Change color script to awk; add comments to tmux.conf

source/notes/tmux.rst

@@ -100,8 +100,11 @@ For PuTTY you'll need to go to :guilabel:`Configuration` -> :guilabel:`Connectio
    # term
    #
 
+   # Set tmux-256color for tmux for reasons: https://github.com/tmux/tmux/wiki/FAQ
    set -g default-terminal "tmux-256color"
-   set -ga terminal-overrides ",xterm-256color*:Tc"
+
+   # Make sure true color capability "Tc" is set for xterm
+   set -ga terminal-overrides ",xterm*:Tc"
 
    #
    # powerline
@@ -109,50 +112,23 @@ For PuTTY you'll need to go to :guilabel:`Configuration` -> :guilabel:`Connectio
 
    source /lib/python3.10/site-packages/powerline/bindings/tmux/powerline.conf
 
-Python color test script
-------------------------
-
-Here's a python script to make sure your terminal is working with 256 colors.  You may want to run this script both before and after running tmux to verify colors are working correctly
-
-.. code-block:: python
-
-   import sys
-   import os
-
-   def echo(msg):
-       os.system('echo -n "' + str(msg) + '"')
-
-   def out(n):
-       os.system("tput setab " + str(n) + "; echo -n " + ("\"% 4d\"" % n))
-       os.system("tput setab 0")
+Color test script
+-----------------
 
-   # normal colors 1 - 16
-   os.system("tput setaf 16")
-   for n in range(8):
-       out(n)
-   echo("\n")
-   for n in range(8, 16):
-       out(n)
+Here's a script to make sure your terminal is working with true color.  You may want to run this script both before and after running tmux to verify colors are working correctly
 
-   echo("\n")
-   echo("\n")
-
-   y=16
-   while y < 231:
-       for z in range(0,6):
-           out(y)
-           y += 1
-
-       echo("\n")
-
-
-   echo("\n")
-
-   for n in range(232, 256):
-       out(n)
-       if n == 237 or n == 243 or n == 249:
-           echo("\n")
+.. code-block:: shell
 
-   echo("\n")
-   os.system("tput setaf 7")
-   os.system("tput setab 0")
+   awk -v term_cols="${width:-$(tput cols || echo 80)}" 'BEGIN{
+       s="/\\";
+       for (colnum = 0; colnum<term_cols; colnum++) {
+           r = 255-(colnum*255/term_cols);
+           g = (colnum*510/term_cols);
+           b = (colnum*255/term_cols);
+           if (g>255) g = 510-g;
+           printf "\033[48;2;%d;%d;%dm", r,g,b;
+           printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
+           printf "%s\033[0m", substr(s,colnum%2+1,1);
+       }
+       printf "\n";
+   }'