make single installable argument optional, allowing nix log
#2340
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Previously in Nix commands like log always required an argument. This was confusing, because it is often used in combination with
nix build
, but does not expect the same arguments:A workaround was to use
""
as argument, since that same value is used by default for the build command:This is because
nix log
has the following usage:whereas
nix build
has:This PR will make the INSTALLABLE of
nix log
,nix eval
andnix edit
optional. That makes the usage as follows:Solves #2332 #2066
Partially solves #2078