Enable tilde expansion in .tigrc "source" commands

[wjv]

The examples listed in the SOURCE COMMAND section of tigrc(5) seem to indicate that one can rely on tilde expansion to be applied to the paths of configuration files includes via the "source" command. However, it doesn't seem as if this had ever been implemented.

I've tried to add this functionality here, and it seems to work fine in my tests.

(Thanks to @antoinevg for pointing me in the right direction.)

[jonas]

Thanks for the patch @wjv.

I am wondering if either the existence of <wordexp.h> needs to be checked by the configure script or whether we can simply get away with just replace any leading ~/ with $HOME/. I know this is less standards-like, but at least it is guaranteed to work.

Also, ideally the tilde expansion should be done in io_open() so that other parts of tig can benefit from this, such as the expansion of "~/.tigrc", which is currently done manually.

tig/tig.c

Line 1827 in d2058bf

if (!home || !string_format(buf, "%s/.tigrc", home))

.

[jonas]

I went ahead and patched this to use the tilde/$HOME expansion already used internally in tig.