I explored running jsbeautify [1] on the MobileFrontend codebase and looked at how the output differs from the current styling. It introduces various rules that MobileFrontend is currently not adhering too. MobileFrontend already uses jscs [2] so we want to make sure the outputs of both are compatible. Here is my report on that with the recommendation that we should use it.
#Rule 1: object properties defined on a single line. e.g. { foo: 2, bar: 3 } NOT { foo: 2, bar: 3 }
I think this would be a good idea to adopt. I will explore if jscs can enforce this.
# Rule 2: variables that are initialised must be followed by a new line (although I noted a few odd cases e.g. in Page.js after a "?:" expression and /MobileWebClickTracking.js e.g. var Foo, bar = $( 'div' ), Baz, Bar;
not: var Foo, bar = $( 'div' ), Baz, Bar;
This will be fixed if I implement https://trello.com/c/0dkx0ldL
# Rule 3: All chained events should be indented e.g. foo() .bar();
not foo(). bar();
Seems like a no brainer. One that happens naturally most of the time.
# Rule 4: Spacing in object parameters e.g. foo[ 1 ] [ 1, 2, 3, 4 ]
not: foo[1] [1, 2, 3, 4]
This is different to MediaWiki coding conventions but I can implement https://github.com/beautify-web/js-beautify/issues/424 to give us this. We seem a bit inconsistent ourselves with this convention - let me know how you think this rule should work in our codebase...
# Rule 5: New line after variable declarations
var x, y, z;
z();
not: var x, y, z; z();
Also: function foo() {}
function bar() {}
not: function foo() {} function bar() {}
Seems like a no brainer and shouldn't introduce any major issues with code review.
# Rule 6: Comments must respect the current indentation level
if () { ... // If i is 5 we do something special } else if ( i === 5 ){
} becomes if () { ... // If i is 5 we do something special } else if ( i === 5 ){
} We'll have to think about what to do with these comments but I don't think this should be a blocker to using jsbeautify. It will only pop up occasionally.
# Rule 7: On long if statements the curly brace must be indented. And the first condition should be on the same line
if ( enableToc || ... .... && baz ) {
not: if ( enableToc || ... .... && baz ) {
Again I'm not sure if this will happen too often. This to me is a sign that we should be using functions rather than long if statements personally. Again not a blocker.
Actions: * Implement https://github.com/beautify-web/js-beautify/issues/424 * You guys need to advise me on how we should handle square brackets in our codebase in such a way we respect MediaWiki coding conventions and come up with a consistent style we are happy with and can adhere to. * I'll implement https://trello.com/c/0dkx0ldL in some form * I'll explore if jscs can support objects defined on new line * When the above are done I recommend we turn on jsbeautify for the project.
I've setup a tracking card for the above work: https://trello.com/c/5btWf2JN/90-snakes-on-a-plane and will be looking at these problems today.
[1] https://github.com/beautify-web/js-beautify [2] https://github.com/jscs-dev/node-jscs