bash2bb

Translates bash scripts into babashka scripts.

% cat myscript.bash
#!/bin/bash
OF=myhome_directory_$(date +%Y%m%d).tar.gz
tar -czf $OF /home/linuxconfig 

% bash2bb myscript.bash
(require (quote [babashka.process :refer [shell pipeline pb]]))
(def OF (System/getenv "OF"))
(def OF (str "myhome_directory_" (:out (shell {:out :string} "date" "+%Y%m%d")) ".tar.gz"))
(shell "tar" "-czf" OF "/home/linuxconfig")

About

bash2bb generates a babashka program that's roughly equivalent to an input bash script. This can help in a few ways:

• Learning: If you already know how to perform a certain task in bash, you may wanto to learn how to do the same thing in babashka. With bash2bb, you can translate your bash knowledge into (the beginning of) a babashka program.

• Upgrading: When you run up against limitations with bash as a scripting language, you may want to convert an existing bash script to babashka. bash2bb gives you a rough translation of the code.

Note While bash2bb makes an effort to emulate various bash features, the result is likely to contain inaccuracies. Don't blindly trust the output – always review the generated script!

This is an early alpha release. Many bash language constructs aren't implemented yet.

See CHANGELOG.md for the release history.

Installation

bash2bb depends on the shfmt command-line tool. On macOS this dependency can be installed via homebrew:

brew install shfmt

You will also need to install bbin:

brew install babashka/brew/bbin

and

echo 'export PATH="$PATH:$HOME/.babashka/bbin/bin"' >> ~/.$(basename $SHELL)rc && exec $SHELL

With that out of the way, you can now use bbin to install bash2bb:

bbin install io.github.pesterhazy/bash2bb

Usage

Pass the script you'd like to translate as an argument:

bash2bb myscript.bash

If no argument is specified, bash2bb reads from stdin.

Implementation status

• [x] Redirection
• [x] Command substitution
• [x] If statements
• [x] Quoting rules
• [ ] Arrays, in particular $@
• [ ] Functions
• [ ] for loops
• [ ] while loops