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colorcat.bash

#!/usr/bin/env bash

# All my gist code is licensed under the MIT license.

# Video demo: https://www.youtube.com/watch?v=y542zPAPeG4

# colorcat
# - cats a file, but if any line contains N hex colors, it appends the colors
#   (rendered as ansi escape sequences) to the end of the line.
# - input can be stdin, a file, or a hex color in plain text
if [[ "$#" -eq 1 && ! -f "$1" ]]; then
  echo "$1"
else
  cat "$@"
fi | while read -r line; do
  colors=""
  for word in $line; do
    if [[ "$word" =~ ^[^A-Fa-f0-9]*#?([A-Fa-f0-9]{6})[^A-Fa-f0-9]*$ ]]; then
      hex=${BASH_REMATCH[1]}
      r=$((16#${hex:0:2}))
      g=$((16#${hex:2:2}))
      b=$((16#${hex:4:2}))
      truecolor="\033[48;2;${r};${g};${b}m"
      reset="\033[0m"
      colors="${colors}${truecolor}  ${reset} "
    fi
  done
    echo -e "$line $colors" 
done

I like this script.

My editor complained though:

 ❯ shellcheck colorcat.bash

In colorcat.bash line 16:
  local colors=""
  ^---^ SC2168 (error): 'local' is only valid in functions.


In colorcat.bash line 20:
      local r=$((16#${hex:0:2}))
      ^---^ SC2168 (error): 'local' is only valid in functions.


In colorcat.bash line 21:
      local g=$((16#${hex:2:2}))
      ^---^ SC2168 (error): 'local' is only valid in functions.


In colorcat.bash line 22:
      local b=$((16#${hex:4:2}))
      ^---^ SC2168 (error): 'local' is only valid in functions.


In colorcat.bash line 23:
      local truecolor="\033[48;2;${r};${g};${b}m"
      ^---^ SC2168 (error): 'local' is only valid in functions.


In colorcat.bash line 24:
      local reset="\033[0m"
      ^---^ SC2168 (error): 'local' is only valid in functions.

For more information:
  https://www.shellcheck.net/wiki/SC2168 -- 'local' is only valid in functions. 

@marmalodak thanks, fixed

fish version , thank you for inspiration i just tried to rewrite it in fish

@hrdkmishra hey that looks amazing!