lesskey files can't include LESSHISTFILE

[timhillgit]

In version v678 of less if a lesskey file sets LESSHISTFILE then the file can't be parsed. This causes all of the environment variables, even those earlier in the file, to not be set.

Reproducing the bug

I created ~/.config/lesskey with the following content:

#env
LESS=-F
LESSHISTFILE=-

I then ran less ~/.config/lesskey. I would expect that less would immediately exit after displaying the contents of the file, but it does not. If I instead use the following lesskey file:

#env
LESS=-F

less exits as expected.

[gwsw]

Fixed in 04ab72c.

The problem appears when one variable name is a prefix of another, and the longer name appears after the shorter one in the lesskey file. Until the fix is released, you can work around the problem in less-678 by reversing the order of the LESS and LESSHISTFILE lines so that the shorter one appears after the longer one.

[timhillgit]

Thank you for your quick solution and for the workaround!