From c6c9f4f5a837bea16609b1d430e6c20687f3742b Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sun, 28 May 2017 18:21:44 +0800
Subject: implement `--help options` (#2017)

---
 bin/uglifyjs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'bin')

diff --git a/bin/uglifyjs b/bin/uglifyjs
index 158dc571..b9406e1c 100755
--- a/bin/uglifyjs
+++ b/bin/uglifyjs
@@ -25,6 +25,18 @@ program.version(info.name + ' ' + info.version);
 program.parseArgv = program.parse;
 program.parse = undefined;
 if (process.argv.indexOf("ast") >= 0) program.helpInformation = UglifyJS.describe_ast;
+else if (process.argv.indexOf("options") >= 0) program.helpInformation = function() {
+    var text = [];
+    var options = UglifyJS.default_options();
+    for (var option in options) {
+        text.push("--" + (option == "output" ? "beautify" : option == "sourceMap" ? "source-map" : option) + " options:");
+        Object.keys(options[option]).forEach(function(name) {
+            text.push("  " + name);
+        });
+        text.push("");
+    }
+    return text.join("\n");
+};
 program.option("-p, --parse <options>", "Specify parser options.", parse_js("parse", true));
 program.option("-c, --compress [options]", "Enable compressor/specify compressor options.", parse_js("compress", true));
 program.option("-m, --mangle [options]", "Mangle names/specify mangler options.", parse_js("mangle", true));
-- 
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