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    <p>Okay, forgive me for answering twice, but since my first attempt missed the point, I'll have another go. This is more complicated than I thought, but possibly not as complicated as I have made it (!).</p> <p><strong>This is now modified to suggest all matching variable names.</strong></p> <p>First of all, here's a function to generate the 'mCC' abbreviation from the 'myCamelCase' string:</p> <pre><code>function! Camel_Initials(camel) let first_char = matchstr(a:camel,"^.") let other_char = substitute(a:camel,"\\U","","g") return first_char . other_char endfunction </code></pre> <p>Now, here's a function that takes an abbreviation ('mCC') and scans the current buffer (backwards from the current line) for "words" that have this abbreviation. <strong>A list of all matches is returned:</strong></p> <pre><code>function! Expand_Camel_Initials(abbrev) let winview=winsaveview() let candidate=a:abbrev let matches=[] try let resline = line(".") while resline &gt;= 1 let sstr = '\&lt;' . matchstr(a:abbrev,"^.") . '[a-zA-Z]*\&gt;' keepjumps let resline=search(sstr,"bW") let candidate=expand("&lt;cword&gt;") if candidate != a:abbrev &amp;&amp; Camel_Initials(candidate) == a:abbrev call add( matches, candidate ) endif endwhile finally call winrestview(winview) if len(matches) == 0 echo "No expansion found" endif return sort(candidate) endtry endfunction </code></pre> <p>Next, here's a custom-completion function that reads the word under the cursor and suggests the matches returned by the above functions:</p> <pre><code>function! Camel_Complete( findstart, base ) if a:findstart let line = getline('.') let start = col('.') - 1 while start &gt; 0 &amp;&amp; line[start - 1] =~ '[A-Za-z_]' let start -= 1 endwhile return start else return Expand_Camel_Initials( a:base ) endif endfunction </code></pre> <p><strong>To make use of this, you must define the "completefunc":</strong></p> <pre><code>setlocal completefunc=Camel_Complete </code></pre> <p>To use insert-mode completion, type <kbd>CTRL-X</kbd> <kbd>CTRL-U</kbd>, but I usually map this to <kbd>CTRL-L</kbd>:</p> <pre><code>inoremap &lt;c-l&gt; &lt;c-x&gt;&lt;c-u&gt; </code></pre> <p>With this code in your vimrc you should find that typing <code>mCC</code> followed by <kbd>CTRL-L</kbd> will make the expected replacement. If no matching expansion is found, the abbreviation is unchanged.</p> <p>The code isn't water-tight, but it works in all the simple cases I tested. Hope it helps. Let me know if anything needs elucidating.</p>
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    1. COAmazing! That's all I can say. Still I am greedy/lazy enough to ask you for more. If there are more than one possible expansions : e.g. myCamelCase myCamelCart, the last one is chosen. Instead, can it be made to behave like Ctrl-P keyword completion in vim? Again, Amazing!
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    2. COI'm glad it worked! Handling multiple matches should just be a matter of getting Expand_Camel_Initials() to return a list of solutions and then setting the `completefunc` to let you choose between then. I'll try and have a look at it later this week.
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    3. COOkay, it wasn't as painful as I thought... I have edited my answer and it should now work as you wish. Let me know if you have any problems (I haven't had a chance to test it properly).
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