55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
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#!/usr/bin/env node
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/* All of the following commands are equivalent and write `foo\tbar foo` to out.txt
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$ ./echo.js -n -e --output=out.txt "foo\tbar" "foo"
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$ ./echo.js --newline --escape --output "out.txt" "foo\tbar" "foo"
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$ ./echo.js -ne --output=out.txt "foo\tbar" "foo"
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$ ./echo.js -en --output="out.txt" "foo\tbar" "foo"
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*/
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var cli = require('cli');
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cli.parse({
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newline: ['n', 'Do not output the trailing newline'],
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escape: ['e', 'Enable interpretation of backslash escapes'],
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separator: ['s', 'Separate arguments using this value', 'string', ' '],
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output: [false, 'Write to FILE rather than the console', 'file']
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});
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cli.main(function (args, options) {
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var output = '', i, j, l, output_stream;
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if (this.argc) {
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if (options.escape) {
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var replace = {'\\n':'\n','\\r':'\r','\\t':'\t','\\e':'\e','\\v':'\v','\\f':'\f','\\c':'\c','\\b':'\b','\\a':'\a','\\\\':'\\'};
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var escape = function (str) {
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str += '';
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for (j in replace) {
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str = str.replace(i, replace[i]);
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}
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return str;
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}
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for (i = 0, l = this.argc; i < l; i++) {
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args[i] = escape(args[i]);
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}
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options.separator = escape(options.separator);
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}
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output += args.join(options.separator);
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}
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if (!options.newline) {
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output += '\n';
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}
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try {
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if (options.output) {
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output_stream = this.native.fs.createWriteStream(options.output)
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} else {
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output_stream = process.stdout;
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}
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output_stream.write(output);
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} catch (e) {
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this.fatal('Could not write to output stream');
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}
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});
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