A Powerline like prompt for Bash using bash scripts

This implementation was inspired by Powerline-Shell. But that version, which is based on python, was exceedingly slow for my taste, taking upto 1.5 seconds for the shell prompt to be set with the python script. Hence, I decided to recreate the appearance created in that prompt using only shell scripts.

Consequently this is not nearly as readily configurable as python based one above. However, with a little bit of effort and knowledge of shell scripts, you can make this look however you desire.

• Shows time, hostname, current directory, and prompt
• Optional segments for number of background jobs, read-only status of current directory, return code for last command if exited in failure along with color change of the prompt to red
• Segment that shows current git branch if in a git repository, and number of modified, staged and conflicted files in the git repository.

• Number of background jobs: ⏎ followed by number
• Read-only status of current directory: 
• Return code from previous bash command: ⚑
• Git branch: 
• Number of modified files in git repo: ✚
• Number of staged files in git repo: ``
• Number of conflicted files in git repo: ✘

In addition, the following symbols are used to separate different segments: , 

• This shell script heavily relies on ANSI color codes to display colors in the terminal window. They may not be portable, hence it may not work for you out of the box. You may need to set your $TERM to xterm-256color.

• In addition, Unicode symbols require a special font to be used in your terminal. Please use one of the powerline fonts available at: https://github.com/Lokaltog/powerline-fonts

  • The "DejaVu Sans Mono for Powerline" font seems to be one of the better fonts for Unicode support.

• You may need to use uxterm, the XTerm with unicode support, in place of xterm if the Unicode characters are not correctly rendered.

• This script uses the __git_ps1 command to identify if a directory is a git repository, and if it is, identify the branch name. If you do not have this command, please install it for your system.

• Clone this repository, or copy the ps1_prompt shell script to a suitable location. Let us assume that you placed this in your home directory.

• In your .bashrc or .profile, whichever is used, source the ps1_prompt script as follows:

source ~/ps1_prompt

At this point, this script has no simple option for customization apart from manually editting the script to your liking. Once you get the flow of the script, and after familiarizing yourself with the ANSI color codes, it should be fairly straightforward to enhance the script to your taste.

Some resources that can help you with tweaking the script:

• Bash tips: Colors and formatting (ANSI/VT100 Control sequences)
• ANSI color codes: Color codes for the xterm/uxterm.
• UTF-8 Unicode test documents: Use the test documents in this repo to see what symbols are rendered using your chosen font.
• PS1 cheat sheet: Prompt variable characters for customizing the output of the PS1 prompt.

If you can contribute to make this script more customizable, please do so and submit a pull request!