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>

6 files changed, 97 insertions, 78 deletions

diff --git a/Makefile b/Makefile
index b84e182688..efcd63fe6e 100644
--- a/Makefile
+++ b/Makefile
@@ -872,6 +872,7 @@ LIB_OBJS += date.o
 LIB_OBJS += decorate.o
 LIB_OBJS += delta-islands.o
 LIB_OBJS += diff-delta.o
+LIB_OBJS += diff-merges.o
 LIB_OBJS += diff-lib.o
 LIB_OBJS += diff-no-index.o
 LIB_OBJS += diff.o
diff --git a/builtin/log.c b/builtin/log.c
index 717855a49e..ad3092fdd8 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -12,6 +12,7 @@
 #include "color.h"
 #include "commit.h"
 #include "diff.h"
+#include "diff-merges.h"
 #include "revision.h"
 #include "log-tree.h"
 #include "builtin.h"
diff --git a/diff-merges.c b/diff-merges.c
new file mode 100644
index 0000000000..0204292aa9
--- /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;
+		}
+	}
+}
diff --git a/diff-merges.h b/diff-merges.h
new file mode 100644
index 0000000000..7e970b266c
--- /dev/null
+++ b/diff-merges.h
@@ -0,0 +1,18 @@
+#ifndef DIFF_MERGES_H
+#define DIFF_MERGES_H
+
+/*
+ * diff-merges - utility module to handle command-line options for
+ * selection of particular diff format of merge commits
+ * representation.
+ */
+
+struct rev_info;
+
+void init_diff_merge_revs(struct rev_info *revs);
+int parse_diff_merge_opts(struct rev_info *revs, const char **argv);
+void setup_diff_merges_revs(struct rev_info *revs);
+void rev_diff_merges_default_to_dense_combined(struct rev_info *revs);
+void rev_diff_merges_first_parent_defaults_to_enable(struct rev_info *revs);
+
+#endif
diff --git a/revision.c b/revision.c
index 1c224d2764..4bc14a08a6 100644
--- a/revision.c
+++ b/revision.c
@@ -5,6 +5,7 @@
 #include "tree.h"
 #include "commit.h"
 #include "diff.h"
+#include "diff-merges.h"
 #include "refs.h"
 #include "revision.h"
 #include "repository.h"
@@ -1805,8 +1806,6 @@ static int add_parents_only(struct rev_info *revs, const char *arg_, int flags,
 	return 1;
 }
 
-static void init_diff_merge_revs(struct rev_info *revs);
-
 void repo_init_revisions(struct repository *r,
 			 struct rev_info *revs,
 			 const char *prefix)
@@ -2155,79 +2154,6 @@ static void add_message_grep(struct rev_info *revs, const char *pattern)
 	add_grep(revs, pattern, GREP_PATTERN_BODY);
 }
 
-static void init_diff_merge_revs(struct rev_info *revs)
-{
-	revs->ignore_merges = -1;
-}
-
-static 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;
-}
-
-static 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;
-		}
-	}
-}
-
 static int handle_revision_opt(struct rev_info *revs, int argc, const char **argv,
 			       int *unkc, const char **unkv,
 			       const struct setup_revision_opt* opt)
diff --git a/revision.h b/revision.h
index 3dd0229f4e..f6bf860d19 100644
--- a/revision.h
+++ b/revision.h
@@ -456,7 +456,4 @@ int rewrite_parents(struct rev_info *revs,
  */
 struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit);
 
-void rev_diff_merges_default_to_dense_combined(struct rev_info *revs);
-void rev_diff_merges_first_parent_defaults_to_enable(struct rev_info *revs);
-
 #endif