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I am trying to build my own indent file for JavaScript. The default indent file for JavaScript turns cindent on, with minimal modifications, and I am using that as a base.

On Vim 7.3 for OSX El Capitan, typing an array produces the following by default:

var test = [
1,
    2,
    3
    ];

And note, while not legal JavaScript, I noticed not using a comma produces a slightly different behavior:

var test = [
1
2
3
];

On 7.4, typing the above two examples produces what I expect:

var test = [
    1,
    2,
    3
];

var test = [
    1
    2
    3
];

However, if you include some characters immediately following the open square bracket it goes back out of whack:

var test = [1
2,
    3,
    4
];

What controls the indentation of the lines between square brackets as well as the placement of the closing square bracket? When viewing the Vim documentation, I don't see a cinoptions value that captures this.

  • 1
    Have you tried this one github.com/pangloss/vim-javascript ? – Ôrel Mar 26 '16 at 23:06
  • 1
    I have but that plugin appears to indent everything from scratch using custom VimScript functions instead of built in rules. – Ryan Jarvis Mar 27 '16 at 21:16
1

Judging from your comment above, you want to use only cinoptions to control the indent for square brackets. It simply wasn't possible before 7.4.355 from what I see in the source code. Click blame up top to see the tagged version, but it's going take a while to load.

Since it looks like cinoptions was originally for C, C++, and Java, it only dealt with curly braces and parenthesis because square brackets are used for defining array sizes or accessing indexes in those languages-not initializing them.

What controls the indentation of the lines between square brackets as well as the placement of the closing square bracket?

After 7.4.355, it's the J option that controls the indentation, but nothing specifically for square brackets. From what I glossed over in the source, the J option only signifies that JavaScript syntax should be considered (curbuf->b_ind_js). It looks for a previous line that's terminated by a comma or opening bracket to line up with. In your fourth example, the line ends with a 1, so it doesn't increase the indentation.

If the first line in your fourth example ended with a [ or , (or both [,) the subsequent lines would increase the indent.

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