ce4c83ff
 wxy
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var format = require('util').format;
var common = require('./common');
common.register('echo', _echo, {
allowGlobbing: false,
});
//@
//@ ### echo([options,] string [, string ...])
//@
//@ Available options:
//@
//@ + `-e`: interpret backslash escapes (default)
//@ + `-n`: remove trailing newline from output
//@
//@ Examples:
//@
//@ ```javascript
//@ echo('hello world');
//@ var str = echo('hello world');
//@ echo('-n', 'no newline at end');
//@ ```
//@
//@ Prints `string` to stdout, and returns string with additional utility methods
//@ like `.to()`.
function _echo(opts) {
// allow strings starting with '-', see issue #20
var messages = [].slice.call(arguments, opts ? 0 : 1);
var options = {};
// If the first argument starts with '-', parse it as options string.
// If parseOptions throws, it wasn't an options string.
try {
options = common.parseOptions(messages[0], {
'e': 'escapes',
'n': 'no_newline',
}, {
silent: true,
});
// Allow null to be echoed
if (messages[0]) {
messages.shift();
}
} catch (_) {
// Clear out error if an error occurred
common.state.error = null;
}
var output = format.apply(null, messages);
// Add newline if -n is not passed.
if (!options.no_newline) {
output += '\n';
}
process.stdout.write(output);
return output;
}
module.exports = _echo;
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