# vim:ft=zsh ts=2 sw=2 sts=2
#
# agnoster's Theme - https://gist.github.com/3712874
# A Powerline-inspired theme for ZSH
#
# # README
#
# In order for this theme to render correctly, you will need a
# [Powerline-patched font](https://github.com/Lokaltog/powerline-fonts).
# Make sure you have a recent version: the code points that Powerline
# uses changed in 2012, and older versions will display incorrectly,
# in confusing ways.
#
# In addition, I recommend the
# [Solarized theme](https://github.com/altercation/solarized/) and, if you're
# using it on Mac OS X, [iTerm 2](https://iterm2.com/) over Terminal.app -
# it has significantly better color fidelity.
#
# If using with "light" variant of the Solarized color schema, set
# SOLARIZED_THEME variable to "light". If you don't specify, we'll assume
# you're using the "dark" variant.
#
# # 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.

### Segment drawing
# A few utility functions to make it easy and re-usable to draw segmented prompts

CURRENT_BG='NONE'

case ${SOLARIZED_THEME:-dark} in
    light) CURRENT_FG='white';;
    *)     CURRENT_FG='black';;
esac

# Special Powerline characters

() {
    local LC_ALL="en_US.utf8" LC_CTYPE="en_US.utf8"
    # NOTE: This segment separator character is correct.  In 2012, Powerline changed
    # the code points they use for their special characters. This is the new code point.
    # If this is not working for you, you probably have an old version of the
    # Powerline-patched fonts installed. Download and install the new version.
    # Do not submit PRs to change this unless you have reviewed the Powerline code point
    # history and have new information.
    # This is defined using a Unicode escape sequence so it is unambiguously readable, regardless of
    # what font the user is viewing this source code in. Do not replace the
    # escape sequence with a single literal character.
    # Do not change this! Do not make it '\u2b80'; that is the old, wrong code point.
    SEGMENT_SEPARATOR=$'\ue0b0'
}

# Begin a segment
# Takes two arguments, background and foreground. Both can be omitted,
# rendering default background/foreground.
prompt_segment() {
    local bg fg
    [[ -n $1 ]] && bg="%K{$1}" || bg="%k"
    [[ -n $2 ]] && fg="%F{$2}" || fg="%f"
    if [[ $CURRENT_BG != 'NONE' && $1 != $CURRENT_BG ]]; then
        echo -n "%{$bg%F{$CURRENT_BG}%}$SEGMENT_SEPARATOR%{$fg%}"
    else
        echo -n "%{$bg%}%{$fg%}"
    fi
    CURRENT_BG=$1
    [[ -n $3 ]] && echo -n $3
}

# End the prompt, closing any open segments
prompt_end() {
    if [[ -n $CURRENT_BG ]]; then
        echo -n "%{%k%F{$CURRENT_BG}%}"
    else
        echo -n "%{%k%}"
    fi
    echo -n "%{%f%}"
    CURRENT_BG=''
}

prompt_context() {
    prompt_segment

    #printf to kill the mystery space...?
    echo -n "%B%{$fg[red]%}[%{$fg[yellow]%}%n%{$fg[green]%}@%{$fg[blue]%}%M %{$fg[magenta]%}%~%{$fg[red]%}]%{$reset_color%}%b"
}

# Git: branch/detached head, dirty status
prompt_git() {
    (( $+commands[git] )) || return
    if [[ "$(git config --get oh-my-zsh.hide-status 2>/dev/null)" = 1 ]]; then
        return
    fi
    local PL_BRANCH_CHAR
    () {
        local LC_ALL="en_US.utf8" LC_CTYPE="en_US.utf8"
        PL_BRANCH_CHAR=$'\ue0a0'         # 
    }
    local ref dirty mode repo_path

    if [[ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = "true" ]]; then
        repo_path=$(git rev-parse --git-dir 2>/dev/null)
        dirty=$(parse_git_dirty)
        ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git rev-parse --short HEAD 2> /dev/null)"
        if [[ -n $dirty ]]; then
            prompt_segment yellow black
        else
            prompt_segment green $CURRENT_FG
        fi

        if [[ -e "${repo_path}/BISECT_LOG" ]]; then
            mode="<B>"
        elif [[ -e "${repo_path}/MERGE_HEAD" ]]; then
            mode=">M<"
        elif [[ -e "${repo_path}/rebase" || -e "${repo_path}/rebase-apply" || -e "${repo_path}/rebase-merge" || -e "${repo_path}/../.dotest" ]]; then
            mode=">R>"
        fi

        remote="$(git ls-remote --get-url 2>/dev/null)"

        setopt promptsubst
        autoload -Uz vcs_info

        zstyle ':vcs_info:*' enable git
        zstyle ':vcs_info:*' get-revision true
        zstyle ':vcs_info:*' check-for-changes true
        zstyle ':vcs_info:*' stagedstr '✚'
        zstyle ':vcs_info:*' unstagedstr '±'
        zstyle ':vcs_info:*' formats ' %u%c'
        zstyle ':vcs_info:*' actionformats ' %u%c'
        vcs_info
        echo -n " $remote ${ref/refs\/heads\//$PL_BRANCH_CHAR }${vcs_info_msg_0_%% }${mode}"
        prompt_segment
        echo
    fi
}

# Virtualenv: current working virtualenv
prompt_virtualenv() {
    local virtualenv_path="$VIRTUAL_ENV"
    if [[ -n $virtualenv_path && -n $VIRTUAL_ENV_DISABLE_PROMPT ]]; then
        prompt_segment blue black "(`basename $virtualenv_path`)"
    fi
}

# Status:
# - was there an error
# - am I root
# - are there background jobs?
prompt_status() {
    local -a symbols

    [[ $RETVAL -ne 0 ]] && symbols+="%{%F{red}%}✘"
    [[ $(jobs -l | wc -l) -gt 0 ]] && symbols+="%{%F{cyan}%}⚙"

    [[ -n "$symbols" ]] && prompt_segment black default "$symbols"
}

## Main prompt
build_prompt() {
    RETVAL=$?
    prompt_status
    prompt_virtualenv
    prompt_git
    prompt_context
    prompt_end
}

if [[ $UID -eq 0 ]]; then
    prompt_char="Σ"
else
    prompt_char="λ"
fi

PROMPT='$(build_prompt)$prompt_char '