Re: differences between a nmap that call and a nmap with let... (nmap, javacomplete, maven)

On Wed, 4 Jul 2012, Roberto S. wrote:

> Hi, I'm configuring a variable called $CLASSPATH in order to have javacomplete plugin running well.
> I'm using a software called "maven" to build the project and I have found that executing this command:
> mvn dependency:build-classpath | grep -v "^\["
> gives me exactly the classpath it use to compile the project... so using this to generate $CLASSPATH seems to be the better way.
>
> To assign that output to $CLASSPATH using <Leader>cp, I have done:
> function! ReadMvnClasspath()
> let $CLASSPATH=system('echo \"`mvn dependency:build-classpath | grep -v "^\["`\"')

Your command is needlessly complex. Wrapping the `mvn` command in
backticks tells the shell to capture the output as a string. Wrapping
the backticks in double-quotes prevents the shell treating spaces
specially. But then you just echo the output that you captured as a
string. So, it's easier to just not capture the output with backticks.
This part of the command is all you need:

mvn dependency:build-classpath | grep -v "^\["

(Full command:)
let $CLASSPATH=system('mvn dependency:build-classpath | grep -v "^\["')


> endfunction
> au BufRead,BufNew *.java nmap <Leader>cp :call ReadMvnClasspath()<CR>
>
> and this run well.
> The question is: can you explaing why if I try to avoid the function with next command, I obtain an error at startup?
> au BufRead,BufNew *.java nmap <Leader>cp :let $CLASSPATH=system('echo \"`mvn dependency:build-classpath | grep -v "^\["`\"')
>
> Doing this I obtain at startup:
> :!grep -n -v "^\["`\"') /dev/null 2>&1| tee /tmp/<afile>
> /bin/bash: -c line 0: unexpected EOF while looking for matching ``'

I'm not sure precisely. Best guess is that Vim treats '|' specially in
different contexts. It might work if you replace '|' with '<bar>' in
your command. (Can't seem to find the relevant help text.)

--
Best,
Ben

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