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+#!/usr/bin/env bash
+# vim: ft=bash ts=2 sw=2 sts=2
+#
+# agnoster's Theme - https://gist.github.com/3712874
+# A Powerline-inspired theme for BASH
+#
+# (Converted from ZSH theme by Kenny Root)
+# https://gist.github.com/kruton/8345450
+#
+# Updated & fixed by Erik Selberg erik@selberg.org 1/14/17
+# Tested on MacOSX, Ubuntu, Amazon Linux
+# Bash v3 and v4
+#
+# # README
+#
+# In order for this theme to render correctly, you will need a
+# [Powerline-patched font](https://gist.github.com/1595572).
+# I recommend: https://github.com/powerline/fonts.git
+# > git clone https://github.com/powerline/fonts.git fonts
+# > cd fonts
+# > install.sh
+
+# In addition, I recommend the
+# [Solarized theme](https://github.com/altercation/solarized/) and, if you're
+# using it on Mac OS X, [iTerm 2](http://www.iterm2.com/) over Terminal.app -
+# it has significantly better color fidelity.
+
+# Install:
+
+# I recommend the following:
+# $ cd home
+# $ mkdir -p .bash/themes/agnoster-bash
+# $ git clone https://github.com/speedenator/agnoster-bash.git .bash/themes/agnoster-bash
+
+# then add the following to your .bashrc:
+
+# export THEME=$HOME/.bash/themes/agnoster-bash/agnoster.bash
+# if [[ -f $THEME ]]; then
+#     export DEFAULT_USER=`whoami`
+#     source $THEME
+# fi
+
+#
+# # Goals
+#
+# The aim of this theme is to only show you *relevant* information. Like most
+# prompts, it will only show git information when in a git working directory.
+# However, it goes a step further: everything from the current user and
+# hostname to whether the last call exited with an error to whether background
+# jobs are running in this shell will all be displayed automatically when
+# appropriate.
+
+# Generally speaking, this script has limited support for right
+# prompts (ala powerlevel9k on zsh), but it's pretty problematic in Bash.
+# The general pattern is to write out the right prompt, hit \r, then
+# write the left. This is problematic for the following reasons:
+# - Doesn't properly resize dynamically when you resize the terminal
+# - Changes to the prompt (like clearing and re-typing, super common) deletes the prompt
+# - Getting the right alignment via columns / tput cols is pretty problematic (and is a bug in this version)
+# - Bash prompt escapes (like \h or \w) don't get interpolated
+#
+# all in all, if you really, really want right-side prompts without a
+# ton of work, recommend going to zsh for now. If you know how to fix this,
+# would appreciate it!
+
+# note: requires bash v4+... Mac users - you often have bash3.
+# 'brew install bash' will set you free
+PROMPT_DIRTRIM=2 # bash4 and above
+
+######################################################################
+DEBUG=0
+debug() {
+    if [[ ${DEBUG} -ne 0 ]]; then
+        >&2 echo -e $*
+    fi
+}
+
+######################################################################
+### Segment drawing
+# A few utility functions to make it easy and re-usable to draw segmented prompts
+
+CURRENT_BG='NONE'
+CURRENT_RBG='NONE'
+SEGMENT_SEPARATOR=''
+RIGHT_SEPARATOR=''
+LEFT_SUBSEG=''
+RIGHT_SUBSEG=''
+
+text_effect() {
+    case "$1" in
+        reset)      echo 0;;
+        bold)       echo 1;;
+        underline)  echo 4;;
+    esac
+}
+
+# to add colors, see
+# http://bitmote.com/index.php?post/2012/11/19/Using-ANSI-Color-Codes-to-Colorize-Your-Bash-Prompt-on-Linux
+# under the "256 (8-bit) Colors" section, and follow the example for orange below
+fg_color() {
+    case "$1" in
+        black)      echo 30;;
+        red)        echo 31;;
+        green)      echo 32;;
+        yellow)     echo 33;;
+        blue)       echo 34;;
+        magenta)    echo 35;;
+        cyan)       echo 36;;
+        white)      echo 37;;
+        orange)     echo 38\;5\;166;;
+    esac
+}
+
+bg_color() {
+    case "$1" in
+        black)      echo 40;;
+        red)        echo 41;;
+        green)      echo 42;;
+        yellow)     echo 43;;
+        blue)       echo 44;;
+        magenta)    echo 45;;
+        cyan)       echo 46;;
+        white)      echo 47;;
+        orange)     echo 48\;5\;166;;
+    esac;
+}
+
+# TIL: declare is global not local, so best use a different name
+# for codes (mycodes) as otherwise it'll clobber the original.
+# this changes from BASH v3 to BASH v4.
+ansi() {
+    local seq
+    declare -a mycodes=("${!1}")
+
+    debug "ansi: ${!1} all: $* aka ${mycodes[@]}"
+
+    seq=""
+    for ((i = 0; i < ${#mycodes[@]}; i++)); do
+        if [[ -n $seq ]]; then
+            seq="${seq};"
+        fi
+        seq="${seq}${mycodes[$i]}"
+    done
+    debug "ansi debug:" '\\[\\033['${seq}'m\\]'
+    echo -ne '\[\033['${seq}'m\]'
+    # PR="$PR\[\033[${seq}m\]"
+}
+
+ansi_single() {
+    echo -ne '\[\033['$1'm\]'
+}
+
+# Begin a segment
+# Takes two arguments, background and foreground. Both can be omitted,
+# rendering default background/foreground.
