If a command depends on a certain program to be installed on your
system, but it’s not, that command is broken. Whicher makes it easy
to keep track of the programs that your config depends on.
Example:
(setq mu4e-get-mail-command (whicher "mbsync -a"))
(setq mu4e-html2text-command (whicher "w3m -T text/html"))Now, whicher knows that your config depends on mbsync and w3m.
This comes at almost no performance penalty, since executable-find isn’t called by
whicher.
Use whicher-report to see the state of your dependencies. The output is similar to the
output of which(1), hence the name.