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POEmacs compilation-mode regex for multiple lines
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  1. POEmacs compilation-mode regex for multiple lines
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    copied!<p>So I have a tool lints python changes I've made and produces errors and warnings. I would like this to be usable in compile mode with Emacs, but I have an issue. The file name is output only once at the beginning, and then only line numbers appear with the errors and warnings. Here's an example:</p> <pre><code>Linting file.py E0602: 37: Undefined variable 'foo' C6003: 42: Unnecessary parens after 'print' keyword 2 new errors, 2 total errors in file.py. </code></pre> <p>It's very similar to pylint, but there's no output-format=parseable option. I checked the documentation for compilation-error-regexp-alist, and found something promising:</p> <blockquote> <p>If FILE, LINE or COLUMN are nil or that index didn't match, that<br> information is not present on the matched line. In that case the<br> file name is assumed to be the same as the previous one in the<br> buffer, line number defaults to 1 and column defaults to<br> beginning of line's indentation.</p> </blockquote> <p>So I tried writing a regexp that would optionally match the file line and pull it out in a group, and then the rest would match the other lines. I assumed that it would first match</p> <pre><code>Linting file.py E0602: 37: Undefined variable 'foo' </code></pre> <p>and be fine. Then it would continue and match</p> <pre><code>C6003: 42: Unnecessary parens after 'print' keyword </code></pre> <p>with no file. Since there was no file, it should use the file name from the previous match right? Here's the regexp I'm using:</p> <pre><code>(add-to-list 'compilation-error-regexp-alist 'special-lint) (add-to-list 'compilation-error-regexp-alist-alist '(special-lint "\\(Linting \\(.*\\)\\n\\)?\\([[:upper:]][[:digit:]]+:\\s-+\\([[:digit:]]\\)+\\).*" 2 4 nil nil 3)) </code></pre> <p>I've checked it with re-builder and manually in the scratch buffer. It behaves as expected. the 2nd group is the file name, the 4th is the line number, and the 3rd is what I want highlighted. Whenever I try this, I get the error:</p> <pre><code>signal(error ("No match 2 in highlight (2 compilation-error-face)")) </code></pre> <p>I have a workaround for this that involves transforming the output before the compile module looks at it, but I'd prefer to get rid of that and have a "pure" solution. I would appreciate any advice or pointing out any dumb mistakes I may have made.</p> <p><strong>EDIT</strong></p> <p>Thomas' pseudo code below worked quite well. He mentioned that doing a backwards re search could mess up the match data, and it did. But that was solved by adding the <code>save-match-data</code> special form before <code>save-excursion</code>.</p>
 

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