Add gat highlighting backend (optional)

NEWS.rst

@@ -10,6 +10,7 @@ Changed
 
 - Use reverse-list layout for fzf/skim instead of reverse
 - pypc: don't add '.' to any dependency list
+- Add optional syntax highlighter backend: gat
 
 0.3.11
 ======

doc/src/deps.md

@@ -55,6 +55,7 @@ with optional additions for more colorful output, alternative json parsers, and
     - [uv](https://github.com/astral-sh/uv/)
       -- for faster performance, leaner venvs, and more operational feedback
     - [highlight](https://repology.org/project/highlight/versions)
+      *or* [gat](https://github.com/koki-develop/gat/)
       *or* [bat](https://repology.org/project/bat/versions)
       *or* [rich-cli](https://github.com/Textualize/rich-cli)
       -- for pretty syntax highlighting; rich-cli adds fancy tables

zpy.plugin.zsh

@@ -108,13 +108,16 @@ ZPY_PROCS=${${$(nproc 2>/dev/null):-$(sysctl -n hw.logicalcpu 2>/dev/null)}:-4}
         # the first of the next. This is true of at least highlight 3.58.
 
         # The method below bypasses both issues consistently
-        # across all known versions of highlight, and still outperforms bat:
+        # across all known versions of highlight, and still outperforms the rest:
         local content=$(<&0)
         if [[ $content ]] {
             local themes=(aiseered blacknblue bluegreen ekvoli navy)
             HIGHLIGHT_OPTIONS=${HIGHLIGHT_OPTIONS:-"-s $themes[RANDOM % $#themes + 1]"} \
             highlight -O truecolor --stdout --force -S $1 <<<$content
         }
+    } elif (( $+commands[gat] )) {  # recommended themes: base16-snazzy, doom-one, gruvbox, onedark, vulcan
+        GAT_THEME=${GAT_THEME:-doom-one} \
+        gat --force-color -l $1
     } elif (( $+commands[bat] )) {  # recommended themes: ansi, zenburn
         BAT_THEME=${BAT_THEME:-ansi} \
         bat --color always --paging never -p -l $1