refactor themes to support standardized clock functions

themes/tonka/tonka.theme.bash

@@ -1,3 +1,22 @@
+#!/usr/bin/env bash
+
+__tonka_time() {
+  THEME_CLOCK_FORMAT="%H%M"
+  clock_prompt
+}
+
+__tonka_date() {
+  THEME_CLOCK_FORMAT="%a,%d %b %y"
+  clock_prompt
+}
+
+__tonka_clock() {
+  local LIGHT_BLUE="\[\033[1;34m\]"
+  if [[ "${THEME_SHOW_CLOCK}" = "true" ]]; then
+    echo "$(__tonka_time)${LIGHT_BLUE}:$(__tonka_date)${LIGHT_BLUE}:"
+  fi
+}
+
 prompt_setter() {
 
 #   Named "Tonka" because of the colour scheme
@@ -23,8 +42,8 @@ $YELLOW\$PWD\
 $LIGHT_BLUE)-$YELLOW-\
 \n\
 $YELLOW-$LIGHT_BLUE-(\
-$YELLOW\$(date +%H%M)$LIGHT_BLUE:$YELLOW\$(date \"+%a,%d %b %y\")\
-$LIGHT_BLUE:$WHITE\\$ $LIGHT_BLUE)-$YELLOW-$NO_COLOUR "
+$(__tonka_clock)\
+$WHITE\$ $LIGHT_BLUE)-$YELLOW-$NO_COLOUR "
 
 PS2="$LIGHT_BLUE-$YELLOW-$YELLOW-$NO_COLOUR "
 
@@ -32,6 +51,9 @@ PS2="$LIGHT_BLUE-$YELLOW-$YELLOW-$NO_COLOUR "
 
 safe_append_prompt_command prompt_setter
 
+THEME_SHOW_CLOCK=${THEME_SHOW_CLOCK:-"true"}
+THEME_CLOCK_COLOR=${THEME_CLOCK_COLOR:-"\[\033[1;33m\]"}
+
 export PS3=">> "
 
 LS_COLORS='no=00:fi=00:di=00;33:ln=01;36:pi=40;34:so=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.deb=01;31:*.jpg=01;35:*.gif=01;35:*.bmp=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.mpg=01;37:*.avi=01;37:*.gl=01;37:*.dl=01;37:';