refactor(tui): use nvim_echo() for verbose terminfo

This is needed for #18375 for the obvious reasons.
note: verbose_terminfo_event is only temporarily needed
until the full TUI process refactor is merged.

runtime/doc/api.txt

@@ -717,7 +717,7 @@ nvim_del_var({name})                                          *nvim_del_var()*
     Parameters: ~
       • {name}  Variable name
 
-nvim_echo({chunks}, {history}, {opts})                           *nvim_echo()*
+nvim_echo({chunks}, {history}, {*opts})                          *nvim_echo()*
     Echo a message.
 
     Parameters: ~
@@ -725,7 +725,11 @@ nvim_echo({chunks}, {history}, {opts})                           *nvim_echo()*
                    chunk with specified highlight. `hl_group` element can be
                    omitted for no highlight.
       • {history}  if true, add to |message-history|.
-      • {opts}     Optional parameters. Reserved for future use.
+      • {opts}     Optional parameters.
+                   • verbose: Message was printed as a result of 'verbose'
+                     option if Nvim was invoked with -V3log_file, the message
+                     will be redirected to the log_file and surpressed from
+                     direct output.
 
 nvim_err_write({str})                                       *nvim_err_write()*
     Writes a message to the Vim error buffer. Does not append "\n", the

src/nvim/api/keysets.lua

@@ -219,5 +219,8 @@ return {
   cmd_opts = {
     "output";
   };
+  echo_opts = {
+    "verbose";
+  };
 }
 

src/nvim/api/vim.c

@@ -726,8 +726,11 @@ void nvim_set_vvar(String name, Object value, Error *err)
 ///                text chunk with specified highlight. `hl_group` element
 ///                can be omitted for no highlight.
 /// @param history  if true, add to |message-history|.
-/// @param opts  Optional parameters. Reserved for future use.
-void nvim_echo(Array chunks, Boolean history, Dictionary opts, Error *err)
+/// @param opts  Optional parameters.
+///          - verbose: Message was printed as a result of 'verbose' option
+///            if Nvim was invoked with -V3log_file, the message will be
+///            redirected to the log_file and surpressed from direct output.
+void nvim_echo(Array chunks, Boolean history, Dict(echo_opts) *opts, Error *err)
   FUNC_API_SINCE(7)
 {
   HlMessage hl_msg = parse_hl_msg(chunks, err);
@@ -735,13 +738,19 @@ void nvim_echo(Array chunks, Boolean history, Dictionary opts, Error *err)
     goto error;
   }
 
-  if (opts.size > 0) {
-    api_set_error(err, kErrorTypeValidation, "opts dict isn't empty");
-    goto error;
+  bool verbose = api_object_to_bool(opts->verbose, "verbose", false, err);
+
+  if (verbose) {
+    verbose_enter();
   }
 
   msg_multiattr(hl_msg, history ? "echomsg" : "echo", history);
 
+  if (verbose) {
+    verbose_leave();
+    verbose_stop();  // flush now
+  }
+
   if (history) {
     // history takes ownership
     return;

src/nvim/charset.c

@@ -418,6 +418,22 @@ char *transstr(const char *const s, bool untab)
   return buf;
 }
 
+size_t kv_transstr(StringBuilder *str, const char *const s, bool untab)
+  FUNC_ATTR_NONNULL_ARG(1)
+{
+  if (!s) {
+    return 0;
+  }
+
+  // Compute the length of the result, taking account of unprintable
+  // multi-byte characters.
+  const size_t len = transstr_len(s, untab);
+  kv_ensure_space(*str, len + 1);
+  transstr_buf(s, str->items + str->size, len + 1, untab);
+  str->size += len;  // do not include NUL byte
+  return len;
+}
+
 /// Convert the string "str[orglen]" to do ignore-case comparing.
 /// Use the current locale.
 ///

src/nvim/charset.h

@@ -7,6 +7,7 @@
 #include "nvim/eval/typval.h"
 #include "nvim/option_defs.h"
 #include "nvim/pos.h"
+#include "nvim/strings.h"
 #include "nvim/types.h"
 
