[Script] Add new-selection option.

Allow you to select an entry (based on view, so might not work in combi
mode).

fixes: #1248

Examples/test_script_mode_color.sh

@@ -10,6 +10,7 @@ then
     # Override the previously set prompt.
     echo -en "\0theme\x1felement-text { background-color: "$@";}\n"
     echo -en "\0keep-selection\x1ftrue\n"
+    echo -en "\0new-selection\x1f2\n"
     echo "red"
     echo "lightgreen"
     echo "lightblue"

source/modes/script.c

@@ -68,6 +68,7 @@ typedef struct {
   char *data;
   gboolean do_markup;
   gboolean keep_selection;
+  int64_t new_selection;
   char delim;
   /** no custom */
   gboolean no_custom;
@@ -138,6 +139,8 @@ static void parse_header_entry(Mode *sw, char *line, ssize_t length) {
       pd->use_hot_keys = (strcasecmp(value, "true") == 0);
     } else if (strcasecmp(line, "keep-selection") == 0) {
       pd->keep_selection = (strcasecmp(value, "true") == 0);
+    } else if (strcasecmp(line, "new-selection") == 0) {
+      pd->new_selection = (int64_t)g_ascii_strtoll(value, NULL, 0);
     } else if (strcasecmp(line, "data") == 0) {
       g_free(pd->data);
       pd->data = g_strdup(value);
@@ -160,7 +163,9 @@ static DmenuScriptEntry *execute_executor(Mode *sw, char *arg,
   char **argv = NULL;
   int argc = 0;
   *length = 0;
-
+  // Reset these between runs.
+  pd->new_selection = -1;
+  pd->keep_selection = -1;
   // Environment
   char **env = g_get_environ();
 
@@ -343,6 +348,11 @@ static ModeMode script_mode_result(Mode *sw, int mretv, char **input,
     rmpd->cmd_list = new_list;
     rmpd->cmd_list_length = new_length;
     if (rmpd->keep_selection) {
+      if (rmpd->new_selection >= 0 &&
+          rmpd->new_selection < rmpd->cmd_list_length) {
+        rofi_view_set_selected_line(rofi_view_get_active(),
+                                    rmpd->new_selection);
+      }
       retv = RELOAD_DIALOG;
     } else {
       retv = RESET_DIALOG;