More tests and bug fixes for status with rename

This changes the behavior of the status RENAMED flags so that they
will be combined with the MODIFIED flags if appropriate.  If a file
is modified in the index and also renamed, then the status code
will have both the GIT_STATUS_INDEX_MODIFIED and INDEX_RENAMED bits
set.  If it is renamed but the OID has not changed, then just the
GIT_STATUS_INDEX_RENAMED bit will be set.  Similarly, the flags
GIT_STATUS_WT_MODIFIED and GIT_STATUS_WT_RENAMED can both be set
independently of one another.

This fixes a serious bug where the check for unmodified files that
was done at data load time could end up erasing the RENAMED state
of a file that was renamed with no changes.

Lastly, this contains a bunch of new tests for status with renames,
including tests where the only rename changes are case changes.
The expected results of these tests have to vary by whether the
platform uses a case sensitive filesystem or not, so the expected
data covers those platform differences separately.

1 files changed, 59 insertions, 50 deletions

diff --git a/src/diff_print.c b/src/diff_print.c
index 244aa6e1d..6fc7425eb 100644
--- a/src/diff_print.c
+++ b/src/diff_print.c
@@ -41,7 +41,7 @@ static int diff_print_info_init(
 	return 0;
 }
 
-static char pick_suffix(int mode)
+static char diff_pick_suffix(int mode)
 {
 	if (S_ISDIR(mode))
 		return '/';
@@ -76,10 +76,11 @@ static int callback_error(void)
 	return GIT_EUSER;
 }
 
-static int print_compact(
+static int diff_print_one_compact(
 	const git_diff_delta *delta, float progress, void *data)
 {
 	diff_print_info *pi = data;
+	git_buf *out = pi->buf;
 	char old_suffix, new_suffix, code = git_diff_status_char(delta->status);
 
 	GIT_UNUSED(progress);
@@ -87,34 +88,35 @@ static int print_compact(
 	if (code == ' ')
 		return 0;
 
-	old_suffix = pick_suffix(delta->old_file.mode);
-	new_suffix = pick_suffix(delta->new_file.mode);
+	old_suffix = diff_pick_suffix(delta->old_file.mode);
+	new_suffix = diff_pick_suffix(delta->new_file.mode);
 
-	git_buf_clear(pi->buf);
+	git_buf_clear(out);
 
 	if (delta->old_file.path != delta->new_file.path &&
 		pi->diff->strcomp(delta->old_file.path,delta->new_file.path) != 0)
-		git_buf_printf(pi->buf, "%c\t%s%c -> %s%c\n", code,
+		git_buf_printf(out, "%c\t%s%c -> %s%c\n", code,
 			delta->old_file.path, old_suffix, delta->new_file.path, new_suffix);
 	else if (delta->old_file.mode != delta->new_file.mode &&
 		delta->old_file.mode != 0 && delta->new_file.mode != 0)
-		git_buf_printf(pi->buf, "%c\t%s%c (%o -> %o)\n", code,
+		git_buf_printf(out, "%c\t%s%c (%o -> %o)\n", code,
 			delta->old_file.path, new_suffix, delta->old_file.mode, delta->new_file.mode);
 	else if (old_suffix != ' ')
-		git_buf_printf(pi->buf, "%c\t%s%c\n", code, delta->old_file.path, old_suffix);
+		git_buf_printf(out, "%c\t%s%c\n", code, delta->old_file.path, old_suffix);
 	else
-		git_buf_printf(pi->buf, "%c\t%s\n", code, delta->old_file.path);
+		git_buf_printf(out, "%c\t%s\n", code, delta->old_file.path);
 
-	if (git_buf_oom(pi->buf))
+	if (git_buf_oom(out))
 		return -1;
 
 	if (pi->print_cb(delta, NULL, GIT_DIFF_LINE_FILE_HDR,
-			git_buf_cstr(pi->buf), git_buf_len(pi->buf), pi->payload))
+			git_buf_cstr(out), git_buf_len(out), pi->payload))
 		return callback_error();
 
 	return 0;
 }
 
+/* print a git_diff_list to a print callback in compact format */
 int git_diff_print_compact(
 	git_diff_list *diff,
 	git_diff_data_cb print_cb,
@@ -125,17 +127,18 @@ int git_diff_print_compact(
 	diff_print_info pi;
 
 	if (!(error = diff_print_info_init(&pi, &buf, diff, print_cb, payload)))
-		error = git_diff_foreach(diff, print_compact, NULL, NULL, &pi);
+		error = git_diff_foreach(diff, diff_print_one_compact, NULL, NULL, &pi);
 
 	git_buf_free(&buf);
 
 	return error;
 }
 
-static int print_raw(
+static int diff_print_one_raw(
 	const git_diff_delta *delta, float progress, void *data)
 {
 	diff_print_info *pi = data;
+	git_buf *out = pi->buf;
 	char code = git_diff_status_char(delta->status);
 	char start_oid[GIT_OID_HEXSZ+1], end_oid[GIT_OID_HEXSZ+1];
 
