109 lines
3.5 KiB
Markdown
109 lines
3.5 KiB
Markdown
# readlineSync
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Synchronous [Readline](http://nodejs.org/api/readline.html) for interactively running.
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The interface is used with process.stdin and process.stdout in order to accept user input.
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## Example
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```js
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var readlineSync = require('readline-sync');
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var answer = readlineSync.question('What is your favorite food? :');
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console.log('Oh, so your favorite food is ' + answer);
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```
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## Installation
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```
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npm install readline-sync
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```
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## Usage
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### setPrompt
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```js
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readlineSync.setPrompt(prompt)
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```
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Sets the prompt, for example when you run `node` on the command line, you see `> `, which is node's prompt.
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### prompt
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```js
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line = readlineSync.prompt([options])
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```
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Readies readline for input from the user, putting the current `setPrompt` options on a new line, giving the user a new spot to write.
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If `{noEchoBack: true}` is specified to `options`, echo back is avoided. It is used to hide the password which is typed by user on screen. *See [Note](#note) for security.*
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### question
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```js
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line = readlineSync.question(query[, options])
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```
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Displays the `query` to the user, and then returns the user's response after it has been typed.
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If `{noEchoBack: true}` is specified to `options`, echo back is avoided. It is used to hide the password which is typed by user on screen. *See [Note](#note) for security.*
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### setEncoding
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```js
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readlineSync.setEncoding(encoding)
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```
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Set the encoding method of input (user's response) and output (`prompt`). Defaults to 'utf8'.
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### setPrint
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```js
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readlineSync.setPrint(funcPrint)
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```
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The specified Function is called when any texts are outputed (`prompt` and `question`). Two arguments the text which is outputed and `encoding` are passed. Defaults to `undefined`.
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For example, this is used to pass plain texts to Logger, when prompt texts are colored.
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```js
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var readlineSync = require('readline-sync');
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user, pw, cmd;
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require('colors');
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readlineSync.setPrint(function(display, encoding) {
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logger.log(display.stripColors); // remove control characters
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});
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console.log('Your account required.'.grey);
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user = readlineSync.question('USER NAME'.white.inverse + ': ');
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pw = readlineSync.question('PASSWORD'.white.inverse + ': ', {noEchoBack: true});
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// Authorization ...
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console.log(('Welcome, ' + user + '!').green.bold);
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readlineSync.setPrompt('> '.bold.red);
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cmd = readlineSync.prompt();
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```
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## <a name ="note">Note</a>
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+ The your Node and OS may not support interactively reading from stdin. The stdin interfaces are different by platforms.
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If in those platforms, an error is thrown.
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```js
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try {
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answer = readlineSync.question('What is your favorite food? :');
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} catch (e) {
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console.error(e);
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process.exit(1);
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}
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```
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+ If `options.noEchoBack` is used, the text that input by user is saved to temporary file (e.g. `/tmp/readline-sync.stdout`). This file is removed immediately after reading is done, but you have to be careful about it because this text is *plain*. Removing the file might fail, or the file might be peeped before it is removed.
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## Release History
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* 2014-07-12 v0.4.1 `setPrompt()` and `question()` accept the value which is not string too (e.g. number, Date, Object, etc.).
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* 2014-07-12 v0.4.0 Add `options.noEchoBack`.
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* 2014-07-12 v0.3.0 Add `setPrint()`.
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* 2014-06-27 v0.2.3 Add alternative reading via shell on the environment which don't support interactively reading.
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* 2013-12-18 v0.2.2 Error handle for the environment which don't support interactively reading from stdin.
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* 2013-08-30 v0.2.0 Rewrite exporting methods.
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* 2013-08-29 v0.1.0 Initial release.
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