+      cd "$builddir"
+      patch -R -p1 < "$patchpath"
     )
     break
   fi
 done
 
 (
-  cd "src$builddir"
-  $SHELL
-)
+	cd "$builddir"
+	git init
+	git add .
+	git commit -m "$pkgver" >/dev/null
 
-busybox diff -N -U3 -r "src-old$builddir" "src$builddir" | sed "s|src-old$builddir|a|g;s|src$builddir|b|g" > $1
+  # if file exists, try to apply
+  if [ -e "$patchpath" ]; then
+    git apply --reject --quiet --whitespace=fix "$patchpath" || {
+      git status --porcelain | grep '\?\? .*\.rej$' | cut -c4- | while read -r reject; do
+        target="${reject%.rej}"
+        wiggle --merge --replace "$target" "$reject" || {
+          echo "[!] could not merge $target, fix manually"
+        }
+        rm "$reject"
+        rm "$target.porig" # left by wiggle
+      done
+    }
+  fi
+
+	$SHELL
+
+	git add .
+	git diff --cached > "$patchpath"
+	if [ ! -s "$patchpath" ]; then
+	  echo "[*] patch is empty, removing"
+	  rm "$patchpath"
+	fi
+)