 /// Return the folded-case equivalent of the given character

src/nvim/options.lua

@@ -2690,7 +2690,7 @@ return {
       full_name='verbose', abbreviation='vbs',
       short_desc=N_("give informative messages"),
       type='number', scope={'global'},
-      varname='p_verbose',
+      varname='p_verbose', redraw={'ui_option'},
       defaults={if_true=0}
     },
     {

src/nvim/tui/terminfo.c

@@ -7,10 +7,13 @@
 #include <string.h>
 #include <unibilium.h>
 
+#include "nvim/api/private/helpers.h"
+#include "nvim/charset.h"
 #include "nvim/globals.h"
 #include "nvim/memory.h"
 #include "nvim/message.h"
 #include "nvim/option.h"
+#include "nvim/strings.h"
 #include "nvim/tui/terminfo.h"
 #include "nvim/tui/terminfo_defs.h"
 
@@ -147,82 +150,80 @@ unibi_term *terminfo_from_builtin(const char *term, char **termname)
 /// Serves a similar purpose as Vim `:set termcap` (removed in Nvim).
 ///
 /// @note adapted from unibilium unibi-dump.c
-void terminfo_info_msg(const unibi_term *const ut)
+/// @return allocated string
+String terminfo_info_msg(const unibi_term *ut, const char *termname)
 {
-  if (exiting) {
-    return;
-  }
-  msg_puts_title("\n\n--- Terminal info --- {{{\n");
+  StringBuilder data = KV_INITIAL_VALUE;
 
-  char *term;
-  get_tty_option("term", &term);
-  msg_printf_attr(0, "&term: %s\n", term);
-  msg_printf_attr(0, "Description: %s\n", unibi_get_name(ut));
+  kv_printf(data, "&term: %s\n", termname);
+  kv_printf(data, "Description: %s\n", unibi_get_name(ut));
   const char **a = unibi_get_aliases(ut);
   if (*a) {
-    msg_puts("Aliases: ");
+    kv_printf(data, "Aliases: ");
     do {
-      msg_printf_attr(0, "%s%s\n", *a, a[1] ? " | " : "");
+      kv_printf(data, "%s%s\n", *a, a[1] ? " | " : "");
       a++;
     } while (*a);
   }
 
-  msg_puts("Boolean capabilities:\n");
+  kv_printf(data, "Boolean capabilities:\n");
   for (enum unibi_boolean i = unibi_boolean_begin_ + 1;
        i < unibi_boolean_end_; i++) {
-    msg_printf_attr(0, "  %-25s %-10s = %s\n", unibi_name_bool(i),
+    kv_printf(data, "  %-25s %-10s = %s\n", unibi_name_bool(i),
               unibi_short_name_bool(i),
               unibi_get_bool(ut, i) ? "true" : "false");
   }
 
-  msg_puts("Numeric capabilities:\n");
+  kv_printf(data, "Numeric capabilities:\n");
   for (enum unibi_numeric i = unibi_numeric_begin_ + 1;
        i < unibi_numeric_end_; i++) {
     int n = unibi_get_num(ut, i);  // -1 means "empty"
-    msg_printf_attr(0, "  %-25s %-10s = %d\n", unibi_name_num(i),
+    kv_printf(data, "  %-25s %-10s = %d\n", unibi_name_num(i),
               unibi_short_name_num(i), n);
   }
 
-  msg_puts("String capabilities:\n");
+  kv_printf(data, "String capabilities:\n");
   for (enum unibi_string i = unibi_string_begin_ + 1;
        i < unibi_string_end_; i++) {
     const char *s = unibi_get_str(ut, i);
     if (s) {
-      msg_printf_attr(0, "  %-25s %-10s = ", unibi_name_str(i),
+      kv_printf(data, "  %-25s %-10s = ", unibi_name_str(i),
                 unibi_short_name_str(i));
       // Most of these strings will contain escape sequences.
-      msg_outtrans_special(s, false, 0);
-      msg_putchar('\n');
+      kv_transstr(&data, s, false);
+      kv_push(data, '\n');
     }
   }
 
   if (unibi_count_ext_bool(ut)) {
-    msg_puts("Extended boolean capabilities:\n");
+    kv_printf(data, "Extended boolean capabilities:\n");
     for (size_t i = 0; i < unibi_count_ext_bool(ut); i++) {
-      msg_printf_attr(0, "  %-25s = %s\n",
+      kv_printf(data, "  %-25s = %s\n",
                 unibi_get_ext_bool_name(ut, i),
                 unibi_get_ext_bool(ut, i) ? "true" : "false");
     }
   }
 
