2 files changed, 11 insertions, 0 deletions

diff --git a/core/tmux.conf b/core/tmux.conf
index 94316d2..465641c 100644
--- a/core/tmux.conf
+++ b/core/tmux.conf
@@ -1,3 +1,7 @@
+# True-color support regardless of what TERM the outer terminal/distro sets
+set -g default-terminal "tmux-256color"
+set -ga terminal-overrides ",*256col*:Tc"
+
 # Vi mode for copy
 setw -g mode-keys vi
 
diff --git a/core/vim.sh b/core/vim.sh
index 2b2854e..8041e0e 100755
--- a/core/vim.sh
+++ b/core/vim.sh
@@ -37,6 +37,13 @@ set laststatus=2  " permanent status bar
 set statusline=%F  " shows full file path
 
 if (has("termguicolors"))
+  " tmux's terminfo entries (tmux-256color/screen-256color) don't define
+  " setrgbf/setrgbb, so vim has no termcap to build true-color escapes and
+  " silently emits none. Set them explicitly (standard vim+tmux fix).
+  if !empty($TMUX)
+    let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
+    let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
+  endif
   set termguicolors
 endif