build enviroonment: branch diff & patch creation script

git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@3980 e016b1c5-ed68-44aa-a2f7-31cac88cffde

source/vcpp/buildEnv/get-patch.ps1

@@ -0,0 +1,23 @@
+function get-patch
+{
+    param($from, $to);
+    # get diff summary as XML
+    [xml] $summary = (svn diff $to $from -x --ignore-eol-style --xml --summarize);
+    # loop through all diff/paths/path nodes
+    # each node represents a modified/new file
+    foreach($item in $summary.diff.paths.path)
+    {
+        # the SVN url
+        $url=$_."#text";
+        # the relative filename
+        $file=($_."#text".Substring($to.Length));
+        # the parent directory
+        $dir=($file | split-path -parent);
+        # create parent directory if it doesn't exist already
+        if((test-path $dir) -eq $false) { mkdir $dir -force};
+        # export current files from the SVN repository
+        svn export $url $file
+    }
+    # package the current dir (.) into patch.zip
+    sevenzip.exe a patch.zip .
+}