show tmux info when using tmux

bashrc

@@ -454,6 +454,14 @@ ip-address(){
     test -n "$ip" && printf $1 $ip
 }
 
+__my_ps1_tmux(){
+    local last=$?
+    if test -n "$TMUX"
+    then
+        echo "[TMUX:$TMUX_PANE]"
+    fi
+    return $last
+}
 __my_ps1_moc(){
     local last=$?
     __my_moc_state "[MOC:%s]"
@@ -461,6 +469,7 @@ __my_ps1_moc(){
 }
 __my_ps1_git(){
     local last=$?
+    null type __git_ps1 || return $last
     __try_exec __git_ps1 "[GIT:$(__try_exec git config --get user.name):%s]"
     return $last
 }
@@ -495,7 +504,7 @@ then
     __my_cdef="\[\e[0m\]"
 fi
 _PS1="\
-${__my_c4}:: ${__my_cdef}[${__my_c1}\w/${__my_cdef}<${__my_c3}\${OLDPWD}${__my_cdef}]\$(__my_ps1_git)\$(__my_ps1_bttry)\$(__my_ps1_ipaddr)\$(__my_ps1_moc)\n\
+${__my_c4}:: ${__my_cdef}[${__my_c1}\w/${__my_cdef}<${__my_c3}\${OLDPWD}${__my_cdef}]\$(__my_ps1_tmux)\$(__my_ps1_git)\$(__my_ps1_bttry)\$(__my_ps1_ipaddr)\$(__my_ps1_moc)\n\
 ${__my_c4}:: ${__my_c2}\u@\H${__my_cdef} \D{%a, %d %b %Y %T %z} ${SHELL} \V\n\
 ${__my_c4}:: ${__my_cdef}shlv:${SHLVL} cnum:\# jobs:\j last:\$? \$ "
 PS1=$_PS1