add bash-it

dot_bash_it/completion/available/brew.completion.bash

@@ -0,0 +1,30 @@
+# shellcheck shell=bash
+cite "about-completion"
+about-completion "brew completion"
+
+# Load late to make sure `system` completion loads first
+# BASH_IT_LOAD_PRIORITY: 375
+
+if [[ "$OSTYPE" != 'darwin'* ]]; then
+	_log_warning "unsupported operating system - only 'Darwin' is supported"
+	return 0
+fi
+
+# Make sure brew is installed
+_bash_it_homebrew_check || return 0
+
+if [[ -r "$BASH_IT_HOMEBREW_PREFIX/etc/bash_completion.d/brew" ]]; then
+	# shellcheck disable=1090
+	source "$BASH_IT_HOMEBREW_PREFIX/etc/bash_completion.d/brew"
+
+elif [[ -r "$BASH_IT_HOMEBREW_PREFIX/Library/Contributions/brew_bash_completion.sh" ]]; then
+	# shellcheck disable=1090
+	source "$BASH_IT_HOMEBREW_PREFIX/Library/Contributions/brew_bash_completion.sh"
+
+elif [[ -f "$BASH_IT_HOMEBREW_PREFIX/completions/bash/brew" ]]; then
+	# For the git-clone based installation, see here for more info:
+	# https://github.com/Bash-it/bash-it/issues/1458
+	# https://docs.brew.sh/Shell-Completion
+	# shellcheck disable=1090
+	source "$BASH_IT_HOMEBREW_PREFIX/completions/bash/brew"
+fi