Now we handle some things more explicitly and in the process get rid of
the blanket rescue on the mktemp block, which is something of an
antipattern.
By unloading the class *after* determining the version, we avoid the
case where the class had previously been unloaded but Formula.factory
failed, and trying to unload the nonexistent class results in a
NameError. Doing it this way, we avoid having to rescue NameError and
thereby avoid hiding other cases where it may occur.
We also rescue TypeError which gets us past a few more bad formula in
the history in some instances.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
This is silly, but I am no Rubyist and I don't have time to
figure out why Formula.factory(foo).url works as expected but
Formula.factory(foo).version does not.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
This will be useful for shell tab completion when something like `brew
install <formula> --version <version>` is implemented.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Rather than regex the output of `git show <rev>:<path>`, we write the
output of `git cat-file blog <rev>:<path>` to a temporary file, and then
operate on it just as we would a normal formula.
I haven't observed any speed difference. `git cat-file blob` is faster
than `git show`, but the "slow part" is still the git-rev-list
invocation. But really it's pretty fast overall.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
The output happens as it is determined, rather than all at once, which is preferable for CLI commands. This meant I had to hard-code the left-justification.
The pre-amble warning is removed. Instead the command outputs the git checkout command for each she that you can type to get that old formula.
I decided that reseting the one file will work 99% of the time and that it is too risky to reset the whole repo, this will roll-back bug fixes. Instead we should add functionality to compat/ in order to support old formula as required. Sometimes deps may have to be rolled-back too, but the user will have to figure this out on an ad-hoc basis. We are assuming a failure sophisticated user anyway, one who would like to get old versions of stuff.
I moved most of the functions into Formula since IMO this makes more conceptual sense.
I made the she get abbreviated by git (using --abbrev-commit) itself so it as short as can be.
