Add ctrl-y to copy selected into input

doc/tofi.1.md

@@ -66,6 +66,10 @@ the form **--key=value**.
 
 > Delete word.
 
+\<Ctrl\>-y
+
+> Copy current selection into input.
+
 \<Enter\>
 
 > Confirm the current selection and quit.

doc/tofi.1.scd

@@ -57,6 +57,9 @@ All config file options described in *tofi*(5) are also accepted, in the form
 <Ctrl>-w | <Ctrl>-<Backspace>
 	Delete word.
 
+<Ctrl>-y
+	Copy current selection into input.
+
 <Enter>
 	Confirm the current selection and quit.
 

src/input.c

@@ -14,6 +14,7 @@ static void add_character(struct tofi *tofi, xkb_keycode_t keycode);
 static void delete_character(struct tofi *tofi);
 static void delete_word(struct tofi *tofi);
 static void clear_input(struct tofi *tofi);
+static void complete_selection(struct tofi *tofi);
 static void paste(struct tofi *tofi);
 static void select_previous_result(struct tofi *tofi);
 static void select_next_result(struct tofi *tofi);
@@ -68,6 +69,8 @@ void input_handle_keypress(struct tofi *tofi, xkb_keycode_t keycode)
 		clear_input(tofi);
 	} else if (key == KEY_V && ctrl) {
 		paste(tofi);
+	} else if (key == KEY_Y && ctrl) {
+		complete_selection(tofi);
 	} else if (key == KEY_LEFT) {
 		previous_cursor_or_result(tofi);
 	} else if (key == KEY_RIGHT) {
@@ -304,6 +307,55 @@ void clear_input(struct tofi *tofi)
 	input_refresh_results(tofi);
 }
 
+void complete_selection(struct tofi *tofi)
+{
+	struct entry *entry = &tofi->window.entry;
+	uint32_t selection = entry->selection + entry->first_result;
+	char *res = entry->results.buf[selection].string;
+	if (!res) {
+		return;
+	}
+
+	char buffer[5];
+	memset(buffer, 0, N_ELEM(buffer));
+	errno = 0;
+	bool eof = false;
+	size_t pos = 0;
+
+	entry->cursor_position = 0;
+	while (entry->cursor_position < N_ELEM(entry->input_utf32)) {
+		for (size_t i = 0; i < 4; i++) {
+			if (!res[pos]) {
+				eof = true;
+				break;
+			}
+
+			buffer[i] = res[pos];
+			pos += 1;
+			uint32_t unichar = utf8_to_utf32_validate(buffer);
+			if (unichar == (uint32_t)-2) {
+				/* The current character isn't complete yet. */
+				continue;
+			} else if (unichar == (uint32_t)-1) {
+				log_error("Invalid UTF-8 character in clipboard: %s\n", buffer);
+				break;
+			} else {
+				entry->input_utf32[entry->cursor_position] = unichar;
+				entry->cursor_position++;
+				break;
+			}
+		}
+		memset(buffer, 0, N_ELEM(buffer));
+		if (eof) {
+			break;
+		}
+	}
+	entry->input_utf32_length = entry->cursor_position;
+
+	input_refresh_results(tofi);
+	tofi->window.surface.redraw = true;
+}
+
 void paste(struct tofi *tofi)
 {
 	if (tofi->clipboard.wl_data_offer == NULL || tofi->clipboard.mime_type == NULL) {