add nix_shell prompt segment; see #448

config/p10k-classic.zsh

@@ -78,6 +78,7 @@
     nnn                     # nnn shell (https://github.com/jarun/nnn)
     vim_shell               # vim shell indicator (:sh)
     midnight_commander      # midnight commander shell (https://midnight-commander.org/)
+    nix_shell               # nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html)
     vi_mode                 # vi mode (you don't need this if you've enabled prompt_char)
     # vpn_ip                # virtual private network indicator
     # load                  # CPU load
@@ -548,6 +549,16 @@
   # Custom icon.
   # typeset -g POWERLEVEL9K_MIDNIGHT_COMMANDER_VISUAL_IDENTIFIER_EXPANSION='⭐'
 
+  #[ nix_shell: nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html) ]##
+  # Nix shell color.
+  typeset -g POWERLEVEL9K_NIX_SHELL_FOREGROUND=74
+
+  # Tip: If you want to see just the icon without "pure" and "impure", uncomment the next line.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_CONTENT_EXPANSION=
+
+  # Custom icon.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_VISUAL_IDENTIFIER_EXPANSION='⭐'
+
   ##################################[ disk_usgae: disk usage ]##################################
   # Colors for different levels of disk usage.
   typeset -g POWERLEVEL9K_DISK_USAGE_NORMAL_FOREGROUND=35

config/p10k-lean-8colors.zsh

@@ -78,6 +78,7 @@
     nnn                     # nnn shell (https://github.com/jarun/nnn)
     vim_shell               # vim shell indicator (:sh)
     midnight_commander      # midnight commander shell (https://midnight-commander.org/)
+    nix_shell               # nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html)
     # vpn_ip                # virtual private network indicator
     # load                  # CPU load
     # disk_usage            # disk usage
@@ -544,6 +545,16 @@
   # Custom icon.
   # typeset -g POWERLEVEL9K_MIDNIGHT_COMMANDER_VISUAL_IDENTIFIER_EXPANSION='⭐'
 
+  #[ nix_shell: nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html) ]##
+  # Nix shell color.
+  typeset -g POWERLEVEL9K_NIX_SHELL_FOREGROUND=4
+
+  # Tip: If you want to see just the icon without "pure" and "impure", uncomment the next line.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_CONTENT_EXPANSION=
+
+  # Custom icon.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_VISUAL_IDENTIFIER_EXPANSION='⭐'
+
   ##################################[ disk_usgae: disk usage ]##################################
   # Colors for different levels of disk usage.
   typeset -g POWERLEVEL9K_DISK_USAGE_NORMAL_FOREGROUND=2

config/p10k-lean.zsh

@@ -78,6 +78,7 @@
     nnn                     # nnn shell (https://github.com/jarun/nnn)
     vim_shell               # vim shell indicator (:sh)
     midnight_commander      # midnight commander shell (https://midnight-commander.org/)
+    nix_shell               # nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html)
     # vpn_ip                # virtual private network indicator
     # load                  # CPU load
     # disk_usage            # disk usage
@@ -544,6 +545,16 @@
   # Custom icon.
   # typeset -g POWERLEVEL9K_MIDNIGHT_COMMANDER_VISUAL_IDENTIFIER_EXPANSION='⭐'
 
+  #[ nix_shell: nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html) ]##
+  # Nix shell color.
+  typeset -g POWERLEVEL9K_NIX_SHELL_FOREGROUND=74
+
+  # Tip: If you want to see just the icon without "pure" and "impure", uncomment the next line.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_CONTENT_EXPANSION=
+
+  # Custom icon.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_VISUAL_IDENTIFIER_EXPANSION='⭐'
+
   ##################################[ disk_usgae: disk usage ]##################################
   # Colors for different levels of disk usage.
   typeset -g POWERLEVEL9K_DISK_USAGE_NORMAL_FOREGROUND=35

config/p10k-rainbow.zsh

@@ -78,6 +78,7 @@
     nnn                     # nnn shell (https://github.com/jarun/nnn)
     vim_shell               # vim shell indicator (:sh)
     midnight_commander      # midnight commander shell (https://midnight-commander.org/)
+    nix_shell               # nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html)
     vi_mode                 # vi mode (you don't need this if you've enabled prompt_char)
     # vpn_ip                # virtual private network indicator
     # load                  # CPU load
@@ -550,6 +551,17 @@
   # Custom icon.
   # typeset -g POWERLEVEL9K_MIDNIGHT_COMMANDER_VISUAL_IDENTIFIER_EXPANSION='⭐'
 
