ext_cmdline: added cmdline level

add cchar_to_string

src/nvim/api/private/helpers.c

@@ -667,6 +667,22 @@ tabpage_T *find_tab_by_handle(Tabpage tabpage, Error *err)
   return rv;
 }
 
+/// Allocates a String consisting of a single char. Does not support multibyte
+/// characters. The resulting string is also NUL-terminated, to facilitate
+/// interoperating with code using C strings.
+///
+/// @param char the char to convert
+/// @return the resulting String, if the input char was NUL, an
+///         empty String is returned
+String cchar_to_string(char c)
+{
+  char buf[] = { c, NUL };
+  return (String) {
+    .data = xmemdupz(buf, 1),
+    .size = (c != NUL) ? 1 : 0
+  };
+}
+
 /// Copies a C string into a String (binary safe string, characters + length).
 /// The resulting string is also NUL-terminated, to facilitate interoperating
 /// with code using C strings.

src/nvim/api/ui_events.in.h

@@ -67,16 +67,13 @@ 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_enter(void)
+void cmdline_show(Array content, Integer pos, String firstc, String prompt, Integer level)
     FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
-void cmdline_show(Array content, Integer pos, String firstc, String prompt)
+void cmdline_pos(Integer pos, Integer level)
     FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
-void cmdline_pos(Integer pos)
+void cmdline_char(String c, Integer shift, Integer level)
     FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
-void cmdline_char(String c, Integer shift)
-    FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
-void cmdline_hide(void)
+void cmdline_hide(Integer level)
     FUNC_API_SINCE(3) FUNC_API_REMOTE_ONLY;
 
 #endif  // NVIM_API_UI_EVENTS_IN_H

src/nvim/ex_getln.c

@@ -91,6 +91,7 @@ struct cmdline_info {
   int input_fn;                 // when TRUE Invoked for input() function
   unsigned prompt_id;  ///< Prompt number, used to disable coloring on errors.
   Callback highlight_callback;  ///< Callback used for coloring user input.
+  int level;                    // current cmdline level
 };
 /// Last value of prompt_id, incremented when doing new prompt
 static unsigned last_prompt_id = 0;
@@ -238,7 +239,9 @@ static uint8_t *command_line_enter(int firstc, long count, int indent)
     cmd_hkmap = 0;
   }
 
+  // TODO(bfredl): can these be combined?
   ccline.prompt_id = last_prompt_id++;
+  ccline.level++;
   ccline.overstrike = false;                // always start in insert mode
   clearpos(&s->match_end);
   s->save_cursor = curwin->w_cursor;        // may be restored later
@@ -414,6 +417,11 @@ static uint8_t *command_line_enter(int firstc, long count, int indent)
 
     // Make ccline empty, getcmdline() may try to use it.
     ccline.cmdbuff = NULL;
+
+    if (ui_is_external(kUICmdline)) {
+      ui_call_cmdline_hide(ccline.level);
+    }
+    ccline.level--;
     return p;
   }
 }
@@ -1830,14 +1838,7 @@ getcmdline (
     int indent               // indent for inside conditionals
 )
 {
-  if (ui_is_external(kUICmdline)) {
-    ui_call_cmdline_enter();
-  }
-  char_u *p = command_line_enter(firstc, count, indent);
-  if (ui_is_external(kUICmdline)) {
-    ui_call_cmdline_hide();
-  }
-  return p;
+  return command_line_enter(firstc, count, indent);
 }
 
 /// Get a command line with a prompt
@@ -2725,12 +2726,7 @@ void ui_ext_cmdline_show(void)
   ADD(text, STRING_OBJ(cstr_to_string("Normal")));
   ADD(text, STRING_OBJ(cstr_to_string((char *)(ccline.cmdbuff))));
   ADD(content, ARRAY_OBJ(text));
-    char *firstc = (char []) { (char)ccline.cmdfirstc };
-    String str = (String) {
-        .data = xmemdupz(firstc, 1),
-        .size = 1
-    };
-    ui_call_cmdline_show(content, ccline.cmdpos, str, cstr_to_string((char *)(ccline.cmdprompt)));
+  ui_call_cmdline_show(content, ccline.cmdpos, cchar_to_string((char)ccline.cmdfirstc), cstr_to_string((char *)(ccline.cmdprompt)), ccline.level);
 }
 
 /*
@@ -2750,7 +2746,7 @@ void putcmdline(int c, int shift)
       draw_cmdline(ccline.cmdpos, ccline.cmdlen - ccline.cmdpos);
     msg_no_more = FALSE;
   } else {
-    ui_call_cmdline_char(cstr_to_string((char *)(&c)), shift);
+    ui_call_cmdline_char(cchar_to_string((char)(c)), shift, ccline.level);
   }
   cursorcmd();
   ui_cursor_shape();
@@ -3178,7 +3174,7 @@ static void cursorcmd(void)
     return;
 
   if (ui_is_external(kUICmdline)) {
-    ui_call_cmdline_pos(ccline.cmdpos);
+    ui_call_cmdline_pos(ccline.cmdpos, ccline.level);
     return;
   }
 

test/functional/ui/cmdline_spec.lua

@@ -7,19 +7,19 @@ 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
+  local firstc, prompt, content, pos, char, shift, level, current_hide_level
 
   before_each(function()
     clear()
     screen = Screen.new(25, 5)
     screen:attach({rgb=true, ext_cmdline=true})
     screen:set_on_event_handler(function(name, data)
-      if name == "cmdline_enter" then
-        shown = true
-      elseif name == "cmdline_hide" then
+      if name == "cmdline_hide" then
         shown = false
+        current_hide_level = data[1]
       elseif name == "cmdline_show" then
-        content, pos, firstc, prompt = unpack(data)
+        shown = true
+        content, pos, firstc, prompt, level = unpack(data)
       elseif name == "cmdline_char" then
         char, shift = unpack(data)
       elseif name == "cmdline_pos" then
@@ -107,9 +107,34 @@ describe('External command line completion', function()
         eq("input", prompt)
         eq({{'Normal', 'default'}}, content)
       end)
+      feed('<cr>')
+
+      feed(':')
+      screen:expect([[
+        ^                         |
+        ~                        |
+        ~                        |
+        ~                        |
+                                 |
+      ]], nil, nil, function()
+        eq(1, level)
+      end)
+
+      feed('<C-R>=1+2')
+      screen:expect([[
+        ^                         |
+        ~                        |
+        ~                        |
+        ~                        |
+                                 |
+      ]], nil, nil, function()
+        eq({{'Normal', '1+2'}}, content)
+        eq("\"", char)
+        eq(1, shift)
+        eq(2, level)
+      end)
 
       feed('<cr>')
-      feed(':<C-R>=1+2<cr>')
       screen:expect([[
         ^                         |
         ~                        |
@@ -118,8 +143,19 @@ describe('External command line completion', function()
                                  |
       ]], nil, nil, function()
         eq({{'Normal', '3'}}, content)
-        eq("\"", char)
-        eq(1, shift)
+        eq(2, current_hide_level)
+        eq(1, level)
+      end)
+
+      feed('<esc>')
+      screen:expect([[
+        ^                         |
+        ~                        |
+        ~                        |
+        ~                        |
+                                 |
+      ]], nil, nil, function()
+        eq(1, current_hide_level)
       end)
 
     end)