This makes the commands respect diff configuration options, such as
indentHeuristic, because init_revisions() calls diff_setup() which fills
in the diff_options struct.

Signed-off-by: Marc Branchaud <marcn...@xiplink.com>
---
 builtin/diff-files.c   |  2 +-
 builtin/diff-index.c   |  2 +-
 builtin/diff-tree.c    |  2 +-
 t/t4061-diff-indent.sh | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 69 insertions(+), 3 deletions(-)

diff --git a/builtin/diff-files.c b/builtin/diff-files.c
index 15c61fd8d..a572da9d5 100644
--- a/builtin/diff-files.c
+++ b/builtin/diff-files.c
@@ -20,9 +20,9 @@ int cmd_diff_files(int argc, const char **argv, const char 
*prefix)
        int result;
        unsigned options = 0;
 
+       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        init_revisions(&rev, prefix);
        gitmodules_config();
-       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        rev.abbrev = 0;
        precompose_argv(argc, argv);
 
diff --git a/builtin/diff-index.c b/builtin/diff-index.c
index 1af373d00..f084826a2 100644
--- a/builtin/diff-index.c
+++ b/builtin/diff-index.c
@@ -17,9 +17,9 @@ int cmd_diff_index(int argc, const char **argv, const char 
*prefix)
        int i;
        int result;
 
+       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        init_revisions(&rev, prefix);
        gitmodules_config();
-       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        rev.abbrev = 0;
        precompose_argv(argc, argv);
 
diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index 326f88b65..36a3a1976 100644
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -105,9 +105,9 @@ int cmd_diff_tree(int argc, const char **argv, const char 
*prefix)
        struct setup_revision_opt s_r_opt;
        int read_stdin = 0;
 
+       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        init_revisions(opt, prefix);
        gitmodules_config();
-       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        opt->abbrev = 0;
        opt->diff = 1;
        opt->disable_stdin = 1;
diff --git a/t/t4061-diff-indent.sh b/t/t4061-diff-indent.sh
index 556450609..13d3dc96a 100755
--- a/t/t4061-diff-indent.sh
+++ b/t/t4061-diff-indent.sh
@@ -213,4 +213,70 @@ test_expect_success 'blame: --no-indent-heuristic 
overrides config' '
        compare_blame spaces-expect out-blame2
 '
 
+test_expect_success 'diff-tree: nice spaces with --indent-heuristic' '
+       git diff-tree --indent-heuristic -p old new -- spaces.txt 
>out-diff-tree-compacted &&
+       compare_diff spaces-compacted-expect out-diff-tree-compacted
+'
+
+test_expect_success 'diff-tree: nice spaces with diff.indentHeuristic' '
+       git -c diff.indentHeuristic=true diff-tree -p old new -- spaces.txt 
>out-diff-tree-compacted2 &&
+       compare_diff spaces-compacted-expect out-diff-tree-compacted2
+'
+
+test_expect_success 'diff-tree: --no-indent-heuristic overrides config' '
+       git -c diff.indentHeuristic=true diff-tree --no-indent-heuristic -p old 
new -- spaces.txt >out-diff-tree &&
+       compare_diff spaces-expect out-diff-tree
+'
+
+test_expect_success 'diff-index: nice spaces with --indent-heuristic' '
+       git checkout -B diff-index &&
+       git reset --soft HEAD~ &&
+       git diff-index --indent-heuristic -p old -- spaces.txt 
>out-diff-index-compacted &&
+       compare_diff spaces-compacted-expect out-diff-index-compacted &&
+       git checkout -f master
+'
+
+test_expect_success 'diff-index: nice spaces with diff.indentHeuristic' '
+       git checkout -B diff-index &&
+       git reset --soft HEAD~ &&
+       git -c diff.indentHeuristic=true diff-index -p old -- spaces.txt 
>out-diff-index-compacted2 &&
+       compare_diff spaces-compacted-expect out-diff-index-compacted2 &&
+       git checkout -f master
+'
+
+test_expect_success 'diff-index: --no-indent-heuristic overrides config' '
+       git checkout -B diff-index &&
+       git reset --soft HEAD~ &&
+       git -c diff.indentHeuristic=true diff-index --no-indent-heuristic -p 
old -- spaces.txt >out-diff-index &&
+       compare_diff spaces-expect out-diff-index &&
+       git checkout -f master
+'
+
+test_expect_success 'diff-files: nice spaces with diff.indentHeuristic' '
+       git checkout -B diff-files &&
+       git reset HEAD~ &&
+       git -c diff.indentHeuristic=true diff-files -p spaces.txt 
>out-diff-files-raw &&
+       grep -v index out-diff-files-raw >out-diff-files-compacted &&
+       compare_diff spaces-compacted-expect out-diff-files-compacted &&
+       git checkout -f master
+'
+
+test_expect_success 'diff-files: nice spaces with diff.indentHeuristic' '
+       git checkout -B diff-files &&
+       git reset HEAD~ &&
+       git -c diff.indentHeuristic=true diff-files -p spaces.txt 
>out-diff-files-raw2 &&
+       grep -v index out-diff-files-raw2 >out-diff-files-compacted2 &&
+       compare_diff spaces-compacted-expect out-diff-files-compacted2 &&
+       git checkout -f master
+'
+
+test_expect_success 'diff-files: --no-indent-heuristic overrides config' '
+       git checkout -B diff-files &&
+       git reset HEAD~ &&
+       git -c diff.indentHeuristic=true diff-files --no-indent-heuristic -p 
spaces.txt >out-diff-files-raw3 &&
+       grep -v index out-diff-files-raw3 >out-diff-files &&
+       compare_diff spaces-expect out-diff-files &&
+       git checkout -f master
+'
+
 test_done
-- 
2.13.0.rc1.15.gf67d331ad

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