Mustache in POSIX shell.

There's (as of this writing) only one call to a non-builtin which is probably enough to claim this is fast enough for most uses.

mustache.sh requires GNU sed(1).

make && sudo make install

From the command-line:

FOO="foo" BAR="bar" mustache.sh <"tests/test.mustache"

As a library:

. "lib/mustache.sh"
FOO="foo" BAR="bar"
mustache <"tests/test.mustache"

• mustache(1)
• mustache(5)

• mustache.sh accepts input data via the environment, not via YAML frontmatter. This makes sense for shell programmers but may render this Mustache implementation unsuitable for other use.
• mustache.sh does not descend into a new scope within {{#tag}} or {{^tag}} sections. This again makes sense when being driven by environment variables.
• mustache.sh doesn't support the --compile or --tokens command-line options and does not accept input file(s) as arguments.
• mustache.sh doesn't care about escaping output as HTML.
• mustache.sh will execute tag names surrounded by backticks as shell commands.
• mustache.sh doesn't support list sections in the traditional sense: it requires the section tag be a shell command and processes the section once for each line on standard output with the line available in _M_LINE.

• Lambdas. What is this I don't even.
• Partials. This is related to supporting shell commands as variables.
• Set delimeter. This would be very hard to support in general because of the pervasive assumption that tag delimeters are two characters long.

• Variable tags.
• Section tags.
• Inverted section tags.
• Comment tags.
• Nested sections. Recursion, motherfucker. Do you speak it?
• List sections. The section tag must be a shell command. The section is processed once for each line on standard output with the line available in _M_LINE.

mustache.sh is BSD-licensed.