add contextual preview to kks-grep

scripts/kks-grep

@@ -5,12 +5,14 @@
 # requires:
 # - ripgrep (https://github.com/BurntSushi/ripgrep)
 # - fzf (https://github.com/junegunn/fzf)
+# - bat (change to your liking) (https://github.com/sharkdp/bat)
 
 history_file="$HOME/.cache/kks-grep-history"
 
 [ -f "$history_file" ] || touch "$history_file"
 
 rg --vimgrep '.+' "$@" |
-	fzf --height 100% --prompt 'grep> ' --history="$history_file" |
+	fzf -d ':' --height 100% --prompt 'grep> ' --history="$history_file" \
+		--preview='range="$(echo {2}-5 | bc | sed "s/^-.*/0/"):$(echo {2}+20 | bc)"; bat -r "$range" -n --color always -H {2} {1}' |
 	awk -F':' '{print $1 " " "+" $2 ":" $3 }' |
 	xargs -r kks edit