init

diff --git a/bin/dashtopatch b/bin/dashtopatch
new file mode 100755 (executable)
index 0000000..fb3d4fd
--- /dev/null
+++ b/bin/dashtopatch
@@ -0,0 +1,34 @@
+#! /bin/sh
+set -ex
+if [ "$1" = "-f" ];then
+  force=true
+  shift
+elif [ -n "$(/bin/ls *.patch 2>/dev/null|tee /proc/self/fd/2)" ];then
+  echo >&2 "Some *.patch files exist!"
+  exit 1
+else
+  force=false
+fi
+if [ $# != 1 ] || ! echo "$1" | grep -q '-';then
+  echo >&2 "Syntax: $0 branch-list-delimited-by-dashes"
+  exit 1
+fi
+base="master"
+for elem in $(echo "$1"|tr '-' ' ');do
+  if [ "$base" = "master" ];then
+    next="$elem"
+  else
+    next="$base-$elem"
+  fi
+  git checkout "$next"
+  git merge "$base"
+  if $force;then
+    echo -e '/^--- /,$d\nw'|ed "$next".patch
+  else
+    rm -f "$next".patch
+  fi
+  git diff "$base" "$next"|diffdecvs >>"$next".patch
+  base="$next"
+done
+git checkout master
+echo OK