vis: implement pairwise selection combinator: leftmost

1 files changed, 15 insertions, 0 deletions

diff --git a/main.c b/main.c
index 65f9d59..3905aa6 100644
--- a/main.c
+++ b/main.c
@@ -92,6 +92,7 @@ static Filerange combine_union(const Filerange*, const Filerange*);
 static Filerange combine_intersect(const Filerange*, const Filerange*);
 static Filerange combine_longer(const Filerange*, const Filerange*);
 static Filerange combine_shorter(const Filerange*, const Filerange*);
+static Filerange combine_leftmost(const Filerange*, const Filerange*);
 /* adjust current used count according to keys */
 static const char *count(Vis*, const char *keys, const Arg *arg);
 /* move to the count-th line or if not given either to the first (arg->i < 0)
@@ -304,6 +305,7 @@ enum {
 	VIS_ACTION_SELECTIONS_COMBINE_INTERSECT,
 	VIS_ACTION_SELECTIONS_COMBINE_LONGER,
 	VIS_ACTION_SELECTIONS_COMBINE_SHORTER,
+	VIS_ACTION_SELECTIONS_COMBINE_LEFTMOST,
 	VIS_ACTION_TEXT_OBJECT_WORD_OUTER,
 	VIS_ACTION_TEXT_OBJECT_WORD_INNER,
 	VIS_ACTION_TEXT_OBJECT_LONGWORD_OUTER,
@@ -1114,6 +1116,11 @@ static const KeyAction vis_action[] = {
 		VIS_HELP("Pairwise combine: take shorter")
 		selections_combine, { .combine = combine_shorter }
 	},
+	[VIS_ACTION_SELECTIONS_COMBINE_LEFTMOST] = {
+		"vis-selections-combine-leftmost",
+		VIS_HELP("Pairwise combine: leftmost")
+		selections_combine, { .combine = combine_leftmost }
+	},
 	[VIS_ACTION_TEXT_OBJECT_WORD_OUTER] = {
 		"vis-textobject-word-outer",
 		VIS_HELP("A word leading and trailing whitespace included")
@@ -1853,6 +1860,14 @@ static Filerange combine_shorter(const Filerange *r1, const Filerange *r2) {
 	return l1 < l2 ? *r1 : *r2;
 }
 
+static Filerange combine_leftmost(const Filerange *r1, const Filerange *r2) {
+	if (!r1)
+		return *r2;
+	if (!r2)
+		return *r1;
+	return r1->start < r2->start || (r1->start == r2->start && r1->end < r2->end) ? *r1 : *r2;
+}
+
 static const char *selections_combine(Vis *vis, const char *keys, const Arg *arg) {
 	View *view = vis_view(vis);
 	enum VisRegister reg = vis_register_used(vis);