+prompt_segment() {
+    local bg fg
+    declare -a codes
+
+    debug "Prompting $1 $2 $3"
+
+    # if commented out from kruton's original... I'm not clear
+    # if it did anything, but it messed up things like
+    # prompt_status - Erik 1/14/17
+
+    #    if [[ -z $1 || ( -z $2 && $2 != default ) ]]; then
+    codes=("${codes[@]}" $(text_effect reset))
+    #    fi
+    if [[ -n $1 ]]; then
+        bg=$(bg_color $1)
+        codes=("${codes[@]}" $bg)
+        debug "Added $bg as background to codes"
+    fi
+    if [[ -n $2 ]]; then
+        fg=$(fg_color $2)
+        codes=("${codes[@]}" $fg)
+        debug "Added $fg as foreground to codes"
+    fi
+
+    debug "Codes: "
+    # declare -p codes
+
+    if [[ $CURRENT_BG != NONE && $1 != $CURRENT_BG ]]; then
+        declare -a intermediate=($(fg_color $CURRENT_BG) $(bg_color $1))
+        debug "pre prompt " $(ansi intermediate[@])
+        PR="$PR $(ansi intermediate[@])$SEGMENT_SEPARATOR"
+        debug "post prompt " $(ansi codes[@])
+        PR="$PR$(ansi codes[@]) "
+    else
+        debug "no current BG, codes is $codes[@]"
+        PR="$PR$(ansi codes[@]) "
+    fi
+    CURRENT_BG=$1
+    [[ -n $3 ]] && PR="$PR$3"
+}
+
+# End the prompt, closing any open segments
+prompt_end() {
+    if [[ -n $CURRENT_BG ]]; then
+        declare -a codes=($(text_effect reset) $(fg_color $CURRENT_BG))
+        PR="$PR $(ansi codes[@])$SEGMENT_SEPARATOR"
+    fi
+    declare -a reset=($(text_effect reset))
+    PR="$PR $(ansi reset[@])"
+    CURRENT_BG=''
+}
+
+### virtualenv prompt
+prompt_virtualenv() {
+    if [[ -n $VIRTUAL_ENV ]]; then
+        color=cyan
+        prompt_segment $color $PRIMARY_FG
+        prompt_segment $color white "$(basename $VIRTUAL_ENV)"
+    fi
+}
+
+
+### Prompt components
+# Each component will draw itself, and hide itself if no information needs to be shown
+
+# Context: user@hostname (who am I and where am I)
+prompt_context() {
+    local user=`whoami`
+
+    if [[ $user != $DEFAULT_USER || -n $SSH_CLIENT ]]; then
+        prompt_segment black default "$user@\h"
+    fi
+}
+
+# prints history followed by HH:MM, useful for remembering what
+# we did previously
+prompt_histdt() {
+    prompt_segment black default "\! [\A]"
+}
+
+
+git_status_dirty() {
+    dirty=$(git status -s 2> /dev/null | tail -n 1)
+    [[ -n $dirty ]] && echo " ●"
+}
+
+# Git: branch/detached head, dirty status
+prompt_git() {
+    local ref dirty
+    if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
+        ZSH_THEME_GIT_PROMPT_DIRTY='±'
+        dirty=$(git_status_dirty)
+        ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git show-ref --head -s --abbrev |head -n1 2> /dev/null)"
+        if [[ -n $dirty ]]; then
+            prompt_segment yellow black
+        else
+            prompt_segment green black
+        fi
+        PR="$PR${ref/refs\/heads\// }$dirty"
+    fi
+}
+
+# Dir: current working directory
+prompt_dir() {
+    prompt_segment blue black '\w'
+}
+
+# Status:
+# - was there an error
+# - am I root
+# - are there background jobs?
+prompt_status() {
+    local symbols
+    symbols=()
+    [[ $RETVAL -ne 0 ]] && symbols+="$(ansi_single $(fg_color red))✘"
+    [[ $UID -eq 0 ]] && symbols+="$(ansi_single $(fg_color yellow))⚡"
+    [[ $(jobs -l | wc -l) -gt 0 ]] && symbols+="$(ansi_single $(fg_color cyan))⚙"
+
+    [[ -n "$symbols" ]] && prompt_segment black default "$symbols"
+}
+
+######################################################################
+#
+# experimental right prompt stuff
+# requires setting prompt_foo to use PRIGHT vs PR
+# doesn't quite work per above
+
+rightprompt() {
+    printf "%*s" $COLUMNS "$PRIGHT"
+}
+
+# quick right prompt I grabbed to test things.
