extsprintf

extended POSIX-style sprintf

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extsprintf
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extsprintf: extended POSIX-style sprintf
Stripped down version of snprintf(3c). We make a best effort to throw an exception when given a format string we don't understand, rather than ignoring it, so that we won't break existing programs if/when we go implement the rest of this.
This implementation currently supports specifying
  • field alignment ('-' flag),
  • zero-pad ('0' flag)
  • always show numeric sign ('+' flag),
  • field width
  • conversions for strings, decimal integers, and floats (numbers).
  • argument size specifiers. These are all accepted but ignored, since
Javascript has no notion of the physical size of an argument.
Everything else is currently unsupported, most notably: precision, unsigned numbers, non-decimal numbers, and characters.
Besides the usual POSIX conversions, this implementation supports:
  • %j: pretty-print a JSON object (using node's "inspect")
  • %r: pretty-print an Error object
Example
First, install it:
# npm install extsprintf
Now, use it:
var mod_extsprintf = require('extsprintf');
console.log(mod_extsprintf.sprintf('hello %25s', 'world'));
outputs:
hello                     world
Also supported
printf: same args as sprintf, but prints the result to stdout
fprintf: same args as sprintf, preceded by a Node stream. Prints the result to the given stream.