Powerline Bash prompt

.bash_profile

# Add to ~/.bash_profile
function _update_ps1()
{
   export PS1="$(~/bin/powerline-bash.py $?)"
 }
export PROMPT_COMMAND="_update_ps1"

powerline-bash.py

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

import os
import subprocess
import sys
import re

class Powerline:
    symbols = {
        'compatible': {
            'separator': u'\u25B6',
            'separator_thin': u'\u276F'
        },
        'patched': {
            'separator': u'\u2B80',
            'separator_thin': u'\u2B81'
        }
    }
    LSQESCRSQ = '\\[\\e%s\\]'
    reset = LSQESCRSQ % '[0m'

    def __init__(self, mode='compatible'):
        self.separator = Powerline.symbols[mode]['separator']
        self.separator_thin = Powerline.symbols[mode]['separator_thin']
        self.segments = []

    def color(self, prefix, code):
        return self.LSQESCRSQ % ('[%s;5;%sm' % (prefix, code))

    def fgcolor(self, code):
        return self.color('38', code)

    def bgcolor(self, code):
        return self.color('48', code)

    def append(self, segment):
        self.segments.append(segment)

    def draw(self):
        return (''.join((s[0].draw(s[1]) for s in zip(self.segments, self.segments[1:]+[None])))
            + self.reset).encode('utf-8')

class Segment:
    def __init__(self, powerline, content, fg, bg, separator=None, separator_fg=None):
        self.powerline = powerline
        self.content = content
        self.fg = fg
        self.bg = bg
        self.separator = separator or powerline.separator
        self.separator_fg = separator_fg or bg

    def draw(self, next_segment=None):
        if next_segment:
            separator_bg = self.powerline.bgcolor(next_segment.bg)
        else:
            separator_bg = self.powerline.reset

        return ''.join((
            self.powerline.fgcolor(self.fg),
            self.powerline.bgcolor(self.bg),
            self.content,
            separator_bg,
            self.powerline.fgcolor(self.separator_fg),
            self.separator))

def add_cwd_segment(powerline, cwd, maxdepth):
    #powerline.append(' \\w ', 15, 237)
    home = os.getenv('HOME')
    cwd = os.getenv('PWD')

    if cwd.find(home) == 0:
        cwd = cwd.replace(home, '~', 1)

    if cwd[0] == '/':
        cwd = cwd[1:]

    names = cwd.split('/')
    if len(names) > maxdepth:
        names = names[:2] + [u'\u2026'] + names[2-maxdepth:]

    for n in names[:-1]:
        powerline.append(Segment(powerline, ' %s ' % n, 250, 237, powerline.separator_thin, 244))
    powerline.append(Segment(powerline, ' %s ' % names[-1], 254, 237))

def is_hg_clean():
    output = os.popen("hg status 2> /dev/null | grep '^?' | tail -n1").read()
    return len(output) == 0

def add_hg_segment(powerline, cwd):
    green = 148
    red = 161
    branch = os.popen('hg branch 2> /dev/null').read().rstrip()
    if len(branch) == 0:
        return False
    bg = red
    fg = 15
    if is_hg_clean():
        bg = green
        fg = 0
    powerline.append(Segment(powerline, ' %s ' % branch, fg, bg))
    return True

def get_git_status():
    has_pending_commits = True
    has_untracked_files = False
    origin_position = ""
    output = subprocess.Popen(['git', 'status'], stdout=subprocess.PIPE).communicate()[0]
    for line in output.split('\n'):
        origin_status = re.findall("Your branch is (ahead|behind).*?(\d+) comm", line)
        if len(origin_status) > 0:
            origin_position = " %d" % int(origin_status[0][1])
            if origin_status[0][0] == 'behind':
                origin_position += u'\u21E3'
            if origin_status[0][0] == 'ahead':
                origin_position += u'\u21E1'

        if line.find('nothing to commit (working directory clean)') >= 0:
            has_pending_commits = False
        if line.find('Untracked files') >= 0:
            has_untracked_files = True
    return has_pending_commits, has_untracked_files, origin_position

def add_git_segment(powerline, cwd):
    green = 148
    red = 161
    #cmd = "git branch 2> /dev/null | grep -e '\\*'"
    p1 = subprocess.Popen(['git', 'branch'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    p2 = subprocess.Popen(['grep', '-e', '\\*'], stdin=p1.stdout, stdout=subprocess.PIPE)
    output = p2.communicate()[0].strip()
    if len(output) == 0:
        return False
    branch = output.rstrip()[2:]
    has_pending_commits, has_untracked_files, origin_position = get_git_status()
    branch += origin_position
    if has_untracked_files:
        branch += ' +'
    bg = green
    fg = 0
    if has_pending_commits:
        bg = red
        fg = 15
    powerline.append(Segment(powerline, ' %s ' % branch, fg, bg))
    return True

def add_svn_segment(powerline, cwd):
    if not os.path.exists(os.path.join(cwd,'.svn')):
        return
    '''svn info:
        First column: Says if item was added, deleted, or otherwise changed
        ' ' no modifications
        'A' Added
        'C' Conflicted
        'D' Deleted
        'I' Ignored
        'M' Modified
        'R' Replaced
        'X' an unversioned directory created by an externals definition
        '?' item is not under version control
        '!' item is missing (removed by non-svn command) or incomplete
         '~' versioned item obstructed by some item of a different kind
    '''
    #TODO: Color segment based on above status codes
    try:
        #cmd = '"svn status | grep -c "^[ACDIMRX\\!\\~]"'
        p1 = subprocess.Popen(['svn', 'status'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        p2 = subprocess.Popen(['grep', '-c', '^[ACDIMRX\\!\\~]'], stdin=p1.stdout, stdout=subprocess.PIPE)
        output = p2.communicate()[0].strip()
        if len(output) > 0 and int(output) > 0:
            changes = output.strip()
            powerline.append(Segment(powerline, ' %s ' % changes, 22, 148))
    except OSError:
        return False
    except subprocess.CalledProcessError:
        return False
    return True

def add_repo_segment(powerline, cwd):
    for add_repo_segment in [add_git_segment, add_svn_segment, add_hg_segment]:
        try:
            if add_repo_segment(p, cwd): return
        except subprocess.CalledProcessError:
            pass
        except OSError:
            pass

def add_virtual_env_segment(powerline, cwd):
    env = os.getenv("VIRTUAL_ENV")
    if env == None:
        return False
    env_name = os.path.basename(env)
    bg = 35
    fg = 22
    powerline.append(Segment(powerline,' %s ' % env_name, fg, bg))
    return True


def add_root_indicator(powerline, error):
    bg = 236
    fg = 15
    if int(error) != 0:
        fg = 15
        bg = 161
    powerline.append(Segment(powerline, ' \\$ ', fg, bg))

if __name__ == '__main__':
    p = Powerline(mode='patched')
    cwd = os.getcwd()
    add_virtual_env_segment(p, cwd)
    #p.append(Segment(powerline, ' \\u ', 250, 240))
    #p.append(Segment(powerline, ' \\h ', 250, 238))
    add_cwd_segment(p, cwd, 5)
    add_repo_segment(p, cwd)
    add_root_indicator(p, sys.argv[1] if len(sys.argv) > 1 else 0)
    sys.stdout.write(p.draw())

# vim: set expandtab: