vis: add basic infrastructure to store selections in registers

vis-core.h

@@ -40,6 +40,7 @@ struct Mode {
 };
 
 typedef struct {
+	Array selections;
 	Array values;
 	bool linewise; /* place register content on a new line when inserting? */
 	bool append;

vis-registers.c

@@ -29,13 +29,15 @@ static ssize_t read_buffer(void *context, char *data, size_t len) {
 bool register_init(Register *reg) {
 	Buffer buf;
 	buffer_init(&buf);
+	array_init_sized(&reg->selections, sizeof(SelectionRegion));
 	array_init_sized(&reg->values, sizeof(Buffer));
 	return array_add(&reg->values, &buf);
 }
 
 void register_release(Register *reg) {
 	if (!reg)
 		return;
+	array_release(&reg->selections);
 	size_t n = array_capacity(&reg->values);
 	for (size_t i = 0; i < n; i++)
 		buffer_release(array_get(&reg->values, i));
@@ -239,6 +241,39 @@ const char *vis_register_slot_get(Vis *vis, enum VisRegister id, size_t slot, si
 	return NULL;
 }
 
+Array vis_register_selections_get(Vis *vis, enum VisRegister id) {
+	Array sel;
+	array_init_sized(&sel, sizeof(Filerange));
+	Register *reg = register_from(vis, id);
+	if (!reg)
+		return sel;
+	View *view = vis->win->view;
+	size_t len = array_length(&reg->selections);
+	array_reserve(&sel, len);
+	for (size_t i = 0; i < len; i++) {
+		SelectionRegion *sr = array_get(&reg->selections, i);
+		Filerange r = view_regions_restore(view, sr);
+		if (text_range_valid(&r))
+			array_add(&sel, &r);
+	}
+	//selections_normalize(&sel);
+	return sel;
+}
+
+void vis_register_selections_set(Vis *vis, enum VisRegister id, Array *sel) {
+	Register *reg = register_from(vis, id);
+	if (!reg)
+		return;
+	array_clear(&reg->selections);
+	View *view = vis->win->view;
+	for (size_t i = 0, len = array_length(sel); i < len; i++) {
+		SelectionRegion ss;
+		Filerange *r = array_get(sel, i);
+		if (view_regions_save(view, r, &ss))
+			array_add(&reg->selections, &ss);
+	}
+}
+
 const RegisterDef vis_registers[] = {
 	[VIS_REG_DEFAULT]    = { '"', VIS_HELP("Unnamed register")                                 },
 	[VIS_REG_ZERO]       = { '0', VIS_HELP("Yank register")                                    },

vis.h

@@ -13,6 +13,7 @@ typedef struct Win Win;
 #include "view.h"
 #include "text-regex.h"
 #include "libutf.h"
+#include "array.h"
 
 #ifndef CONFIG_HELP
 #define CONFIG_HELP 1
@@ -754,6 +755,23 @@ const char *vis_register_slot_get(Vis*, enum VisRegister, size_t slot, size_t *l
 /** Set register content. */
 bool vis_register_put(Vis*, enum VisRegister, const char *data, size_t len);
 bool vis_register_slot_put(Vis*, enum VisRegister, size_t slot, const char *data, size_t len);
+/**
+ * Store a set of ``Filerange``s in a register.
+ *
+ * @param id The register to use.
+ * @param sel The array containing the file ranges.
+ */
+void vis_register_selections_set(Vis*, enum VisRegister id, Array *sel);
+/**
+ * Get an array of file ranges stored in the register.
+ *
+ * @rst
+ * .. warning:: The caller must eventually free the Array by calling
+ *              ``array_release``.
+ * @endrst
+ */
+Array vis_register_selections_get(Vis*, enum VisRegister id);
+
 /**
  * @}
  * @defgroup vis_macros