cherry_prompt.sh

# Palette: http://colorpalettes.net/color-palette-3697/
# Brown:       #4f231c rgb(79,35,28)
# Dark red:    #88011d rgb(136,1,29)
# Light red:   #da002b rgb(218,0,43)
# Blueish:     #8ed2df rgb(142,210,223)
# Kinda white: #f2efdf rgb(242,239,223)

# Alternative pallete: http://colorpalettes.net/tag/the-color-of-cherry/
# Green 1: #7e9b0d rgb(126,155,13)
# Green 2: #baaf07 rgb(186,175,7)

rgb() {
	# $1: BG=0, FG=1
	if [ "$1" -eq "0" ]; then
		echo "\033[48;2;${2};${3};${4}m"
	else
		echo "\033[38;2;${2};${3};${4}m"
	fi
}

frgb() {
	# FG then BG.
	echo "\033[38;2;${1};${2};${3};48;2;${4};${5};${6}m"
}

FALLBACK_PS1="$PS1"

cherry_prompt() {
  # Run `man strftime` to see how to specify the date-time format.

  local EXIT_CODE="$?"
  local BOLD="\033[1m"
  local RESET="\033[0m"

  ## One line.
  # CHERRY_PS1=""
  # CHERRY_PS1+="\[$(frgb 242 239 223 136 1 29)\]$(date '+%-m月%-d日')"
  # CHERRY_PS1+="\[$(frgb 242 239 223 218 0 43)\]$(date '+%-H時%-M分')"
  # CHERRY_PS1+="\[$(rgb 0 242 239 223)$(rgb 1 79 35 28)\] \u \[$(rgb 1 218 0 43)\]at \[$(rgb 1 79 35 28)\]\H \[$(rgb 1 218 0 43)\]in \[$(rgb 1 79 35 28)\]\W \[$(rgb 1 218 0 43)$BOLD\]\$\[$RESET\] "
  # # CHERRY_PS1+="\[$(rgb 0 242 239 223)$(rgb 1 79 35 28)\] \u\[$(rgb 1 218 0 43)\]@\[$(rgb 1 79 35 28)\]\H\[$(rgb 1 218 0 43)\]:\[$(rgb 1 79 35 28)\]\W \[$(rgb 1 218 0 43)$BOLD\]\$\[$RESET\] "

  ## Multiline.
  # CHERRY_PS1="\n"
  # CHERRY_PS1+="\[$(frgb 242 239 223 136 1 29)\]$(date '+%Y年%-m月%-d日')"
  # CHERRY_PS1+="\[$(frgb 242 239 223 218 0 43)\]$(date '+%-H時%-M分')\[$RESET\]\n"
  # CHERRY_PS1+="\[$(rgb 0 242 239 223)$(rgb 1 79 35 28)\]\u \[$(rgb 1 218 0 43)\]at \[$(rgb 1 79 35 28)\]\H \[$(rgb 1 218 0 43)\]in \[$(rgb 1 79 35 28)\]\W "
  # if [ -n "$VIRTUAL_ENV" ]; then
  #   ENV_NAME=$(basename $VIRTUAL_ENV)
  #   CHERRY_PS1+="\[$(rgb 1 126 155 13)\]($ENV_NAME) "
  # fi
  # if [ "$EXIT_CODE" != 0 ]; then
  #   CHERRY_PS1+="\[$(rgb 1 126 155 13)\](error $EXIT_CODE) "
  # fi
  # CHERRY_PS1+="\[$(rgb 1 218 0 43)$BOLD\]\$\[$RESET\] "

  ## Full width.
  DARK_RED="\[$(frgb 242 239 223 136 1 29)\]"
  LIGHT_RED="\[$(frgb 242 239 223 218 0 43)\]"
  JTIME=$(date '+%Y_%-m_%-d_%-H_%-M' | perl -Mutf8 -CS -pe 'tr/0123456789/０１２３４５６７８９/')
  YEAR=$(echo $JTIME | cut -d_ -f1)
  MONTH=$(echo $JTIME | cut -d_ -f2)
  DAY=$(echo $JTIME | cut -d_ -f3)
  HOUR=$(echo $JTIME | cut -d_ -f4)
  MINUTE=$(echo $JTIME | cut -d_ -f5)
  CHERRY_PS1="\n"
  CHERRY_PS1+="$DARK_RED${YEAR}年${MONTH}月${DAY}日"
  CHERRY_PS1+="$LIGHT_RED${HOUR}時${MINUTE}分\[$RESET\]\n"
  CHERRY_PS1+="\[$(rgb 0 242 239 223)$(rgb 1 79 35 28)\]\u \[$(rgb 1 218 0 43)\]at \[$(rgb 1 79 35 28)\]\H \[$(rgb 1 218 0 43)\]in \[$(rgb 1 79 35 28)\]\W "
  if [ -n "$VIRTUAL_ENV" ]; then
    ENV_NAME=$(basename $VIRTUAL_ENV)
    CHERRY_PS1+="\[$(rgb 1 126 155 13)\]($ENV_NAME) "
  fi
  if [ "$EXIT_CODE" != 0 ]; then
    CHERRY_PS1+="\[$(rgb 1 126 155 13)\](error $EXIT_CODE) "
  fi
  CHERRY_PS1+="\[$(rgb 1 218 0 43)$BOLD\]\$\[$RESET\] "

  # Some terminals don't support true colors, e.g. if you enter `screen` the prompt
  # will look all weird. And I still don't know how to check for support for true
  # color, so meanwhile I did this.
  if [ "$TERM" == "xterm-256color" ]; then
    PS1="$CHERRY_PS1"
  else
    ## Fallback prompt
    PS1="$FALLBACK_PS1"
  fi
}

export PROMPT_COMMAND=cherry_prompt

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