@@ -144,36 +147,37 @@ static int print_raw(
 	if (code == ' ')
 		return 0;
 
-	git_buf_clear(pi->buf);
+	git_buf_clear(out);
 
 	git_oid_tostr(start_oid, pi->oid_strlen, &delta->old_file.oid);
 	git_oid_tostr(end_oid, pi->oid_strlen, &delta->new_file.oid);
 
 	git_buf_printf(
-		pi->buf, ":%06o %06o %s... %s... %c",
+		out, ":%06o %06o %s... %s... %c",
 		delta->old_file.mode, delta->new_file.mode, start_oid, end_oid, code);
 
 	if (delta->similarity > 0)
-		git_buf_printf(pi->buf, "%03u", delta->similarity);
+		git_buf_printf(out, "%03u", delta->similarity);
 
 	if (delta->status == GIT_DELTA_RENAMED || delta->status == GIT_DELTA_COPIED)
 		git_buf_printf(
-			pi->buf, "\t%s %s\n", delta->old_file.path, delta->new_file.path);
+			out, "\t%s %s\n", delta->old_file.path, delta->new_file.path);
 	else
 		git_buf_printf(
-			pi->buf, "\t%s\n", delta->old_file.path ?
+			out, "\t%s\n", delta->old_file.path ?
 			delta->old_file.path : delta->new_file.path);
 
-	if (git_buf_oom(pi->buf))
+	if (git_buf_oom(out))
 		return -1;
 
 	if (pi->print_cb(delta, NULL, GIT_DIFF_LINE_FILE_HDR,
-			git_buf_cstr(pi->buf), git_buf_len(pi->buf), pi->payload))
+			git_buf_cstr(out), git_buf_len(out), pi->payload))
 		return callback_error();
 
 	return 0;
 }
 
+/* print a git_diff_list to a print callback in raw output format */
 int git_diff_print_raw(
 	git_diff_list *diff,
 	git_diff_data_cb print_cb,
@@ -184,15 +188,16 @@ int git_diff_print_raw(
 	diff_print_info pi;
 
 	if (!(error = diff_print_info_init(&pi, &buf, diff, print_cb, payload)))
-		error = git_diff_foreach(diff, print_raw, NULL, NULL, &pi);
+		error = git_diff_foreach(diff, diff_print_one_raw, NULL, NULL, &pi);
 
 	git_buf_free(&buf);
 
 	return error;
 }
 
-static int print_oid_range(diff_print_info *pi, const git_diff_delta *delta)
+static int diff_print_oid_range(diff_print_info *pi, const git_diff_delta *delta)
 {
+	git_buf *out = pi->buf;
 	char start_oid[GIT_OID_HEXSZ+1], end_oid[GIT_OID_HEXSZ+1];
 
 	git_oid_tostr(start_oid, pi->oid_strlen, &delta->old_file.oid);
@@ -200,27 +205,27 @@ static int print_oid_range(diff_print_info *pi, const git_diff_delta *delta)
 
 	/* TODO: Match git diff more closely */
 	if (delta->old_file.mode == delta->new_file.mode) {
-		git_buf_printf(pi->buf, "index %s..%s %o\n",
+		git_buf_printf(out, "index %s..%s %o\n",
 			start_oid, end_oid, delta->old_file.mode);
 	} else {
 		if (delta->old_file.mode == 0) {
-			git_buf_printf(pi->buf, "new file mode %o\n", delta->new_file.mode);
+			git_buf_printf(out, "new file mode %o\n", delta->new_file.mode);
 		} else if (delta->new_file.mode == 0) {
-			git_buf_printf(pi->buf, "deleted file mode %o\n", delta->old_file.mode);
+			git_buf_printf(out, "deleted file mode %o\n", delta->old_file.mode);
 		} else {
-			git_buf_printf(pi->buf, "old mode %o\n", delta->old_file.mode);
-			git_buf_printf(pi->buf, "new mode %o\n", delta->new_file.mode);
+			git_buf_printf(out, "old mode %o\n", delta->old_file.mode);
+			git_buf_printf(out, "new mode %o\n", delta->new_file.mode);
 		}
-		git_buf_printf(pi->buf, "index %s..%s\n", start_oid, end_oid);
+		git_buf_printf(out, "index %s..%s\n", start_oid, end_oid);
 	}
 
