Make git log --follow find copies among unmodified files.

'git log --follow <path>' don't track copies from unmodified
files, and this patch fix it.

Signed-off-by: Bo Yang <struggleyb.nku@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-log.txt b/Documentation/git-log.txt
index fb184ba1863845797a5f296581ec74a1b31bef1a..0727818bb114faba4c5152d91e40ec0affe99ce9 100644 (file)
--- a/Documentation/git-log.txt
+++ b/Documentation/git-log.txt
@@ -56,7 +56,7 @@ include::diff-options.txt[]
        commits, and doesn't limit diff for those commits.
 
 --follow::
-       Continue listing the history of a file beyond renames.
+       Continue listing the history of a file beyond renames/copies.
 
 --log-size::
        Before the log message print out its size in bytes. Intended

diff --git a/t/t4205-log-follow-harder-copies.sh b/t/t4205-log-follow-harder-copies.sh
new file mode 100755 (executable)
index 0000000..ad29e65
--- /dev/null
+++ b/t/t4205-log-follow-harder-copies.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+#
+# Copyright (c) 2010 Bo Yang
+#
+
+test_description='Test --follow should always find copies hard in git log.
+
+'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/diff-lib.sh
+
+echo >path0 'Line 1
+Line 2
+Line 3
+'
+
+test_expect_success \
+    'add a file path0 and commit.' \
+    'git add path0 &&
+     git commit -m "Add path0"'
+
+echo >path0 'New line 1
+New line 2
+New line 3
+'
+test_expect_success \
+    'Change path0.' \
+    'git add path0 &&
+     git commit -m "Change path0"'
+
+cat <path0 >path1
+test_expect_success \
+    'copy path0 to path1.' \
+    'git add path1 &&
+     git commit -m "Copy path1 from path0"'
+
+test_expect_success \
+    'find the copy path0 -> path1 harder' \
+    'git log --follow --name-status --pretty="format:%s"  path1 > current'
+
+cat >expected <<\EOF
+Copy path1 from path0
+C100   path0   path1
+
+Change path0
+M      path0
+
+Add path0
+A      path0
+EOF
+
+test_expect_success \
+    'validate the output.' \
+    'compare_diff_patch current expected'
+
+test_done

diff --git a/tree-diff.c b/tree-diff.c
index fe9f52c4796512f40869e511b55a2d97fa84532e..1fb3e94614de4973a242b1f039ee7711a74fad9d 100644 (file)
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -346,7 +346,7 @@ static void try_to_follow_renames(struct tree_desc *t1, struct tree_desc *t2, co
 
        diff_setup(&diff_opts);
        DIFF_OPT_SET(&diff_opts, RECURSIVE);
-       diff_opts.detect_rename = DIFF_DETECT_RENAME;
+       DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
        diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
        diff_opts.single_follow = opt->paths[0];
        diff_opts.break_opt = opt->break_opt;