ext_cmdline: extend "function" to generic "block" mechanism

src/nvim/api/ui_events.in.h

@@ -67,6 +67,7 @@ void popupmenu_select(Integer selected)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
 void tabline_update(Tabpage current, Array tabs)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
+
 void cmdline_show(Array content, Integer pos, String firstc, String prompt,
                   Integer indent, Integer level)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
@@ -76,9 +77,11 @@ void cmdline_char(String c, Integer shift, Integer level)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
 void cmdline_hide(Integer level)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
-void cmdline_function_show(void)
+void cmdline_block_show(Array lines)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
-void cmdline_function_hide(void)
+void cmdline_block_append(Array lines)
+  FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
+void cmdline_block_hide(void)
   FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
 
 #endif  // NVIM_API_UI_EVENTS_IN_H

src/nvim/eval.c

@@ -19643,6 +19643,7 @@ void ex_function(exarg_T *eap)
   int todo;
   hashitem_T  *hi;
   int sourcing_lnum_off;
+  bool show_block = false;
 
   /*
    * ":function" without argument: list functions.
@@ -19816,8 +19817,9 @@ void ex_function(exarg_T *eap)
     goto errret_2;
   }
 
-  if (ui_is_external(kUICmdline)) {
+  if (KeyTyped && ui_is_external(kUICmdline)) {
-    ui_call_cmdline_function_show();
+    show_block = true;
+    ui_ext_cmdline_block_append(0, (const char *)eap->cmd);
   }
 
   // find extra arguments "range", "dict", "abort" and "closure"
@@ -19908,6 +19910,9 @@ void ex_function(exarg_T *eap)
       EMSG(_("E126: Missing :endfunction"));
       goto erret;
     }
+    if (show_block) {
+      ui_ext_cmdline_block_append(indent, (const char *)theline);
+    }
 
     /* Detect line continuation: sourcing_lnum increased more than one. */
     if (sourcing_lnum > sourcing_lnum_off + 1)
@@ -20200,8 +20205,8 @@ ret_free:
   xfree(name);
   did_emsg |= saved_did_emsg;
   need_wait_return |= saved_wait_return;
-  if (ui_is_external(kUICmdline)) {
+  if (show_block) {
-    ui_call_cmdline_function_hide();
+    ui_ext_cmdline_block_leave();
   }
 }
 

src/nvim/ex_getln.c

@@ -186,6 +186,8 @@ static int cmd_showtail;                /* Only show path tail in lists ? */
 
 static int new_cmdpos;          /* position set by set_cmdline_pos() */
 
+static Array cmdline_block;  ///< currently displayed block of context
+
 /*
  * Type used by call_user_expand_func
  */
@@ -2759,6 +2761,32 @@ void ui_ext_cmdline_show(void)
                        ccline.level);
 }
 
+void ui_ext_cmdline_block_append(int indent, const char *line)
+{
+  char *buf = xmallocz(indent + strlen(line));
+  memset(buf, ' ', indent);
+  memcpy(buf+indent, line, strlen(line));
+
+  Array item = ARRAY_DICT_INIT;
+  ADD(item, DICTIONARY_OBJ((Dictionary)ARRAY_DICT_INIT));
+  ADD(item, STRING_OBJ(cstr_as_string(buf)));
+  Array content = ARRAY_DICT_INIT;
+  ADD(content, ARRAY_OBJ(item));
+  ADD(cmdline_block, ARRAY_OBJ(content));
+  if (cmdline_block.size > 1) {
+    ui_call_cmdline_block_append(copy_array(content));
+  } else {
+    ui_call_cmdline_block_show(copy_array(cmdline_block));
+  }
+}
+
+void ui_ext_cmdline_block_leave(void)
+{
+  api_free_array(cmdline_block);
+  ui_call_cmdline_block_hide();
+}
+
+
 /*
  * Put a character on the command line.  Shifts the following text to the
  * right when "shift" is TRUE.  Used for CTRL-V, CTRL-K, etc.

test/functional/ui/cmdline_spec.lua

@@ -8,7 +8,7 @@ if helpers.pending_win32(pending) then return end
 describe('External command line completion', function()
   local screen
   local shown = false
-  local firstc, prompt, content, pos, char, shift, indent, level, current_hide_level, in_function
+  local firstc, prompt, content, pos, char, shift, indent, level, current_hide_level, in_block
 
   before_each(function()
     clear()
@@ -25,10 +25,10 @@ describe('External command line completion', function()
         char, shift = unpack(data)
       elseif name == "cmdline_pos" then
         pos = data[1]
-      elseif name == "cmdline_function_show" then
+      elseif name == "cmdline_block_show" then
-        in_function = true
+        in_block = true
-      elseif name == "cmdline_function_hide" then
+      elseif name == "cmdline_block_hide" then
-        in_function = false
+        in_block = false
       end
     end)
   end)
@@ -187,7 +187,7 @@ describe('External command line completion', function()
         ~                        |
                                  |
       ]], nil, nil, function()
-        eq(true, in_function)
+        eq(true, in_block)
         eq(2, indent)
       end)
 
@@ -199,7 +199,7 @@ describe('External command line completion', function()
         ~                        |
                                  |
       ]], nil, nil, function()
-        eq(true, in_function)
+        eq(true, in_block)
         eq(2, indent)
       end)
 
@@ -211,7 +211,7 @@ describe('External command line completion', function()
         ~                        |
                                  |
       ]], nil, nil, function()
-        eq(false, in_function)
+        eq(false, in_block)
       end)
 
       feed(':sign<c-f>')
@@ -222,7 +222,7 @@ describe('External command line completion', function()
         [Command Line]           |
                                  |
       ]], nil, nil, function()
-        eq(false, in_function)
+        eq(false, in_block)
       end)
 
     end)