Gist prompt

gistfile.txt

BLACK="\[\033[0;30m\]"
BLUE="\[\033[0;34m\]"
BROWN="\[\033[0;33m\]"
CYAN="\[\033[0;36m\]"
GREEN="\[\033[0;32m\]"
GRAY="\[\033[0;37m\]"
LIGHT_GREEN="\[\033[1;32m\]"
LIGHT_GRAY="\[\033[1;37m\]"
LIGHT_RED="\[\033[1;31m\]"
PURPLE="\[\033[0;35m\]"
RED="\[\033[0;31m\]"
WHITE="\[\033[1;37m\]"
YELLOW="\[\033[1;33m\]"
COLOR_NONE="\[\e[0m\]"

# Detect whether the current directory is a git repository.
function is_git_repository {
  git branch > /dev/null 2>&1
}

# Determine the branch/state information for this git repository.
function set_git_branch {
  # Capture the output of the "git status" command.
  git_status="$(git status 2> /dev/null)"

  # Set color based on clean/staged/dirty.
  if [[ ${git_status} =~ "working directory clean" ]]; then
    state="${GREEN}"
  elif [[ ${git_status} =~ "Changes to be committed" ]]; then
    state="${BROWN}"
  else
    state="${LIGHT_RED}"
  fi

  # Set arrow icon based on status against remote.
  remote_pattern="# Your branch is (.*) of"
  if [[ ${git_status} =~ ${remote_pattern} ]]; then
    if [[ ${BASH_REMATCH[1]} == "ahead" ]]; then
      remote="↑"
    else
      remote="↓"
    fi
  else
    remote=""
  fi
  diverge_pattern="# Your branch and (.*) have diverged"
  if [[ ${git_status} =~ ${diverge_pattern} ]]; then
    remote="↕"
  fi

  # Get the name of the branch.
  #branch_pattern="^# On branch ([^${IFS}]*)"
  #if [[ ${git_status} =~ ${branch_pattern} ]]; then
  #  branch=${BASH_REMATCH[1]}
  #fi

  branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
  }

  # Set the final branch string.
  BRANCH="${state}$(branch)${remote}${COLOR_NONE} "
}

# Return the prompt symbol to use, colorized based on the return value of the
# previous command.
function set_prompt_symbol () {
  if test $1 -eq 0 ; then
    PROMPT_SYMBOL="\$"
  else
    PROMPT_SYMBOL="${LIGHT_RED}\$${COLOR_NONE}"
  fi
}

# Determine active Python virtualenv details.
function set_virtualenv () {
  if test -z "$VIRTUAL_ENV" ; then
    PYTHON_VIRTUALENV=""
  else
    PYTHON_VIRTUALENV="${BLUE}[`basename \"$VIRTUAL_ENV\"`]${COLOR_NONE} "
  fi
}

# Set the full bash prompt.
function set_bash_prompt {
  # Set the PROMPT_SYMBOL variable. We do this first so we don't lose the
  # return value of the last command.
  set_prompt_symbol $?

  # Set the PYTHON_VIRTUALENV variable.
  set_virtualenv

  # Set the BRANCH variable.
  if is_git_repository ; then
    set_git_branch
  else
    BRANCH=''
  fi

  # Set the bash prompt variable.
  PS1="${PYTHON_VIRTUALENV}${GREEN}\u@\h ${CYAN}\w${COLOR_NONE} ${BRANCH}${PROMPT_SYMBOL} "
}

# Tell bash to execute this function just before displaying its prompt.
export PS1=set_bash_prompt
export PROMPT_COMMAND="$PS1"'; echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD/$HOME/~}\007"'