The problem: -w causes the flag DIFF_FROM_CONTENTS to be set, which causes
diff_flush to set the flag HAS_CHANGES based on options->found_changes, which is
set by diff_flush_patch (if there were any changes). However, --quiet causes
diff_flush to never call diff_flush_patch, so options->found_changes is always 0.
The solution: In this situation, call diff_flush_patch with options->file set to
/dev/null.
Rationale: diff_flush_patch expects to write its output to options->file.
Adding a "silence" flag to diff_flush_patch and everything it calls would be
more invasive.
Signed-off-by: Larry D'Anna <larry@xxxxxxxxxxxxxx>
---
diff.c | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/diff.c b/diff.c
index 68def6c..ff00816 100644
--- a/diff.c
+++ b/diff.c
@@ -3522,6 +3522,26 @@ void diff_flush(struct diff_options *options)
separator++;
}
+ if (output_format & DIFF_FORMAT_NO_OUTPUT &&
+ DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
+ DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
+ /* run diff_flush_patch for the exit status */
+ /* setting options->file to /dev/null should be safe, becaue we
+ aren't supposed to produce any output anyways */
+ static FILE *devnull = NULL;
+ if(!devnull) {
+ devnull = fopen("/dev/null", "w");
+ if (!devnull)
+ die_errno("Could not open /dev/null");
+ }
+ options->file = devnull;
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ if (check_pair_status(p))
+ diff_flush_patch(p, options);
+ }
+ }
+
if (output_format & DIFF_FORMAT_PATCH) {
if (separator) {
putc(options->line_termination, options->file);
--
1.7.0.rc2.40.g7d8aa
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