   if (unibi_count_ext_num(ut)) {
-    msg_puts("Extended numeric capabilities:\n");
+    kv_printf(data, "Extended numeric capabilities:\n");
     for (size_t i = 0; i < unibi_count_ext_num(ut); i++) {
-      msg_printf_attr(0, "  %-25s = %d\n",
+      kv_printf(data, "  %-25s = %d\n",
                 unibi_get_ext_num_name(ut, i),
                 unibi_get_ext_num(ut, i));
     }
   }
 
   if (unibi_count_ext_str(ut)) {
-    msg_puts("Extended string capabilities:\n");
+    kv_printf(data, "Extended string capabilities:\n");
     for (size_t i = 0; i < unibi_count_ext_str(ut); i++) {
-      msg_printf_attr(0, "  %-25s = ", unibi_get_ext_str_name(ut, i));
-      msg_outtrans_special(unibi_get_ext_str(ut, i), false, 0);
-      msg_putchar('\n');
+      kv_printf(data, "  %-25s = ", unibi_get_ext_str_name(ut, i));
+      // NOTE: unibi_get_ext_str(ut, i) might be NULL, as termcap
+      // might include junk data on mac os. kv_transstr will handle this.
+      kv_transstr(&data, unibi_get_ext_str(ut, i), false);
+      kv_push(data, '\n');
     }
   }
+  kv_push(data, NUL);
 
-  msg_puts("}}}\n");
-  xfree(term);
+  return cbuf_as_string(data.items, data.size - 1);
 }

src/nvim/tui/terminfo.h

@@ -3,6 +3,8 @@
 
 #include <unibilium.h>
 
+#include "nvim/api/private/defs.h"
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "tui/terminfo.h.generated.h"
 #endif

src/nvim/tui/tui.c

@@ -15,6 +15,8 @@
 #include "auto/config.h"
 #include "klib/kvec.h"
 #include "nvim/api/private/defs.h"
+#include "nvim/api/private/helpers.h"
+#include "nvim/api/vim.h"
 #include "nvim/ascii.h"
 #include "nvim/event/defs.h"
 #include "nvim/event/loop.h"
@@ -25,10 +27,12 @@
 #include "nvim/grid_defs.h"
 #include "nvim/highlight_defs.h"
 #include "nvim/log.h"
+#include "nvim/macros.h"
 #include "nvim/main.h"
 #include "nvim/mbyte.h"
 #include "nvim/memory.h"
 #include "nvim/message.h"
+#include "nvim/msgpack_rpc/channel.h"
 #include "nvim/option.h"
 #include "nvim/os/input.h"
 #include "nvim/os/os.h"
@@ -98,6 +102,7 @@ struct TUIData {
   TermInput input;
   uv_loop_t write_loop;
   unibi_term *ut;
+  char *term;  // value of $TERM
   union {
     uv_tty_t tty;
     uv_pipe_t pipe;
@@ -132,6 +137,7 @@ struct TUIData {
   bool default_attr;
   bool can_clear_attr;
   ModeShape showing_mode;
+  Integer verbose;
   struct {
     int enable_mouse, disable_mouse;
     int enable_mouse_move, disable_mouse_move;
@@ -295,6 +301,7 @@ static void terminfo_start(UI *ui)
     os_env_var_unlock();
     if (data->ut) {
       termname = xstrdup(term);
+      data->term = xstrdup(term);
     }
   }
   if (!data->ut) {
@@ -509,9 +516,6 @@ static void tui_main(UIBridgeData *bridge, UI *ui)
   // Allow main thread to continue, we are ready to handle UI callbacks.
   CONTINUE(bridge);
 
-  loop_schedule_deferred(&main_loop,
-                         event_create(show_termcap_event, 1, data->ut));
-
   // "Active" loop: first ~100 ms of startup.
   for (size_t ms = 0; ms < 100 && !tui_is_stopped(ui);) {
     ms += (loop_poll_events(&tui_loop, 20) ? 20 : 1);
@@ -533,6 +537,7 @@ static void tui_main(UIBridgeData *bridge, UI *ui)
   kv_destroy(data->invalid_regions);
   kv_destroy(data->attrs);
   xfree(data->space_buf);
+  xfree(data->term);
   xfree(data);
 }
 
