diff: introduce DIFF_PICKAXE_KINDS_MASK

Currently the check whether to perform pickaxing is done via checking
`diffopt->pickaxe`, which contains the command line argument that we
want to pickaxe for. Soon we'll introduce a new type of pickaxing, that
will not store anything in the `.pickaxe` field, so let's migrate the
check to be dependent on pickaxe_opts.

It is not enough to just replace the check for pickaxe by pickaxe_opts,
because flags might be set, but pickaxing was not requested ('-i').
To cope with that, introduce a mask to check only for the bits indicating
the modes of operation.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/log.c

@@ -180,8 +180,8 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 	if (rev->show_notes)
 		init_display_notes(&rev->notes_opt);
 
-	if (rev->diffopt.pickaxe || rev->diffopt.filter ||
+	if ((rev->diffopt.pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) ||
-	    rev->diffopt.flags.follow_renames)
+	    rev->diffopt.filter || rev->diffopt.flags.follow_renames)
 		rev->always_show_header = 0;
 
 	if (source)

combine-diff.c

@@ -1438,7 +1438,7 @@ void diff_tree_combined(const struct object_id *oid,
 			opt->flags.follow_renames	||
 			opt->break_opt != -1	||
 			opt->detect_rename	||
-			opt->pickaxe		||
+			(opt->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)	||
 			opt->filter;
 
 

diff.c

@@ -4173,7 +4173,7 @@ void diff_setup_done(struct diff_options *options)
 	/*
 	 * Also pickaxe would not work very well if you do not say recursive
 	 */
-	if (options->pickaxe)
+	if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
 		options->flags.recursive = 1;
 	/*
 	 * When patches are generated, submodules diffed against the work tree
@@ -5777,7 +5777,7 @@ void diffcore_std(struct diff_options *options)
 		if (options->break_opt != -1)
 			diffcore_merge_broken();
 	}
-	if (options->pickaxe)
+	if (options->pickaxe_opts & DIFF_PICKAXE_KINDS_MASK)
 		diffcore_pickaxe(options);
 	if (options->orderfile)
 		diffcore_order(options->orderfile);

diff.h

@@ -326,6 +326,8 @@ extern void diff_setup_done(struct diff_options *);
 #define DIFF_PICKAXE_KIND_S	4 /* traditional plumbing counter */
 #define DIFF_PICKAXE_KIND_G	8 /* grep in the patch */
 
+#define DIFF_PICKAXE_KINDS_MASK (DIFF_PICKAXE_KIND_S | DIFF_PICKAXE_KIND_G)
+
 #define DIFF_PICKAXE_IGNORE_CASE	32
 
 extern void diffcore_std(struct diff_options *);

revision.c

@@ -2407,7 +2407,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
 		revs->diff = 1;
 
 	/* Pickaxe, diff-filter and rename following need diffs */
-	if (revs->diffopt.pickaxe ||
+	if ((revs->diffopt.pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) ||
 	    revs->diffopt.filter ||
 	    revs->diffopt.flags.follow_renames)
 		revs->diff = 1;