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POSyntax highlight for perl in Emacs is broken, is there a fix?
 

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  1. POSyntax highlight for perl in Emacs is broken, is there a fix?
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    <p>I'm a perl programmer and a new emacs user. I'm under Windows, using cperl-mode for editing perl. Emacs version is 24.2.1. Here's a screenshot with some sample code:</p> <p><a href="http://breqwas.net/dropbox/perlsyn_emacs.png" rel="nofollow noreferrer">http://breqwas.net/dropbox/perlsyn_emacs.png</a></p> <ol><li>Obvious bug: it highlights arrays, hashes and non-quoted literal values in ( a => "b" ) style lists <i>inside comments</i></li> <li>One more bug: it highligts the first word in a regular expression as an array because of non-default quote symbol</li> <li>Not a bug, but looks weird: it highlights arrays and hashes any time when they are used (even in comments, huh), but scalars are highlighted only when declared</li> <li>Not a bug, but looks weird: same story with functions: highlighted when declared, not when called</li> <li>Not a bug, but looks weird: why do "print", "say" and "system" have different colors?</li></ol> <p>I could keep going, but I hope that explains the word "broken" pretty well.</p> <p>Then I learned the magic C-u C-x = key combination, which shows, among other stuff, the text properties for the text under the cursor, hoping to make a better coloring scheme of my own. At this point it started making even less sense.</p> <p>"print" has <i>cperl-nonoverridable-face</i>. "die" has <i>font-lock-keyword-face</i>. Meanwhile, both are functions and can be (and often are) overrided. "system" has <i>font-lock-type-face</i>. Why? Function declarations have <i>font-lock-function-name-face</i> - that's OK, but so do the arguments of "use". Why? Function calls and scalars don't have face property at all and can't be highlighted. Why? Etc, Etc. Again, I could keep going.</p> <p>Is there a way to fix all that? Is there some config where I can remap lexical units to some other font-faces, or some other way to make the syntax highlight less crazy?</p> <p>To avoid the "perl is unparsible" talk, here's a screenshot of the editor I'm migrating from, with the very same code: <a href="http://breqwas.net/dropbox/perlsyn_pn.png" rel="nofollow noreferrer">http://breqwas.net/dropbox/perlsyn_pn.png</a>. Looks much more reasonable. </p> <hr> <p><strong>Upd:</strong> By now (3 weeks after asking this question here) I did not find a cure. All perl programmers who use emacs I know just ignore these problems. No better perl highlighters for emacs seem to exist. Reading cperl-mode docs provides some explanations (the choice of faces for various elements seems less crazy now), but does not provide any answers. I wrote an email to cperl-mode maintainer with these questions and some more digging I did, but got no reply.</p> <p>Yep, you got that right: seems like emacs community was not able to make a good perl syntax highligting in 25 years that perl is around. That's a sad story.</p>
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    1. USArtyom V. Kireev
    1. USArtyom V. Kireev
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      1. POSyntax highlight for perl in Emacs is broken, is there a fix?
      1. USKosuke Arisawa
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    1. COI am just living with that. Consider setting `cperl-highlight-variables-indiscriminately` to `t`.
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