cli.js in condenser-0.0.5

- old
+ new
@@ -1,41 +1,112 @@
 #!/usr/bin/env node
 
-// cli.js
-// JSON5 command-line interface.
-//
-// This is pretty minimal for now; just supports compiling files via `-c`.
-// TODO More useful functionality, like output path, watch, etc.?
+const fs = require('fs')
+const path = require('path')
+const minimist = require('minimist')
+const pkg = require('../package.json')
+const JSON5 = require('./')
 
-var FS = require('fs');
-var JSON5 = require('./json5');
-var Path = require('path');
+const argv = minimist(process.argv.slice(2), {
+    alias: {
+        'convert': 'c',
+        'space': 's',
+        'validate': 'v',
+        'out-file': 'o',
+        'version': 'V',
+        'help': 'h',
+    },
+    boolean: [
+        'convert',
+        'validate',
+        'version',
+        'help',
+    ],
+    string: [
+        'space',
+        'out-file',
+    ],
+})
 
-var USAGE = [
-    'Usage: json5 -c path/to/file.json5 ...',
-    'Compiles JSON5 files into sibling JSON files with the same basenames.',
-].join('\n');
+if (argv.version) {
+    version()
+} else if (argv.help) {
+    usage()
+} else {
+    const inFilename = argv._[0]
 
-// if valid, args look like [node, json5, -c, file1, file2, ...]
-var args = process.argv;
+    let readStream
+    if (inFilename) {
+        readStream = fs.createReadStream(inFilename)
+    } else {
+        readStream = process.stdin
+    }
 
-if (args.length < 4 || args[2] !== '-c') {
-    console.error(USAGE);
-    process.exit(1);
+    let json5 = ''
+    readStream.on('data', data => {
+        json5 += data
+    })
+
+    readStream.on('end', () => {
+        let space
+        if (argv.space === 't' || argv.space === 'tab') {
+            space = '\t'
+        } else {
+            space = Number(argv.space)
+        }
+
+        let value
+        try {
+            value = JSON5.parse(json5)
+            if (!argv.validate) {
+                const json = JSON.stringify(value, null, space)
+
+                let writeStream
+
+                // --convert is for backward compatibility with v0.5.1. If
+                // specified with <file> and not --out-file, then a file with
+                // the same name but with a .json extension will be written.
+                if (argv.convert && inFilename && !argv.o) {
+                    const parsedFilename = path.parse(inFilename)
+                    const outFilename = path.format(
+                        Object.assign(
+                            parsedFilename,
+                            {base: path.basename(parsedFilename.base, parsedFilename.ext) + '.json'}
+                        )
+                    )
+
+                    writeStream = fs.createWriteStream(outFilename)
+                } else if (argv.o) {
+                    writeStream = fs.createWriteStream(argv.o)
+                } else {
+                    writeStream = process.stdout
+                }
+
+                writeStream.write(json)
+            }
+        } catch (err) {
+            console.error(err.message)
+            process.exit(1)
+        }
+    })
 }
 
-var cwd = process.cwd();
-var files = args.slice(3);
+function version () {
+    console.log(pkg.version)
+}
 
-// iterate over each file and convert JSON5 files to JSON:
-files.forEach(function (file) {
-    var path = Path.resolve(cwd, file);
-    var basename = Path.basename(path, '.json5');
-    var dirname = Path.dirname(path);
+function usage () {
+    console.log(
+        `
+  Usage: json5 [options] <file>
 
-    var json5 = FS.readFileSync(path, 'utf8');
-    var obj = JSON5.parse(json5);
-    var json = JSON.stringify(obj, null, 4); // 4 spaces; TODO configurable?
+  If <file> is not provided, then STDIN is used.
 
-    path = Path.join(dirname, basename + '.json');
-    FS.writeFileSync(path, json, 'utf8');
-});
+  Options:
+
+    -s, --space              The number of spaces to indent or 't' for tabs
+    -o, --out-file [file]    Output to the specified file, otherwise STDOUT
+    -v, --validate           Validate JSON5 but do not output JSON
+    -V, --version            Output the version number
+    -h, --help               Output usage information`
+    )
+}