D31463.diff
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	diff --git a/Mk/Uses/completions.mk b/Mk/Uses/completions.mk
	new file mode 100644
	--- /dev/null
	+++ b/Mk/Uses/completions.mk
	@@ -0,0 +1,36 @@
	+# Helper for programmable shell completions.
	+#
	+# Feature: completions
	+# Usage: USES=completions OR USES=completions:ARGS
	+# Valid ARGS: (none), env
	+#
	+# none Create the preliminary shell completion directories
	+# and expose the port variables.
	+# env Expose the port variables only.
	+#
	+# Variables, which can be used by the port:
	+#
	+# BASH_COMPDIR Path to the bash completion directory.
	+# FISH_COMPDIR Path to the fish completion directory.
	+# ZSH_COMPDIR Path to the zsh completion directory.
	+#
	+# MAINTAINER: ports@FreeBSD.org
	+
	+.if !defined(_INCLUDE_USES_COMPLETIONS_MK)
	+_INCLUDE_USES_COMPLETIONS_MK= yes
	+
	+_valid_ARGS= env
	+. for _arg in ${completions_ARGS}
	+. if !${_valid_ARGS:M${_arg}}
	+IGNORE= USES=completions: invalid argument: ${_arg}
	+. endif
	+. endfor
	+
	+BASH_COMPDIR?= ${PREFIX}/share/bash-completion/completions
	+FISH_COMPDIR?= ${PREFIX}/share/fish/vendor_completions.d
	+ZSH_COMPDIR?= ${PREFIX}/share/zsh/site-functions
	+
	+. for shell in BASH FISH ZSH
	+PLIST_SUB+= ${shell}_COMPDIR=${${shell}_COMPDIR:S,^${PREFIX}/,,}
	+. endfor
	+.endif