From bbabcf54676edea765053202129eac87c1c39b68 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Krystian=20Bac=C5=82awski?= <krystian.baclawski@gmail.com>
Date: Sun, 19 May 2013 13:42:48 +0200
Subject: [PATCH] Two useful scripts for diff file manipulations.

---
 scripts/merge-rej.sh  | 12 ++++++++++++
 scripts/split-diff.sh | 26 ++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100755 scripts/merge-rej.sh
 create mode 100755 scripts/split-diff.sh

diff --git a/scripts/merge-rej.sh b/scripts/merge-rej.sh
new file mode 100755
index 0000000..1087622
--- /dev/null
+++ b/scripts/merge-rej.sh
@@ -0,0 +1,12 @@
+#!/bin/sh -x
+
+file=${1#*sources/}
+
+pushd "sources" > /dev/null
+wiggle --replace $file $file.rej
+vimdiff $file.orig $file
+echo "sources/${file}.orig vs. sources/${file} -> patches/${file}.diff"
+diff -du $file.orig $file | sed '1s/\.orig//' >$file.diff
+popd > /dev/null
+
+mv -i "sources/$file.diff" "patches/$file.diff"
diff --git a/scripts/split-diff.sh b/scripts/split-diff.sh
new file mode 100755
index 0000000..16872ca
--- /dev/null
+++ b/scripts/split-diff.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# 1) Splits a patch file into smaller patches - one for each file.
+# 2) Build a directory structure correspoding to paths in patch headers.
+# 3) Copies smaller patches into newly created directories.
+# 4) If a patch introduces a completely new file, it will be put into directory
+#    as a regular file and not diff file.
+
+[ $# == 1 ] || echo "Error: expected single patch file as an argument."
+[ -f $1 ] || echo "Error: no such file '$1'."
+
+path="$1"
+
+splitdiff -a "${path}" >/dev/null
+
+for p in ${path}.part???; do
+  file=`sed -E -n -e '1s/---[[:space:]]+([^[:space:]]+).*/\1/p' ${p}`
+  origsize=`sed -E -n -e '3s/@@ ([^[:space:]]+) .*/\1/p' ${p}`
+  mkdir -p `dirname ${file}`
+  if [ "${origsize}" == "-0,0" ]; then
+    sed -E -n -e '3,$s/^\+(.*)/\1/p' ${p} >${file}
+  else
+    cp ${p} ${file}.diff
+  fi
+  rm ${p}
+done