Support user given text objects

README.asciidoc

@@ -517,6 +517,8 @@ object you want.
  * `␣`: select the whitespaces
  * `i`: select the current indentation block
  * `n`: select the number
+ * `:`: select user defined object, will prompt
+   for open and close text.
 
 For nestable objects, a count can be used in order to specify which surrounding
 level to select.

src/normal.cc

@@ -935,8 +935,28 @@ void select_object(Context& context, NormalParams params)
         }
 
         if (*cp == 'u')
-        {
             return select<mode>(context, std::bind(select_argument, _1, _2, level, flags));
+
+        if (*cp == ':')
+        {
+            context.input_handler().prompt(
+                "opening:", "", get_face("Prompt"), complete_nothing,
+                [level](StringView cmdline, PromptEvent event, Context& context) {
+                    if (event != PromptEvent::Validate)
+                        return;
+
+                    String opening = cmdline.str();
+                    context.input_handler().prompt(
+                        "closing:", "", get_face("Prompt"), complete_nothing,
+                        [level, opening](StringView cmdline, PromptEvent event, Context& context) {
+                            if (event != PromptEvent::Validate)
+                                return;
+
+                            String closing = cmdline.str();
+                            return select<mode>(context, std::bind(select_surrounding, _1, _2,
+                                                                   opening, closing, level, flags));
+                        });
+                });
         }
 
         static constexpr struct
@@ -977,7 +997,8 @@ void select_object(Context& context, NormalParams params)
     "␣:    whitespaces        \n"
     "i:    indent             \n"
     "u:    argument           \n"
-    "n:    number             \n");
+    "n:    number             \n"
+    "::    prompt for object  \n");
 }
 
 template<Key::NamedKey key>

src/selectors.cc

@@ -728,6 +728,12 @@ UnitTest test_find_surrounding{[]()
         auto res = find_surrounding(s, s.begin() + 6, '[', ']', ObjectFlags::ToBegin, 0);
         kak_assert(not res);
     }
+    s = "begin tchou begin tchaa end end";
+    {
+        auto res = find_surrounding(s, s.begin() + 6, "begin", "end",
+                                    ObjectFlags::ToBegin | ObjectFlags::ToEnd, 0);
+        kak_assert(res and StringView{res->first COMMA res->second+1} == s);
+    }
 }};
 
 }