support italics in tmux

.tmux.conf

@@ -24,8 +24,8 @@ set -g allow-rename off
 set -g allow-passthrough on
 set -g history-limit 50000
 
-# Allow Spacemacs to correctly show colours
-set -g default-terminal 'screen-256color'
+set -g default-terminal "tmux" # install with tic -x tmux.terminfo
+set-option -sa terminal-overrides ",xterm*:Tc"
 # Send the escape key after 10ms (Defaults to 500ms)
 set -s escape-time 10
 

tmux.terminfo

@@ -0,0 +1,6 @@
+tmux|tmux terminal multiplexer,
+    ritm=\E[23m, rmso=\E[27m, sitm=\E[3m, smso=\E[7m, Ms@,
+    use=xterm+tmux, use=screen,
+
+tmux-256color|tmux with 256 colors,
+    use=xterm+256setaf, use=tmux,