Similar to 'git reset -N', this option makes 'git apply' automatically
mark new files as intent-to-add so they are visible in the following
'git diff' command and could also be committed with 'git commit -a'.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 Documentation/git-apply.txt | 10 +++++++++-
 apply.c                     | 19 ++++++++++++-------
 apply.h                     |  1 +
 t/t2203-add-intent.sh       | 13 +++++++++++++
 4 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/Documentation/git-apply.txt b/Documentation/git-apply.txt
index 4ebc3d3271..e3b966c656 100644
--- a/Documentation/git-apply.txt
+++ b/Documentation/git-apply.txt
@@ -9,7 +9,7 @@ git-apply - Apply a patch to files and/or to the index
 SYNOPSIS
 --------
 [verse]
-'git apply' [--stat] [--numstat] [--summary] [--check] [--index] [--3way]
+'git apply' [--stat] [--numstat] [--summary] [--check] [--index | 
--intent-to-add] [--3way]
          [--apply] [--no-add] [--build-fake-ancestor=<file>] [-R | --reverse]
          [--allow-binary-replacement | --binary] [--reject] [-z]
          [-p<n>] [-C<n>] [--inaccurate-eof] [--recount] [--cached]
@@ -74,6 +74,14 @@ OPTIONS
        cached data, apply the patch, and store the result in the index
        without using the working tree. This implies `--index`.
 
+--intent-to-add::
+       When applying the patch only to the working tree, mark new
+       files to be added to the index later (see `--intent-to-add`
+       option in linkgit:git-add[1]). This option is ignored unless
+       running in a Git repository and `--index` is not specified.
+       Note that `--index` could be implied by other options such
+       as `--cached` or `--3way`.
+
 -3::
 --3way::
        When the patch does not apply cleanly, fall back on 3-way merge if
diff --git a/apply.c b/apply.c
index 7e5792c996..899c5cc0ac 100644
--- a/apply.c
+++ b/apply.c
@@ -141,6 +141,8 @@ int check_apply_state(struct apply_state *state, int 
force_apply)
                        return error(_("--cached outside a repository"));
                state->check_index = 1;
        }
+       if (state->ita_only && (state->check_index || is_not_gitdir))
+               state->ita_only = 0;
        if (state->check_index)
                state->unsafe_paths = 0;
 
@@ -4242,7 +4244,7 @@ static void patch_stats(struct apply_state *state, struct 
patch *patch)
 
 static int remove_file(struct apply_state *state, struct patch *patch, int 
rmdir_empty)
 {
-       if (state->update_index) {
+       if (state->update_index && !state->ita_only) {
                if (remove_file_from_cache(patch->old_name) < 0)
                        return error(_("unable to remove %s from index"), 
patch->old_name);
        }
@@ -4265,15 +4267,15 @@ static int add_index_file(struct apply_state *state,
        int namelen = strlen(path);
        unsigned ce_size = cache_entry_size(namelen);
 
-       if (!state->update_index)
-               return 0;
-
        ce = xcalloc(1, ce_size);
        memcpy(ce->name, path, namelen);
        ce->ce_mode = create_ce_mode(mode);
        ce->ce_flags = create_ce_flags(0);
        ce->ce_namelen = namelen;
-       if (S_ISGITLINK(mode)) {
+       if (state->ita_only) {
+               ce->ce_flags |= CE_INTENT_TO_ADD;
+               set_object_name_for_intent_to_add_entry(ce);
+       } else if (S_ISGITLINK(mode)) {
                const char *s;
 
                if (!skip_prefix(buf, "Subproject commit ", &s) ||
@@ -4465,8 +4467,9 @@ static int create_file(struct apply_state *state, struct 
patch *patch)
 
        if (patch->conflicted_threeway)
                return add_conflicted_stages_file(state, patch);
-       else
+       else if (state->update_index)
                return add_index_file(state, path, mode, buf, size);
+       return 0;
 }
 
 /* phase zero is to remove, phase one is to create */
@@ -4686,7 +4689,7 @@ static int apply_patch(struct apply_state *state,
        if (state->whitespace_error && (state->ws_error_action == 
die_on_ws_error))
                state->apply = 0;
 
-       state->update_index = state->check_index && state->apply;
+       state->update_index = (state->check_index || state->ita_only) && 
state->apply;
        if (state->update_index && !is_lock_file_locked(&state->lock_file)) {
                if (state->index_file)
                        hold_lock_file_for_update(&state->lock_file,
@@ -4941,6 +4944,8 @@ int apply_parse_options(int argc, const char **argv,
                        N_("instead of applying the patch, see if the patch is 
applicable")),
                OPT_BOOL(0, "index", &state->check_index,
                        N_("make sure the patch is applicable to the current 
index")),
+               OPT_BOOL('N', "intent-to-add", &state->ita_only,
+                       N_("mark new files with `git add --intent-to-add`")),
                OPT_BOOL(0, "cached", &state->cached,
                        N_("apply a patch without touching the working tree")),
                OPT_BOOL_F(0, "unsafe-paths", &state->unsafe_paths,
diff --git a/apply.h b/apply.h
index dc4a019057..b80d8ba736 100644
--- a/apply.h
+++ b/apply.h
@@ -45,6 +45,7 @@ struct apply_state {
        int check; /* preimage must match working tree, don't actually apply */
        int check_index; /* preimage must match the indexed version */
        int update_index; /* check_index && apply */
+       int ita_only;     /* add intent-to-add entries to the index */
 
        /* These control cosmetic aspect of the output */
        int diffstat; /* just show a diffstat, and don't actually apply */
diff --git a/t/t2203-add-intent.sh b/t/t2203-add-intent.sh
index 546fead6ad..0891827863 100755
--- a/t/t2203-add-intent.sh
+++ b/t/t2203-add-intent.sh
@@ -245,6 +245,7 @@ test_expect_success 'diff-files/diff-cached shows ita as 
new/not-new files' '
        test_cmp expected2 actual2
 '
 
+
 test_expect_success '"diff HEAD" includes ita as new files' '
        git reset --hard &&
        echo new >new-ita &&
@@ -262,4 +263,16 @@ test_expect_success '"diff HEAD" includes ita as new 
files' '
        test_cmp expected actual
 '
 
+test_expect_success 'apply --intent-to-add' '
+       git reset --hard &&
+       echo new >new-ita &&
+       git add -N new-ita &&
+       git diff >expected &&
+       grep "new file" expected &&
+       git reset --hard &&
+       git apply --intent-to-add expected &&
+       git diff >actual &&
+       test_cmp expected actual
+'
+
 test_done
-- 
2.17.0.705.g3525833791

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