In theory it's easy for any reader who wants to parse
trailers to do so. But there are a lot of subtle corner
cases around what counts as a trailer, when the trailer
block begins and ends, etc. Since interpret-trailers already
has our parsing logic, let's let callers ask it to just
output the trailers.
They still have to parse the "key: value" lines, but at
least they can ignore all of the other corner cases.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
Documentation/git-interpret-trailers.txt | 3 +++
builtin/interpret-trailers.c | 1 +
t/t7513-interpret-trailers.sh | 37 ++++++++++++++++++++++++++++++++
trailer.c | 19 ++++++++++------
trailer.h | 1 +
5 files changed, 54 insertions(+), 7 deletions(-)
diff --git a/Documentation/git-interpret-trailers.txt b/Documentation/git-interpret-trailers.txt
index 31cdeaecdf..295dffbd21 100644
--- a/Documentation/git-interpret-trailers.txt
+++ b/Documentation/git-interpret-trailers.txt
@@ -80,6 +80,9 @@ OPTIONS
trailer to the input messages. See the description of this
command.
+--only-trailers::
+ Output only the trailers, not any other parts of the input.
+
CONFIGURATION VARIABLES
-----------------------
diff --git a/builtin/interpret-trailers.c b/builtin/interpret-trailers.c
index bb0d7b937a..afb12c11bc 100644
--- a/builtin/interpret-trailers.c
+++ b/builtin/interpret-trailers.c
@@ -24,6 +24,7 @@ int cmd_interpret_trailers(int argc, const char **argv, const char *prefix)
struct option options[] = {
OPT_BOOL(0, "in-place", &opts.in_place, N_("edit files in place")),
OPT_BOOL(0, "trim-empty", &opts.trim_empty, N_("trim empty trailers")),
+ OPT_BOOL(0, "only-trailers", &opts.only_trailers, N_("output only the trailers")),
OPT_STRING_LIST(0, "trailer", &trailers, N_("trailer"),
N_("trailer(s) to add")),
OPT_END()
diff --git a/t/t7513-interpret-trailers.sh b/t/t7513-interpret-trailers.sh
index 0c6f91c433..e5b0718ef6 100755
--- a/t/t7513-interpret-trailers.sh
+++ b/t/t7513-interpret-trailers.sh
@@ -1275,4 +1275,41 @@ test_expect_success 'with cut line' '
test_cmp expected actual
'
+test_expect_success 'only trailers' '
+ cat >expected <<-\EOF &&
+ existing: existing-value
+ sign: A U Thor <author@xxxxxxxxxxx>
+ added: added-value
+ EOF
+ git interpret-trailers \
+ --trailer added:added-value \
+ --only-trailers >actual <<-\EOF &&
+ my subject
+
+ my body
+
+ existing: existing-value
+ EOF
+ test_cmp expected actual
+'
+
+test_expect_success 'only-trailers omits non-trailer in middle of block' '
+ cat >expected <<-\EOF &&
+ Signed-off-by: nobody <nobody@nowhere>
+ Signed-off-by: somebody <somebody@somewhere>
+ sign: A U Thor <author@xxxxxxxxxxx>
+ EOF
+ git interpret-trailers --only-trailers >actual <<-\EOF &&
+ subject
+
+ it is important that the trailers below are signed-off-by
+ so that they meet the "25% trailers Git knows about" heuristic
+
+ Signed-off-by: nobody <nobody@nowhere>
+ this is not a trailer
+ Signed-off-by: somebody <somebody@somewhere>
+ EOF
+ test_cmp expected actual
+'
+
test_done
diff --git a/trailer.c b/trailer.c
index 0a0c2c264d..a4ff99f98a 100644
--- a/trailer.c
+++ b/trailer.c
@@ -164,13 +164,15 @@ static void print_tok_val(FILE *outfile, const char *tok, const char *val)
fprintf(outfile, "%s%c %s\n", tok, separators[0], val);
}
-static void print_all(FILE *outfile, struct list_head *head, int trim_empty)
+static void print_all(FILE *outfile, struct list_head *head,
+ struct process_trailer_options *opts)
{
struct list_head *pos;
struct trailer_item *item;
list_for_each(pos, head) {
item = list_entry(pos, struct trailer_item, list);
- if (!trim_empty || strlen(item->value) > 0)
+ if ((!opts->trim_empty || strlen(item->value) > 0) &&
+ (!opts->only_trailers || item->token))
print_tok_val(outfile, item->token, item->value);
}
}
@@ -897,9 +899,10 @@ static int process_input_file(FILE *outfile,
trailer_info_get(&info, str);
/* Print lines before the trailers as is */
- fwrite(str, 1, info.trailer_start - str, outfile);
+ if (outfile)
+ fwrite(str, 1, info.trailer_start - str, outfile);
- if (!info.blank_line_before_trailer)
+ if (outfile && !info.blank_line_before_trailer)
fprintf(outfile, "\n");
for (i = 0; i < info.trailer_nr; i++) {
@@ -985,18 +988,20 @@ void process_trailers(const char *file, struct process_trailer_options *opts,
outfile = create_in_place_tempfile(file);
/* Print the lines before the trailers */
- trailer_end = process_input_file(outfile, sb.buf, &head);
+ trailer_end = process_input_file(opts->only_trailers ? NULL : outfile,
+ sb.buf, &head);
process_command_line_args(&arg_head, trailers);
process_trailers_lists(&head, &arg_head);
- print_all(outfile, &head, opts->trim_empty);
+ print_all(outfile, &head, opts);
free_all(&head);
/* Print the lines after the trailers as is */
- fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
+ if (!opts->only_trailers)
+ fwrite(sb.buf + trailer_end, 1, sb.len - trailer_end, outfile);
if (opts->in_place)
if (rename_tempfile(&trailers_tempfile, file))
diff --git a/trailer.h b/trailer.h
index b33c5aa57d..4270849d80 100644
--- a/trailer.h
+++ b/trailer.h
@@ -25,6 +25,7 @@ struct trailer_info {
struct process_trailer_options {
int in_place;
int trim_empty;
+ int only_trailers;
};
#define PROCESS_TRAILER_OPTIONS_INIT {0}
--
2.14.0.609.gd2d1f7ddf
