colorize: add $ZSH_COLORIZE_CHROMA_FORMATTER config env var (#8824)

plugins/colorize/README.md

@@ -38,6 +38,14 @@ Pygments offers multiple styles. By default, the `default` style is used, but yo
 ZSH_COLORIZE_STYLE="colorful"
 ```
 
+### Chroma Formatter Settings
+
+Chroma supports terminal output in 8 color, 256 color, and true-color. If you need to change the default terminal output style from the standard 8 color output, set the `ZSH_COLORIZE_CHROMA_FORMATTER` environment variable:
+
+```
+ZSH_COLORIZE_CHROMA_FORMATTER=terminal256
+```
+
 ## Usage
 
 * `ccat <file> [files]`: colorize the contents of the file (or files, if more than one are provided).

plugins/colorize/colorize.plugin.zsh

@@ -46,7 +46,7 @@ colorize_cat() {
         if [[ "$ZSH_COLORIZE_TOOL" == "pygmentize" ]]; then
             pygmentize -O style="$ZSH_COLORIZE_STYLE" -g
         else
-            chroma --style="$ZSH_COLORIZE_STYLE"
+            chroma --style="$ZSH_COLORIZE_STYLE" --formatter="${ZSH_COLORIZE_CHROMA_FORMATTER:-terminal}"
         fi
         return $?
     fi
@@ -62,7 +62,7 @@ colorize_cat() {
                 pygmentize -O style="$ZSH_COLORIZE_STYLE" -g "$FNAME"
             fi
         else
-            chroma --style="$ZSH_COLORIZE_STYLE" "$FNAME"
+            chroma --style="$ZSH_COLORIZE_STYLE" --formatter="${ZSH_COLORIZE_CHROMA_FORMATTER:-terminal}" "$FNAME"
         fi
     done
 }