revision: move diff merges functions to its own diff-merges.c

Create separate diff-merges.c and diff-merges.h files, and move all
the code related to handling of diff merges there.

Signed-off-by: Sergey Organov <sorganov@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/diff-merges.c b/diff-merges.c
new file mode 100644
index 0000000..0204292
--- /dev/null
+++ b/diff-merges.c
@@ -0,0 +1,76 @@
+#include "diff-merges.h"
+
+#include "revision.h"
+
+void init_diff_merge_revs(struct rev_info *revs)
+{
+	revs->ignore_merges = -1;
+}
+
+int parse_diff_merge_opts(struct rev_info *revs, const char **argv)
+{
+	int argcount = 1;
+	const char *optarg;
+	const char *arg = argv[0];
+
+	if (!strcmp(arg, "-m")) {
+		/*
+		 * To "diff-index", "-m" means "match missing", and to the "log"
+		 * family of commands, it means "show full diff for merges". Set
+		 * both fields appropriately.
+		 */
+		revs->ignore_merges = 0;
+		revs->match_missing = 1;
+	} else if (!strcmp(arg, "-c")) {
+		revs->diff = 1;
+		revs->dense_combined_merges = 0;
+		revs->combine_merges = 1;
+	} else if (!strcmp(arg, "--cc")) {
+		revs->diff = 1;
+		revs->dense_combined_merges = 1;
+		revs->combine_merges = 1;
+	} else if (!strcmp(arg, "--no-diff-merges")) {
+		revs->ignore_merges = 1;
+	} else if (!strcmp(arg, "--combined-all-paths")) {
+		revs->diff = 1;
+		revs->combined_all_paths = 1;
+	} else if ((argcount = parse_long_opt("diff-merges", argv, &optarg))) {
+		if (!strcmp(optarg, "off")) {
+			revs->ignore_merges = 1;
+		} else {
+			die(_("unknown value for --diff-merges: %s"), optarg);
+		}
+	} else
+		argcount = 0;
+
+	return argcount;
+}
+
+void setup_diff_merges_revs(struct rev_info *revs)
+{
+	if (revs->combine_merges && revs->ignore_merges < 0)
+		revs->ignore_merges = 0;
+	if (revs->ignore_merges < 0)
+		revs->ignore_merges = 1;
+	if (revs->combined_all_paths && !revs->combine_merges)
+		die("--combined-all-paths makes no sense without -c or --cc");
+}
+
+void rev_diff_merges_first_parent_defaults_to_enable(struct rev_info *revs)
+{
+	if (revs->first_parent_only && revs->ignore_merges < 0)
+		revs->ignore_merges = 0;
+}
+
+void rev_diff_merges_default_to_dense_combined(struct rev_info *revs)
+{
+	if (revs->ignore_merges < 0) {
+		/* There was no "-m" variant on the command line */
+		revs->ignore_merges = 0;
+		if (!revs->first_parent_only && !revs->combine_merges) {
+			/* No "--first-parent", "-c", or "--cc" */
+			revs->combine_merges = 1;
+			revs->dense_combined_merges = 1;
+		}
+	}
+}