--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bash-completion.sh	Thu Jul 22 20:19:00 2021 +0200
@@ -0,0 +1,69 @@
+# Relational pipes
+# Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, version 3 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+_relpipe_in_asn1_completion() {
+	local w0 w1 w2 w3
+
+	COMPREPLY=()
+	w0=${COMP_WORDS[COMP_CWORD]}
+	w1=${COMP_WORDS[COMP_CWORD-1]}
+	w2=${COMP_WORDS[COMP_CWORD-2]}
+	w3=${COMP_WORDS[COMP_CWORD-3]}
+
+	BOOLEAN_VALUES=(
+		"true"
+		"false"
+	)
+
+	# TODO: introspection: after moving to alt2xml the available options and their values should be provided by the parser
+
+	PARSER_OPTIONS=(
+		"encoding"
+		"parse-encapsulated"
+		"tree-style"
+		"tree-with-namespaces"
+		"root-name"
+	);
+
+	ENCODINGS=(
+		"BER"
+		"DER"
+		"CER"
+		"PER"
+		"XER"
+		"ASN.1"
+	);
+
+	MODES=(
+		"relpipe"
+		"freeform"
+	);
+
+	if   [[ "$w1" == "--relation"                      && "x$w0" == "x" ]];    then COMPREPLY=("''")
+	elif [[ "$w1" == "--mode"                                           ]];    then COMPREPLY=($(compgen -W "${MODES[*]}" -- "$w0"))
+	elif [[ "$w1" == "--parser-option"                                  ]];    then COMPREPLY=($(compgen -W "${PARSER_OPTIONS[*]}" -- "$w0"))
+	elif [[ "$w2" == "--parser-option" && "$w1" == "encoding"                                 ]];    then COMPREPLY=($(compgen -W "${ENCODINGS[*]}" -- "$w0"))
+	elif [[ "$w2" == "--parser-option" && "$w1" == "parse-encapsulated"                       ]];    then COMPREPLY=($(compgen -W "${BOOLEAN_VALUES[*]}" -- "$w0"))
+	else
+		OPTIONS=(
+			"--relation"
+			"--mode"
+			"--parser-option"
+		)
+		COMPREPLY=($(compgen -W "${OPTIONS[*]}" -- "$w0"))
+	fi
+}
+
+complete -F _relpipe_in_asn1_completion relpipe-in-asn1