+  #[ nix_shell: nix shell (https://nixos.org/nixos/nix-pills/developing-with-nix-shell.html) ]##
+  # Nix shell color.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_FOREGROUND=0
+  # typeset -g POWERLEVEL9K_NIX_SHELL_BACKGROUND=4
+
+  # Tip: If you want to see just the icon without "pure" and "impure", uncomment the next line.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_CONTENT_EXPANSION=
+
+  # Custom icon.
+  # typeset -g POWERLEVEL9K_NIX_SHELL_VISUAL_IDENTIFIER_EXPANSION='⭐'
+
   ##################################[ disk_usgae: disk usage ]##################################
   # Colors for different levels of disk usage.
   # typeset -g POWERLEVEL9K_DISK_USAGE_NORMAL_FOREGROUND=3

internal/icons.zsh

@@ -124,6 +124,7 @@ function _p9k_init_icons() {
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
         TIMEWARRIOR_ICON               'tw'
+        NIX_SHELL_ICON                 'nix'
       )
     ;;
     'awesome-fontconfig')
@@ -235,6 +236,7 @@ function _p9k_init_icons() {
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
         TIMEWARRIOR_ICON               'tw'
+        NIX_SHELL_ICON                 'nix'
       )
     ;;
     'awesome-mapped-fontconfig')
@@ -350,6 +352,7 @@ function _p9k_init_icons() {
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
         TIMEWARRIOR_ICON               'tw'
+        NIX_SHELL_ICON                 'nix'
       )
     ;;
     'nerdfont-complete'|'nerdfont-fontconfig')
@@ -462,6 +465,7 @@ function _p9k_init_icons() {
         PERL_ICON                      '\uE769'               # 
         NNN_ICON                       'nnn'
         TIMEWARRIOR_ICON               '\uF132'               # 
+        NIX_SHELL_ICON                 '\uF313'               # 
       )
     ;;
     *)
@@ -573,6 +577,7 @@ function _p9k_init_icons() {
         PERL_ICON                      'perl'
         NNN_ICON                       'nnn'
         TIMEWARRIOR_ICON               'tw'
+        NIX_SHELL_ICON                 'nix'
       )
     ;;
   esac

internal/p10k.zsh

@@ -4289,6 +4289,18 @@ function instant_prompt_vim_shell() {
   _p9k_prompt_segment prompt_vim_shell green $_p9k_color1 VIM_ICON 0 '$VIMRUNTIME' ''
 }
 
+function prompt_nix_shell() {
+  _p9k_prompt_segment $0 4 $_p9k_color1 NIX_SHELL_ICON 0 '' "${(M)IN_NIX_SHELL:#(pure|impure)}"
+}
+
+_p9k_prompt_nix_shell_init() {
+  typeset -g "_p9k__segment_cond_${_p9k_prompt_side}[_p9k_segment_index]"='${IN_NIX_SHELL:#0}'
+}
+
+function instant_prompt_nix_shell() {
+  _p9k_prompt_segment prompt_nix_shell 4 $_p9k_color1 NIX_SHELL_ICON 1 '${IN_NIX_SHELL:#0}' '${(M)IN_NIX_SHELL:#(pure|impure)}'
+}
+
 function prompt_terraform() {
   local ws=default
   if [[ -n $TF_WORKSPACE ]]; then
@@ -6441,7 +6453,7 @@ _p9k_must_init() {
     [[ $sig == $_p9k__param_sig ]] && return 1
     _p9k_deinit
   fi
-  _p9k__param_pat=$'v30\1'${ZSH_VERSION}$'\1'${ZSH_PATCHLEVEL}$'\1'
+  _p9k__param_pat=$'v31\1'${ZSH_VERSION}$'\1'${ZSH_PATCHLEVEL}$'\1'
   _p9k__param_pat+=$'${#parameters[(I)POWERLEVEL9K_*]}\1${(%):-%n%#}\1$GITSTATUS_LOG_LEVEL\1'
   _p9k__param_pat+=$'$GITSTATUS_ENABLE_LOGGING\1$GITSTATUS_DAEMON\1$GITSTATUS_NUM_THREADS\1'
   _p9k__param_pat+=$'$DEFAULT_USER\1${ZLE_RPROMPT_INDENT:-1}\1$P9K_SSH\1$__p9k_ksh_arrays'