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copied!<p>Emacs 23.2 includes js-mode, which is a renamed and touched-up Espresso. I just did "indent-region" on your redunkulous code and got this: </p> <pre><code>var o = { foo : 'bar' , baz : 'foo' } , p , q = new Squash( o , { start: 0 , limit: 50 } ) </code></pre> <p>I guess that's not exactly what you want. The commas are offset differently than you probably like. </p> <p>(Gosh that's ugly.)</p> <hr> <p><strong>EDIT</strong><br> Ok I looked into js-mode and the indentation seems to be done by <code>js--proper-indentation</code>. It looks at the current line and then tries to make decisions about how to indent. </p> <p>It's got a bunch of conditions it tests, for various syntax patterns. I just put in a check for a line starting with a comma, and got these results: </p> <pre><code>var o = { foo : 'bar' , baz : 'foo' } , p , q = new Squash( o , { start: 0 , limit: 50 } ) </code></pre> <p>I think that is what you want, but it still looks totally broken to me. Anyway this is how I did it. </p> <p>Inject this cond into the top of the list for <code>js--proper-indentation</code>: </p> <pre><code>(defun js--proper-indentation (parse-status) "Return the proper indentation for the current line." (save-excursion (back-to-indentation) (cond ((looking-at ",") (let ((spos (save-excursion (while (looking-back "}[\t\n ]*") (backward-sexp) (if (looking-back ",[\t\n ]*") (re-search-backward ",[\t\n ]*"))) (cond ((looking-back "\\(,\\|(\\)[ \t]*\\<\\([^:=\n\t ]+\\)[ \t\n]*") (re-search-backward "\\(,\\|(\\)[ \t]*\\<\\([^:=\n\t ]+\\)[ \t\n]*" (point-min) t) (+ (current-column) 2)) ((re-search-backward "\\<\\([^:=\n\t ]+\\)[ \t]*\\(:\\|=\\)" (point-min) t) (current-column)) (t nil))))) (if spos (- spos 2) (+ js-indent-level js-expr-indent-offset)))) .... </code></pre> <p>Be sure to keep the rest of the conditions in that defun - I don't know what they do but the're probably important. </p> <p>No idea if this is robust, I haven't tested it except for your one test case. But this oughta get you started. </p>

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