Add common substring highlight customization

Completions/_autocomplete__unambiguous

@@ -33,6 +33,9 @@ _requested $tag ||
 
 typeset -g _autocomplete__unambiguous="$compstate[unambiguous]"
 
-builtin compadd -J "$tag" -x $'%{\e[0;2m%}%Bcommon substring:%b %F{0}%K{11}'"$compstate[unambiguous]%f%k"
+# Retrieve highlight value
+builtin zstyle -s ":autocomplete:$curcontext" common-substring-highlight highlight
+
+builtin compadd -J "$tag" -x $'%{\e[0;2m%}%Bcommon substring:%b '"$highlight""$compstate[unambiguous]%f%k"
 
 false

Functions/Init/.autocomplete__config

@@ -162,6 +162,9 @@ builtin zstyle ':completion:*:default' select-prompt '%F{black}%K{12}line %l %p%
 builtin zstyle ':completion:*' insert-sections yes
 builtin zstyle ':completion:*' separate-sections yes
 
+builtin zstyle ':autocomplete:*' common-substring-highlight '%F{0}%K{11}'
+
+
 # Needed for _gnu_generic to prevent descriptions from getting cropped.
 is-at-least 5.9 ||
  builtin zstyle ':completion:*' command '- COLUMNS=999'

README.md

@@ -191,6 +191,15 @@ zstyle ':completion:*:*' matcher-list 'm:{[:lower:]-}={[:upper:]_}' '+r:|[.]=**'
 Note, though, that this will also slightly change what completions are listed initially. This is a
 limitation of the underlying implementation in Zsh.
 
+### Customizing Colors for common-substring-highlight
+You can customize the colors used for highlighting the common substring by changing the last string in the following zstyle:
+```zsh 
+builtin zstyle ':autocomplete:*' common-substring-highlight '%F{0}%K{11}'
+```
+You can control the foreground and background colors:
+ - Foreground Color (%F{X}): The value inside the curly braces (X) corresponds to the text color.
+ - Background Color (%K{Y}): The value inside the curly braces (Y) corresponds to the background color.
+
 ### Make <kbd>Enter</kbd> submit the command line straight from the menu
 By default, pressing <kbd>Enter</kbd> in the menu search exits the search and
 pressing it otherwise in the menu exits the menu. If you instead want to make