feat: add reverse lookup option (--reverse, -r) feature to CLI

* Find extension from mime type using cli

Add an option to lookup extension based on mime from cli

* Update cli.js

fix reuse of mime variable

* Update test.js

* test for reverse lookup

* Use last argument for --reverse lookup in cli.js

* chore: remove '--r' case

Co-authored-by: leevers <leevers@gmail.com>

cli.js

@@ -23,6 +23,7 @@ if (args.includes('--version') || args.includes('-v') || args.includes('--v')) {
     --help, -h                     Show this message
     --version, -v                  Display the version
     --name, -n                     Print the name of the program
+    --reverse, -r                  Print the extension of the mime type
 
   Note: the command will exit after it executes if a command is specified
   The path_or_extension is the path to the file or the extension of the file.
@@ -32,11 +33,17 @@ if (args.includes('--version') || args.includes('-v') || args.includes('--v')) {
     mime --version
     mime --name
     mime -v
+    mime --reverse application/text
     mime src/log.js
     mime new.py
     mime foo.sh
   `);
   process.exit(0);
+} else if (args.includes('--reverse') || args.includes('-r')) {
+  let mimeType = args[args.length-1];
+  let extension = mime.getExtension(mimeType);
+  process.stdout.write(extension + '\n');
+  process.exit(0);
 }
 
 let file = args[0];

src/test.js

@@ -301,5 +301,13 @@ describe('mime CLI', function() {
       done();
     });
   });
+
+  it('returns extension', function(done) {
+    exec('./cli.js -r video/mpeg', (err, stdout, stderr) => {
+      if (err) done(err);
+      assert.equal(stdout, 'mpeg\n');
+      done();
+    });
+  });
 });