3

Various minifier scripts exist for shell code, (e.g. bash-minifier), but how about the reverse?

  1. Are there any shell-centric utils or scripts to automatically turn a one-liner like this:

    echo foo;echo bar;echo "baz;bing";echo 'buz;bong'

    ...into this:

    echo foo
echo bar
echo "baz;bing"
echo 'buz;bong'

  2. Or turn minimalist logic like this:

    true && echo foo

    ...into this:

    if true ; then
    echo foo
fi
agc
  • 7,045
  • 3
  • 23
  • 53

1 Answers1

2

Minification is not generally a reversible operation, as information could be lost in the process, e.g. consider human-readable variable names, comments, logical constructs, which can be written in multitude of different ways e.t.c.

But there are various tools, which can pretty-print or beautify your code, which should solve #1 for you.

One example is: https://github.com/mvdan/sh

A shell parser, formatter and interpreter (POSIX/Bash/mksh)

Running your one-liner, through it, produces the following result:

%shfmt <<<"echo foo;echo bar;echo \"baz;bing\";echo 'buz;bong'"

echo foo
echo bar
echo "baz;bing"
echo 'buz;bong'
zeppelin
  • 3,782
  • 10
  • 21
  • Progress... but `shfmt` doesn't seem to unroll a `for` loop: `shfmt <<< "for f in foo bar; do echo $f ; done"` returns `for f in foo bar; do echo bar; done` where the semicolons aren't changed into carriage returns. – agc Jun 09 '17 at 22:28
  • 1
    @agc It does re-format the loops in fact, but only if they have > 1 statements in the body block, e.g. `shfmt -s <<< "for f in foo bar; do echo $f; echo $f ; done"` – zeppelin Jun 10 '17 at 11:47