Merge #9347 from justinmk/tui-bsd

TUI: detect BSD vt console

src/nvim/tui/terminfo.c

@@ -13,6 +13,7 @@
 #include "nvim/memory.h"
 #include "nvim/message.h"
 #include "nvim/option.h"
+#include "nvim/os/os.h"
 #include "nvim/tui/terminfo.h"
 #include "nvim/tui/terminfo_defs.h"
 
@@ -33,6 +34,24 @@ bool terminfo_is_term_family(const char *term, const char *family)
     && ('\0' == term[flen] || '-' == term[flen]);
 }
 
+bool terminfo_is_bsd_console(const char *term)
+{
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) \
+  || defined(__DragonFly__)
+  if (strequal(term, "vt220")         // OpenBSD
+      || strequal(term, "vt100")) {   // NetBSD
+    return true;
+  }
+# if defined(__FreeBSD__)
+  // FreeBSD console sets TERM=xterm, but it does not support xterm features
+  // like cursor-shaping. Assume that TERM=xterm is degraded. #8644
+  return strequal(term, "xterm") && !!os_getenv("XTERM_VERSION");
+# endif
+#else
+  return false;
+#endif
+}
+
 /// Loads a built-in terminfo db when we (unibilium) failed to load a terminfo
 /// record from the environment (termcap systems, unrecognized $TERM, …).
 /// We do not attempt to detect xterm pretenders here.

src/nvim/tui/tui.c

@@ -1477,6 +1477,7 @@ static void patch_terminfo_bugs(TUIData *data, const char *term,
     || terminfo_is_term_family(term, "nsterm");
   bool kitty = terminfo_is_term_family(term, "xterm-kitty");
   bool linuxvt = terminfo_is_term_family(term, "linux");
+  bool bsdvt = terminfo_is_bsd_console(term);
   bool rxvt = terminfo_is_term_family(term, "rxvt");
   bool teraterm = terminfo_is_term_family(term, "teraterm");
   bool putty = terminfo_is_term_family(term, "putty");
@@ -1497,7 +1498,7 @@ static void patch_terminfo_bugs(TUIData *data, const char *term,
     && strstr(colorterm, "gnome-terminal");
   bool mate_pretending_xterm = xterm && colorterm
     && strstr(colorterm, "mate-terminal");
-  bool true_xterm = xterm && !!xterm_version;
+  bool true_xterm = xterm && !!xterm_version && !bsdvt;
 
   char *fix_normal = (char *)unibi_get_str(ut, unibi_cursor_normal);
   if (fix_normal) {
@@ -1670,7 +1671,7 @@ static void patch_terminfo_bugs(TUIData *data, const char *term,
   if (-1 == data->unibi_ext.set_cursor_style) {
     // DECSCUSR (cursor shape) is widely supported.
     // https://github.com/gnachman/iTerm2/pull/92
-    if ((!konsolev || konsolev >= 180770)
+    if ((!bsdvt && (!konsolev || konsolev >= 180770))
         && ((xterm && !vte_version)  // anything claiming xterm compat
             // per MinTTY 0.4.3-1 release notes from 2009
             || putty
@@ -1754,7 +1755,10 @@ static void augment_terminfo(TUIData *data, const char *term,
                              long konsolev, bool iterm_env)
 {
   unibi_term *ut = data->ut;
-  bool xterm = terminfo_is_term_family(term, "xterm");
+  bool xterm = terminfo_is_term_family(term, "xterm")
+    // Treat Terminal.app as generic xterm-like, for now.
+    || terminfo_is_term_family(term, "nsterm");
+  bool bsdvt = terminfo_is_bsd_console(term);
   bool dtterm = terminfo_is_term_family(term, "dtterm");
   bool rxvt = terminfo_is_term_family(term, "rxvt");
   bool teraterm = terminfo_is_term_family(term, "teraterm");
@@ -1770,7 +1774,7 @@ static void augment_terminfo(TUIData *data, const char *term,
   bool iterm_pretending_xterm = xterm && iterm_env;
 
   const char *xterm_version = os_getenv("XTERM_VERSION");
-  bool true_xterm = xterm && !!xterm_version;
+  bool true_xterm = xterm && !!xterm_version && !bsdvt;
 
   // Only define this capability for terminal types that we know understand it.
   if (dtterm         // originated this extension