add bash-it

dot_bash_it/completion/available/system.completion.bash

@@ -0,0 +1,52 @@
+# shellcheck shell=bash
+#
+# Loads the system's Bash completion modules.
+# If Homebrew is installed (OS X), it's Bash completion modules are loaded.
+
+# Load before other completions
+# BASH_IT_LOAD_PRIORITY: 325
+
+# Bash-completion is too large and complex to expect to handle unbound variables throughout the whole codebase.
+if shopt -qo nounset; then
+	__bash_it_restore_nounset=true
+	shopt -uo nounset
+else
+	__bash_it_restore_nounset=false
+fi
+
+# shellcheck disable=SC1090 disable=SC1091
+if [[ -r "${BASH_COMPLETION:-}" ]]; then
+	source "${BASH_COMPLETION}"
+elif [[ -r /etc/bash_completion ]]; then
+	source /etc/bash_completion
+# Some distribution makes use of a profile.d script to import completion.
+elif [[ -r /etc/profile.d/bash_completion.sh ]]; then
+	source /etc/profile.d/bash_completion.sh
+elif _bash_it_homebrew_check; then
+	: "${BASH_COMPLETION_COMPAT_DIR:=${BASH_IT_HOMEBREW_PREFIX}/etc/bash_completion.d}"
+	case "${BASH_VERSION}" in
+		1* | 2* | 3.0* | 3.1*)
+			_log_warning "Cannot load completion due to version of shell. Are you using Bash 3.2+?"
+			;;
+		3.2* | 4.0* | 4.1*)
+			# Import version 1.x of bash-completion, if installed.
+			BASH_COMPLETION="${BASH_IT_HOMEBREW_PREFIX}/opt/bash-completion@1/etc/bash_completion"
+			if [[ -r "$BASH_COMPLETION" ]]; then
+				source "$BASH_COMPLETION"
+			else
+				unset BASH_COMPLETION
+			fi
+			;;
+		4.2* | 5* | *)
+			# homebrew/versions/bash-completion2 (required for projects.completion.bash) is installed to this path
+			if [[ -r "${BASH_IT_HOMEBREW_PREFIX}/opt/bash-completion@2/etc/profile.d/bash_completion.sh" ]]; then
+				source "${BASH_IT_HOMEBREW_PREFIX}/opt/bash-completion@2/etc/profile.d/bash_completion.sh"
+			fi
+			;;
+	esac
+fi
+
+if [[ ${__bash_it_restore_nounset:-false} == "true" ]]; then
+	shopt -so nounset
+fi
+unset __bash_it_restore_nounset