prepare.sh: generate patches from builddir

prepare.sh

@@ -8,9 +8,47 @@ patch_target() {
   fi
 }
 
-if git -C ".." status | head -n1 | grep "v2016.2.x"; then
-  patch_target
-else
-  echo "no gluon repo founden or wrong branch"
-  exit 1
-fi
+patch_gluon() {
+  if git -C ".." status | head -n1 | grep "v2016.2.x"; then
+    patch_target
+  else
+    echo "no gluon repo founden or wrong branch"
+    exit 1
+  fi
+}
+
+update_patches() {
+  if git -C ".." status | head -n1 | grep "v2016.2.x"; then
+    make -C ".." update-patches
+    #rm -f gluon_patches/*.patch
+    local base=$PWD
+    cd ..
+    n=0
+    for patch in $(git ls-files --others --exclude-standard); do
+      let n=n+1
+      local filename="$(diff -Naur /dev/null "$patch" | grep "+Subject: " | tr " " _ )"
+      diff -Naur /dev/null "$patch" > "$base/gluon_patches/$(printf '%04u' $n)-${filename//+Subject:_/}.patch"
+      echo "creating: $(printf '%04u' $n)-${filename//+Subject:_/}.patch"
+    done
+    cd "$base" || exit 1
+  else
+    echo "no gluon repo founden or wrong branch"
+    exit 1
+  fi
+}
+
+case "$1" in
+  "patch")
+    patch_gluon
+  ;;
+  "update-patches")
+    update_patches
+  ;;
+  *)
+    echo "Usage: $0 command"
+    echo "command:"
+    echo "  patch"
+    echo "  update-patches"
+    echo
+  ;;
+esac