define instant_prompt_example to demonstrate how to add segments to instant prompt

config/p10k-classic.zsh

@@ -809,9 +809,28 @@
     p10k segment -f 208 -i '⭐' -t 'hello, %n'
   }
 
+  # User-defined prompt segments may optionally provide an instant_prompt_* function. Its job
+  # is to generate the prompt segment for display in instant prompt. See
+  # https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt.
+  #
+  # Powerlevel10k will call instant_prompt_* at the same time as the regular prompt_* function
+  # and will record all `p10k segment` calls it makes. When displaying instant prompt, Powerlevel10k
+  # will replay these calls without actually calling instant_prompt_*. It is imperative that
+  # instant_prompt_* always makes the same `p10k segment` calls regardless of environment. If this
+  # rule is not observed, the content of instant prompt will be incorrect.
+  #
+  # Usually, you should either not define instant_prompt_* or simply call prompt_* from it. If
+  # instant_prompt_* is not defined for a segment, the segment won't be shown in instant prompt.
+  function instant_prompt_example() {
+    # Since prompt_example always makes the same `p10k segment` calls, we can call it from
+    # instant_prompt_example. This will give us the same `example` prompt segment in the instant
+    # and regular prompts.
+    prompt_example
+  }
+
   # User-defined prompt segments can be customized the same way as built-in segments.
-  typeset -g POWERLEVEL9K_EXAMPLE_FOREGROUND=208
-  typeset -g POWERLEVEL9K_EXAMPLE_VISUAL_IDENTIFIER_EXPANSION='${P9K_VISUAL_IDENTIFIER}'
+  # typeset -g POWERLEVEL9K_EXAMPLE_FOREGROUND=208
+  # typeset -g POWERLEVEL9K_EXAMPLE_VISUAL_IDENTIFIER_EXPANSION='⭐'
 
   # Instant prompt mode.
   #

config/p10k-lean.zsh

@@ -789,9 +789,28 @@
     p10k segment -f 208 -i '⭐' -t 'hello, %n'
   }
 
+  # User-defined prompt segments may optionally provide an instant_prompt_* function. Its job
+  # is to generate the prompt segment for display in instant prompt. See
+  # https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt.
+  #
+  # Powerlevel10k will call instant_prompt_* at the same time as the regular prompt_* function
+  # and will record all `p10k segment` calls it makes. When displaying instant prompt, Powerlevel10k
+  # will replay these calls without actually calling instant_prompt_*. It is imperative that
+  # instant_prompt_* always makes the same `p10k segment` calls regardless of environment. If this
+  # rule is not observed, the content of instant prompt will be incorrect.
+  #
+  # Usually, you should either not define instant_prompt_* or simply call prompt_* from it. If
+  # instant_prompt_* is not defined for a segment, the segment won't be shown in instant prompt.
+  function instant_prompt_example() {
+    # Since prompt_example always makes the same `p10k segment` calls, we can call it from
+    # instant_prompt_example. This will give us the same `example` prompt segment in the instant
+    # and regular prompts.
+    prompt_example
+  }
+
   # User-defined prompt segments can be customized the same way as built-in segments.
-  typeset -g POWERLEVEL9K_EXAMPLE_FOREGROUND=208
-  typeset -g POWERLEVEL9K_EXAMPLE_VISUAL_IDENTIFIER_EXPANSION='${P9K_VISUAL_IDENTIFIER}'
+  # typeset -g POWERLEVEL9K_EXAMPLE_FOREGROUND=208
+  # typeset -g POWERLEVEL9K_EXAMPLE_VISUAL_IDENTIFIER_EXPANSION='⭐'
 
   # Instant prompt mode.
   #

config/p10k-rainbow.zsh

@@ -828,16 +828,36 @@
 
   # Example of a user-defined prompt segment. Function prompt_example will be called on every
   # prompt if `example` prompt segment is added to POWERLEVEL9K_LEFT_PROMPT_ELEMENTS or
-  # POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS. It displays an icon and orange text greeting the user.
+  # POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS. It displays an icon and yellow text on red background
+  # greeting the user.
   #
   # Type `p10k help segment` for documentation and a more sophisticated example.
   function prompt_example() {
-    p10k segment -b red -f yellow -i '⭐' -t 'hello, %n'
+    p10k segment -b 1 -f 3 -i '⭐' -t 'hello, %n'
+  }
+
+  # User-defined prompt segments may optionally provide an instant_prompt_* function. Its job
+  # is to generate the prompt segment for display in instant prompt. See
+  # https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt.
+  #
+  # Powerlevel10k will call instant_prompt_* at the same time as the regular prompt_* function
+  # and will record all `p10k segment` calls it makes. When displaying instant prompt, Powerlevel10k
+  # will replay these calls without actually calling instant_prompt_*. It is imperative that
+  # instant_prompt_* always makes the same `p10k segment` calls regardless of environment. If this
+  # rule is not observed, the content of instant prompt will be incorrect.
+  #
+  # Usually, you should either not define instant_prompt_* or simply call prompt_* from it. If
+  # instant_prompt_* is not defined for a segment, the segment won't be shown in instant prompt.
+  function instant_prompt_example() {
+    # Since prompt_example always makes the same `p10k segment` calls, we can call it from
+    # instant_prompt_example. This will give us the same `example` prompt segment in the instant
+    # and regular prompts.
+    prompt_example
   }
 
   # User-defined prompt segments can be customized the same way as built-in segments.
-  # typeset -g POWERLEVEL9K_EXAMPLE_FOREGROUND=4
-  typeset -g POWERLEVEL9K_EXAMPLE_VISUAL_IDENTIFIER_EXPANSION='${P9K_VISUAL_IDENTIFIER}'
+  # typeset -g POWERLEVEL9K_EXAMPLE_FOREGROUND=3
+  # typeset -g POWERLEVEL9K_EXAMPLE_VISUAL_IDENTIFIER_EXPANSION='⭐'
 
   # Instant prompt mode.
   #