@@ -1246,6 +1251,11 @@ static void tui_mode_change(UI *ui, String mode, Integer mode_idx)
   }
 #endif
   tui_set_mode(ui, (ModeShape)mode_idx);
+  if (data->is_starting) {
+    if (data->verbose >= 3) {
+      show_verbose_terminfo(data);
+    }
+  }
   data->is_starting = false;  // mode entered, no longer starting
   data->showing_mode = (ModeShape)mode_idx;
 }
@@ -1390,21 +1400,53 @@ static void tui_flush(UI *ui)
 }
 
 /// Dumps termcap info to the messages area, if 'verbose' >= 3.
-static void show_termcap_event(void **argv)
+static void show_verbose_terminfo(TUIData *data)
 {
-  if (p_verbose < 3) {
-    return;
-  }
-  const unibi_term *const ut = argv[0];
+  const unibi_term *const ut = data->ut;
   if (!ut) {
     abort();
   }
-  verbose_enter();
-  // XXX: (future) if unibi_term is modified (e.g. after a terminal
-  // query-response) this is a race condition.
-  terminfo_info_msg(ut);
-  verbose_leave();
-  verbose_stop();  // flush now
+
+  Array chunks = ARRAY_DICT_INIT;
+  Array title = ARRAY_DICT_INIT;
+  ADD(title, STRING_OBJ(cstr_to_string("\n\n--- Terminal info --- {{{\n")));
+  ADD(title, STRING_OBJ(cstr_to_string("Title")));
+  ADD(chunks, ARRAY_OBJ(title));
+  Array info = ARRAY_DICT_INIT;
+  String str = terminfo_info_msg(ut, data->term);
+  ADD(info, STRING_OBJ(str));
+  ADD(chunks, ARRAY_OBJ(info));
+  Array end_fold = ARRAY_DICT_INIT;
+  ADD(end_fold, STRING_OBJ(cstr_to_string("}}}\n")));
+  ADD(end_fold, STRING_OBJ(cstr_to_string("Title")));
+  ADD(chunks, ARRAY_OBJ(end_fold));
+
+  if (ui_client_channel_id) {
+    Array args = ARRAY_DICT_INIT;
+    ADD(args, ARRAY_OBJ(chunks));
+    ADD(args, BOOLEAN_OBJ(true));  // history
+    Dictionary opts = ARRAY_DICT_INIT;
+    PUT(opts, "verbose", BOOLEAN_OBJ(true));
+    ADD(args, DICTIONARY_OBJ(opts));
+    rpc_send_event(ui_client_channel_id, "nvim_echo", args);
+  } else {
+    loop_schedule_deferred(&main_loop, event_create(verbose_terminfo_event, 2,
+                                                    chunks.items, chunks.size));
+  }
+}
+
+static void verbose_terminfo_event(void **argv)
+{
+  Array chunks = { .items = argv[0], .size = (size_t)argv[1] };
+  Dict(echo_opts) opts = { .verbose = BOOLEAN_OBJ(true) };
+  Error err = ERROR_INIT;
+  nvim_echo(chunks, true, &opts, &err);
+  api_free_array(chunks);
+  if (ERROR_SET(&err)) {
+    fprintf(stderr, "TUI bought the farm: %s\n", err.msg);
+    exit(1);
+  }
+  api_clear_error(&err);
 }
 
 #ifdef UNIX
@@ -1509,6 +1551,8 @@ static void tui_option_set(UI *ui, String name, Object value)
     data->input.ttimeout = value.data.boolean;
   } else if (strequal(name.data, "ttimeoutlen")) {
     data->input.ttimeoutlen = (long)value.data.integer;
+  } else if (strequal(name.data, "verbose")) {
+    data->verbose = value.data.integer;
   }
 }
 

test/functional/ui/options_spec.lua

@@ -24,6 +24,7 @@ describe('UI receives option updates', function()
       termguicolors=false,
       ttimeout=true,
       ttimeoutlen=50,
+      verbose=0,
       ext_cmdline=false,
       ext_popupmenu=false,
       ext_tabline=false,