feature: minify: add support of --auto

README.md

@@ -23,6 +23,17 @@ npm i minify -g
 
 ### CLI
 
+```sh
+Usage: minify [options]
+Options:
+  -h, --help                  display this help and exit
+  -v, --version               display version and exit
+  --js                        minify javascript
+  --css                       minify css
+  --html                      minify html
+  --auto                      auto detect format
+```
+
 The bash command below creates a code snippet saved as `hello.js`.
 
 Simply copy + paste the code starting with cat, including the EOT on the last line, and press <enter>.

bin/minify.js

@@ -27,7 +27,7 @@ process.on('uncaughtException', (error) => {
         log(error);
 });
 
-minify();
+await minify();
 
 function readStd(callback, options) {
     const {stdin} = process;
@@ -60,7 +60,7 @@ async function minify() {
     if (optionsError)
         return log.error(optionsError.message);
     
-    if (/^--(js|css|html)$/.test(In))
+    if (/^--(js|css|html|auto)$/.test(In))
         return readStd(processStream, options);
     
     await uglifyFiles(files, options);

help.json

@@ -3,5 +3,6 @@
     "-v, --version              ": "display version and exit",
     "--js                       ": "minify javascript",
     "--css                      ": "minify css",
-    "--html                     ": "minify html"
+    "--html                     ": "minify html",
+    "--auto                     ": "auto detect format"
 }

lib/auto.js

@@ -0,0 +1,26 @@
+import tryToCatch from 'try-to-catch';
+import js from './js.js';
+import html from './html.js';
+import css from './css.js';
+import img from './img.js';
+
+const minifiers = [
+    js,
+    css,
+    html,
+    img,
+];
+
+export default async (data, options) => {
+    let error;
+    let result;
+    
+    for (const minify of minifiers) {
+        [error, result] = await tryToCatch(minify, data, options);
+        
+        if (result)
+            return result;
+    }
+    
+    throw error;
+};

lib/minify.js

@@ -6,6 +6,7 @@ import js from './js.js';
 import html from './html.js';
 import css from './css.js';
 import img from './img.js';
+import auto from './auto.js';
 
 const log = debug('minify');
 
@@ -14,6 +15,7 @@ const minifiers = {
     html,
     css,
     img,
+    auto,
 };
 
 const {assign} = Object;

test/minify.js

@@ -21,6 +21,19 @@ test('minify: js', async (t) => {
     t.end();
 });
 
+test('minify: auto', async (t) => {
+    const js = 'function hello(world) {\nconsole.log(world);\n}';
+    
+    const code = await putoutMinify(js, {
+        removeUnusedVariables: false,
+    });
+    
+    const expected = 'function hello(a){console.log(a)}';
+    
+    t.equal(code, expected);
+    t.end();
+});
+
 test('minify: js: with alternate options', async (t) => {
     const js = 'const a = 5, b = 6; console.log(a);';
     const expected = 'const a=5,b=6;';