git diffs: Support file copies and renames

* src/patch.c (main): Support git diffs which copy or rename files.
* tests/copy-rename: New test case.
* tests/Makefile.am (TESTS): Add test case.

ChangeLog

@@ -1,5 +1,9 @@
 2009-04-29  Andreas Gruenbacher  <agruen@suse.de>
 
+	* src/patch.c (main): Support git diffs which copy or rename files.
+	* tests/copy-rename: New test case.
+	* tests/Makefile.am (TESTS): Add test case.
+
 	* src/patch.c (main): Convert outname into a char const *.
 	* src/util.ch (create_backup, move_file, removedirs): Take char const *
 	filenames.

src/patch.c

@@ -194,7 +194,13 @@ main (int argc, char **argv)
 
       if (! skip_rest_of_patch)
 	{
-	  outname = outfile ? outfile : inname;
+	  if (outfile)
+	    outname = outfile;
+	  else if (pch_copy () || pch_rename ())
+	    outname = pch_name (! strcmp (inname, pch_name (OLD)));
+	  else
+	    outname = inname;
+
 	  if (! get_input_file (inname, outname, file_type))
 	    {
 	      skip_rest_of_patch = true;
@@ -411,7 +417,8 @@ main (int argc, char **argv)
 		  bool set_mode = new_mode && old_mode != new_mode;
 
 		  /* Avoid replacing files when nothing has changed.  */
-		  if (failed < hunk || diff_type == ED_DIFF || set_mode)
+		  if (failed < hunk || diff_type == ED_DIFF || set_mode
+		      || pch_copy () || pch_rename ())
 		    {
 		      enum file_attributes attr = FA_IDS | FA_MODE;
 		      struct timespec new_time = pch_timestamp (! reverse);
@@ -443,6 +450,14 @@ main (int argc, char **argv)
 
 		      if (! inerrno)
 			set_file_attributes (outname, attr, &instat, mode, &new_time);
+
+		      if (pch_rename ())
+		        {
+			  if (backup)
+			    create_backup (inname, 0, 0, false);
+			  else if (unlink (inname))
+			    pfatal ("Can't remove file %s", quotearg (inname));
+			}
 		    }
 		  else if (backup)
 		    create_backup (outname, 0, 0, true);

tests/Makefile.am

@@ -19,6 +19,7 @@
 TESTS = \
 	asymmetric-hunks \
 	backup-prefix-suffix \
+	copy-rename \
 	corrupt-reject-files \
 	create-delete \
 	crlf-handling \

tests/copy-rename

@@ -0,0 +1,135 @@
+# Copyright (C) 2010 Free Software Foundation, Inc.
+#
+# Copying and distribution of this file, with or without modification,
+# in any medium, are permitted without royalty provided the copyright
+# notice and this notice are preserved.
+
+# git diffs: copy and rename tests
+
+. $srcdir/test-lib.sh
+
+require_cat
+require_diff
+use_local_patch
+use_tmpdir
+
+# ==============================================================
+# Normal copy and rename patches
+
+echo old > f
+
+cat > copy.diff <<EOF
+diff --git a/f b/g
+copy from f
+copy to g
+--- a/f
++++ b/g
+@@ -1 +1 @@
+-old
++new
+EOF
+
+# FIXME: the message is confusing ...
+check 'patch -p1 < copy.diff || echo "Status: $?"' <<EOF
+patching file f
+EOF
+
+check 'cat f' <<EOF
+old
+EOF
+
+check 'cat g' <<EOF
+new
+EOF
+
+cat > rename.diff <<EOF
+diff --git a/f b/h
+rename from f
+rename to h
+--- a/f
++++ b/h
+@@ -1 +1 @@
+-old
++new
+EOF
+
+# FIXME: the message is confusing ...
+check 'patch -p1 < rename.diff || echo "Status: $?"' <<EOF
+patching file f
+EOF
+
+ncheck 'test ! -e f'
+
+check 'cat h' <<EOF
+new
+EOF
+
+# --------------------------------------------------------------
+# Patches with no hunks
+
+echo old > f
+rm -f g h
+
+cat > copy.diff <<EOF
+diff --git a/f a/g
+copy from f
+copy to g
+EOF
+
+# FIXME: the message is confusing ...
+check 'patch -p1 < copy.diff || echo "Status: $?"' <<EOF
+patching file f
+EOF
+
+check 'cat f' <<EOF
+old
+EOF
+
+check 'cat g' <<EOF
+old
+EOF
+
+cat > rename.diff <<EOF
+diff --git a/f a/h
+rename from f
+rename to h
+EOF
+
+# FIXME: the message is confusing ...
+check 'patch -p1 < rename.diff || echo "Status: $?"' <<EOF
+patching file f
+EOF
+
+ncheck 'test ! -e f'
+
+check 'cat h' <<EOF
+old
+EOF
+
+# --------------------------------------------------------------
+# Backup file tests
+
+echo old > f
+rm -f g h
+
+# FIXME: the message is confusing ...
+check 'patch -p1 --backup < copy.diff || echo "Status: $?"' <<EOF
+patching file f
+EOF
+
+ncheck 'test ! -e f.orig'
+
+ncheck 'cat g.orig'
+
+rm -f f.orig g.orig
+
+# FIXME: the message is confusing ...
+check 'patch -p1 --backup < rename.diff || echo "Status: $?"' <<EOF
+patching file f
+EOF
+
+check 'cat f.orig' <<EOF
+old
+EOF
+
+ncheck 'cat h.orig'