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I want a function to change underline word to little camel for one line.
When I use <shift+v>:s/_\(\w\)/\u\1/g, it work fine.
And then I want to make a function to simplify it, <shift+v>:ToLittleCamel
" underline to little camel
:command ToLittleCamel call ToLittleCamel()
function! ToLittleCamel()
s/_\(\w\)/\u\1/g
endfunction
but it doesn't work.
If you want to use a :command, I would suggest defining it with -range and passing along the line numbers:
:command -range ToLittleCamel <line1>,<line2>call ToLittleCamel()
This works because when :call has a range and its function is not range, it execute the function once on every line of the range.
You can also make the function range (but keep the call the same above):
function ToLittleCamel() range
execute a:firstline ',' a:lastline 'substitute /_\(\w\)/\u\1/g'
endfunction
References:
:help :command-range:help :command-repl:help <line1>:help :call:help function-range-example:help :func-range
ToLittleCamel() function to turn it into a range function. It's possible to get that from the docs, but it would be nice to include it in the answer, for this simple example.