Bash prompt with git branch and condensed directory paths

default_leftonly.json

# Remove the comments
# The path is /usr/local/lib/python2.7/dist-packages/powerline/config_files/themes/shell/default_leftonly.json

{
        "segments": {
                "left": [                                                                       
                        {
                                "function": "powerline.segments.common.net.hostname",
                                "priority": 10
                        },
                        {
                                "function": "powerline.segments.common.env.user",
                                "priority": 30
                        },
                        {
                                "function": "powerline.segments.common.env.virtualenv",
                                "priority": 50
                        },
                        {
                                "function": "powerline.segments.common.vcs.branch",
                                "priority": 40
                        },
                        {
                                "function": "powerline.segments.shell.cwd",
                                "args"    : {
                                        "dir_shorten_len" : 2
                                },
                                "priority": 10
                        },
                        {
                                "function": "powerline.segments.shell.jobnum",
                                "priority": 20
                        },
                        {
                                "function": "powerline.segments.shell.last_status",
                                "priority": 10
                        }
                ]
        }
}