Remove dependency on make about just HOT 5 CLOSED

# single line comments are allowed
# for now, the '#' must be the first non-whitespace character on a line

# simple recipes work as before:
foo:
  cd baz
  touch bar
  echo galf

# tabs and spaces can be mixed, but there must be an equal
# number of tabs and spaces (in whatever order) before
# every line in a recipe, so that a user's tab-width setting
# doesn't matter
#
# using . for space and - for tab:

# this is okay, every line starts with one space:
a:
.echo hello
.echo hello

# this is okay, every line starts with the same whitespace:
b:
.-echo hello
.-echo hello

# this is not okay, inconsistent whitespace:
c:
.-echo hello
--echo hello

# this is okay, because it is still unambiguous:
d:
.-echo hello
-.echo hello
# (we could disallow this)

# recipes may call other recipes
bar: foo a b
  echo "I'm bar!"

# as in make, a leading @ suppresses printing the command
qux:
  @echo "Pinging the server..."
  @ping 237.1.4.5

stuff:
  #!/usr/bin/env python3
  def foo(a, b):
    print(a + b):
  for i in range(100):
    foo(i + i * i)

stuff:
  #!/bin/sh
  # variables will work as expected:
  A=hello
  echo getting $A...
  # the next line can fail and we'll still continue:
  curl http://example.com/$A > hello.html
  echo "We tried!"