Run CMD - an easy shell command builder and runner

Installation

npm install run-cmd

Usage

var cmd = require('run-cmd');

// specify the command ls [-a] [-l] [path ...]
var lsCmd = cmd.build('ls')
  .flag('all', '-a') // creates a function all(), which will generate -a when called.
  .flag('list', '-l') // crates a function list(), which will generate -l when called.
  .default('path'); // allows you to call path('path_to_file')

// use the command and spawn a child process.

var lsProc = lsCmd
  .all()
  .list()
  .path('.')
  .spawn();

// another way is via make by passing in arguments as an option object... the flags are true/false
var lsProc2 = lsCmd
  .make({
    all: true
    , list: true
    , path: [ '.' ]
  }).spawn();
  
// one can also use exec instead of spawn...

lsCmd.all().list().path('.').exec(function (err, stdout, stderr) {
    ....
});

We can also build from an object structure without first creating the definition of the command itself - this is a single-use approach.

var cmd = require('run-cmd);
cmd.object('ls', {a: true, l: true, _: [ '.', '..' ]}).exec(function(err, stdout, stderr) {
  ...
});

In such case, use _ as the rest argument - passing an array for them.

You can also use a third option parameter to control the following:

• flagStyle - defaults to -- for flags that are more than one character, and - for a single character flag. The way it does is to take the first character from flagStyle for the single character flag.
• binaryFlag - defaults to true, which will not append the value if it's true or false. i.e. {a: true} will transformed into -a
• skip - an array of flags to be skipped for inclusion into the command parameter. By default _ is included because it's parsed as the rest parameter.