kf5-config, startkde and bug 333793

[Luca Beltrame]

Hello,

I set out an attempt to fix bug 333793 [1] and to port kf5-config in 
kdelibs4support to QCommandLineParser and QStandardPaths where possible.

The issue in the bug is that kf5-config --path lib misses ~/.local (XDG) 
because basePrefixForResource (kstandarddirs.cpp) says (lines 244-250):

    if (typeBa.startsWith("xdgconf") || typeBa == "config") {
        return XdgConf;
    } else if (typeBa == "exe" || typeBa == "lib") {
        return KdePrefixes;
    } else { // was: if (typeBa.startsWith("xdgdata") || typeBa == "data")
        return XdgData;
    }

The problem is, we're not using KdePrefixes anymore and thus --path lib is 
broken in interesting ways. the most important being the impossibility of 
sourcing env scripts in the user's $HOME (~/.local/env), which may break 
some user customization (see the bug report).

The problem is also lies in startkde which uses that option to parse for env 
scripts.

So, there are 2 possible solutions:

1. Fix KStandardDirs: I tried to dive into the coe but I really can't figure 
out to fix this (I'm very naive where it comes to C++). Can someone familiar 
with the code give me some pointers?
2. Fix startkde: in that other case, how can we reliably get the XDG local 
dir (which is ~/.local in Linux by default but I would not assume that)?

[1] https://bugs.kde.org/show_bug.cgi?id=333793

P.S.: I have also a branch with the port of kf5-config to QCommandLineParser 
and QStandardDirs where possible, I'll try to submit it for review ASAP.

-- 
Luca Beltrame - KDE Forums team
KDE Science supporter
GPG key ID: 6E1A4E79