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    <p>Okay, this is very rough-and-ready, but it appears to work (at least in simple cases).</p> <p>First of all here is a function which performs a vimgrep on a given a file. This needs to be a separate function so it can be called silently later on.</p> <pre><code>function! File_Grep( leader, file ) try exe "vimgrep /" . a:leader . "/j " . a:file catch /.*/ echo "no matches" endtry endfunction </code></pre> <p>Now here is a custom-completion function which calls <code>File_Grep()</code> and returns a list of matching words. The key is the call to the <code>add()</code> function, which appends a match to the list if search term (<code>a:base</code>) appears ANYWHERE in the string. (See <code>help complete-functions</code> for the structure of this function.)</p> <pre><code>function! Fuzzy_Completion( findstart, base ) if a:findstart " find start of completion let line = getline('.') let start = col('.') - 1 while start &gt; 0 &amp;&amp; line[start - 1] =~ '\w' let start -= 1 endwhile return start else " search for a:base in current file let fname = expand("%") silent call File_Grep( a:base, fname ) let matches = [] for this in getqflist() call add(matches, matchstr(this.text,"\\w*" . a:base . "\\w*")) endfor call setqflist([]) return matches endif endfunction </code></pre> <p>Then you just need to tell Vim to use the complete function:</p> <pre><code>set completefunc=Fuzzy_Completion </code></pre> <p>and you can use <code>&lt;c-x&gt;&lt;x-u&gt;</code> to invoke the completion. Of course, the function could be used to search any file, rather than the current file (just modify the <code>let fname</code> line).</p> <p>Even if this isn't the answer you were looking for, I hope it aids you in your quest!</p>
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    1. USPrince Goulash
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    1. COThanks @Prince! It works perfectly!
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    2. COWanted to test it… and was on a [Scratch] buffer (no file name…) of course `vimgrep` fails in this case. For the rest it is very nice.
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    3. COIf you have all the header files in a folder and want to search, replace fname as below: let fname = "path_to_folder/include/**.h"
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