Add option for not overriding OS

config/p10k-classic.zsh

@@ -1622,6 +1622,11 @@
   # really need it.
   typeset -g POWERLEVEL9K_DISABLE_HOT_RELOAD=true
 
+  # Prevent the OS variable from being set.
+  # On Windows P10K sets OS to Windows by default, which can create problems for applications
+  # expecting it to be the default Windows_NT. By enabling this option, P10K won't set OS.
+  #typeset -g POWERLEVEL9K_DONT_SET_OS=true
+
   # If p10k is already loaded, reload configuration.
   # This works even with POWERLEVEL9K_DISABLE_HOT_RELOAD=true.
   (( ! $+functions[p10k] )) || p10k reload

config/p10k-lean-8colors.zsh

@@ -1603,6 +1603,11 @@
   # really need it.
   typeset -g POWERLEVEL9K_DISABLE_HOT_RELOAD=true
 
+  # Prevent the OS variable from being set.
+  # On Windows P10K sets OS to Windows by default, which can create problems for applications
+  # expecting it to be the default Windows_NT. By enabling this option, P10K won't set OS.
+  #typeset -g POWERLEVEL9K_DONT_SET_OS=true
+
   # If p10k is already loaded, reload configuration.
   # This works even with POWERLEVEL9K_DISABLE_HOT_RELOAD=true.
   (( ! $+functions[p10k] )) || p10k reload

config/p10k-lean.zsh

@@ -1599,6 +1599,11 @@
   # really need it.
   typeset -g POWERLEVEL9K_DISABLE_HOT_RELOAD=true
 
+  # Prevent the OS variable from being set.
+  # On Windows P10K sets OS to Windows by default, which can create problems for applications
+  # expecting it to be the default Windows_NT. By enabling this option, P10K won't set OS.
+  #typeset -g POWERLEVEL9K_DONT_SET_OS=true
+
   # If p10k is already loaded, reload configuration.
   # This works even with POWERLEVEL9K_DISABLE_HOT_RELOAD=true.
   (( ! $+functions[p10k] )) || p10k reload

config/p10k-rainbow.zsh

@@ -1710,6 +1710,11 @@
   # really need it.
   typeset -g POWERLEVEL9K_DISABLE_HOT_RELOAD=true
 
+  # Prevent the OS variable from being set.
+  # On Windows P10K sets OS to Windows by default, which can create problems for applications
+  # expecting it to be the default Windows_NT. By enabling this option, P10K won't set OS.
+  #typeset -g POWERLEVEL9K_DONT_SET_OS=true
+
   # If p10k is already loaded, reload configuration.
   # This works even with POWERLEVEL9K_DISABLE_HOT_RELOAD=true.
   (( ! $+functions[p10k] )) || p10k reload

config/p10k-robbyrussell.zsh

@@ -99,6 +99,11 @@
   # really need it.
   typeset -g POWERLEVEL9K_DISABLE_HOT_RELOAD=true
 
+  # Prevent the OS variable from being set.
+  # On Windows P10K sets OS to Windows by default, which can create problems for applications
+  # expecting it to be the default Windows_NT. By enabling this option, P10K won't set OS.
+  #typeset -g POWERLEVEL9K_DONT_SET_OS=true
+
   # If p10k is already loaded, reload configuration.
   # This works even with POWERLEVEL9K_DISABLE_HOT_RELOAD=true.
   (( ! $+functions[p10k] )) || p10k reload

internal/p10k.zsh

@@ -7566,6 +7566,7 @@ _p9k_init_params() {
   _p9k_declare -b POWERLEVEL9K_TIME_UPDATE_ON_COMMAND 0
   # If set to true, time will update every second.
   _p9k_declare -b POWERLEVEL9K_EXPERIMENTAL_TIME_REALTIME 0
+  _p9k_declare -b POWERLEVEL9K_DONT_SET_OS 0
 
   local -i i=1
   while (( i <= $#_POWERLEVEL9K_LEFT_PROMPT_ELEMENTS )); do
@@ -8402,7 +8403,11 @@ function _p9k_init_cacheable() {
   fi
 
   # Someone might be using these.
+  # On Windows OS is already set to Windows_NT,
+  # and setting this to Windows can be problematic
+  if [ $_POWERLEVEL9K_DONT_SET_OS -eq 0 ]; then
   typeset -g OS=$_p9k_os
+  fi
   typeset -g DEFAULT_COLOR=$_p9k_color1
   typeset -g DEFAULT_COLOR_INVERTED=$_p9k_color2