This variable should prevent anything to be printed on both stderr
and stdout.

Let's not take care of stdout and apply_verbosely for now though,
as that will be taken care of in following patches.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 apply.c | 43 +++++++++++++++++++++++++++++--------------
 apply.h |  1 +
 2 files changed, 30 insertions(+), 14 deletions(-)

diff --git a/apply.c b/apply.c
index 713d1c0..dbb2515 100644
--- a/apply.c
+++ b/apply.c
@@ -1612,8 +1612,9 @@ static void record_ws_error(struct apply_state *state,
                return;
 
        err = whitespace_error_string(result);
-       fprintf(stderr, "%s:%d: %s.\n%.*s\n",
-               state->patch_input_file, linenr, err, len, line);
+       if (!state->be_silent)
+               fprintf(stderr, "%s:%d: %s.\n%.*s\n",
+                       state->patch_input_file, linenr, err, len, line);
        free(err);
 }
 
@@ -1808,7 +1809,7 @@ static int parse_single_patch(struct apply_state *state,
                return error(_("new file %s depends on old contents"), 
patch->new_name);
        if (0 < patch->is_delete && newlines)
                return error(_("deleted file %s still has contents"), 
patch->old_name);
-       if (!patch->is_delete && !newlines && context)
+       if (!patch->is_delete && !newlines && context && !state->be_silent)
                fprintf_ln(stderr,
                           _("** warning: "
                             "file %s becomes empty but is not deleted"),
@@ -3031,8 +3032,8 @@ static int apply_one_fragment(struct apply_state *state,
                 * Warn if it was necessary to reduce the number
                 * of context lines.
                 */
-               if ((leading != frag->leading) ||
-                   (trailing != frag->trailing))
+               if ((leading != frag->leading ||
+                    trailing != frag->trailing) && !state->be_silent)
                        fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
                                             " to apply fragment at %d"),
                                   leading, trailing, applied_pos+1);
@@ -3529,7 +3530,8 @@ static int try_threeway(struct apply_state *state,
                 read_blob_object(&buf, pre_sha1, patch->old_mode))
                return error("repository lacks the necessary blob to fall back 
on 3-way merge.");
 
-       fprintf(stderr, "Falling back to three-way merge...\n");
+       if (!state->be_silent)
+               fprintf(stderr, "Falling back to three-way merge...\n");
 
        img = strbuf_detach(&buf, &len);
        prepare_image(&tmp_image, img, len, 1);
@@ -3559,7 +3561,9 @@ static int try_threeway(struct apply_state *state,
        status = three_way_merge(image, patch->new_name,
                                 pre_sha1, our_sha1, post_sha1);
        if (status < 0) {
-               fprintf(stderr, "Failed to fall back on three-way merge...\n");
+               if (!state->be_silent)
+                       fprintf(stderr,
+                               "Failed to fall back on three-way merge...\n");
                return status;
        }
 
@@ -3571,9 +3575,15 @@ static int try_threeway(struct apply_state *state,
                        hashcpy(patch->threeway_stage[0].hash, pre_sha1);
                hashcpy(patch->threeway_stage[1].hash, our_sha1);
                hashcpy(patch->threeway_stage[2].hash, post_sha1);
-               fprintf(stderr, "Applied patch to '%s' with conflicts.\n", 
patch->new_name);
+               if (!state->be_silent)
+                       fprintf(stderr,
+                               "Applied patch to '%s' with conflicts.\n",
+                               patch->new_name);
        } else {
-               fprintf(stderr, "Applied patch to '%s' cleanly.\n", 
patch->new_name);
+               if (!state->be_silent)
+                       fprintf(stderr,
+                               "Applied patch to '%s' cleanly.\n",
+                               patch->new_name);
        }
        return 0;
 }
@@ -4472,7 +4482,8 @@ static int write_out_one_reject(struct apply_state 
*state, struct patch *patch)
                            "Applying patch %%s with %d rejects...",
                            cnt),
                    cnt);
-       say_patch_name(stderr, sb.buf, patch);
+       if (!state->be_silent)
+               say_patch_name(stderr, sb.buf, patch);
        strbuf_release(&sb);
 
        cnt = strlen(patch->new_name);
@@ -4499,10 +4510,12 @@ static int write_out_one_reject(struct apply_state 
*state, struct patch *patch)
             frag;
             cnt++, frag = frag->next) {
                if (!frag->rejected) {
-                       fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
+                       if (!state->be_silent)
+                               fprintf_ln(stderr, _("Hunk #%d applied 
cleanly."), cnt);
                        continue;
                }
-               fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
+               if (!state->be_silent)
+                       fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
                fprintf(rej, "%.*s", frag->size, frag->patch);
                if (frag->patch[frag->size-1] != '\n')
                        fputc('\n', rej);
@@ -4551,8 +4564,10 @@ static int write_out_results(struct apply_state *state, 
struct patch *list)
                struct string_list_item *item;
 
                string_list_sort(&cpath);
-               for_each_string_list_item(item, &cpath)
-                       fprintf(stderr, "U %s\n", item->string);
+               if (!state->be_silent) {
+                       for_each_string_list_item(item, &cpath)
+                               fprintf(stderr, "U %s\n", item->string);
+               }
                string_list_clear(&cpath, 0);
 
                rerere(0);
diff --git a/apply.h b/apply.h
index 89e7982..034541a 100644
--- a/apply.h
+++ b/apply.h
@@ -52,6 +52,7 @@ struct apply_state {
        int apply_in_reverse;
        int apply_with_reject;
        int apply_verbosely;
+       int be_silent;
        int no_add;
        int threeway;
        int unidiff_zero;
-- 
2.9.0.rc2.362.g3cd93d0

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