-	if (git_buf_oom(pi->buf))
+	if (git_buf_oom(out))
 		return -1;
 
 	return 0;
 }
 
-static int print_patch_file(
+static int diff_print_patch_file(
 	const git_diff_delta *delta, float progress, void *data)
 {
 	diff_print_info *pi = data;
@@ -247,7 +252,7 @@ static int print_patch_file(
 	git_buf_clear(pi->buf);
 	git_buf_printf(pi->buf, "diff --git %s%s %s%s\n", oldpfx, delta->old_file.path, newpfx, delta->new_file.path);
 
-	if (print_oid_range(pi, delta) < 0)
+	if (diff_print_oid_range(pi, delta) < 0)
 		return -1;
 
 	if (git_oid_iszero(&delta->old_file.oid)) {
@@ -288,7 +293,7 @@ static int print_patch_file(
 	return 0;
 }
 
-static int print_patch_hunk(
+static int diff_print_patch_hunk(
 	const git_diff_delta *d,
 	const git_diff_range *r,
 	const char *header,
@@ -311,7 +316,7 @@ static int print_patch_hunk(
 	return 0;
 }
 
-static int print_patch_line(
+static int diff_print_patch_line(
 	const git_diff_delta *delta,
 	const git_diff_range *range,
 	char line_origin, /* GIT_DIFF_LINE value from above */
@@ -343,6 +348,7 @@ static int print_patch_line(
 	return 0;
 }
 
+/* print a git_diff_list to an output callback in patch format */
 int git_diff_print_patch(
 	git_diff_list *diff,
 	git_diff_data_cb print_cb,
@@ -354,27 +360,15 @@ int git_diff_print_patch(
 
 	if (!(error = diff_print_info_init(&pi, &buf, diff, print_cb, payload)))
 		error = git_diff_foreach(
-			diff, print_patch_file, print_patch_hunk, print_patch_line, &pi);
+			diff, diff_print_patch_file, diff_print_patch_hunk,
+			diff_print_patch_line, &pi);
 
 	git_buf_free(&buf);
 
 	return error;
 }
 
-
-static int print_to_buffer_cb(
-	const git_diff_delta *delta,
-	const git_diff_range *range,
-	char line_origin,
-	const char *content,
-	size_t content_len,
-	void *payload)
-{
-	git_buf *output = payload;
-	GIT_UNUSED(delta); GIT_UNUSED(range); GIT_UNUSED(line_origin);
-	return git_buf_put(output, content, content_len);
-}
-
+/* print a git_diff_patch to an output callback */
 int git_diff_patch_print(
 	git_diff_patch *patch,
 	git_diff_data_cb print_cb,
@@ -389,13 +383,28 @@ int git_diff_patch_print(
 	if (!(error = diff_print_info_init(
 			&pi, &temp, git_diff_patch__diff(patch), print_cb, payload)))
 		error = git_diff_patch__invoke_callbacks(
-			patch, print_patch_file, print_patch_hunk, print_patch_line, &pi);
+			patch, diff_print_patch_file, diff_print_patch_hunk,
+			diff_print_patch_line, &pi);
 
 	git_buf_free(&temp);
 
 	return error;
 }
 
+static int diff_print_to_buffer_cb(
+	const git_diff_delta *delta,
+	const git_diff_range *range,
+	char line_origin,
+	const char *content,
+	size_t content_len,
+	void *payload)
+{
+	git_buf *output = payload;
+	GIT_UNUSED(delta); GIT_UNUSED(range); GIT_UNUSED(line_origin);
+	return git_buf_put(output, content, content_len);
+}
+
+/* print a git_diff_patch to a string buffer */
 int git_diff_patch_to_str(
 	char **string,
 	git_diff_patch *patch)
@@ -403,7 +412,7 @@ int git_diff_patch_to_str(
 	int error;
 	git_buf output = GIT_BUF_INIT;
 
-	error = git_diff_patch_print(patch, print_to_buffer_cb, &output);
+	error = git_diff_patch_print(patch, diff_print_to_buffer_cb, &output);
 
 	/* GIT_EUSER means git_buf_put in print_to_buffer_cb returned -1,
 	 * meaning a memory allocation failure, so just map to -1...