Remove "*instal" aliases from bash completion

[rhwood]

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Remove all command aliases ending in "instal" (single letter L) from the bash completion. This has the practical effect of removing the aliases "instal" and "uninstal" from bash completion, allowing "install" and "uninstall" to be auto completed once the first three characters of each "ins" or "uni" are typed in.

This makes bash completion for "uninstall" complete with a following space on the first tab instead of offering two different versions of the same command.

Addresses #3051

[MikeMcQuaid]

# Do not auto-complete "instal" or "uninstal" abbreviations for "*install" commands. I think is a little easier to parse.

[MikeMcQuaid]

Any way we can do this without spawning a new grep process? No worries if not, just wanted to check.

[rhwood]

The only way I could get it to work without calling grep was:

local cmds=$'\n'"$(brew commands --quiet --include-aliases)"
cmds="${cmds/$'\n'uninstal$'\n'/$'\n'}"
__brewcomp "${cmds/$'\n'instal$'\n'/$'\n'}"

I could not figure out a regex pattern that would work to capture both instal and uninstal in a single line, and went for the one liner (which I also find more readable).

[MikeMcQuaid]

@rhwood Thanks for the PR! FYI for future if you're happy to open a PR for an issue you don't need to create an issue first.

[MikeMcQuaid]

Thanks for your contribution to Homebrew, @rhwood! Without people like you submitting PRs we couldn't run this project. You rock!