A theme for https://github.com/magicmonty/bash-git-prompt, based on Single_line_Ubuntu, but with some spacing adjustment and with the Git path colorized and the branch name injected at the base of it rather than the end.

Single_line_BadIdea.bgptheme

override_git_prompt_colors() {
  gp_pwd() {
    local git_top="$(git rev-parse --show-toplevel 2> /dev/null)"
    case "$1" in
      out) local out="${git_top:+$(dirname $git_top)/}"; out="${out:-$PWD}"; printf '%s' "${out/#$HOME/~}" ;;
      in) printf '%s' "${git_top:+${PWD#$git_top}}" ;;
      *) printf '%s' "${git_top:+$(basename $git_top)}" ;;
    esac
  }
  # Based mostly on Single_line_Ubuntu, but with some excess space removed
  GIT_PROMPT_THEME_NAME="Single_line_BadIdea"
  GIT_PROMPT_LEADING_SPACE=0
  GIT_PROMPT_PREFIX="["
  GIT_PROMPT_SUFFIX="]"
  GIT_PROMPT_SEPARATOR=""
  GIT_PROMPT_STAGED=" ${Red}●${ResetColor}"
  GIT_PROMPT_CONFLICTS=" ${Red}✖${ResetColor}"
  GIT_PROMPT_CHANGED=" ${Blue}✚${ResetColor}"
  GIT_PROMPT_REMOTE=" "
  GIT_PROMPT_UNTRACKED=" ${Cyan}…${ResetColor}"
  GIT_PROMPT_STASHED=" ${BoldBlue}⚑${ResetColor}"
  GIT_PROMPT_CLEAN=" ${BoldGreen}✔${ResetColor}"
  GIT_PROMPT_COMMAND_OK="${Green}✔"
  GIT_PROMPT_COMMAND_FAIL="${Red}✘ (_LAST_COMMAND_STATE_)"
  GIT_PROMPT_START_USER="_LAST_COMMAND_INDICATOR_ ${White}${Time12a}${ResetColor} ${Cyan}\$(gp_pwd out)${Yellow}\$(gp_pwd)${ResetColor}"
  local gp_end="${Yellow}\$(gp_pwd in)${ResetColor}"
  GIT_PROMPT_END_USER="${gp_end}${ResetColor} $ "
  GIT_PROMPT_END_ROOT="${gp_end}${BoldRed} # "
  GIT_PROMPT_SYMBOLS_AHEAD=" ↑";
  GIT_PROMPT_SYMBOLS_BEHIND=" ↓";
}

reload_git_prompt_colors "Single_line_BadIdea"