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POemacs C/C++ indentation: different for pre and post comments // or: how can I make certain comments like //^ be indented extra?
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copied!<p>BRIEFEST:</p> <p>The original question boiled down to:</p> <p>Many if not most emacs c indentation styles make comments on a line by themselves, e.g. </p> <pre><code>// ... </code></pre> <p>indent to match the surrounding code.</p> <p>I want to make comments that look like //+ or //- be indented one or more indent settings more than the surrounding code.</p> <p>I usually think of this in terms of having same-indentation-level comments apply to the next lines of code, and extra-indentation-level comments apply to preceding lines of code. But that's just style.</p> <p>BRIEF:</p> <p>Are there (reasonably standard) emacs settings to obtain different indentation for C/C++ comments, depending on whether the comment is associated with the next line (in which case I want it indented appropriately for the syntax) or whether the comment is associated with the previous line (in which case I want it indented an additional level)?</p> <p>E.g.</p> <pre><code>int foo() { // this comment is for the variable bazz below int bazz; //- this comment is for the variable bazz,on the line above. //- I want it indented an extra level, which I will do by hand here. // this comment is for the next variable, biff int biff; int example; /* comment * on multiple lines * but this can be too much indented */ int example_of_a_really_long_name_that_can_produce_excessive_indentation; /* comment * on multiple lines * but this can be too much indented */ } </code></pre> <p>The comments beginning //and //- are pretty much what I want. // is indented along with the surrounding code. This is what emacs gives me.</p> <p>I would like //- to be indented an extra indentation level. Or //+,or whatever, if there is a convention. Sounds like a job for a regexp.</p> <p>I provide examples of what I know how to do for // and /<em>. The /</em> comments get spread over multiple lines, but can be excessively indented.</p> <p>DETAIL:</p> <p>I am just now installing emacs 24.1 - or at least I hope I am installing it, the systems at work have very old and crankly distros. But if something works on older emacs, such as 21.4.1, I'd e even happier - avoiding the hassle of having to install emacs on many different systems.</p> <p>================================</p> <p>By the way, I already know about c-indent-comment-syntactically, and much of cc-mode.el.</p> <p>In particular, c-indent-comment-syntactically gives me:</p> <pre><code>int foo() { // this comment is for the variable bazz below int bazz; //- this comment is for the variable bazz,on the line above. //- I want it indented an extra level, which I will do by hand here. // this comment is for the next variable, biff int biff; int example; /* comment * on multiple lines * but this can be too much indented */ int example_of_a_really_long_name_that_can_produce_excessive_indentation; /* comment * on multiple lines * but this can be too much indented */ if( foo ) // comment bar(); if( foo ) { // comment bar(); } } </code></pre> <p>This is not what I want. I want the //- comment lines to be indented an extra indent level.</p> <p>Heck, why not something like elisp:</p> <p>/// <-- start in columno 0</p> <p>// indented syntactically (pertaining to next line of code)</p> <p>or perhaps //^ (the ^ indicates "above".</p> <p>//- or //^ - indented an extra indent level (pertaining to previous line of code.</p>

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