Add support to zsh's HISTORY_IGNORE parameter.

[ericbn]

Also set missing local and global variables, so no warning is emitted when WARN_CREATE_GLOBAL is set.

[ericbn]

Maybe _BORING_COMMANDS could be deprecated in favor of other zsh options:

• The "^ " regexp can be replaced by HIST_IGNORE_SPACE, which is BTW not set by default in zsh. Code example:

  if [[ -o histignorespace && ${cmd} == ' '* ]]; then
      return 0
  fi

• The "^histdb" regexp could be replaced by HIST_NO_STORE, which is also not set by default in zsh. It's not exactly the same (as HIST_NO_STORE will actually ignore history commands), so maybe not a good idea. Code example:

  if [[ -o histnostore && ${cmd} == histdb* ]]; then
      return 0
  fi

• The remaining "^ls$" "^cd$" "^top$" "^htop$" regexps can be replaced by setting HISTORY_IGNORE=(ls|cd|top|htop), given the changes in this PR. Or "^histdb" can be included here too, with HISTORY_IGNORE=(ls|cd|histdb*|top|htop)

The pro of using the same parameters as zsh is that both zsh's history and histdb's history will be configured the same way.

[ericbn]

Giving it a second thought on HIST_NO_STORE, to be compatible with what zsh actually does, it might be better to do:

if [[ -o histnostore && ${cmd} == (builtin |)(history( *|)|r( *|)|fc -l*) ]]; then
    return 0
fi

[larkery]

I only just saw this and I like it. I will fix it up and merge when I have time, thank you.

[larkery]

Slow turnaround I know but you get what you pay for in opensource software right.