+__command_rprompt() {
+    local times= n=$COLUMNS tz
+    for tz in ZRH:Europe/Zurich PIT:US/Eastern \
+              MTV:US/Pacific TOK:Asia/Tokyo; do
+        [ $n -gt 40 ] || break
+        times="$times ${tz%%:*}\e[30;1m:\e[0;36;1m"
+        times="$times$(TZ=${tz#*:} date +%H:%M)\e[0m"
+        n=$(( $n - 10 ))
+    done
+    [ -z "$times" ] || printf "%${n}s$times\\r" ''
+}
+# PROMPT_COMMAND=__command_rprompt
+
+# this doens't wrap code in \[ \]
+ansi_r() {
+    local seq
+    declare -a mycodes2=("${!1}")
+
+    debug "ansi: ${!1} all: $* aka ${mycodes2[@]}"
+
+    seq=""
+    for ((i = 0; i < ${#mycodes2[@]}; i++)); do
+        if [[ -n $seq ]]; then
+            seq="${seq};"
+        fi
+        seq="${seq}${mycodes2[$i]}"
+    done
+    debug "ansi debug:" '\\[\\033['${seq}'m\\]'
+    echo -ne '\033['${seq}'m'
+    # PR="$PR\[\033[${seq}m\]"
+}
+
+# Begin a segment on the right
+# Takes two arguments, background and foreground. Both can be omitted,
+# rendering default background/foreground.
+prompt_right_segment() {
+    local bg fg
+    declare -a codes
+
+    debug "Prompt right"
+    debug "Prompting $1 $2 $3"
+
+    # if commented out from kruton's original... I'm not clear
+    # if it did anything, but it messed up things like
+    # prompt_status - Erik 1/14/17
+
+    #    if [[ -z $1 || ( -z $2 && $2 != default ) ]]; then
+    codes=("${codes[@]}" $(text_effect reset))
+    #    fi
+    if [[ -n $1 ]]; then
+        bg=$(bg_color $1)
+        codes=("${codes[@]}" $bg)
+        debug "Added $bg as background to codes"
+    fi
+    if [[ -n $2 ]]; then
+        fg=$(fg_color $2)
+        codes=("${codes[@]}" $fg)
+        debug "Added $fg as foreground to codes"
+    fi
+
+    debug "Right Codes: "
+    # declare -p codes
+
+    # right always has a separator
+    # if [[ $CURRENT_RBG != NONE && $1 != $CURRENT_RBG ]]; then
+    #     $CURRENT_RBG=
+    # fi
+    declare -a intermediate2=($(fg_color $1) $(bg_color $CURRENT_RBG) )
+    # PRIGHT="$PRIGHT---"
+    debug "pre prompt " $(ansi_r intermediate2[@])
+    PRIGHT="$PRIGHT$(ansi_r intermediate2[@])$RIGHT_SEPARATOR"
+    debug "post prompt " $(ansi_r codes[@])
+    PRIGHT="$PRIGHT$(ansi_r codes[@]) "
+    # else
+    #     debug "no current BG, codes is $codes[@]"
+    #     PRIGHT="$PRIGHT$(ansi codes[@]) "
+    # fi
+    CURRENT_RBG=$1
+    [[ -n $3 ]] && PRIGHT="$PRIGHT$3"
+}
+
+######################################################################
+## Emacs prompt --- for dir tracking
+# stick the following in your .emacs if you use this:
+
+# (setq dirtrack-list '(".*DIR *\\([^ ]*\\) DIR" 1 nil))
+# (defun dirtrack-filter-out-pwd-prompt (string)
+#   "dirtrack-mode doesn't remove the PWD match from the prompt.  This does."
+#   ;; TODO: support dirtrack-mode's multiline regexp.
+#   (if (and (stringp string) (string-match (first dirtrack-list) string))
+#       (replace-match "" t t string 0)
+#     string))
+# (add-hook 'shell-mode-hook
+#           #'(lambda ()
+#               (dirtrack-mode 1)
+#               (add-hook 'comint-preoutput-filter-functions
+#                         'dirtrack-filter-out-pwd-prompt t t)))
+
+prompt_emacsdir() {
+    # no color or other setting... this will be deleted per above
+    PR="DIR \w DIR$PR"
+}
+
+######################################################################
+## Main prompt
+
+build_prompt() {
+    [[ ! -z ${AG_EMACS_DIR+x} ]] && prompt_emacsdir
+    prompt_status
+    #[[ -z ${AG_NO_HIST+x} ]] && prompt_histdt
+    [[ -z ${AG_NO_CONTEXT+x} ]] && prompt_context
+    prompt_virtualenv
+    prompt_dir
+    prompt_git
+    prompt_end
+}
+
+# from orig...
+# export PS1='$(ansi_single $(text_effect reset)) $(build_prompt) '
+# this doesn't work... new model: create a prompt via a PR variable and
+# use that.
+
+set_bash_prompt() {
+    RETVAL=$?
+    PR=""
+    PRIGHT=""
+    CURRENT_BG=NONE
+    PR="$(ansi_single $(text_effect reset))"
+    build_prompt
+
+    # uncomment below to use right prompt
+    #     PS1='\[$(tput sc; printf "%*s" $COLUMNS "$PRIGHT"; tput rc)\]'$PR
+    PS1=$PR
+}
+
+PROMPT_COMMAND=set_bash_prompt