Bash Contexter

The Bash Contexter will let you do things depending on where you run them. It takes advantage of command_not_found_handle in Bash 4.4. With it you can do things like below.

Example (Docker)

$> docker run -it ubuntu bash
root@7a14657624bf:/#
$> 7a1
root@7a14657624bf:/#

Example (Django)

$> ls
db.sqlite3  manage.py  myproj
$> makemigrations
Detected django project.
No changes detected

Installation

Simply run

wget -O - https://raw.githubusercontent.com/Pithikos/bash-contexter/master/install | bash

The installion script will clone everything under ~/.bash_contexter and a source entry will be appended to your ~/.bashrc.

You will need to manually source any of the examples you want. For example your ~/.bashrc can look like this if you use Docker and Django

source ~/.bash_contexter/bash_contexter.sh
source ~/.bash_contexter/examples/django.sh
source ~/.bash_contexter/examples/docker.sh

Usage

The fastest way is to source directly one of the existing examples.

You can however create custom contexters that suit your needs. See example below

function custom_command_not_found {
  echo "Could not find command '$@'"
}

function precheck_custom_command_not_found {
  return 0
}

bash_contexter_register 'custom_command_not_found'

The precheck_ function is a prerequisite for every contexter. Its only job is to determine if the context function should run or not - and for that it has to return 0 or 1.

Uninstall

rm -fr ~/.bash_contexter

You also need to manually remove the source line in your ~/.bashrc

Helpers

You can use these helper scripts in your prechecks

_upfind_dir - find a specific directory from current path up to the root _upfind_file - find a specific file from current path up to the root