cmdutil: add origbackuppath helper

mercurial/cmdutil.py

@@ -3114,6 +3114,26 def revert(ui, repo, ctx, parents, *pats
     finally:
         wlock.release()
 
+def origpath(ui, repo, filepath):
+    '''customize where .orig files are created
+
+    Fetch user defined path from config file: [ui] origbackuppath = <path>
+    Fall back to default (filepath) if not specified
+    '''
+    origbackuppath = ui.config('ui', 'origbackuppath', None)
+    if origbackuppath is None:
+        return filepath + ".orig"
+
+    filepathfromroot = os.path.relpath(filepath, start=repo.root)
+    fullorigpath = repo.wjoin(origbackuppath, filepathfromroot)
+
+    origbackupdir = repo.vfs.dirname(fullorigpath)
+    if not repo.vfs.exists(origbackupdir):
+        ui.note(_('creating directory: %s\n') % origbackupdir)
+        util.makedirs(origbackupdir)
+
+    return fullorigpath + ".orig"
+
 def _revertprefetch(repo, ctx, *files):
     """Let extension changing the storage layer prefetch content"""
     pass

mercurial/help/config.txt

@@ -1496,6 +1496,10 User interface controls.
     markers is different from the encoding of the merged files,
     serious problems may occur.
 
+``origbackuppath``
+    The path to a directory used to store generated .orig files. If the path is
+    not a directory, one will be created.
+
 ``patch``
     An optional external tool that ``hg import`` and some extensions
     will use for applying patches. By default Mercurial uses an